Workshop 7B-1 NAS101 Workshops Copyright  2001 MSC.Software Corporation WORKSHOP 7B Structure With Spring Support

Workshop 7B-2 NAS101 Workshops Copyright  2001 MSC.Software Corporation Workshop 7B (cont.) 1.For this workshop, let us represent the right support on the truss as a spring 2.We will start with the model from Workshop 3 (3 loading conditions) 3.Remove the constraint on GRID 7 4.Add an additional GRID point (GRID 700) coincident to GRID 7 5.Constrain this new GRID to have 0.0 displacements 6.Connect GRID 7 to GRID 700 with a y-direction spring with a stiffness of 10,000 lb/in

Workshop 7B-3 NAS101 Workshops Copyright  2001 MSC.Software Corporation Solution for Workshop 7B

Workshop 7B-4 NAS101 Workshops Copyright  2001 MSC.Software Corporation Solution for Workshop 7B (cont.)

Workshop 7B-5 NAS101 Workshops Copyright  2001 MSC.Software Corporation Structure with spring support Figure 1-1

Workshop 7B-6 NAS101 Workshops Copyright  2001 MSC.Software Corporation n Suggested Exercise Steps: 1. Copy previous PATRAN workshop db file:w3.db to another name called w7b.db 2. Open the PATRAN database and bring in the w7b.db 3. Create a duplicate grid 700 at same location as grid 7 4. Create a CBUSH element between grid 7 and Constrain grid 700 in dof Add this new constraint to all load cases 7. Delete the constraints called rightside from all the load cases;default, thermal load,and gravity load. 8. Submit the model to MSC.Nastran for analysis. 9. Post-Process results using MSC.Patran.

Workshop 7B-7 NAS101 Workshops Copyright  2001 MSC.Software Corporation a.Create/Node/Edit b.Go to the Node ID list and put in 700 c.Uncheck the box on Associate with Geometry d.Select Node 7 from the screen or type in node 7 e.Click APPLY Step 1. Finite Element: Create /Node /Edit

Workshop 7B-8 NAS101 Workshops Copyright  2001 MSC.Software Corporation a.Create /Element/ Edit b.Go to the Element ID list box and type in 100 c.Click on node 7 from the screen for Node 1 and node 700 for Node 2 d.Click APPLY Step 2. Finite Element: Create /Element /Edit Please note that since node 7 and node 700 are coincidence,and therefore it is easier just to type in node 7 and node 700 in the box instead from picking from the screen.

Workshop 7B-9 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 3. Element Properties: Create /1D/ Bush Create the element properties. a.Create / 1D / Bush. b.Enter bush as the Property Set Name. c.Click on the Input Properties button. d.Change the value Type to CID on the right side of Bush Orientation box e.Click on the Coord 0 from the screen in the Bush Orientation box.This is the global basic coordinate system. f.Enter 0 for the Spring Constant 1 g.Enter for the Spring Constant 2 h.Click OK. i.Select element 100 for the Application Region.(pick the element icon) j.Click Add. k.Click Apply.

Workshop 7B-10 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 4. Loads/BCs: Create/ Displacement/Nodal Constraint grid 700 in dof a.Create / Displacement / Nodal. b.Type in bush for the new set name c.Click on the Input Data. d.Enter for both translations and the Rotations field. e.Click OK. f.Click on Select Application Region button. g.Select FEM as the geometry filter.. h.Select Node 700 for the Application Region. i.Click Add. j.Click OK. k.Click Apply.

Workshop 7B-11 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 5. Load Case: Modify /Load Case Name: Default Modify load case: Default a.Click on the Assign/Prioritize Load/BCs button to bring up the menu on the far right. b.Highlight the rightside and click on Removed Selected Rows. c.Click on the Displ_bush from the top left corner and add it to the existing load case. d.Click OK to close the menu e.Click Apply.

Workshop 7B-12 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 6. Load Case: Modify /Load Case Name: Thermal and gravity load Repeat previous step for the load case called thermal load, and gravity load. a.Click on the Assign/Prioritize Load/BCs button to bring up the menu on the far right. b.Highlight the rightside and click on Removed Selected Rows. c.Click on the Displ_bush from the top left corner and add it to the existing load case. d. Click OK to close the menu e.Click Apply.

Workshop 7B-13 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 7. Analysis: Analyze/ Entire Model/Full Run Submit the model for analysis. a.Analyze / Entire Model / Full Run. b.Click on the Solution Type. c.Select LINEAR STATIC as the Solution Type. d.Click OK. e.Click Direct Text input.

Workshop 7B-14 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 8. Direct Text Input – Case Control Section Direct text input a.Click on the button-Case Control Section. b.Enter TEMP(INIT)=20 c.Click OK.

Workshop 7B-15 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 9. Direct Text Input – Bulk Data Section Direct text input a.Click the button-Bulk Data Section. b.Enter TEMPD,20,70.0 c.Click OK. d.Click on the Subcase Select

Workshop 7B-16 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 10. Analysis: Subcase Select Be sure the click the subcases in the following order a.Click On the Default from the top menu first. b.Followed by selecting thermal load, and then gravity load. c.Click OK. d.Click Apply.

Workshop 7B-17 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 11. Analysis: Attach XDB/ Result Entities/ Local Attach the XDB result file. a.Attach XDB / Result Entities / Local. b.Click on Select Result File. c.Select the file called w7b.xdb d.Click OK. e.Click Apply.

Workshop 7B-18 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 12. Results: Create/Quick Plot Create a Quick Plot of the results. a.Create / Quick Plot. b.Select SC1 result case. c.Select Displacement, Translational for the Deformation Result. d.Click Apply. Note that if you have previous results from workshop3, then you will see additional 3 result cases for this run label as A2

Workshop 7B-19 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 13. Results: Create/Quick Plot Create a Quick Plot of the results. a.Create / Quick Plot. b.Select SC2 result case. c.Select Displacement, Translational for the Deformation Result. d.Click Apply.

Workshop 7B-20 NAS101 Workshops Copyright  2001 MSC.Software Corporation Step 14. Results: Create/Quick Plot Create a Quick Plot of the results. a.Create / Quick Plot. b.Select SC3 result case. c.Select Displacement, Translational for the Deformation Result. d.Click Apply.