HyperCrash Introduction

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HyperWorks is a division of

A Platform for InnovationTM

HyperCrash Introduction

Pre-Processing for RADIOSS Crash Analysis


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Altair Engineering Contact Information

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2009 Altair Engineering, Inc. All rights reserved. No part of this publication may be reproduced, transmitted,transcribed, stored in a retrieval system, or translated to another language without the written permission of AltairEngineering, Inc. To obtain this permission, write to the attention Altair Engineering legal department at: 1820 E.Big Beaver, Troy, Michigan, USA, or call +1-248-614-2400.

Trademark and Registered Trademark Acknowledgments

Listed below are Altair

HyperWorks

applications. Copyright

Altair Engineering Inc., All Rights Reserved for:

HyperMesh

1990-2009; HyperView

1999-2009; OptiStruct

1996-2009; RADIOSS

1986-2009; HyperCrash2001-2009; HyperStudy

1999-2009; HyperGraph

1995-2009; MotionView

1993-2009; MotionSolve

2002-

2009; TextView 1996-2009; MediaView 1999-2009; HyperForm

1998-2009; HyperXtrude

1999-2009;HyperView Player

2001-2009; Process Manager 2003-2009; Data Manager 2005-2009; Assembler

2005-2009; FEModel 2004-2009; BatchMesher 2003-2009; Templex 1990-2009; ManufacturingSolutions 2005-2009; HyperDieDynamics 2007-2009; HyperMath 2007-2009; ScriptView 2007-2009.

In addition to HyperWorks trademarks noted above, GridWorks, PBS Gridworks, PBS Professional,PBS and Portable Batch System are trademarks of ALTAIR ENGINEERING INC., as is patent # 6,859,792.All are protected under U.S. and international laws and treaties. All other marks are the property of theirrespective owners.

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Table of Contents

HyperCrash IntroductionPre-processing for RADIOSS Crash Analysis

Chapter 1: Getting Started ..................................................................................... 1

Section 1: Windows Description........................................................................................ 1

Section 2: Mouse Modes...................................................................................................2

Section 3: Keyboard Options ............................................................................................3

Section 4: Display Toolbar ................................................................................................4

Section 5: Info Toolbar ......................................................................................................8

Section 6: Tree Window.................................................................................................... 9Section 7: Help In HyperCrash..........................................................................................9

Section 8: Description of the Example ..............................................................................9

Chapter 2: Introduction ........................................................................................ 11

Section 1: Open HyperCrash and Read the Input File....................................................11

Section 2: Tree Structure Hierarchy................................................................................14

Section 3: Delete a Part .................................................................................................. 18

Section 4: Mesh Class Definition ....................................................................................18

Chapter 3: Material and Property Al location ...................................................... 21

Section 1: Create Material...............................................................................................21

Section 2: Modify Materials .............................................................................................23

Section 3: Material Allocation..........................................................................................25

Section 4: Create Properties ...........................................................................................27

Section 5: Modify Properties ...........................................................................................29

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Section 6: Property Allocation......................................................................................... 30

Section 7: Mat & Prop Allocation from the Tree Window ................................................ 32

Chapter 4: Element Creation/Modif ication ..........................................................39

Section 1: Create New Elements....................................................................................39

Section 2: Modify Elements............................................................................................. 42

Section 3: Split a Part into Two Parts.............................................................................. 44

Section 4: Create a Reinforcement.................................................................................45

Section 5: Create a Symmetry of a Part..........................................................................47

Chapter 5: Connections ........................................................................................49

Section 1: Read a Spotfile file (MWF Format)................................................................. 49

Section 2: Display Spotweld Options ..............................................................................52

Section 3: Spotweld Checking ........................................................................................ 54

Section 4: Create New Spotwelds................................................................................... 57

Section 5: Export a New Spotweld File ........................................................................... 58

Section 6: Bolt Creation .................................................................................................. 59

Section 7: Tied Interface Creation................................................................................... 63

Section 8: Check the Model Connections....................................................................... 65

Chapter 6: Merge and Connect the Subsystems ................................................67

Section 1: Read the Engine File...................................................................................... 67

Section 2: Connect the Engine and the Transmission .................................................... 70

Section 3: Check the Mass Balance of the Model...........................................................74

Section 4: Merge the Barrier ........................................................................................... 77

Section 5: Move the Barrier to its Correct Location......................................................... 78

Chapter 7: RADIOSS Features .............................................................................81

Section 1: Create a Boundary Condition.........................................................................81

Section 2: Create an Interface to Handle the Contacts for the Car.................................83

Section 3: Create an Interface to Handle the Contects Between the Car and Barrier .... 85

Section 4: Create an Initial Velocity to Apply to the Entire Car .......................................86

Section 5: Create an Added Mass on the Right Door .....................................................88

Section 6: Create a Rigid Wall to Model the Ground ......................................................91

Chapter 8: Quality Check......................................................................................93

Section 1: Check the Intersections and Penetrations in the Model................................. 93

Section 2: Check the Thicknesses..................................................................................87

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Section 3: Check the Model with ModelChecker.............................................................87

Chapter 9: Replace Function ............................................................................. 103

Chapter 10: Time History Selection................................................................... 107

Section 1: TH Node Selection .......................................................................................107

Section 2: TH Section Creation..................................................................................... 108

Section 3: TH Part Creation ..........................................................................................110

Chapter 11: Clean the Model.............................................................................. 113

Chapter 12: Final Steps ...................................................................................... 115

Section 1: Export the Model ..........................................................................................115

Section 2: Run the Starter for this Model ......................................................................118

Chapter 13: Dummy Posi tioner.......................................................................... 121

Section 1: Load the Dummy..........................................................................................121

Section 2: Position the Dummy..................................................................................... 124

Chapter 14: Seatbelt Generator ......................................................................... 127

Appendix 1: The M00 File, a HyperCrash f ile ................................................... 131

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Chapter 1: Getting Started

Chapter 1

Getting Started

Section 1: Windows Description

The HyperCrash environment window is composed of the following menus and windows:

The Notebook Window, located on the left side of the HyperCrash environmentwindow

The Graphic Window, located in the center of the HyperCrash environment window

The Message Window, located below the Notebook Window

The Pull-down Menu Bar, located across the top of the HyperCrash environmentwindow

The Display Toolbar, located on the right side of the environment window

The Info Toolbar, located on the lower right corner

The Dialog Menu Bar, located at the bottom of the HyperCrash environment window

The Tree Toolbarlocated at the top of the Tree Window.

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Section 2: Mouse ModesTwo mouse settings are now available: the classic HyperCrash mode and a new one thatfollows the HyperMesh\HyperWorks approach. You can now switch from one mode toanother while in an active session (select the Options menu and activate or deactivate UseClassic Mouse Setting).

Classic HyperCrash Mouse Mode

Task DescriptionRotations Middle + right mouse button:

Press the C key and pick a node with the left mouse button to changethe center of rotation.

Press the CTRL and C keys to switch off the automatic center ofrotation.

Press the SHIFT and C keys to switch on the automatic center ofrotation.

Translations Right mouse button:Zoom Zoom in: middle mouse button and slide up:

Zoom out: middle mouse button and slide down.

Zoom box in: press the Z key and drag a box in the graphic windowwith the left mouse button:

Zoom box out: press the SHIFT and Z keys and drag a box in the

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graphic window with the left mouse button.

Zoom in: press the key.

Zoom out: press the key.HyperMesh/HyperWorks Mouse ModeTask DescriptionRotations Press the CTRL key + left mouse button and move the mouse around.

The model rotates with the movement of the mouse. Release the left mouse button and press it again to rotate the model

in a different direction.

Press the CTRL key and quick-click the left mouse button anywhereon the model to pick a new center of rotation. Press the CTRL key +left mouse button to rotate the model on this new center of rotation.

Translations Press the CTRL key + right mouse button and move the mousearound. The model is panned (translated) according to the mousemovement.

Zoom Press the CTRL key + middle mouse button, move the mouse around,and then release the mouse button.

A white box is drawn according to the area of the mouse movement.When the mouse button is released, HyperCrash zooms in on theportion of the model where the box was drawn.

Press the CTRL key + quick-click the middle mouse button. Themodel is fitted to the graphic window.

Press the CTRL key and spin the mouse wheel. The model zooms inor out depending on which direction you spin the mouse wheel.

Section 3: Keyboard Options F1, F2, F3 and F4: in picking mode, when more than one element is selected, F1

and F2 allow you to switch from one element to another. Then, F3 allows you to

validate or F4 allows you to cancel the choice.

F5: Display the rigid walls.

F6: Display the rigid bodies.

F7: Display the initial velocities.

F8: Display the free nodes (not belonging to any element).

F9> F12: Standard views (clicking the same key a second time will reverse theview).

SHIFT F5: Display the added masses.

SHIFT F6: Display the boundary conditions. SHIFT F7: Display the contact interfaces.

SHIFT F8: Clear all displayed options.

SHIFT C: Switch on the automatic center of rotation.

W: Set the background color to white.

B: Set the background color to black.




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P: Switch between perspective view and orthogonal view.

Z: Zoom in (press Z and drag a box with the left mouse button in the GraphicWindow).

SHIFT Z: Zoom out box.

ENTER or Y key: Yes (validate or accept). ESC key: Cancel or dismiss.

Section 4: Display ToolbarUsing the view mode icons of the Display Toolbar, you can access different views of yourmodel.

When you are loading your model, all the parts are visible in the Graphic Window, calledthe Front Screen. To get a better view of the parts you are working on or to help you gain abetter understanding of the model, you can remove the selected parts from the FrontScreen. The unselected parts are visible in the Graphic Window called the Reverse

Screen. This is the HyperCrash Show / No Show system.

Refresh graphic window Toggle Reverse Display

Center the model and fit it to the screen Display all parts in a model

Isolate by element type (shells, trusses, springs,

beams, or solids) View simplification

Mask by element type Display by element type

Display / hide details Control transparency level

Display / hide free nodes

Display solid elements / display external solid

surfaces

Display graphic object Mask all graphic objects

Control display elements Display by tree selection

Unmask selected partsDisplay parts in node proximity

Display connected elements Display parts connected to selected part

Mask selected parts Mask boxed parts

Isolate selected parts Isolate boxed parts

Views Display mode




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Note: Some good feature for displaying and undisplaying parts:

Ctrl + Shift and right mouse selection will mask a Part.

Ctrl + Shift and left mouse selection will unmask a Part

Shift and hold the right mouse button and draw a window will mask all the parts within thewindow. Repeating the same process with the left mouse button will unmask the partswithin the window.

Model Browser: underModel pull down menu, click Model Browser:

In the Model Browserwindow, you can turn On/Off by checking/uncheking

The square box left to the Part or Assembly

You can Display all by right mouse clicking on the Root Model and Click on Show orHide




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Cross Reference in Model Browser:




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Right mouse click on a Part or Assembly and click Cross Reference:

Creating Inc lude File under Model Browser:




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Click on Model View switch to Include-

Submodel and ok. Anywhere on window, right mouse click . You then pickanything youll like put in Include file with the middle mouse button drag it to the include file:

Section 5: Info ToolbarThe Info toolbarcan be used to find information about the mesh:

Show node info Node info by ID

Show element info Element info by ID

Show object info Object info by ID

Find the distance between two nodes Find the angle between three nodes




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Section 6: Tree WindowUse the Tree to navigate in your model hierarchy. Clicking the right mouse button (in theNotebook window) brings up a pop-up menu.

Icons in the Tree Window and their meanings:

Assembly (subset) Part Subpart

Here is the current state of the Tree toolbar:

Expand > Collapse All Add to ViewExpand/collapse tree Add the tree selection to the display

Select > Unselect all Add to View and ResizeSelect / unselect all items Add tree selection to display and resize

to fit

Invert Selection Remove from View

Invert the selection Mask tree selection from display

Search View Only

Open the search panel to search for anAssembly, a Part or a Subpart

Isolate tree selections

Highlight

Transparency for tree selection

Section 7: Help in HyperCrashAt any time, you can consult the HyperCrash online help. From the Pull-down Menu Bar,click Help and choose HyperCrash to open the online help in your web browser.

Note: The HyperCrash help manual opens with Netscape (Mozilla under Linux platform).

Section 8: Description of the Example

The purpose of this example is to build an offset frontal crash model using HyperCrash




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HyperCrash Introduct ion 10 HyperWorks 10.0


Initial Vel

35

Units: N, mm, s, Ton, Mpa


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Chapter 2: Introduction

Chapter 2

Introduction

Section 1: Open HyperCrash and Read the Input File

When you first start HyperCrash, the startup screen will appear (see following image):

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Chose the User profi le, Choose whether you wish to run HyperCrash in the New or Classicmode, and choose the units environment you want to run the session in (for this tutorial,choose the Units System: N mm s T). Click on Run .

Step 1: In the HyperCrash environment window, identify all the menus, windows, andtoolbars described in Chapter 1.

Step 2: Load the model called CAR35MPH_0000. r ad1. In the Menu Bar, click File > Import > RADIOSS file (see following image).




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2. In the Radioss Input window, select the file CAR35MPH_0000. r ad and click OK (seefollowing image).

Step 3: Use the mouse and keyboard (CTRL) options to move the model.

Zoom in and out Translation Rotation




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Section 2: Tree Structure / HierarchyStep 1: Create a new assembly called LEFT DOOR and put the entire l ef t door * parts in

it.

1. Click with the left mouse button in the Tree window (anywhere among assemblies).

2. Click the right mouse button and select New Assembly (see following image).

3. In the new window, enterLEFT DOOR and click Ok, as in the following image.

4. With the left mouse button, highlight the entire l ef t door * parts.




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Note: You may use the CTRL or SHIFT or CTRL+SHIFT keys to make the selection inthe Tree easier.

5. Use the middle mouse button to drag the selected partsin the LEFT DOOR assembly.

Step 2: Create a new assembly called RI GHT DOOR and drag the entire r i ght door * parts in it.

1. Click with the left mouse button in the Tree Window.

2. Click the right mouse button and select New Assembly.




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3. In the new window, enterRI GHT DOOR and click Ok.

4. With the left mouse button, highlight the entire r i ght door * parts.

5. Use the middle mouse button to drag the selected parts in the RI GHT DOORassembly.

Step 3: Create a new assembly called DOORS and drag the two assemblies LEFT DOOR

and RI GHT DOOR into it.1. Click with the left mouse button in the Tree Window.

2. Click the right mouse button and select New Assembly.

3. In the new sub-window, enterDOORS and click Ok.

4. With the left mouse button, highlight the assemblies LEFT DOOR and RI GHT DOOR.

5. Use the middle mouse button to drag the selected parts into the DOORS assembly.

Step 4: Export the assembly called DOORS in RADIOSS V10.0 Block format.

1. In the Tree Window, highlight the assembly, DOORS.

You can view your selection by clicking the icon.

2. Click the right mouse button and select Export Selection, as shown in the followingimage).




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3. In the Export Selection window:

Select Block 10.0 for the file format (default).

Select the toggle, Save Only Geometry and click Ok.




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In the Write Block Format 100 RADIOSS File pop-up window, enterDOORS andclick Ok.

In the HEADER of RADIOSS pop-up window, click the Save Model button. Thesubsystem is exported.

Click Close in the window called Write Engine file, V100.

Section 3: Delete a PartStep 1: In the Tree Window, highlight the part called REAR_TI REin the Wheel s assembly.

Step 2: Click the View Only button ( ).

Step 3: In the Tree Window, click the right mouse button and select Delete.

Step 4: AnswerYes to the question in HyperCrash pop_up window (or press the ENTERkey) to confirm deletion of the part.

Section 4: Mesh Class DefinitionFive mesh classes are available in HyperCrash. From Class 1, defining very important parts(fine mesh, severe criteria), to Class 4, defining parts of low influence on the result precision(coarse mesh). If no class is defined for a part, HyperCrash automatically defines this part

as Class s (s stands forstandard).

Step 1: In the Tree Window, highlight the subsets Fr ames and Front f ace (in the

assembly Body i n Whi t e) and click the View only icon ( ).

Step 2: In the Tree Window, click the right mouse button and select Class Selection,

then, Class 1 (see following image).




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Step 3: Repeat step1 and step2 to define the assemblies Front suspensi on, Wheel s,and Subf r ame as Class 2.

Step 4: Repeat step1 and step2 to define the assemblies Body (in the assembly Body i nWhi t e) and DOORS as Class 3.

Step 5: Repeat step1 and step2 to define the assemblies Rear (in the assembly Body i nWhi t e), Rear suspensi on, and ot her s as Class 4.

Step 6: Click Display All ( ) and Fit Model ( ) buttons to display the whole model inthe Graphic Window.

Step 7: Make sure to save the Model at the end of each chapter:

Click on f ile Export ___> Radioss __> enter file Name: CHPT2




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Chapter 3: Material and Property Allocation

Chapter 3

Material and Property Allocation

Following the steps in Chapter 2, Section 1, load the model called CHPT2_0000.rad.

Section 1: Create MaterialStep 1: From the Pull-down Menu Bar, click Model, then Material.

Step 2: In the Material panel, click the RADIOSS menu, choose Elasto-Plastic, thenselect Johnson Cook (2).

Step 3: In the fields in the lower section of the Material panel, enter the followingparameters:

Title:high_steel




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Initial Density: 7.9e-09

Youngs Modulus: 210000

Poissons Ratio: 0.3

Yeild Stress:250

Hardening Parameter:500

Hardening Exponent:0.5

Step 4: Click See Curve ( ) to plot the true stress v. true strain curve.

Step 5: Close the plot.

Step 6: Click the Save in database button ( ).

Step 7: In the Save in DataBase window, delete the path to the global database, enter the

path to your local data base or working directory then enterhigh_steel, as

name.

Note: By default, HyperCrash points to the global database. You do not have permissionto write here but you can create your own local database.




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Path to yourLocal database

Step 8: Click OK to save your material in your local database.

Step 9: Click Cancel and Close to close the Material menu.

Section 2: Modify Materials

Step 1: From the Pull-down MenuBar, click Model and choose Material.

Step 2: switch to the Tree Window, highlight the part ENGINE_MOUNT1 (in the assembly

Body in White Frames).




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Step 3: Click on Isolate Tree Selection ( ).

Step 4: Go back to the Material panel and click on pick part to see and select

corresponding item in list ( ), select the display item then Yes and click on See

Selected button ( ).

Step 5: Click the See Curve icon ( ) on the lower part of the panel. The Plot Windowopens. Click Close to close the curve after reviewing it.

Step 6: Modify the following parameters:

Title: low_yield_steel

Yield Stress: 165

Hardening Exponent: 0.5




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Step 7: Click SeeCurve ( ) to plot the new stress v. strain curve. Click Close to closethe curve after reviewing it.

Step 8: In the Material Properties panel, click Save.

Step 9: Click Close to close the Material panel.

Section 3: Material AllocationNote: You can allocate materials from the global database or local database, or you can

even pick existing materials from within the model.

Step 1: From the Pull-down MenuBar, click Model and choose Material.

Step 2: In the Material panel, select the Switch between Model & DB icon ( ). Then

click the Go to Home Databasedirectory icon ( ).

Step 3: Allocation from the Global Database.

1. Select STEEL material and click the See Selected icon ( ) (see following image).

2. The material parameters appear.




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3. Go to the Tree panel, highlight the part CBN-SEAT-REINF-FT(in the assembly Body

in White Frames) and click the Isolate Tree Selections icon ( ).

4. Go back to the Material panel and click the Selected parts of tree icon ( ).

5. Click Save to allocate the material.Step 4: Allocation from the Local Database.

1. In the Modify panel, select Switch between Model & DB( ) twice. Then click the

Change the database directo ry icon ( ), enter the path to your local database orworking directory and click the OK button.

2. Highlight high_steel_0000.rad and click the See selected icon ( ) to see the

material parameters.

3. Go to the Tree panel, highlight the part RAILS_R (in the assembly Body in White

Frames), and click the Isolate Tree Selections icon ( ).

4. Go back to the Materialpanel and click the Selected parts of tree icon ( ).

5. Click Save to allocate the material and click Close to close the Materialpanel.

Step 5: Allocation from the Model.

1. Go to the Materialpanel, select rubber material and click the See selected icon ( ).

Only the parts assigned to the material rubber are displayed in the Graphic Window.




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2. In the Tree Window, highlight the parts TIRE-FT-L and TIRE-FT-R (in the assembly

Wheelsfront_wheel) and click the Isolate Tree Selections button ( ).

3. Go back to the Materialpanel, click the Include picked parts button ( ), and pick thetires from the Graphic Window.

4. After selecting both tires, confirm the selection by clicking Yes in the Dialog Menu Bar(lower-right corner of the HyperCrash window).

5. Click Save to allocate the material (confirm in the Dialog Menu Bar) and click Close toclose the Materialpanel.

Section 4: Create PropertiesStep 1: From the Pull-down MenuBar, click Model, and choose Property.




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Step 2: In the Property panel, click the RADIOSS menu, choose Surface, and select Shell(1).

Step 3: Enter the following parameters as in the following image:

Title:shell_1.1mm

Number of Integration Points:5

Thickness: 1.1

Step 4: Click the Save in database icon ( ).

Step 5: In the Save in data base sub-window, navigate to your local database

Note: By default, HyperCrash points to the global database. You do not have permissionto write here, but you can create your own local database.




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Step 6: Click OK to save your material in your local database (see following image).

Step 7: Click Cancel and then click Close to close the Properties panel.

Section 5: Modify PropertiesStep 1: From the Pull-down MenuBar, click Model and choose Property.

Step 2: In the Tree Window, highlight the part ENGINE_MOUNT1 (in the assembly Body

in White Frames) and click the Isolate Tree Selections icon ( ).

.




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Step 3: Click on Isolate Tree Selection ( ).

Step 4: Go back to the Property panel and click on pick part to see and select

corresponding item in list ( ), select the display item then Yes and click on See

Selected button ( ).Step 5: The property parameters appear in the panel: Modify the following parameters:

Title:Engine_Mount_2.0mm

Nb Integration Points:5

Thickness:2.0

Step 6: Click Save and Close to close the Property panel.

Section 6: Property AllocationNote: You can allocate properties from the global database or local database, or you can

pick existing properties from within the model.

Step 1: From the Pull-down MenuBar, click Model and choose Property.

Step 2: In the Property panel, select the Switch between Model & DB icon ( ). Then,

click the Go to Home Databasedirectory icon ( ).

Step 3: Allocation from the Global Database.

1. Select SOLID GENERAL and click the See selected icon ( ).

2. The property parameters appear as follows:




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3. In the Tree Window, highlight the part ENG-MNT-BUSH-L (in the assembly Body in

White Frames) and click the Isolate Tree Selections icon ( ).

4. Go back to the Property panel and click the Selected parts of tree icon ( ).

5. Click Save to allocate the property.

Step 4: Allocation from the Local Database

1. Go to Property panel and select the Switch between Model & DB icon ( ). Then,

click the Foldericon ( ), enter the path to your local database or working directoryand click the OK button.

2. Select shell_1.1mm_0000 as in the following image and click the See Selected icon

( ).

The property parameters appear.




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3. In the Tree Window, highlight the part LEFT RAIL 2 (in the assembly Body in

White Frames) and click the Isolate Tree Selections icon ( ).

4. Go back to the Property panel and click the Selected parts of tree icon ( ).

5. Click Save to allocate the property.

Step 5: Allocation from the Model

1. In the Property panel click the Switch between Model & DB icon ( ) to switch to the

model database. Then, select Engine_Mount_2.0mm property number 21 as in the

following image and click the See selected icon ( ).

2. In the Tree Window, highlight the parts TIRE-FRT-L and TIRE-FRT-R (in the

assembly Wheels) and click the Isolate Tree Selections button ( ).

Step 6: Go back to the Property sub-panel, click the Include picked parts button ( ),and pick the tires in the Graphic Window.

Step 7: Confirm the selection by clicking Yes in the Dialog Menu Bar(lower-right corner ofthe HyperCrash main window).

Step 8: Click Save in the properties panel to allocate the property and answerYes to thequestion in the Dialog Menu Bar, New PARTS have been selected. Do you wantto continue? Then, click Close to close the properties panel.

Section 7: Mat & Prop Allocation from the TreeWindowStep 1: In the Tree Window, highlight the assembly called RIGHT_DOOR and click the

Isolate Tree Selections button( ).

Step 2: In the Tree Window, click the right mouse button and select List Selection.




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Step 3: In the Selection ListWindow, click the right door dr2outer part to highlight

it.

Step 4: Click the right mouse button and select Change Thickness.




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Step 5: In the Change Thickness pop-up panel, enter1.20 and click Ok (see following

image).

Step 6: In the Selection ListWindow, click the RIGHT_DOOR assembly to highlight it.

Step 7: Click the right mouse button and select Change Material.

Step 8: In the Material File Window, select STEEL and click OK. The PLAS_JOHNS

Material curve (Stress vs. Strain) will appear:




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Step 9: Click Savein the PLAS_JOHNS window. To confirm the curve, click Yes in the

Dialog Menu Bar.




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Note: You can modify the material law parameters and clickApply to update the curve.

Step 10:See the Selection ListWindow to view the results.

Step 11:Explore the different options available in the Selection L istWindow.

Step 12:Click Close in the List Selection Window.

Step 13: In the Model Display menu, click the Display All ( ) or (Ctrl+S) and Fit Model

( ) or (Ctrl+R) icons to display the whole model in the Graphic Window.




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Chapter 4: Element Creation/Modification

Chapter 4

Element Creation / Modification

The purpose of this chapter is to create and modify elements with HyperCrash.


Section 1: Create New ElementsStep 1: In the Tree Window, highlight the part called RAILS-U-FT-O-R(in the assembly


Step 2: Click the Isolate Tree Selections button ( ).

Step 3: From the Pull-down Menu Bar, select Mesh Editing, Node, then Create.

.

Step 4: In the Mesh Editing panel, select the Copy sub-panel:




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Step 5: Zoom in on the area depicted in the following image (using the center mousebutton), click the button to select the nodes to duplicate, and click Yes in theDialog Menu Barafter the last node for duplication selection is done.

Step 6: Click the button to define the displacement vector and click two nodes on therail.




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Step 7: View the translation with the See translation button ( ) and click Save to save it.

Step 8: Follow Steps 6 to 8, selecting the appropriate nodes to obtain the result below thenclose node creation:

Step 9: In the Mesh Editing Panel, use the drop-down menu to choose theElement/Create sub-panel.

Step 10:Click the Include picked part button ( ) and select the part displayed in theGraphic Window (RAILS-U-FT-O-R).

. y

Step 11:From the drop-down menu, choose element type to create and select Shell4nand-or Shell3n. Then, select the nodes to create new elements.




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Step 12: Press ESC or click Cancel in the Dialog Menu Barwhen the element creation is.

Completed. Next, click Save and then click Close to close the Mesh Editing panel.

Section 2: Modify ElementsStep 1: In the Tree Window, highlight the part called RAILS-U-FT-O-R (in the assembly



Step 3: From the Pull-down Menu Bar, select Mesh Editing, then Element, then Modify.

Step 4: In the Mesh Editing panel, select 2D:

Step 5: Zoom in on the designated area (using the middle mouse button). Click the Split

Shell 4 nodes in 2 shells 3 nodes button ( ). Select one element and onenode, and click Save to confirm. When finished, press ESC or click Cancel in theDialog Menu Bar.




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Step 6: Delete the elements on the edge.

1. Click theAdd/Removeelements by picking selection button ( ), and, in theGraphic Window, select the elements that you want to delete and click Yes in theDialog Menu Barto end the elements selection.

2. Delete the elements by clicking the Remove selected shell4 nodes or shell 3 nodes

icon ( ) and click Yes in the Dialog Menu Barto return to the Modify > Elementpanel.

3. Click Cancel in the Dialog Menu Barto complete element selection.

4. Click Close to close the Modify / Element panel.




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Section 3: Split a Part into Two PartsHyperCrash allows you to split a part into two parts.

Step 1: In the Tree Window, highlight the parts called RAILS-U-FT-O-R (in the assembly



Step 3: From the Pull-down Menu Bar, click Mesh Editing, then Part, then Split.

Step 4: Click the Include picked parts button ( ), and, in the Graphic Window, selectthe part to be split (RAILS-U-FT-O-R).

Step 5: Click theAdd elements by box selection button ( ), and, in the GraphicWindow, select the elements as shown below.

Note: Apply the view shown above for the selection to avoid left/right confusion.

Step 6: Select the toggle, Create new Part.

Step 7: In the New part name field, enter the name RAIL-U-FT-O-L and click Ok (see

following image).

Step 8: Keep the same thickness and the same material (see following image).

Step 9: Click Save and then Close to return to the main menu.




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Note: The old part and the new one are grouped in special group of parts named

New_physical_part as shown, following. It is not possible to move the parts out

of this group.

Section 4: Create a ReinforcementStep 1: In the Tree Window, highlight the parts called RAIL-U-FT-O-L (in the assembly

Body in WhiteFramesNew_physical_part).


Step 3: From the Pull-down Menu Bar, select Mesh Editing, then Part, then Sheet.

Step 4: In the Mesh Editing panel, select Stiffner.

Step 5: Enter the name of the reinforcement, REINF_L, and click OK.

Step 6: Select the part: click , then pick the part in the graphic window, and validate in

the dialog window. Use the icon to choose the elements to be offset to createthe new part.




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Step 7: In the Material section of the panel select the toggle to keep the same material. Inthe Property section, keep the same thickness value; you can change it byentering a new value.

Step 8: In the Translation section of the panel, select a normal to elements translation.

Step 9: In the Offset section of the panel, enter an offset value of1.2 and press OK (see

following image) to check the result which is an outer reinforcement. (A negativeoffset value here would create an inner reinforcement.)




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Step 10:Click Save, then click Close to close the panel.

Section 5: Create a Symmetry of a PartStep 1: In the Tree Window, highlight the part called REINF_L.


Step 3: From the Pull-down Menu Bar, select Mesh Editing, then Part, then Duplicate.

Step 4: Using the Include picked part button ( ), select the part, REINF_L, and confirm

(Yes in the Dialog Menu Bar).

Step 5: From the Options pull-down menu, select Mesh only.

Step 6: Click the Mirroricon ( ).

Step 7: ClickApply mir ror, click Save, and then click Close to close the panel.




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Note: The created part is located in the Duplicated parts assembly in the Tree

Window.

Step 8: We need to attach the reinforcement to the frame: Go to mesh Editing

Enter Left_ Reinf. Rigid Body as name and click ok.

Click on ( ) to select the rigid body slave nodes; after selecting, click yes to completethe selection then Click on Save.

Repeat The same step to attach all the reinforcement plates, and close Mesh Editing.


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Chapter 5: Connections

Chapter 5

Connections

Following the steps in Chapter 2.1, load the model called CHPT4_0000.rad.

Section 1: Read a Spotfi le fi le (MWF Format)

Step 1: In the Display Toolbarclick the Display All ( ) and Fit Model ( ) icons todisplay the whole model.

Step 2: From the Pull-down Menu Bar, select Connections, then click Spotweld , thenImport from File.

Step 3: In thespotweld file window, select the file, spotfile (see following image), and

click OK .




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Step 4: While HyperCrash is automatically creating the spotwelds, you can open the file

called spotfile with the editor of your choice and view the format.

Step 5: As soon as HyperCrash completes the spotweld creation, correct the few badspotwelds:

Note: The bad spotwelds are highlighted in red in the Spotweld > Modify sub-window(see following image). HyperCrash declares a spotweld bad when it does not meetthe specified weld criteria, see below

.

1. In the Spotweld > Modify panel, click the first bad spotweld.


Proprietary Information of Alt air Engineering, Inc


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2. Click the See selected spotweld(s) button ( ) to display the spotweld in the GraphicWindow.

Click the Fit Model button ( ) in the Display Toolbarto see the parts and the badspotweld location (small yellow and red sphere: ).

Bad spotweld location.

Parts 137 & 138

Should be welded

3. Select the Location > Element tab.

4. Click the Pick one shell element and see spotweld button ( ).




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5. In the Graphic Window, click an element to define the new location for the spotweld. Ifthe new location is acceptable, two green elements and a blue spotweld appear on thescreen.

6. Click Save to confirm the new location. An acceptable spotweld is created and the(uncreated) bad spotweld is automatically removed from the red color list)

Bad spotweld 5: Click this element

The green color meansthat HyperCrash can

create the spotweld atthis new location

6: Saved spotweld

Two red elements = RADIOSS interface type2

Two green nodes + one blue spring =RADIOSS spring type 13

7. Repeat Steps 1 to 6 to correct or eliminate all the bad spotwelds (red color list) andthen close the panel.

Section 2: Display Spotweld OptionsStep 1: In the Pull-down Menu Bar, click Spotweld , then Modify.

Step 2: In the Tree Window, highlight the part called right door-FT-O-R (in the

assembly, DOORS RIGHT DOOR).


Step 4: In the Spotweld > Modify panel, click the Include picked parts buttonStep 5: In the Graphic Window, click the displayed part and validate the selection with

Yes. All the spotwelds that belong to this part are displayed.




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Note:

All the spotwelds that belong to the selected part are highlighted in the Spotweld > Modify panel.

Press SHIFT+F8 to hide the spotwelds from the screen, and click Close to close thepanel.

Step 6: In the Tree Window, highlight the same part (right door-FT-O-R).

Step 7: Click the right mouse button and select Connections.




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Step 8: The spotweld connections that belong to this part are displayed in the smallNotebook Window.

Step 9: In the Notebook Window,right-click the spotweld connections to display,undisplay, and clear the spotwelds from Graphic Window.

Note: When selecting an assembly, the Internal Connections and ExternalConnections options are available.

Internal Connections searches for the connections between the parts of theselected assembly.

External Connections searches for the connections between the parts of theselected assembly and the rest of the model.

Section 3: Spotweld CheckingStep 1: In the Pull-down Menu Bar, click Spotweld , then Criteria.

Step 2: In the Check Criteria Window, select the criteria you want to check and enter thevalues you want for each parameter (it is recommended to use the default values

as depicted in the image below).Spring Length Min: 0.1 mm

Spring Length Max: 10 mm

Angle Max: 15 degrees

Time Step: 8e-7 s




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Step 3: In the Drop-down Menu Bar, click Spotweld, then Check.

Note: The spotwelds beyond the selected criteria are highlighted (orange list) in theSpotweld > Check panel. They will be referred to as marginal spotwelds.

Step 4: Select one marginal spotweld in the orange list and click the button.

Step 5: See the message in green in the Message Window (lower-left corner ofHyperCrash main window) to learn why this spotweld is considered marginal.




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Step 6: Modify the spotweld.

Note: When you click the button, the spotweld and its attached parts are displayed inthe Graphic Window. Changing the location of the spotweld is likely to correct thespotweld as in the example below. Follow steps 3 to 6 to do so.

HyperCrash proposal Relocation of the spotweld The new spotweld is created

Step 7: Repeat step 3 to 6 for the other marginal spotwelds.

Step 8: Click Close to close the Spotweld > Check panel.




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Section 4: Create a Few New SpotweldsStep 1: From the Pull-down Menu Bar, click Connections, then Spotweld , then Create.

Step 2: In the Tree Window, highlight the parts called right door-FT-I-R and right

door-FT-O-R.


Step 4: Go back to the Spotweld > Create panel and click the Include parts by boxbutton ( ).

Step 5: In the Graphic Window, drag a box to select the two parts.

Step 6: In the Element sub-panel, click the Pick one shell element and see spotweld

button ( ).

Step 7: In the Graphic Window, click an element to weld the two parts. Two greenelements and a blue spotweld appear on the screen.

Step 8: To save this spotweld, click Save in the Spotweld > Create panel. The spotweldis created.

Step 9: Repeat step 7 and 8 to create a few more spotwelds on the two parts.




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7: Click an elementGreen means that HyperCrash can createthe spotweld at this location

8: Saved spotweldTwo red elements = interface type 2Two green nodes + one blue spring = springtype 13

Note: You can also click the Node sub-panel and click nodes in the Graphic Window or

the Line sub-panel to automatically create spotwelds between two nodes or twoelements with a certain pitch length.

Step 10:Click Cancel in the Dialog Menu Barto stop the selection.

Section 5: Export a New Spotweld FileStep 1: In the Pull-down Menu Bar, click Connections, then Export File, and selectAl l

Spotwelds with Property Id.

Step 2: In the Export connection file with p roperty Id window, enterSpotfile2 and

click OK (see following image).




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Step 3: Click Close to close the Spotweld panel and return to the main window.

Section 6: Bolt CreationStep 1: From the Pull-down Menu Bar, select Connections, then click Bolt and select

Create.

Step 2: In the Tree Window, highlight the part, RIGHT-ARM (in the assembly Front

suspension) and the parts RIGHT-SUBFRAME-1 and RIGHT-SUBFRAME-2 (in

the assembly Subframe).





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Step 4: Go back to the Bolt > Create panel. The First Set button ( ) is alreadyactivated, so click the Include picked parts button ( ).

Step 5: In the Graphic Window, click the part, RIGHT-ARM to highlight it. Click Yes in theDialogMenu Barto confirm the selection.

Step 6: Click the Second Set button ( ) to activate it, then, click the Include picked

parts button ( ).

Step 7: In the Graphic Window, click the parts RIGHT-SUBFRAME-1 and RIGHT-SUBFRAME-2 to highlight them. Click Yes in the DialogMenu Barto confirm theselection.

Step 8: In the Location panel, select the Node sub-panel.

Step 9: Enter the following coordinates: X=3782, Y=400 and Z=187 (see following

image).

Step 10:Click the Put coordinates and see bolt button ( ). A blue cylinder appears inthe Graphic Window. This cylinder represents the bolt.




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Step 11:Select the Direction sub-panel and uncheck the Normal to element(s) toggle.

Step 12:Enter the X, Y, and Z coordinates, X=1Y=0Z=0to define the bolt direction

(see following image). Then, press the ENTER key. The bolt moves to the correctdirection.




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Step 13: In the Properties section, enterRIGHT REAR FIXING for the Bolt Name, 40 for

the Length 1, 40 for the Length 2, and 60 for the Diameter(see following image).

Then, press the ENTER key.

Note: When you press the ENTER key, the nodes included in the blue cylinder becomered. Those nodes will be part of the bolt.

Step 14:Click the Bolt with spring toggle to activate it (see the note, following).

Step 15:Click Save and then Close to return to the main menu.

Note: When you click save, the bolt becomes yellow and two red rigid bodies and a smallgreen spring appear on the screen. Press SHIFT+F8 to hide the bolt from theGraphic Window.




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Section 7: Tied Interface CreationStep 1: From the Pull-down Menu Bar, select LoadCase and click Contact interfaces, then

Create/Modify.

Step 2: In the Choose Contact section of the panel, click the pull-down menu and selectKinematic Condition (Type 2).

Step 3: Click the Properties tab, and in the Title field, enter the name

Windshield_Connection, as shown in the following image.

Step 4: Click the Selection tab and select Slave from the options.

Step 5: In the Tree Window, highlight the WINDSHIELD-FT part (in the assembly Body

in White Body) and click the Isolate Tree Selections button ( ).

Step 6: Go back to the Contact > Create panel and select the slave nodes as shown

below (by picking ( ) or by box ( )).




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Step 7: On the Selection panel, select the toggle, Master.

Step 8: In the Tree Window, highlight the CBN-OUTER-R part (in the assembly Body in

White Body) and click Isolate Tree Selections ( ).

Step 9: Go back to the Contact > Create/Modify panel and select (by picking ( ) orby box ( )) the master elements as follows:

Step 10: In the Tree Window, highlight the CBN-OUTER-L part (in the assembly Body in

White Body) and click the Isolate Tree Selections button ( ).

Step 11:Go back to the Contact > Create/Modify panel and select (by picking ( ) orby box ( )) the master elements on the other side.




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Step 12:Click Save and Close to close the Contact Interface panel.

Section 8: Check the Model ConnectionsStep 1: In the Tree Window, select the whole model.

Step 2: In the Pull-down Menu Bar, select Quality, then Check Connectivity of TreeSelection. This menu allows you to find if a part is not connected to the rest of themodel (that is, a free part).

Step 3: Click the Expand/Collapse all button ( ).




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Step 4: Click the See parts connectivity to picked part button ( ), and then select apart in the Graphic Window. You will see all the parts connected to the picked partin the Notebook Window. When finished, click Cancel in the Dialog Menu Bar.

Step 5: In the part group list, click one group to highlight it, then click the Isolate Tree

Selections button ( ) to display it on the screen.

Step 6: Click Display All ( ) and Fit Model ( ) buttons to display the whole model inthe Graphic Window.


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Chapter 6: Merge and Connect Subsystems

Chapter 6

Merge and Connect theSubsystems

The purpose of this chapter is to merge subsystems with HyperCrash and to manage themodel mass.


Section 1: Read the Engine File

Step 1: Click the Display All ( ) and Fit Model ( ) buttons to display the wholemodel in the Graphic Window.

Step 2: In the Pull-down Menu Bar, click File, Import then RADIOSS

Step 3: In the HyperCrash window select Merge.

Step 4: In the Select a RADIOSS File window, select ENGINE_0000.rad and click OK(see following image).




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Step 5: In the Offset Values section of the Merge panel,since the engine andtransmissions coordinates are already correct. click Merge to merge the engineand transmission.




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Note:

The merged subsystem is highlighted in the Graphic Window. Click the Refresh

button ( ) to return to a normal display.




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Section 2: Connect the Engine and theTransmissionStep 1: In the Tree Window, highlight the parts called ENGINE_MOUNT1 (from the

assembly Body in White Frames) and ENGINE (from the assembly

Engine).


Step 3: From the Pull-down Menu Bar, click Mesh Editing, then Rigid Body, then Create.




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Step 4: Enter the nameLEFT ENGINE MOUNT (see following image) and click Ok.

Step 5: In the Selections panel, use the different selection icons to set your node selectionas shown in image below.

Step 6: In the Graphic Window, zoom in on the left engine mount ENGINE_MOUNT1, andselect a few nodes.




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Step 7: Click Save to save the selection.

Note:

Buttons are available to help you select or deselect slave nodes during the rigid body

definition. Use the F6 key as a switch to display or hide the rigid bodies in the Graphic

Window.

Step 8: Click Close in the Rigid body panel to return to the main window.

Step 9: In the Tree Window, highlight the parts called CONNECTION (from the assembly

Frontsuspension) and FR_AXLE (from the assembly Engine).

Step 10:Click the Display Tree Selections button ( ).

Step 11: In the Pull-down Menu Bar, click Mesh Editing, then Node, then Modify.




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Step 12:Select the Merge mult i sub-panel.

Step 13:Click the toggle Set1 and click the Include picked part button( ).Step 14: In the Graphic Window, pick the part CONNECTION to highlight it.

Step 15:Click Yes in the Dialog Menu Barto confirm the selection.

Step 16:Click the toggle Set2 and click the Include picked part button ( ).

Step 17: In the Graphic Window, pick the part FR_AXLE to highlight it.

Step 18:Click Yes in the Dialog Menu Barto confirm the selection.

Step 19: In the gap search to merge field, enter the value, 0.2 and click the See Node(s)

to merge Selections button ( ). HyperCrash highlights in red the nodes that itsuggests for you to merge.

Step 20:To merge the suggested nodes, click Save.




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HyperCrash highlights the node(s) it suggeststo merge.

Step 21:Click Close in the Merge Mult i panel to return to the main window.

Section 3: Check the Mass Balance of Your ModelHyperCrash allows you to check the model mass and adjust it according to the real mass ofthe vehicle.

Assume that the values are coming from the tests:

Tested vehicle mass = 0.7 T

Weight on f ront axis = 0.443395 T

Weight on rear axis = 0.256605 T

Step 1: From the Pull-down Menu Bar, click Mass Balance and select Compute and

managemodel mass.




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Step 2: HyperCrash gives you information about the model mass and the center of gravity(COG).

Step 3: Click to enter the theoretical mass of your vehicle: 1.24156 T. Click OK.




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Step 4: Enter the X coordinates of the front and rear axles:

Xfront = 3750mm

XRear= 1062mm

Note: These values can be entered using the Determine axles by picking node button

( ).

Step 5: Click to view the mass on the front and rear axles.

Step 6: Modify theses values with respect to the test results:

Weight on f ront axle = 0.515589 T

Weight on rear axle = 0.448653 T

Step 7: You can select Added mass to modify by clicking to choose the addedmasses to which the modifications will apply and those to which they will not apply.

Note: the button opens the following panel in order to include your mass distributionselection among the available added masses. To save your choices, click SaveConfiguration. You may print a report by clicking Print.

Step 8: To close the window without saving any changes, click Cancel All.

Step 9: On the Added Mass Management panel, click to modify the car mass.

Step 10:Click to see the modifications to the different added masses.




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Step 11:Click Save to save the modifications and Close to close the panel.

Section 4: Merge the BarrierStep 1: In the Pull-down Menu Bar, click File, Import__> RADIOSS then Merge.

Step 3: Select ODBBLD00 and click OK.




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Section 5: Move the Barrier to its Correct LocationStep 1: Check the Apply Transformation then in the Translation along values: enterX= -

1576,Y =14,andZ=624 (see following image), and click Merge to reposition the

barrier in the correct location.




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Chapter 7: RADIOSS Features

Chapter 7

RADIOSS Features

The purpose of this chapter is to create some RADIOSS features such as boundaryconditions, interfaces, initial velocity, added mass and rigid walls.

Following the steps in Chapter 2, Section.1, load the model called CHPT6_0000. r ad.

Section 1: Create a Boundary ConditionStep 1: From the Pull-down Menu Bar, select LoadCase, then Boundary Conditions, then

Create.

Step 2: In the field provided, enter the name FI X_ODB (see following image) and click OK.




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Step 3: Use the F6 key to display the rigid bodies.

Step 4: In the Graphic Window, zoom in at the back of the barrier to clearly locate itsmaster node (see image, following). Then, click theAdd/Remove nodes by

picking selection button ( ) to select the ODB rigid body master node in theGraphic Window (it turns red).

Step 5: Click Yes in the Dialog Menu Barto confirm the selection.

Step 6: In the Boundary condition components section of the Create panel, toggle alltranslations and rotations to fix all the degrees of freedom for this node.





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Section 2: Create an Interface to Handle theContacts for the CarStep 1: From the Pull-down Menu Bar, select LoadCase and click Contact interfaces, then

Create/Modify.

Step 2: Using the Choose Contact pull-down menu, select Multi usage (Type 7).

Step 3: Click the Properties tab. In the field, Title, enter the name CAR_CAR (see followingimage).

Step 4: Click the Selection tab, and select the surface choice, Self-Impact (see followingimage).




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Step 5: In the Tree Window, select all the assemblies and parts of the model exceptODB

assembly and click the Isolate Tree Selections button ( ).

Step 6: Go back to Contact Interface panel, and use theAdd selec ted par ts by box

button ( ) to select elements.

Step 7: In the Graphic Window, drag a box to select the following elements:

Note: The selected elements are highlighted in red.

Step 8: In the Properties sub-panel, enter the following values (see following image):

Coulomb friction = 0. 2

Scale factor for stiffness = 1. 0

Min. gap for impact activ, = 0. 7

For Friction penalty formulation set to Stiffness




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Section 3: Create an Interface to Handle theContacts between the Car and the BarrierStep 1: From the Pull-down Menu Bar, select LoadCase and click Contact Interf. >

Create/Modify.

Step 2: Using the Choose Contact pull-down menu, select Multi usage (Type 7).

Step 3: Click the Properties tab. In the Title field, enter the name CAR_BARRI ER.

Step 4: Click the Selection tab. From the surface options, select Slave.

Step 5: Click theAdd selected par ts by box button ( ) and drag a box around the frontof the car as shown in the example, following (the parts are highlighted in red).

Step 6: Next, select Masterfrom the surface options.

Step 7: In the Tree Window, highlight the following parts in the ODB assembly and click the

Isolate Tree Selections button ( ):




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Step 8: Go back to the Contact panel, click on ( ) to show the solid external face only.

In the Selections sub-panel, click theAdd selec ted par ts of Tree button ( ).

Step 9: In the Properties sub-panel, enter the following values:

Coulomb friction = 0. 2Scale factor for stiffness = 1. 0Min. gap for impact activ. =0. 7

For Friction penalty formulation set to Stiffness

Step 10:Click Save+sym. (see the next Note) and then Close to return to the main menu.

Note:

When you click the Save+sym. button, HyperCrash saves the defined interface andautomatically creates its symmetric: the slave surface becomes master surface, andthe master surface becomes slave surface.

The Save+sym. option is not available for a Self-Impact interface.

The extension_symis added to the symmetric interface name.

Interface CAR_BARRIER Interface CAR_BARRIER_sym

Slave Master

Master Slave

Section 4: Create an Initial Velocity to Apply to theEntire CarStep 1: From the Pull-down Menu Bar, select LoadCase and click Initial Velocities, then

Create.




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Step 2: Enter35 MPH for the title and click OK.

Step 3: In the Tree Window, highlight all the assemblies and parts exceptODB.

Step 4: Go back to the Initial Velocity panel, click theAdd selec ted par ts of Tree button

( ). All the nodes are highlighted except the ODB nodes.

Step 5: In the Translation Components field, enterVx=+15646. 4 as shown in thefollowing image (15646.4 mm/s = 35 MPH).




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Step 6: Click Save, answerYes to the question in the Dialog window, and then clickClose.

Section 5: Create an Added Mass on the Right DoorStep 1: From the Pull-down Menu Bar, select LoadCase and clickAdded Masses, then

Create.




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Step 2: Enter the name Door 5 kg and click OK.

Step 3: For the selection, click the Include picked parts button ( ).

Step 4: In the Graphic Window, click the right door inner part (it becomes red).

.

Step 5: Click Yes to confirm the selection in the Dialog Menu Bar.

Step 6: Enter0. 005 in the Mass field as shown in the following image (0.005 T = 5 kg).Note: The mass is equally distributed on all the selected nodes.




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Section 6: Create a Rigid Wall to Model the Ground

Step 1: From the Pull-down Menu Bar, select LoadCase and click Rigid Walls, thenCreate.

Step 2: From the Rigid Walls drop-down menu, select Infinite Plane.

Step 3: In the Rigid wall name field, enter the name GROUNDas shown in the followingimage.

Step 4: Enter the following values for M0 and M1 as shown in the following image:

M0 X=0 M1 X=0

Y=0 Y=0

Z=5. 9 Z=10

Step 5: In the Section sub-panel, in the Distance for search of s lave nodes field, enter a

value of200mm (see following image).




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Note: You can use the selection icons to add or remove nodes from the rigid wall

selection.Step 6: Switch to the Properties sub-panel.

Step 7: For the Friction Parameters, keep the Sliding option.

Step 8: Select the Fixed option.

Step 9: Click the see button.

Step 10:Click Save and then Close to return to the main menu.


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Chapter 8: Quality Check

Chapter 8

Quality Check

The purpose of this chapter is to show you how to use the Quality module in HyperCrash.

Following the steps in Chapter 2, Section.1, load the model called CHPT7_0000. r ad.

Section 1: Check Intersections and Penetrations inYour ModelStep 1: From the Pull-downMenu Bar, click Quality, then Check All Interfaces and wait

for HyperCrash to find all the interfaces. This may take a few seconds.

Note: You can check the interfaces one-by-one using the Check selected interface

button in the Loadcase, Contact interf.>

Create/Modify menu.Step 2: In the Quality > Contact panel, toggle Intersection at the top of the panel and

select the CAR_CAR interface.




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Step 3: On the lower part of the Contact panel, select one intersection at a time and vieweach in the Graphic Window.

Note:

It is easier to see the intersections if the model is in Poly. + Line view (from theDisplay menu).

You may also adjust the level of transparency using the Control transparency level

icon ( ).

Note: Click the Refresh button ( ) if you want to return to a normal display. Select theCAR_CAR interface from the list at the top of the Contact panel.

Step 4: Click the Select/Unselect Al l button ( ) to select all the intersections in partpairs.

Step 5: Click the Remove Intersections button ( ) to launch the automatic intersectioncorrection. This may take a few seconds to complete.




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Initial state: 15 intersections in part pairs.

Int . shows the number of intersections in each part pair.

At the end of the automatic intersection correction, only two remain. Thoseintersections have to be corrected manually (see following).

Step 6: Click the first remaining intersection to highlight it.Step 7: Click one of the following buttons to move the nodes and remove the intersection.

Click:

to move one or several nodes in the plane defined by the neighboringelementsto move one or several nodes in the plane defined by the first selected nodeand two other nodesto move one or several nodes along the normal of the plane defined by thefirst selected node and two other nodesto move one or several nodes in the plane defined by the screen

Step 8: Click the Recheck Intersections button ( ). If the problem is solved, theintersection is removed from the list and HyperCrash automatically continues to thenext intersection. If the problem is not solved, repeat the steps 7 and 8 in order tomove the nodes and correct the intersection.

Step 9: Validate the node picking and moving in the Dialog Menu Bar.

Note: While you are moving a node, the quality of elements around the node is shown incolor:

Green = good

Orange = acceptable

Red = bad

Note: Sometimes, HyperCrash suggests displacements by displaying arrows:

To perform these displacements, click the Remove Intersections button ( ) tomove the nodes automatically.

If you want to decline the proposed displacements, click the button.




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If you want to delete an arrow, click the button, then click a node that displaysan arrow (node is highlighted) in the Graphic Window, and validate with Yes in theDialog Menu Bar.

Step 10:Click the Check Penetrations button ( ) to check the penetrations and selectthe Penetrations toggle at the top of the panel to switch to the penetration page.

Step 11: In the Gap Interface field, the gap value input in the interface definition will beshown by default.

Step 12:Click the Select/Unselect Al l button ( ) to select all the penetrations.

Step 13:Click the Depenetrate auto button ( ) to launch the automatic penetrationcorrection.

Step 14:Wait for HyperCrash to finish the correction process (this may take a few seconds).

Note: There are two options to find and to correct the penetrations in HyperCrash: youmay use either a variable or a constant gap.

The variable gap option (ifGap_interface = variable) searches and corrects thepenetrations, taking the actual thicknesses of the plates into account (coming fromthe PID).

The constant gap option (if you enter a value forGap_interface) uses a (user-defined) fixed value (the value might be the gap of your interface, for instance) tosearch and correct the penetrations.

At the end of the automatic penetration correction, 0 penetrations remain: all thepenetrations are automatically corrected by HyperCrash.




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Section 2: Check the ThicknessesStep 1: In the Quality > Visu Thick. Sub-panel, enter0. 1for the Min value.Step 2: Enter5mm for the Max value.

Step 3: Make sure to display and the Model and Click on Fit Model ( )

Documents

HyperCrash Introduction