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Crank Shaft

Workshop 5

Submodeling

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Workshop Supplement

Octob er 30, 2001Invento ry #001572

W5-2

5. Submodel ing

Crank Shaft

Description

Perform a submodeling analysis on the crank shaft model below.

The submodel will consist of the region around the pin holes.

Full Model Submodel

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Octob er 30, 2001Invento ry #001572

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5. Submodel ing

Crank Shaft

Loads and Material Properties

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5. Submodel ing

Crank Shaft

1. Enter ANSYS in the working directory specified by your instructor using crank-

coarse as the jobname.

2. Resume the crank-coarse.db1 database file:

Utility Menu > File > Resume from

Or issue:

RESUME,crank-coarse,db1

3. Enter POST1 and plot the von Mises stress for the coarse model:

Main Menu > General Postproc > Plot Results > -Contour Plot- Nodal Solu ...

Or issue:

/POST1

PLNSOL,S,EQV

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Octob er 30, 2001Invento ry #001572

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5. Submodel ing

Crank Shaft

4. Change the jobname to crank-fine:

Utility Menu > File > Change Jobname

Or issue:

FINISH

/FILNAME,crank-fine

5. Enter the preprocessor and clear the coarse mesh:

Main Menu > Preprocessor > MeshTool

Or issue:

/PREP7

VCLEAR,ALL

6. Plot the volumes, then do a pairwise intersection of volumes 1, 5, and 4:

Utility Menu > Plot > Volumes

Main Menu > Preprocessor > -Modeling- Operate > -Booleans- Intersect > -Pairwise- Volumes +

Or issue:

VPLOT

VINP,1,5,4

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Octob er 30, 2001Invento ry #001572

W5-6

5. Submodel ing

Crank Shaft

7. Delete volumes 2, 3, and 6 and all entities below volumes 2, 3, and 6:

Main Menu > Preprocessor > -Modeling- Delete > Volume and Below +

Or issue:

VDELE,2,3,1,1

VDELE,6,,1,1

8. Plot areas and then delete areas 29 and 30 and all entities below areas 29 and 30:

Main Menu > Preprocessor > -Modeling- Delete > Area and Below +

Utility Menu > PlotCtrls > Pan, Zoom, Rotate

[Fit]

Or issue:

ADELE,29,30,1,1

/AUTO,1

APLOT

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Octob er 30, 2001Invento ry #001572

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5. Submodel ing

Crank Shaft

9. Clear divisions from all lines:

Main Menu > Preprocessor > MeshTool

Or issue:

LESIZE,ALL,,,-1,,1

10. Plot volumes and then specify an element size of 1 on areas 39, 40, 43, and 44:

Utility Menu > Plot > Volumes

Main Menu > Preprocessor > MeshTool

Or issue:

VPLOT

AESIZE,39,1

AESIZE,40,1

AESIZE,43,1

AESIZE,44,1

11. Mesh volumes 7 and 8 using VSWEEP: Main Menu > Preprocessor > MeshTool

Or issue:

VSWEEP,ALL

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Octob er 30, 2001Invento ry #001572

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5. Submodel ing

Crank Shaft

12. Select the outer surface nodes at a radius of 9 inches:

a) Define a local cylindrical coordinate system at X=0, Y=0, Z=17.5 and rotate 90

degrees about the local Y axis (i.e. THZX=90):

Utility Menu > WorkPlane > Local Coordinate Systems > Create Local CS > At Specified Loc +

Enter 0,0,17.5 in the ANSYS Input window followed by [Enter]

[OK]

KCS = Cylindrical 1

THZX = 90

[OK]

Or issue:

LOCAL,11,1,0,0,17.5,,,90

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5. Submodel ing

Crank Shaft

12. (contd)

b) Select nodes at X=9 and then plot the nodes:

Utility Menu > Select > Entities

Utility Menu > Plot > Nodes

Or issue:

NSEL,S,LOC,X,9

NPLOT

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Octob er 30, 2001Invento ry #001572

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5. Submodel ing

Crank Shaft

13. Write the nodes to a file called crank-fine.node:

Main Menu > Preprocessor > -Modeling- Create > Nodes > Write Node File

Or issue:

NWRITE,crank-fine,node

14. Save the database:

Utility Menu > File > Save as Jobname.db (or pick the SAVE_DB button in the Toolbar)

Or issue:

SAVE

15. Resume the crank-coarse.db1 database file again:

Utility Menu > File > Resume from

Or issue:

RESUME,crank-coarse,db1

16. Enter the general postprocessor and interpolate DOFs:

Main Menu > General Postprocessor > Submodeling > Interpolate DOF

[OK]

Or issue:

/POST1

CBDOF

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5. Submodel ing

Crank Shaft

17. Resume the crank-fine.db database file:

Utility Menu > File > Resume Jobname.db (or pick the RESUM_DB button in the Toolbar)

Or issue:

RESUME,crank-fine,db

18. Select everything and then plot volumes:

Utility Menu > Select > Everything

Utility Menu > Plot > Volumes

Or issue:ALLSEL

VPLOT

19. Enter the solution processor and apply symmetry constraints on areas 40 and 43:

Main Menu > Solution > -Loads- Apply > -Structural- Displacement > -Symmetry B.C.- On Areas +

Or issue:

/SOLU

DA,40,SYMM

DA,43,SYMM

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Octob er 30, 2001

Invento ry #001572

W5-12

5. Submodel ing

Crank Shaft

20. Read in the cut boundary constraints from the crank-fine.cbdo file and then plot

elements: Utility Menu > File > Read Input from

Utility Menu > Plot > Elements

Or issue:

/INPUT,crank-fine,cbdo

EPLOT

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Workshop Supplement

Octob er 30, 2001

Invento ry #001572

W5-13

5. Submodel ing

Crank Shaft

21. Save the database and obtain the submodel solution:

Utility Menu > File > Save as Jobname.db (or pick the SAVE_DB button in the Toolbar)

Main Menu > Solution > -Solve- Current LS

Or issue:

SAVE

SOLVE

22. Turn off the display of the local coordinate system and then save the database:

Utility Menu > PlotCtrls > Symbols Select None for Boundary condition symbol

Set CS = Off under Other Symbols

[OK]

Utility Menu > File > Save as Jobname.db

Or issue:

/PBC,ALL,,0

/PSYMB,CS,0

SAVE

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Workshop Supplement

Octob er 30, 2001

Invento ry #001572

W5-14

5. Submodel ing

Crank Shaft

23. Enter the general postprocessor and plot the von Mises stress for the submodel

model: Main Menu > General Postproc > Plot Results > -Contour Plot- Nodal Solu ...

Or issue:

/POST1

PLNSOL,S,EQV

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Workshop Supplement

Octob er 30, 2001

Invento ry #001572

W5-15

5. Submodel ing

Crank Shaft

24. Plot stresses on the cut boundary and compare with coarse model results (crank-

coarse.db1) in Step 25: Utility Menu > Select > Entities

Main Menu > General Postproc > Plot Results > -Contour Plot-Nodal Solu

Or issue:

NSEL,S,LOC,X,9

ESLN

NSLE

PLNSOL,S,EQV

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Workshop Supplement

Octob er 30, 2001

Invento ry #001572

W5-16

5. Submodel ing

Crank Shaft

25. Resume the crank-coarse.db1 database file and then:

Issue the following commands:

LOCAL,11,1,0,0,17.5,,,90

NSEL,S,LOC,X,8,9

ESLN

NSLE

PLNSOL,S,EQV

26. Exit ANSYS:

Pick the QUIT button inthe Toolbar

Or issue:

FINISH

/EXIT,NOSAVE