WS4-1 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation WORKSHOP 4 SOLID TOPOLOGY OPTIMIZATION

WS4-2 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation

WS4-3 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Problem Description u A 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 total

WS4-4 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Suggested Exercise Steps 1. Start MSC.Patran and create a new database bracket.db. 2. Create a solid representing the raw material. 3. Mesh the solid using HEX8 elements. 4. Create boundary conditions. 5. Apply a load at the end edge. 6. Create an steel material with Elastic Modulus of 29e6 and Poisson ratio of Create a solid property. 8. Set up and run analysis. 9. Read in optimization results 10. Plot the results

WS4-5 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 1. Create a Database Create a new database. a.File / New. b.Enter bracket as the file name. c.Click OK. d.Choose Default Tolerance. e.Select MSC.Nastran as the Analysis Code. f.Select Structural as the Analysis Type. g.Click OK. a b e f d c g

WS4-6 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 2. Create geometry for raw material a.Geometry: Create / Solid / XYZ. b.Click on Vector Coordinates List and enter. c.Apply. a b c

WS4-7 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 3. Meshing with Hex8 Elements a.Elements: Create / Mesh / Solid. b.Select Elem Shape: Hex. Mesher: IsoMesh. Topology: Hex8. c.Click on Solid List and select the solid. d.Enter a global edge length of 1. e.Apply. b c d a e

WS4-8 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 4. Create Boundary Condition Create a boundary condition on the left face of the bracket as shown.

WS4-9 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 5. Create a force Apply a force of 10 lbs to each node along the lower right edge of the bracket.

WS4-10 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 6. Defining the Material Create a material called Steel with the following properties: Elastic Modulus = 29E6 Poisson Ratio = 0.3 Density = 0.3

WS4-11 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 7. Defining Element Properties Create a 2D shell property with a thickness of 6 in.

WS4-12 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 8. Set up and run Analysis Set up the Topology Optimization Run a.Analysis: Optimize / Entire Model / Full Run. b.Select Customized Solutions… c.Select Use Customized Solutions. a b c

WS4-13 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 8. Set up and run Analysis cont. a.Click on Design Domain… b.Click on the solid property to send it to the Design Domain below c.OK a c b

WS4-14 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 8. Set up and run Analysis cont. a.Click on Objectives_Constraints… b.Select Static Analysis c.Enter 0.3 for Mass Target d.OK a c b a d

WS4-15 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 8. Set up and run Analysis cont. a.Click on Optimization Control… b.Use all defaults c.OK d.OK again a c a b d

WS4-16 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 8. Set up and run Analysis cont. a.Click on Subcase Select… b.Click on the Default subcase to select it. c.OK d.Apply a b c d

WS4-17 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 9. Read Optimization Results Import the results: a.Tools / Design Study / Post- Process… b.Read Results / Results Entities c.Select Results File… d.Select bracket.des e.OK. f.Apply a b c d e f

WS4-18 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 10. Display Optimization Results Display the results: a.Display Results / Results Entities b.Select the result case. c.Enter 0.3 for the threshold. d.Apply This plots the outer surfaces of the remaining elements. a b c d

WS4-19 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation Step 10. Display Optimization Results Smooth the results: a.FEM Smooth / Results Entities / 2D b.Select the result case. c.Select all of the elements. d.Apply This creates a new mesh of 3-D elements representing the optimized model. In addition, a backup database may be created that contains the original finite element model. a b c d

WS4-20 PAT328, Workshop 4, May 2005 Copyright 2005 MSC.Software Corporation