教程5.13g加密所屬

1、WORKSHOP 4Structure Subjected to Enforced Displacement at an inclineWorkshop 4 - Coordinate Systems and ConstraintsUsing the truss model from Workshop 3, change the constraints and add a fourth loading condition.The new constraints will be a “roller” constraint along a 45 degree surface at the right

2、 edge (GRID point 7)In the additional loading condition:Apply a displacement of .05 units normal to the sloped surfaceApply no other loads for this loading conditionIn order to do this, we will need to define a “displacement” coordinate system (CORD2R 100) for GRID 7CORD2R,100,576.,0.,0.,576.,0.,1.,

3、577.,1.,0.Model for Workshop 4New and Modified Case Control and Bulk Data for Workshop 4TITLE = GARAGE ROOF FRAMESUBTITLE = WOOD AND STEEL MEMBERS DISPLACEMENT = ALL SPCFORCES = ALL STRESS = ALL SPC = 10TEMP(INIT) = 20SUBCASE 1 SUBTITLE=TRUSS_LBCS LOAD = 1SUBCASE 20 SUBTITLE = THERMAL LOADTEMP(LOAD)

4、 = 26SUBCASE 30 SUBTITLE = GRAVITY LOAD LOAD = 30SUBCASE 40 SUBTITLE = SUPPORT SETTLING LOAD = 40BEGIN BULKCORD2R,100,576.,0.,0.,576.,0.,1.,577.,1.,0.SPCD,40,7,2,-.05$ modified GRID 7 - displacement coordinate systemGRID 7 576.0 0.0 0.0 100 345 Suggested Exercise Steps:Copy previous PATRAN workshop

5、db file:w3.db to another name called w4.dbOpen the PATRAN database and bring in the w4.dbCreate a new coordinate system, and let GRID 7 uses this coordinate system as for the analysis frame.Create a new loadcase in PATRAN, (fourth loadcase) is called enforced_disp ,copy all the boundary conditions f

6、rom the first loadcase to enforced_disp except the force loading.Create enforced displacement load in the new loadcase Submit the model to MSC.Nastran for analysis.Post-Process results using MSC.Patran.Step 1. Load Case: Create /Load Case Name: enforced_disp Create a new load case: enforced_dispType

7、 in enforced_disp for the Loadcase name.Click on the Assign/Prioritize Load/BCs button to bring up the menu on the far right.Click on the boundary conditions from the top left cornerSelect clamp, dof456, and rightside.Click OK to return to the main material menu.Click Apply.Create a new coordinate s

8、ystemCreate / Coord/ 3Point.Enter 576 0 0 for the Origin Enter 576 0 1 for the point on Axis 3.Enter 577 1 0 for Point on Plane 1-3Click Apply.Step 2. Create Coord: Create/Coord/3Point Modified the grid to use new analysis coordinate frame.Select Coord 1 for the Analysis Coordinate Frame.Click on No

9、de 7Click Apply.Step 3. Finite Element: Modify /Node /Edit Create the enforced displacement loading Enter spcd as the new set name.Click Input Data, ENTER for the translationsPut your cursor inside the Analysis Coordinate Frame box, and select the Coord 1 from the screen.Click OK to close the formCl

10、ick on Select Application region and Changed the selection filter to FEMselect Node 7Click AddClick OKClick Apply.Step 4. Loads/BCs: Create /Displacement /NodalStep 4A: Plot of enforced displacement loading on grid 7 Modified the rightside boundary conditions for the new coord 1 Click rightside as t

11、he new set name.Click Modify Data, Changed the Analysis Coordinate Frame to Coord 1 Click OK to close the formClick on application region and select Node 7Click AddClick OKClick Apply.Step 5. Loads/BCs: Modify/Displacement /NodalStep 5A: Plot of enforced displacement loading on grid 7Step 5. Analysi

12、s: Analyze/ Entire Model/Analysis Deck Submit the model for analysis.Analyze / Entire Model / Analysis Deck.We will have to modified the existing test deckClick on the Solution Type.Select LINEAR STATIC as the Solution Type.Click OK.Click Direct Text input.Step 6. Direct Text Input Case Control Sect

13、ion Direct text inputClick on the button-Case Control Section.Enter TEMP(INIT)=20Click OK.Step 7. Direct Text Input Bulk Data Section Direct text inputClick on Direct Text InputClick the button-Bulk Data Section.Enter TEMPD,20,70.0 Click OK.Click on the Subcase SelectStep 8. Analysis: Subcase Select

14、 Be sure the click the subcases in the following orderClick On the Default from the top menu first.Followed by selecting thermal load, gravity load, and enforced_disp.Click OK.Click Apply.Step 9. : Modified the existing analysis test deck $ Existing translations with PATRAN version 2001$CASE CONTROL

15、 sectionSUBCASE 4$ Subcase name : enforced_disp SUBTITLE=enforced_disp SPC = 2 LOAD = 7 DISPLACEMENT(SORT1,REAL)=ALL SPCFORCES(SORT1,REAL)=ALL STRESS(SORT1,REAL,VONMISES,BILIN)=ALL$ BEGIN BULKLoads for Load Case : enforced_dispSPCADD 2 18 19 20 17Currently there is an translational error in PATRAN v

16、ersion 2001 writing out duplicate SPCADD bulk data entries.In order to correct this , the user needs to modified the bulk data cards as followed.Changed the SPC ID from 2 to 3 in the subcase 4 in the case controlChanged the second SPCADD in the bulk data entries to SPCADD,3,18,19,20,17Use notepad on your PC to open the translated test deck called:w4.bdfAfter editing the files then saved the filename as w4_m.dat.you can submit NASTRAN outside the PATRAN.Step 10. Analysis: Attach XDB/ Result Entities/ Local Attach the XDB result file.Attach XDB / Result Entities / Local.C