WORKSHOP 10 SUPPORT BRACKET

WS10-2 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation

WS10-3 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation l Workshop Objectives l Import a parasolid part l Mesh the part using TET 4 elements l Re-mesh the part using TET 10 elements l Evaluate the averaged and un-averaged stress results

WS10-4 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation l Problem Description l A bracket is constructed from titanium alloy Ti-6Al-4V with the following properties: E = 16 x 10 6 psi =0.31 l A pressure load of 100 psi is applied to the top face of the support bracket. l The bracket is attached with two bolts. l Model the bracket with tetrahedron elements.

WS10-5 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation l Suggested Exercise Steps 1. Create a new database and name it bracket_tet4.db. 2. Import the parasolid part file support_bracket.xmt. 3. Mesh the part using TET4 elements. Use a global edge length of in. 4. Create material and element properties. 5. Constrain the two cylindrical holes to react shear loads (x and y translations). 6. Constrain the back face to react z loads (z translation). 7. Apply 100 psi to the top bracket face. 8. Run the finite element analysis using MSC.Nastran. 9. Plot displacements and stresses (averaged, un-averaged, and difference). 10. File / save a copy as bracket_tet10.db. 11. Close the database and open the bracket_tet10 database. 12. Delete the original results file. 13. Re-mesh the part with TET10 elements. Use a global edge length of in. 14. Re-run the analysis. 15. Attach the new results file to the database. 16. Plot displacements and stresses (averaged, un-averaged, and difference). 17. Compare the TET10 model results with the TET4 model results. 18. If time permits, re-mesh the model with TET10 elements using a global edge length of and run the analysis. This finer mesh will generate more accurate stress results than the previous two models.

WS10-6 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation b c d f g Step 1. Create New Database Create a new database called bracket_tet4. db a.File / New. b.Enter bracket_tet4 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 e

WS10-7 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 2. Import Parasolid File Import the Parasolid File a.File: Import. b.Set the object to model and the source to Parasolid.xmt. c.Select support_bracket.xmt. d.Click Apply. e.Click OK to Parasolid Transmit File Import Summary a b c d

WS10-8 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 3. Create Mesh Create a solid mesh a.Elements: Create / Mesh / Solid. b.Set the topology to TET4. c.Select the entire solid. d.Enter for the Global Edge Length. e.Click Apply. a b c d e

WS10-9 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 4. Create Material and Element Properties Create an isotropic material a.Materials: Create / Isotropic / Manual Input. b.Enter Ti-6Al-4V as the Material Name. c.Click Input Properties. d.Enter 16e6 for the Elastic Modulus and 0.31 for the Poisson Ratio. e.Click OK. f.Click Apply. d e a c b f

WS10-10 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 4. Create Material and Element Properties Create element properties a.Properties: Create / 3D / Solid. b.Enter bracket_prop as the Property Set Name. c.Click Input Properties. d.Click on the Select Material Icon. e.Select Ti-6Al-4V as the material. f.Click OK. f e d a b c

WS10-11 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Apply the element properties a.Click in the Select Members box. b.Rectangular pick all elements as shown. c.Click Add. d.Click Apply. b Step 4. Create Material and Element Properties a c d

WS10-12 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 5. Constrain Bolt Holes Create a boundary condition a.Loads/BCs: Create / Displacement / Nodal. b.Enter bolt_hole as the New Set Name. c.Click Input Data. d.Enter for Translations e.Click OK. d e b c a

WS10-13 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Apply the boundary condition a.Click Select Application Region. b.For the Geometry Filter select Geometry. c.Click on Iso 2 View Icon. d.Click on the Smooth Shaded View Icon. e.Set the Selection Filter to Surface or Face and shift click to select the surfaces of both bolt holes. f.Click Add. g.Click OK. h.Click Apply. Step 5. Constrain Bolt Holes g f b c d e a h

WS10-14 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 6. Constrain the Back Face Create a boundary condition a.Loads/BCs: Create / Displacement / Nodal. b.Enter back_face as the New Set Name. c.Click Input Data. d.Enter for Translations e.Click OK. d e a b c

WS10-15 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Apply the boundary condition a.Click Select Application Region. b.For the Geometry Filter select Geometry. c.Select the Back Face. d.Click Add. e.Click OK. f.Click Apply. a e f d b c d Step 6. Constrain the Back Face

WS10-16 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 7. Create Pressure Load Create the pressure load a.Loads/BCs: Create / Pressure / Element Uniform. b.Enter top_pressure as the New Set Name. c.Click Input Data. d.Enter 100 for the Pressure. e.Click OK. e d a b c

WS10-17 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Apply the pressure load a.Click Select Application Region. b.For the Geometry Filter select Geometry. c.Select the top surface of the bracket. d.Click Add. e.Click OK. f.Click Apply. Step 7. Create Pressure Load b d e c a f

WS10-18 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 8. Run Linear Static Analysis Analyze the model a.Analysis: Analyze / Entire Model / Full Run. b.Click Solution Type. c.Choose Linear Static. d.Click OK. e.Click Apply. d c a e b

WS10-19 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 9. Plot Displacements and Stresses Attach the results file a.Analysis: Access Results / Attach XDB / Result Entities. b.Click Select Results File. c.Choose the results file bracket_tet4.xdb. d.Click OK. e.Click Apply. a b c e d

WS10-20 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 9. Plot Displacements and Stresses Create a quick plot a.Results: Create / Quick Plot. b.Select Stress Tensor as the Fringe Result. c.Select Von Mises as the Fringe Result Quantity. d.Select Displacements, Translational as the Deformation Result. e.Click Apply. Maximum Averaged Stress: __________________ Maximum Displacement: ___________________ a d c e b

WS10-21 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 9. Plot Displacements and Stresses Create a fringe plot a.Results: Create / Fringe. b.Select Stress Tensor as the Fringe Result. c.Select Von Mises as the Fringe Result Quantity. d.Click on the Plot Options Icon. e.Set the Averaging domain to none. f.Click Apply. a d c b Maximum Un-averaged Stress: __________________ e f

WS10-22 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 9. Plot Displacements and Stresses Create a fringe plot a.Results: Create / Fringe. b.Select the Plot Options tool. c.Set the Averaging domain to All Entities and the Method to Difference. d.Click Apply. Maximum Stress Difference: _________________ a d c b

WS10-23 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 10. Save a Copy Save a copy of the file a.File: Save a Copy. b.Type bracket_tet10 as the file name. c.Click Save. a b c

WS10-24 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 11. Open the New Database Close the original file and open the new file a.File: Close. b.File: Open. c.Select the file: bracket_tet10.db. d.Click OK. a b c d

WS10-25 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 12. Delete Old Results File Delete XDB attachment a.Analysis: Delete / XDB Attachment. b.Select the bracket_tet4. xdb attachment c.Click Apply. d.Choose Yes to delete the attachment. a b c d

WS10-26 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 13. Re-Mesh the Part Create a solid mesh a.Elements: Create / Mesh / Solid. b.Set the topology to TET10. c.Select the entire solid. d.Enter for the Global Edge Length. e.Click Apply. f.Choose Yes to delete the existing mesh. f a b c d e

WS10-27 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 14. Run Linear Static Analysis Analyze the model a.Analysis: Analyze / Entire Model / Full Run. b.Change the job name to bracket_tet10. c.Click Apply. a b c

WS10-28 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 15. Attach New Results File Attach the results file a.Analysis: Access Results / Attach XDB / Result Entities. b.Click Select Results File. c.Choose the results file bracket_tet10.xdb. d.Click OK. e.Click Apply. a b c e d

WS10-29 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 16. Plot Displacements and Stresses Create a quick plot a.Results: Create / Quick Plot. b.Select Stress Tensor as the Fringe Result. c.Select Von Mises as the Fringe Result Quantity. d.Select Displacements, Translational as the Deformation Result. e.Click Apply. Maximum Averaged Stress: __________________ Maximum Displacement: ___________________ c a d c e b

WS10-30 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 16. Plot Displacements and Stresses Create a fringe plot a.Results: Create / Fringe. b.Select Stress Tensor as the Fringe Result. c.Select Von Mises as the Fringe Result Quantity. d.Click on the Plot Options Icon. e.Set the Averaging domain to none. f.Click Apply. Maximum Un-averaged Stress: __________________ a d c b e f

WS10-31 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation Step 16. Plot Displacements and Stresses Maximum Stress Difference: __________________ Create a fringe plot a.Results: Create / Fringe. b.Select the Plot Options tool. c.Set the Averaging domain to All Entities and the Method to Difference. d.Click Apply. a d c b

WS10-32 NAS120, Workshop 10, May 2006 Copyright 2005 MSC.Software Corporation