WS14-3 PAT301, Workshop 14, October 2003 Problem Description The main focus of this workshop is to process the simulation results. First, run the simulation using MSC.Nastran for the existing model in the database Anchor.db. Attach the results file, Anchor.xdb. Next, process the deformation results using Create/Deformation. Display the result with and without the unreformed shape of the model. Finally, process with the vonMises stress. Compare averaging and without averaging between elements. Also, compare using element shape functions and averaging within each element. Also, processing is done with a subset of elements.
WS14-4 PAT301, Workshop 14, October 2003 Suggested Exercise Steps 1. Open database Anchor.db. 2. Check load case Default. 3. Set-up for the analysis. 4. Make MSC.Nastran results accessible to MSC.Patran by attaching XDB results file. 5. View the deformation with undeformed shape. 6. View only the deformed shape. 7. View the von Mises stress results using Create/Fringe. 8. Show a fringe plot for a subset of elements. 9. Zoom in to region of highest stress. 10. Use inter-element averaging for von Mises stress. 11. Use averaging within each element. 12. Quit MSC.Patran.
WS14-5 PAT301, Workshop 14, October 2003 Step 1: Open Database Open existing database Anchor.db a.File/Open. b.Select Anchor.db. c.Click OK. a b c
WS14-6 PAT301, Workshop 14, October 2003 Step 2: Check Load Case Check the load case a.Click on the Smooth shaded icon. b.Load Case : Modify c.Select Default for Select Load Case to Modify. d.Check to see that the correct Loads/BCs have been assigned. e.Click Cancel. b c d e a
WS14-7 PAT301, Workshop 14, October 2003 Step 3: Set-up for the Analysis Set-up for the analysis. a.Analysis : Analyze / Entire Model / Full Run. b.Click Translation Parameters… c.Select XDB and Print for Data Output. d.Click OK. e.Click Solution Type. f.Select Linear Static for Solution Type. g.Click OK. h.Click Apply. a b c d e f g h
WS14-8 PAT301, Workshop 14, October 2003 Step 3: Set-up for the Analysis (Cont.) Set-up for the Analysis a.Click Subcases… b.Select Default for Available Subcases. Default should be selected automatically for Available Load Cases. c.Click Apply d.Click Cancel. e.Click Subcase Select to see that Default is selected under Subcases Selected. f.Click OK. g.Click Apply to run MSC.Nastran. a b c d f e g e
WS14-9 PAT301, Workshop 14, October 2003 Step 4: Make MSC.Nastran Results Accessible to MSC.Patran Make MSC.Nastran results accessible to MSC.Patran. a.Analysis: Access Results / Attach XDB / Result Entities. b.Click Select Results File… c.Select Anchor.xdb. d.Click OK. e.Click Apply. a b c d e
WS14-10 PAT301, Workshop 14, October 2003 Step 5: View the Deformation View the deformation results under Results. a.Result: Create/Deformation. b.Select SC1 DEFAULT… for Select Result Case(s). c.Select Displacements, Translational for Select Deformation Result. d.Click Apply. a b c d
WS14-11 PAT301, Workshop 14, October 2003 Step 6: View Only the Deformed Shape View only the deformed shape. a.Click Display Attribute. b.Select Wireframe for Render Style. c.Deselect Show Undeformed. d.Click Plot/Erase Icon. e.Click Erase for Geometry. f.Click OK. g.Click Apply. This display will produce the deformed shape without both the model geometry and undeformed finite element model. a b c d e g f
WS14-12 PAT301, Workshop 14, October 2003 Step 7: View the von Mises Stress View the Von Mises stress results shown on the deformed shape. a.Results: Create/ Fringe. b.Select Stress Tensor for Select Fringe Result. c.Click Display Attribute Icon. d.Select Element Edges for Display. e.Click Apply. a b c d e
WS14-13 PAT301, Workshop 14, October 2003 Step 8: Show a Fringe Plot for a Subset of Elements Show a fringe plot for a subset of the elements. a.Click Target Entities Icon. b.Select Elements for Target Entity. c.See Figure for Select Elements. d.Click Apply. a b c d c
WS14-14 PAT301, Workshop 14, October 2003 Step 9: Zoom to Higher Stressed Region Zoom in to see if there are sufficient tet10 elements to represent the stress gradient. a.Click View Corner Icon. b.See Figure to select the region. c.Use Mouse Rotate XY Icon to see the stress more clearly. a b c c
WS14-15 PAT301, Workshop 14, October 2003 Change how the Von Mises stress is shown on the elements under Plot Options/ Averaging Definition. a.Click on Fit view and Iso 3 view icons. b.Results: Create / Fringe. c.Select Plot Option Icon. d.Select None for Domain. e.Select Derive/Average for Method. f.For Intra-element (within an element) select Shape Fn. For Extrapolation. g.Select the Target Entities icon and set the entity to Current Viewport. h.Click Apply. Step 10: Use Inter-element Averaging for von Mises Stress The results are different, but do not differ greatly b c d e f h a g
WS14-16 PAT301, Workshop 14, October 2003 Step 11: Use Average Extrapolation Within Each Element Use average extrapolation to see the difference. a.Results: Create/Fringe. b.Select All Entities for Domain/ Averaging Definition. c.Select Derive/Average for Method. d.Select Average for Extrapolation for intra- element. e.Click Apply. Under Extrapolation see how using Average (Patran averages results within each element and uses them at the respective element nodes) produces different results from using the default setting Shape Fn. (the shape function for each element is used to determine results at the respective element nodes) b c d a e
WS14-17 PAT301, Workshop 14, October 2003 Step 12: Quit MSC.Patran Quit MSC.Patran a.Select File on the Menu Bar and select Quit from the drop down menu a