patran 实例练习

,WS14-1,WORKSHOP 14ANCHOR ANALYSIS,PAT301, Workshop 14, May 2002,Problem DescriptionThe 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.,Suggested Exercise StepsOpen database Anchor.db.Check load case Default.Set-up for the analysis.Make MSC.Nastran results accessible to MSC.Patran by attaching XDB results file.View the deformation with undeformed shape.View only the deformed shape.View the von Mises stress results using Create/Fringe.Show a fringe plot for a subset of elements.Zoom in to region of highest stress.Use inter-element averaging for von Mises stress.Use averaging within each element.Quit MSC.Patran.,Step 1: Open Database,Open existing database Anchor.dbFile/Open.Select Anchor.db.Click OK.,a,b,c,Step 2: Check Load Case,Check the load caseClick on the Smooth shaded icon.Load Case : ModifySelect Default for Select Load Case to Modify.Check to see that the correct Loads/BCs have been assigned.Click Cancel.,b,c,d,e,b,Step 3: Set-up for the Analysis,Set-up for the analysis.Analysis : Analyze / Entire Model / Full Run.Click Translation ParametersSelect XDB and Print for Data Output.Click OK.Click Solution Type.Select Linear Static for Solution Type.Click OK.Click Apply.,a,b,c,d,e,f,g,h,Step 3: Set-up for the Analysis (Cont.),Set-up for the AnalysisClick Subcases Select Default for Available Subcases. Default should be selected automatically for Available Load Cases.Click Apply Click Cancel.Click Subcase Select to see that Default is selected under Subcases Selected.Click OK.Click Apply to run MSC.Nastran.,a,b,c,d,f,e,g,e,Step 4: Make MSC.Nastran Results Accessible to MSC.Patran,Make MSC.Nastran results accessible to MSC.Patran.Analysis: Attach XDB/ Result Entities/ Local.Click Select Results FileSelect anchor.xdb.Click OK.Click Apply.,a,b,c,d,e,Step 5: View the Deformation,View the deformation results under Results.Result: Create/Deformation.Select SC1 DEFAULT for Select Result Case(s).Select Displacements, Translational for Select Deformation Result.Click Apply.,a,b,c,d,Step 6: View Only the Deformed Shape,View only the deformed shape.Click Display Attribute. Select Wireframe for Render Style.Deselect Show Undeformed.Click Plot/Erase Icon.Click Erase for Geometry.Click OK.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,Step 7: View the von Mises Stress,View the Von Mises stress results shown on the deformed shape.Results: Create/ Fringe.Select Stress Tensor for Select Fringe Result.Click Display Attribute Icon.Select Element Edges for Display.Click Apply.,a,b,c,d,e,Step 8: Show a Fringe Plot for a Subset of Elements,Show a fringe plot for a subset of the elements.Click Target Entities Icon.Select Elements for Target Entity.See Figure for Select Elements.Click Apply.,a,b,c,d,c,Step 9: Zoom to Higher Stressed Region,Zoom in to see if there are sufficient tet10 elements to represent the stress gradient.Click View Corner Icon.See Figure to select the region. Use Mouse Rotate XY Icon to see the stress more clearly.,a,b,c,c,Change how the Von Mises stress is shown on the elements under Plot Options/ Averaging Definition.Click on Fit view and Iso 3 view icons.Results: Create / Fringe.Select Plot Option Icon.Select None for Domain.Select Derive/Average for Method.For Intra-element (within an element) select Shape Fn. For Extrapolation.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,g,a,Step 11: Use Average Extrapolation Within Each Element,Use average extrapolation to see the difference.Results: Create/Fringe.Select All Entities for Domain/ Averaging Definition.Select Derive/Average for Method.Select Average for Extrapolation for intra-element.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,Step 12: Quit MSC.Patran,Quit MSC.PatranSelect File on the Menu Bar and select Quit from the drop down menu,a,