07_parasolid_PAT301

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PAT301, Workshop 7, December 2005

Copyright 2005 MSC.Software Corporation

WORKSHOP 7

PARASOLID SOLID EXAMPLE


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z Workshop Objectives

z Learn some of the steps that can be used to create a B-repsolid, i.e. extrude surface, shell, and edge blend. Then, createthe finite element model. Analyze the model, and postprocessthe results from its analysis.

z Problem Description

z Display the deformed shape of the model using shaded render.Also, display the von Mises stress fringe.

z Tension fitting material: Aluminum with E = 10 x 106 psi and = 0.3

z Total load on tension fitting = 5000 lbf

z Software Versionz MSC.Patran 2005r2

z MSC.Nastran 2005r2b


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z Key Concepts and Steps:

z Database: create a new database with Analysis Code = MSC.Nastran

and Analysis Type = Structural

z Geometry: create B-rep solid by extruding a created surface, then do

various things like shell and edge blendz Elements: mesh the geometric solid with solid Tet10 elements

z Loads/BCs: constrain the three holes at bottom of solid, and apply a

Total Load to the large hole at the back of the fitting

z Materials: specify an isotropic material for Aluminum

z Properties: create a 3D solid property

z Analysis: Solution Type = Nastran Linear Static, Solution Sequence =

101, Method = Full Run

z Analysis: access analysis results by attaching the XDB file to database

z Results: plot model deformation and von Mises stress results


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Step 1. Create New Database for Tension Fitting

Create a new database called

tension_fitting.db.

a. File / New.

b. Entertension_fitting as

the file name.

c. Click OK.

d. Choose Based on Model

for Tolerance.

e. Choose MSC Nastran andStructural for Analysis

Code and Type.

f. Click OK.

a

b c

d

e

f


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Step 2. Create Surface

Create the Geometry for the

tension fitting.

a. Geometry : Create /Surface / XYZ.

b. EnterforVector

Coordinates List.

c. Enter[0 0 0] forOrigin

Coordinates List.

d. Click Apply.

a

b

c

d


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Step 2. Create Surface (Cont.)

Copy points at opposite corners.

a. Click increase Point Sizeicon to show all points

enlarged.

b. Geometry : Transform /

Point / Translate.

c. Enter for

Translation Vector.d. Select top-left corner and

click Apply.

e. Enter for

Translation Vector.

f. Select bottom-right corner

and click Apply.

a

b

c e

d f

f

d


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Create a curve by connecting the twotranslated points and break thesurface with the curve.

a. Geometry: Create/Curve/Point.

b. Click on one of the two points

from translation as the startingpoint and the other as theending point.

a

b

b

S 2 C S f (C )


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Break the surface and delete

the upper portion of the

original surface.a. Geometry : Edit / Surface

/ Break.

b. Turn Auto Execute off.

c. Select the rectangularsurface for the Surface

List and the sloped curvefor the Break Curve List.

d. Click Apply andYeswhen message boxappears.

e. Click the RefreshGraphics icon.

a

c

e

b

d

St 2 C t S f (C t )


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Delete the upper surface(above the break curve).

a. Geometry : Delete

/ Surface.

b. Click on the

triangular surface

for the SurfaceList.

c. Click Apply.

a

b

c

St 3 E t d th S f t C t S lid


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Create a Parasolid solid by

extruding the surface in the Z-

direction.a. Geometry : Create / Solid

/ Extrude.

b. Make sure TetMeshable

solid icon is selected.

c. Enter for the

Translation Vector.d. Select Surface 2 in the

Surface List Box.

e. Click Iso1 view.

f. Click the Smooth-shaded

icon.

Step 3. Extrude the Surface to Create Solid

a

b

c

d

ef

Step 4 Create a Shell Solid


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Step 4. Create a Shell Solid

Edit the solid using the shell method to

create a shelled solid.

a. Geometry : Edit / Solid / Shellb. Enter0.25 forThickness. Turn

off Auto Execute.

c. Click on Solid Face List and

hold down the shift button and

select the top, sloped, and front

faces of the solid.d. Click Apply.

a

b

d

c

c

Step 5 Create Fillets


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Step 5. Create Fillets

Create the fillets on the inner

edges of the solid.

a. Geometry : Edit / Solid /EdgeBlend.

b. Make sure that the constant

radius icon is selected.

c. Enter0.25 forConstant

Radius.

d. Make sure Edge(s) of Solidicon is selected.

e. Turn Auto Execute Off.

f. Click on Solid Edge Listand

use the shift-click technique

and select the 5 edges on the

inside of thesolid.g. Click Apply. It may be necessary to

rotate the object in order

to see the inner edges

more easily. This can be

done by using the

middle mouse button.

a

b

c

d

g

f

f

e

Step 6 Create Holes for the Tension Fitting


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Step 6. Create Holes for the Tension Fitting

Create the holes for the tension fitting

bycreating primitive solids that pass

through the solid, then subtracting

them.a. Geometry : Create / Solid /

Primitive.

b. Select the cylinder icon.

c. Enter2.0 for the Height and

0.25 for the radius.

d. Enter[-1 1.25 1] for the Base

Center Point List and Coord

0.1 for the Axis List.

e. Click Apply.

f. Geometry : Edit / Solid

/Boolean.g. Select Subtract icon.

h. Select the tension fitting for the

Target Solid.

i. Select the cylinder for the

Subtracting Solid List.

a

b

c

d

e

f

g

h

i

Step 6 Create Holes for the Tension Fitting (Cont )


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Step 6. Create Holes for the Tension Fitting (Cont.)

Create the points where the three

bottom holes will be placed by

translating an existing point and, then

translating again.a. Click wireframe icon.

b. Geometry : Transform /Point /

Translate.

c. Enter forTranslation

Vector.

d. Select point at base edge of fillet.

e. Apply

f. Enter forTranslation

Vector.

g. Select translated point.

h. Apply

i. Enter forTranslation

Vector.

j. Enter2 forrepeat count.

k. Select translated point.

l. Apply

a

b

c

j

g

k

d

d

e

Step 6 Create Holes for the Tension Fitting (Cont )


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e

j

Step 6. Create Holes for the Tension Fitting (Cont.)

Create cylinders using points as base

centers and then create holes by

subtracting them from the solid.

a. Click Smooth shaded icon.

b. Geometry : Create / Solid /Primitive.

c. Select cylinder icon.

d. Enter -1.0 forHeight List

and 0.125 forRadius List.

e. Use the shift-click technique to

select the three translatedpoints forBase Center Point

List.

f. EnterCoord 0.2 for axis list

and click Apply.

g. Geometry : Edit / Solid /Boolean.

h. Select subtract icon.i. Select tension fitting (Solid 1)

as Target Solid.

j. Shift-click all three cylinders forSubtracting Solid List.

k. Click Apply.

It may be

necessary to

rotate the object

several times in

order to select thecylinders with ease

b

c

d

e

f

g

i

k

j

a

h

Step 7 Create a Cylinder to Imprint Tension Fitting


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Step 7. Create a Cylinder to Imprint Tension Fitting

Create a point in the center of the

large hole in order to create the

cylinder to imprint onto the solid.a. Click wireframe icon.

b. Geometry : Create / Point /

ArcCenter.

c. Select the larger hole edge.

d. Apply

e. Geometry : Create / Solid /

Primitive.

f. Select cylinder icon.

g. Enter1.0 forHeight Listand

0.371 forRadius List.

h. Click on point in the center of

the large hole.

i. EnterCoord 0.1 forAxis List.

j. Click Apply.

k. Select Smooth Shaded icon.

a

c e

g

h

i j

k

hf

b

c

d

Step 8. Imprint the Solid


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Step 8. Imprint the Solid

Use the cylinder to imprint the

solid and then delete the

cylinder, resulting in the

finished solid.

a. Geometry : Edit / Solid /

Imprint.

b. Select the tension fitting

for the Solid List (A).

c. Select the cylinder

for the Solid to Imprint

List (B).

The solid may

seem unchanged,

but the imprint on

the solid will not

be visible until the

cylinder has beendeleted.

a

c

b

Step 9. Delete the Cylinder


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Step 9. Delete the Cylinder

Delete the cylinder and make

sure imprint method was

completed.

a. Geometry : Delete / Solid

b. Select the cylinder for

Solid List.

c. Click Apply.

a

b

c

Edge added to solid.

Step 10. TetMesh the Completed Solid


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p p

Create the TetMesh for the

tension fitting.

a. Elements : Create /

Mesh / Solid.

b. Make sure Tet,

TetMesh, and Tet10

are all selected.

c. Click on Input Listand

select the solid.d. Remove check for

Automatic Calculation

and enter0.25 forGlobal

Edge Length.

e. Click Apply.

a

b

c

d

e

Step 11. Create Loads and Constraints


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p

Create the loads and constraints

for the model.

a. Click Smooth Shadedicon

b. Loads/BCs : Create /

Total Load / Element

Uniform.

c. EnterForce as the New

Set Name.

d. Click Input Data

e. Enter for the

Loadand click OK.

f. Click Select Application

Region

g. Select the vertical solidface created by

imprinting at the larger

hole, then click Add.

h. Click OK

i. Click Apply.

a

b

c

d

e

f

g

h

iIllustrated here is the

desired application

region.g

Step 11. Create Loads and Constraints (Cont.)


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p ( )



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Create the constraints at the base holes.

a. Loads/BCs : Create / Displacement /

Nodal.

b. EnterFixed as New Set Name.c. Click Input Data

d. Enter forTranslation

only, and click OK.

e. Click Select Application Region.

f. Click on Select Geometry Entities.

g. Select Surface or Face icon

h. Shift-click the cylindrical faces of

the three holes at the base, and

Click Add.

i. Click OK.

j. Click Apply.

a

b

c

d

e

f

h

i

j hIllustrated here is the

application region for

one of the three holes.

g



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Step 12. Create Material Properties


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Create the material properties for the

model.

a. Materials : Create / Isotropic /

Manual Input

b. EnterAluminum forMaterial

Name.

c. Click Input Properties

d. Enter10E6 forElastic Modulus

and 0.3 forPoisson Ratio.e. Click OK

f. Click Apply.

a

b

d

c

ef

Step 13. Create 3D Element Properties


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Create the 3D element

properties for the tension fitting.

a. Properties : Create / 3D /

Solid.b. Enter3D_tets for

Property Set Name.

c. Click Input Properties

d. Click Mat Prop Name

icon. Select Aluminum

from Select Material.e. Click OK

f. ForApplication Region,

select entire solid by

dragging a box around it

and click Add.

g. Click Apply.

a

b

c

ef

g

d

Step 14. Check the Load Case


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Check the load case Default to

make sure that the load and constraint

Are selected.

a. Load Cases : Modify

b. Click on the load case name

Default.

c. Check to see that both the

load and constraints are

assigned.d. Click Cancel.

a

b

c

d

Step 15. Run the Analysis


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Run the Analysis with MSC.Nastran.

a. Analysis : Analyze / Entire

Model / Full Run.

b. Click Translation

Parameters...

c. Make sure XDB and Print is

selected.

d. Click OK.

e. Click Solution Type

f. Make sure LINEAR STATICis selected.

g. Click OK.

h. Click Apply.

a

b

c

d

e

f

g

h

Step 16. Access the Results


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Attach the XDB file and access

the results.

a. Analysis : Access Results /Attach XDB / Result Entities.

b. Click Select Results File

c. Select tension_fitting.xdb

and click OK.

d. Click Apply.

a

b

c

d

Step 17. Display Results


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Create a deformation plot

a. Results : Create /

Deformation.

b. Select SC1: DEFAULT,A1:Static Subcase

underSelect Result

Case(s)

c. Select Displacements,

Transitional from Select

Deformation Result.

d. Click Apply.

a

c

d

b

Step 17. Display Results (Cont.)


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Erase the geometry and do not show

the undeformed model, so that

only the deformed model is shown.

a. Display : Plot/Erase

b. Click Erase underGeometry.

c. Click OK.

d. Click Display Attributes.

e. Remove check from Show

Undeformed.

f. For the Render Style, chooseShaded.

g. Click Apply.

a

b

c

d

e

g

f



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Plot the von Mises

stress for the model.

a. Results : Create /

Fringe.

b. Select Stress Tensor

from Select Fringe

Result.

c. Select Display

Attributes, then set

Displayto Element

Edges

d. Click Apply.

It may also be helpful to change

the view several times in orderto get a better visualization of

the deformations. This can be

done either by holding down the

middle button on the mouse, or

using the view icons.

a

b

c

d


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07_parasolid_PAT301