Mid Surface Creation. Workshop 5 4. ANSYS, Inc. Proprietary Inventory # May 11, ANSYS, Inc. All rights reserved.

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Silvia French
6 years ago
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2 Overview Goal Familiarize users with mid surface capabilities that are new to Workbench 10.0 Demonstrate manual and automatic pair detection Demonstrate surface extension for interfaces Model Description 2 part bracket with consistent cross sections Since the model has consistent cross sections, shell elements will be used to mesh the model. This saves time and CPU resources.

$\bracket_mid_surface.agdb 2.$

3 1. From the workbench launcher, select Open > Design Modeler Geometry and Browse to > \bracket_mid_surface.agdb 2. In the Model Tree, note that there are 2 separate parts:

3. Each body of this model has different thicknesses.

Maximum Threshold and Minimum Threshold fields in the

4 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. Menu Bar > Selection Filter Edges. Use the status bar measuring tools to verify these thicknesses. Smaller Body Thickness = 1mm Larger Body Thickness = 2mm

5 4. Insert a mid surface object Main Menu > Tools > Mid Surface 5. In the Details of MidSurf1, change the Selection Method to Automatic 6. Enter the Minimum Threshold of 1mm and Maximum Threshold of 2mm obtained from step 3.

However, the automatic selection method has incorrectly identified the

6 7. Set Find Face Pairs Now? to Yes 8. The Face Pair Automatic Selection method will select 11 face pairs. However, the automatic 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

7 9. Editing Face Pairs The face colors help to indicate the current mode when adding or removing face pairs from the selection set.

10. To Remove Face Pairs, Click in the Details of MidSurf1 Face Pairs to enter the selection mode (Apply / Cancel). 11. In the Graphics Window Zoom as needed.

8 10. To Remove Face Pairs, Click in the Details of MidSurf1 Face Pairs to enter the selection mode (Apply / Cancel). 11. In the Graphics Window 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 remove.

13. To Reverse Face Pairs, Click in the Details of MidSurf1 Face Pairs to enter the selection mode (Apply / Cancel). 14. In the Graphics Window Zoom as needed. Click on the face to Reverse.

9 13. To Reverse Face Pairs, Click in the Details of MidSurf1 Face Pairs to enter the selection mode (Apply / Cancel). 14. In the Graphics Window Zoom as needed. 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.

10 16. Generate the Mid Surface Mid Surface Creation

Also, in the final figure below, you will see that the resulting surface bodies for the back brace are automatically

11 17. Now, instead of two solid bodies, there are four surface bodies. They cannot be combined into a single 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 automatically extended/trimmed to meet the main part of the bracket, as these were all part of one solid body originally. However, the front brace was a separate body, so it is not automatically extended.

12 18. The Surface Extension feature can be used to extend the front brace edge so that it meets the main bracket surface. Insert a Surface Extension object. Main Menu > Tools > Surface Extension Note: It may be helpful to suppress the other bodies.

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

14 20. In the Details of SurfaceExt1 Extent > Change the Extent to To Next. 21. Generate Surface edges are now extended.

In practice, it may be preferable to select the face pairs first, then allow the program to calculate

15 Alternate Method for determining Minimum and Maximum thresholds. In this example geometry, it was 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. 22. Details of MidSurf1 Set: Selection Method > Manual 23. Select: Face Pair Selection mode (Apply/Cancel)

24. Hold CTRL key down and select the face pairs on

Use the selection rectangles in the lower left

Then, CTRL key and select the face pairs on the

Select: Face Pairs : Apply Note that 2 Face Pairs

16 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 choose hidden faces). 25. Then, CTRL key and select the face pairs on the small bracket to represent the 1mm thickness. Select: Face Pairs : Apply Note that 2 Face Pairs are now in the selection set. 1 Pair representing 2mm, the other representing 1mm.

17 26. Select: Selection Method : Automatic Note that Minimum Threshold and Maximum Threshold have been filled in automatically. 27. Find Face Pairs Now? > Yes Add to Face Pairs

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

Mid-Surface Creation. Mid-Surface Tool:

Mid-Surface Creation. Mid-Surface Tool: Mid-Surface Creation Mid-Surface Tool: Reduces 3D geometry of constant thickness to a simplified shell representation ti Automatically places surface body at mid point between 3D face pairs Allows shell