Implicit NL 3D

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WS12-1SMX120, Workshop 12, October 2007Copyright 2007 MSC.Software Corporation

CONTACT ANALYSIS USING 3D BOLTS

Workshop 12


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Workshop Objectives To create contact bodies and tables

To create 3D bolts.

To run an implicit nonlinear (Solution 600) analysis.

Problem Description Import a parasolid file containing five 3D unmeshed parts: two

plates to be tightened by three bolts

Define all parts as 3D deformable bodies.

Create a contact table to indicate a contact body pair betweeneach bolt and each plate and between the two plates.

Define 3D bolts

Perform an implicit nonlinear analysis

Evaluate the results

Software Version MSC SimXpert R2.1


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WS12-4SMX120, Workshop 12, September 2007Copyright 2007 MSC.Software Corporation

a

Open MSC SimXpert Structures.

a. Click on Structures.

Step 1. Enter the SimXpert Structures Workspace


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c

b

Set units to mm, kg, s

a. Tools / Options/OptionsEditor.

b. Select Units Manager.

c. Click on Standard Units.

d. Scroll down and select theline with units mm, kg, s.

e. Click OK.

a

Step 2. Set Import Options

d

e


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Step 2. Set Import Options

a

b

c

Set Parasolid import options.

a. Select Parasolid under theI/O Options branch

b. Check Create a part foreach body when importinga subassembly

c. Click OK


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Step 3. Import a Parasolid

a

b

c

Import a Parasolid.

a. Select File / Import /Parasolid

b. Navigate to and selectbolt_geom_v2.xmt_txt.

c. Click Open.


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Step 4. Create a Material

b

c

d

e

Create a Material.

a. In the Model Browser, rightclick Material /New Material

b. Enter Material Name steel.

c. Enter value for YoungsModulus 2e8.

d. Enter value for PoissonsRatio 0.3.

e. Click Ok.

a


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Step 5. Create a Solid Property

b

c

d

e

f

Create a Property for SolidElements

a. In the Model Browser,right click Property /NewProperty

b. Select 3D for PropertyCategory and Simple forProperty Group.

c. Select Property Type as

Linear Solid.d. Check the MID checkbox

then click in the text box

e. Select steel from theModel Browser.

f. Click Ok.

a


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Step 6. Rename Parts

a

b

c e

d

Apply Properties and renameparts.

a. Double Click on Part P1 inModel Browser underASSY2.

b. Change the Title (partname) to plate_bottom

c. Click Modify.

d. Repeat steps a thru c for

the remaining parts: P2,P3, P4, P5 renaming themplate_top, bolt_1, bolt_3and bolt_2, respectively.

e. Click Exit


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Step 7. Create a Mesh For the Plates

a

b

d

e

f

c

Create a Solid Mesh for the plates.

a. Select FE Modeling / Mesh /Create /On Part

b. Pull down Mesh Type Solid.

c. Click in the Body to Meshtext box and select the topand bottom plates bypicking them in the window

d. Enter 100 for element size.

e. Click in the Element Propertytext box and select theproperty PSOLID_1 from theModel Browser

f. Select Quadratic.

g. Click Apply.

c

g


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Step 8. Create a Mesh For the Bolts

d

b

c

a

a

Create a finer mesh on the bolts.

a. Click in the Body to Meshtext box and select the 3bolts by picking them inthe window.

b. Enter 50 for Element Size.

c. Make sure the ElementProperty text box still listsPSOLID_1 and thatQuadratic is still selected.

d. Click OK.


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Step 9. Create Contact Bodies

a

bc

d

e

Create 3D Deformable Bodies. Ifthe Contact toolbox is notdisplayed, right click next to thetoolboxes and make sureContact is checked.

a. Select Contact / Deformable /Deformable Solid.

b. On the pick panel, selectPart(s) for 3D.

c. Enter Contact Body NameBottom_Plate.

d. Select plate_bottom from themodel browser.

e. Click Create.

f. Repeat steps a thru e for: Top_Plate

Bolt_1 Bolt_3

Bolt_2


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Step 10. Create Contact Table

a

Define 7 Possible Contact BodyPairs.

a. Select Contact / ContactTable /BCTABLE.

b. Select Deact. Diagonal toeliminate self-contact.

c. Since the bolts will not comeinto contact with each other,in row 1 (bolt_1) clear

columns 2 and 3 byrepeatedly clicking in eachbox until it is blank. In row 2(bolt_2) clear column 3 byclicking in the box until it isblank.

d. Click Create.

e. Click Exit.

b

c

d e


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Step 11. Apply Constraints

a

b

c

e

g

h

Apply Constraints.

a. In the Model Browser, rightclick LBC /New LBC

b. For BC Type select SPC BC

c. For BC Sub-Type selectSPC1

d. Uncheck Dof 4, Dof 5, andDof 6.

e. Click in the Pick Entitiestext box

f. Change the pick filter toSurfaces on the GeneralPicking toolbar.

g. Select the outer faces ofboth the top and bottomplates.

h. Click Ok.

d

f


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Step 11. Apply Constraints (Cont.)

bc

a

e

f

i

h

Constrain rigid body motion of the

bolts

a. In the Model Browser, rightclick LBC /New LBC.

b. For BC Type select SPC BC.

c. For BC Sub-Type selectSPC1.

d. For Name, enter X_and_Y.

e. Deselect Dof 3, Dof 4, Dof5, and Dof 6.

f. Click in the PickEntities.text box

g. Select surface as the pickingfilter as on the previous slide.

h. Click on the top surface ofeach bolt.

i. Click Ok.

d


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Step 12. Create 3D bolts.

b

e

f

h

c

g

Create 3D Bolts with a 5 unitpreload.

a.Select Utilities / Bolt Model /Create /3D.

b.Enter 5 for displacement.c.Select Parts.

d.Select bolt_1 from theModel Browser tree underASSY2.

e.Click Done.

f.Repeat steps d and e for

bolt_2 and bolt_3.g.As the bolts are created, alocal coordinate system isdisplayed on the part.

h.Click Exit.

d

a


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Step 13. Setup Analysis

c

d

e

a

Specify analysis parameters.

a. Expand Analysis asnecessary.

b. Right click on NastranJobs and click CreateNew Job.

c. Enter 3D_Bolt as the JobName.

d. Select Implicit NonLinear

(SOL600).e. Click OK.

b


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WS12-19

SMX120, Workshop 12, September 2007

Copyright 2007 MSC.Software Corporation

Step 13. Setup Analysis (Cont.)

g

h

f

Specify analysis parameters

(continued).

f. Right click Cases andselect Add Subcase.

g. Select DefaultLbcSetunder Select LBC Set.

h. Click OK.


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Step 13. Setup Analysis (Cont.)

i

j

k

Specify analysis parameters

(continued).

i. Right click on SubcaseDefaultLbcSet and selectSelect Contact Table.

j. Select BCTABLE_1.

k. Click Ok.


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Step 14. Run the Analysis

b c

Run Analysis

a. Right click on 3D_Bolt,select Run.

b. Select a location for theanalysis input file. Give itthe name 3D_Bolt

c. Click Save.

a


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Step 17. Attach the Results

a

b c

Attach the .xdb file to access theanalysis results.

a. Select File/Attach Results /Results Entities.

b. Navigate to and select thefile 3d_bolt.xdb

c. Click Open.


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Step 18. Results Plot-Deformation Fringe Plot

Deformation Fringe Plot.a. Select Result/State Plot.b. Select Plot Type Fringe.c. Select Results Case Time

= 1.

d. Select Results TypeDisplacements,Translational.

e. Select DerivationMagnitude.

f. Click Update to generate aFringe Plot showingdeformation concentrated

in the bolts.g. In order to be able to see

the fringe plot clearly turnoff all Geometry andBoundary Conditions

h. Click Clear when finished.i. Turn off 3D elements.

b

c

a

ef

d

h

gi


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Step 19. Results Plot-Stress Fringe Plot

Generate a Stress Fringe Plot

a. Change Result type toStress Tensor.

b. Derivation: von Mises

c. Click Update.

bc

a


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Step 20. Clip the Model

Clip the model to show thestresses inside the bolt.

a. Select Utilities / ModelClipping.

b. Select XYZ on the PickPanel as the method toenter 3 points to define a

clipping plane.c. Enter 0 0 0.

d. Click OK.

e. Now enter:0 0 1 click OK0 1 1 click OK

f. Enter Incremental

Distance: 100 for theamount to translate theplane

g. Click OK.

h. Click Add.

i. Click Sub.

b

c

a

f

d

h

g

i

e


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Step 20. Clip the Model

Rotate the Model to view the fringeresults inside the bolts.

Implicit NL 3D

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