文稿說明msc.patran courses課程opt

1、WORKSHOP 4SOLID TOPOLOGY OPTIMIZATIONProblem DescriptionA new bracket is being designed. The designer wants to come up with a preliminary design which is stiff and has good load path. The available material envelope is 20” x 10” x 10”. The loading and boundary conditions are show below:110 lb total1

2、23456Suggested Exercise StepsStart MSC.Patran and create a new database bracket.db.Create a solid representing the raw material.Mesh the solid using HEX8 elements.Create boundary conditions.Apply a load at the end edge.Create an steel material with Elastic Modulus of 29e6 and Poisson ratio of 0.3.Cr

3、eate a solid property.Set up and run analysis.Read in optimization resultsPlot the resultsStep 1. Create a DatabaseCreate a new database.File / New.Enter bracket as the file name.Click OK.Choose Default Tolerance.Select MSC.Nastran as the Analysis Code.Select Structural as the Analysis Type. Click O

4、K. abefdcgStep 2. Create geometry for raw materialGeometry: Create / Solid / XYZ.Click on Vector Coordinates List and enter .Apply. abcStep 3. Meshing with Hex8 ElementsElements: Create / Mesh / Solid.Select Elem Shape: Hex.Mesher: IsoMesh.Topology: Hex8.Click on Solid List and select the solid.Ente

5、r a global edge length of 1.Apply.bcdaeStep 4. Create Boundary ConditionCreate a boundary condition on the left face of the bracket as shown.Step 5. Create a forceApply a force of 10 lbs to each node along the lower right edge of the bracket.Step 6. Defining the MaterialCreate a material called “Ste

6、el” with the following properties:Elastic Modulus = 29E6Poisson Ratio = 0.3Density = 0.3 Step 7. Defining Element PropertiesCreate a 2D shell property with a thickness of 6 in.Step 8. Set up and run AnalysisSet up the Topology Optimization RunAnalysis: Optimize / Entire Model / Full Run. Select Cust

7、omized SolutionsSelect Use Customized Solutions. abcStep 8. Set up and run Analysis cont.Click on Design Domain Click on the solid property to send it to the Design Domain belowOK acbStep 8. Set up and run Analysis cont.Click on Objectives_Constraints Select Static AnalysisEnter 0.3 for Mass TargetO

8、KacbadStep 8. Set up and run Analysis cont.Click on Optimization Control Use all defaultsOKOK againacabdStep 8. Set up and run Analysis cont.Click on Subcase SelectClick on the Default subcase to select it.OKApplyabcdStep 9. Read Optimization ResultsImport the results:Tools / Design Study / Post-Pro

9、cessRead Results / Results EntitiesSelect Results FileSelect bracket.desOK.ApplyabcdefStep 10. Display Optimization ResultsDisplay the results:Display Results / Results EntitiesSelect the result case.Enter 0.3 for the threshold.ApplyThis plots the outer surfaces of the remaining elements.abcdStep 10. Display Optimization ResultsSmooth the results:FEM Smooth / Results Entities / 2DSelect the result case.Select all of the elements.ApplyThis creates a new mes