DM 11 CH05 adv3.ppt - ttu.eeinnomet.ttu.ee/martin/MER0070/WB/WS2/MidSurfaceBracket/DM_11_m… · Open > Design Modeler Geometry and Brow se to > …\bracket_mid_surface.agdb nModel

Training Manual

Mid-Surface CreationTraining Manual

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Mid-Surface Tool: Reduces 3D geometry of constant thickness to a simplified shell

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representation Automatically places surface body at mid point between 3D face pairs Allows shell element type meshing in Simulation

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May 11, 2007 2007 ANSYS, Inc. All rights reserved.

Inventory #0024965-71

ANSYS, Inc. Proprietary

3D Model Mid-Surface representation

Training Manual


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Manual Mid-Surface creation: With Face Pairs, Apply/Cancel buttons

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active, choose the face pair Note the order of selection determines the

surface normal direction Notice the first surface picked is displayed in erypurple, the second is shown in pink

1st1stPick

2ndNormal

Direction2Pick

Direction

Resulting




Resulting Surface Body

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Selection Note: While in select mode (apply/cancel active) the color scheme described earlier is in effect. When the selection is finalized the selected pairs are displayed in dark and light blue

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selected pairs are displayed in dark and light blue.

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Mid-surface details: Multiple surface pairs may be selected for a single

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mid-surface operation, however they must be selected as opposing pairs (see picture)

Adjacent face pairs will be grouped together if within the Thickness Tolerance (see below)

3

12

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4

6

T1 T2

If T1 T2 < Thk Tol: surfaces are grouped



ANSYS, Inc. ProprietaryMid Surface

Training Manual


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Mid-surface details: If gaps exist in adjacent face pairs they will be sewn together within the

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Sewing Tolerance Sewing Tolerance: If Gap < Sewing Tol: surfaces are grouped

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Gap




Training Manual

Mid-Surface Creation Training Manual

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Automatic mid-surface creation: Switching the Selection Method from Manual to Automatic exposes several

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additional options Bodies to search: allows limiting search to visible bodies, selected bodies or all bodies Minimum and maximum threshold sets search range (thickness) for face pairs Extra trimming provides options for situations where trimming problems with the surface

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erbody occur (described later) Preserve bodies allows you to save the solid bodies from which surfaces are created

(default is No)




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Automatic mid-surface example: Solid body is 5 mm thick gnM

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When the mid-surface tool is inserted we switch to Automatic

Note: the Face Pairs field used in manual mode is left 0 er With a constant thickness throughout

we set the min/max threshold values to 5 mm

Using the drop down choice we g pchoose Find Face Pairs Now? = Yes

C ti d Continued . . .




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Automatic mid-surface example (continued): When the search is complete the number of pairs

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detected is listed in the details and displayed graphically

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Mid surface creation is completed by Generating the surface body




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Mixing manual and automatic selection modes:

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In some cases it is convenient to make an initial surface pair selection and let the automatic method complete the process er Example:

The model shown here contains 2 different thicknesses

In this case well select, (manually) a face pair of each thickness

We will then allow the auto face detection to complete the selection

2 mm 1 mm




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We begin by manually selecting the 2 face pairs shown here

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pairs shown here

Note the face pairs selected contain a 1 mm and a 2 mm

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We now change the selection method to Automatic

Note the min/max threshold values are automatically defined based on our manualautomatically defined based on our manual selections

Continued . . .




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We now activate Find Face Pairs Now

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Notice there are 2 options (due to the pre selection of face pairs)

Yes-Add to Face Pairs: adds auto detected faces to the existing face erpairs selected

Yes-Replace Face Pairs: will use only the auto detected faces

Choosing to add face pairs allows Choosing to add face pairs allows us to complete the operation




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Adding to, removing from or modifying automatic surface selection: gnM

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Examples: In this case the maximum threshold was

increased to intentionally detect unwanted surfaces er




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Clicking in the Face Pairs field activates selection mode (note the colors change to indicate this)

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indicate this) RMB in the graphics window provides the

optional selection modes

er In this case we can choose Remove Face Pairs then select one of the faces to be removed

When selection is complete Generate to update the model

Note when removing face pairs, selecting one of the faces will remove the pair




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Trimming options: In cases where trimming problems occur

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there are several options available to attempt corrections

Example: Using the previous model we generate the ersurface model without removing the

unwanted face pairs Since the pairs created result in T

junctions, trimming problems occur

Notice the mid-surface branch in the tree is displayed with a yellow check indicating there is a problemthere is a problem




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Using the RMB option we can Show Problematic Geometry

The resulting plot shows regions where

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The resulting plot shows regions where trimming problems have occurred

The default behavior is to intersect any untrimmed surfaces with the original solid body erbody

Other options:

Delete No Extra untrimmed Trimming




Mid Surface CreationMid Surface Creation

Workshop 5 4Workshop 5-4


ANSYS, Inc. Proprietary Inventory #0024965-86

Training Manual

Workshop 5.4, Mid-Surface Creation -Overview

Training Manual

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Familiarize users with mid-surface capabilities

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Familiarize users with mid surface capabilities that are new to Workbench 10.0

Demonstrate manual and automatic pair detection

Demonstrate surface extension for interfaces er

Model Description 2 part bracket with consistent cross sections

Si th d l h i t t ti Since the model has consistent cross sections, shell elements will be used to mesh the model. This saves time and CPU resources.




Training Manual

Workshop 5.4, Mid-Surface CreationTraining Manual

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1. From the workbench launcher, selectOpen > Design Modeler Geometry and Browse to > \bracket_mid_surface.agdb gnM

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2. In the Model Tree, note that there are 2 separate parts:




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3. Each body of this model has different thicknesses. These thickness dimensions will be entered into the Maximum Threshold and Minimum Threshold fields in the Details of the MidSurf object

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of the MidSurf object.

Menu Bar > Selection Filter Edges.

Use the status bar measuring tools to verify these thicknesses. erg y

Smaller Body Thickness = 1mm Larger Body Thickness = 2mm




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4. Insert a mid-surface objectMain Menu > Tools > Mid-Surface gnM

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5. In the Details of MidSurf1, change the Selection Method to Automatic er

6. Enter the Minimum Threshold of 1mm and Maximum Threshold of 2mm obtained from step 3.




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7. Set Find Face Pairs Now? to Yes

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8. The Face Pair Automatic Selection method will select 11 face pairs. However, the automatic selection method has incorrectlyautomatic selection method has incorrectly identified the following features:a) A face pair that is not needed.

b) A face pair whereby the normal will need




to be reversed

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9. Editing Face Pairs The face colors help to indicate the current mode

when adding or removing face pairs from the

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when adding or removing face pairs from the selection set.

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10. To Remove Face Pairs, Click in the Details of MidSurf1 Face Pairs to enter the selection mode (Apply /

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enter the selection mode (Apply / Cancel).

11. In the Graphics Window er- Zoom as needed.- Click on the face to Remove.- Right click to display the Context menu.- Select : Remove Face Pairs.

12. Note how the context bar indicates Select face pairs to removeSelect face pairs to remove .




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13. To Reverse Face Pairs, Click in the Details of MidSurf1 Face Pairs to enter the selection mode (Apply / Cancel)

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selection mode (Apply / Cancel).

14. In the Graphics Window- Zoom as needed. er- Click on the face to Reverse.- Right click to display the Context menu.- Select : Reverse Face Pairs

15. Note how the context bar indicates Select face pairs to reverse




Note that the Reverse Face pair mode operates as a toggle.

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16. Generate the Mid-Surface

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17. Now, instead of two solid bodies, there are four surface bodies. They cannot be combined into a single gnM

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body because the "T" intersections would cause it to be non-manifold. Also, in the final figure below, you will see that the resulting surface bodies for the back brace are erbodies for the back brace are automatically extended/trimmed to meet the main part of the bracket, as these were all part of one solid body originally. However, the front y g y ,brace was a separate body, so it is not automatically extended.




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18. The Surface Extension feature can be used to extend the front brace edge so that it meets the main bracket surface. gnM

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Insert a Surface Extension object. Main Menu > Tools > Surface Extension

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ANSYS, Inc. ProprietaryNote: It may be helpful to suppress the other bodies.

Training Manual


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19. Click in the Details of SurfaceExt1 Edges to enter the selection mode and select both edges (Apply / Cancel). Select: Apply

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Select: Apply

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20. In the Details of SurfaceExt1 Extent > Change the Extent to To Next.

21 Generate

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21. Generate Surface edges are now extended.

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Alternate Method for determining Minimum and Maximum thresholds. - In this example geometry, it was gnM

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relatively easy to identify and measure the solid body thicknesses. In practice, it may be preferable to select the face pairs first, then allow the program to calculate the Minimum and Maximum thresholds. er

22. Details of MidSurf1 Set: Selection Method > Manual

23. Select: Face Pair Selection mode (Apply/Cancel)




Training Manual


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24. Hold CTRL key down and select the face pairs on the large bracket to represent the 2mm thickness. Use the selection rectangles in the lower left corner to

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rectangles in the lower left corner to choose hidden faces).

25. Then, CTRL key and select the face pairs on the small bracket to represent the 1mm erpthickness.

Select: Face Pairs : Apply

Note that 2 Face Pairs are now in the selection set. 1 Pair representing 2mm, the other representing 1mm.




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26. Select: Selection Method : Automatic

Note that Minimum Threshold and

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Note that Minimum Threshold and Maximum Threshold have been filled in automatically.

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27 Find Face Pairs Now?27. Find Face Pairs Now? > Yes Add to Face Pairs




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28. The Face Pair Automatic Selection method has selected 11 face pairs which is the same number from Step 8. gnM

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Documents

DM 11 CH05 adv3.ppt - ttu.eeinnomet.ttu.ee/martin/MER0070/WB/WS2/MidSurfaceBracket/DM_11_m… · Open > Design Modeler Geometry and Brow se to > …\bracket_mid_surface.agdb nModel