Transcript Swaybar-Shaft Assembly

Workshop 8
Bonded Contact
Swaybar-Shaft Assembly
8. Bonded Contact
Swaybar-Shaft Assembly
Workshop Supplement
•
A swaybar-shaft assembly is subjected to a vertical force of 500 kgf at the
right end of the swaybar. The objective is to determine the overall
stresses in the assembly.
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Use bonded contact to simulate the assembly, and replace the right twothirds of the swaybar with a "rigid region" (constraint equations).
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As a follow-up, join the two parts using a Boolean glue operation and redo
the analysis.
INTRODUCTION TO ANSYS 6.0 - Part 2
Description
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8. Bonded Contact
Swaybar-Shaft Assembly
INTRODUCTION TO ANSYS 6.0 - Part 2
Loads and Material Properties
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8. Bonded Contact
Swaybar-Shaft Assembly
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Enter ANSYS in the working directory specified by your instructor using “bondedcontact” as the jobname.
2.
Read input from the file “bonded-contact.inp” to 1) mesh the model, 2) create rigid
links, and 3) apply constraints and loads:
–
–
Utility Menu > File > Read Input from …
Or issue:
/INP,bonded-contact,inp
3.
Create the bonded contact elements between the shaft and the swaybar:
Procedure shown on
following pages
INTRODUCTION TO ANSYS 6.0 - Part 2
1.
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8. Bonded Contact
Swaybar-Shaft Assembly
(cont’d)
a) Create the contact elements:
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Main Menu > Preprocessor > -Modeling- Create > Contact Pair > Contact Wizard …
• Select “Flexible” and “Areas”, then [Pick Target …]
• Pick area 48, then [OK]
HINT: drag mouse until Area 48 is selected or
type 48 into the input window, then Enter
For ambiguous pick, hit NEXT until “48” is selected
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Pick [Next >]
Select “Areas”, then [Pick Contact …]
Pick area 22, then [OK]
Pick [Next >]
Pick [Optional settings …]
Set the “Normal Penalty Stiffness” to 100
Select “Bonded (always)” for
Behavior of contact surface
Select the “Initial Adjustment” tab
Select “Exclude everything” for
Initial penetration
[OK]
[Create >]
[Finish]
INTRODUCTION TO ANSYS 6.0 - Part 2
3.
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8. Bonded Contact
Swaybar-Shaft Assembly
(cont’d)
b) select type 5 elements and their nodes and then plot the target surface contact
elements:
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Utility Menu > Select > Entities ...
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Main Menu > Preprocessor > -Modeling- Create > Contact Pair > View Pair …
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–
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Select “Target Surface” and check “normals shown” under Options
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[Display]
Utility Menu > Plot > Elements
Or issue:
ESEL,S,TYPE,,5
NSLE
/PSYMB,ESYS,1
/PNUM,TYPE,1
EPLOT
INTRODUCTION TO ANSYS 6.0 - Part 2
3.
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8. Bonded Contact
Swaybar-Shaft Assembly
(cont’d)
c) Select type 6 elements and their nodes and then plot the contact surface contact
elements:
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Utility Menu > Select > Entities ...
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Main Menu > Preprocessor > -Modeling- Create > Contact Pair > View Pair …
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–
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Select “Contact Surface” and check “normals shown” under Options
•
[Display]
Utility Menu > Plot > Elements
Or issue:
ESEL,S,TYPE,,6
NSLE
/PSYMB,ESYS,1
/PNUM,TYPE,1
EPLOT
d) Close the “View Contact Pair…” window
•
[Close]
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8. Bonded Contact
Swaybar-Shaft Assembly
Select everything, turn off all symbols except constraint equations, then plot
elements:
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Utility Menu > Select > Everything
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Utility Menu > PlotCtrls >Symbols > For Individual : Miscellaneous > Constraint Equations
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Utility Menu > Plot > Elements
Or issue:
ALLSEL
/PBC,CE, ,1
/AUTO,1
EPLOT
INTRODUCTION TO ANSYS 6.0 - Part 2
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8. Bonded Contact
Swaybar-Shaft Assembly
Enter the solution processor and turn off solution controls. Then choose the PCG
solver, set the number of equilibrium iterations to one, and solve:
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Main Menu > Solution > Unabridged Menu
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Main Menu > Solution > -Load Step Opts- Solution Ctrl ..
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Set to “Off”, then [OK]
Main Menu > Solution > -Analysis Type- Sol’n Control ...
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Pick the “Sol’n Options” tab
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Select “Pre-Condition CG”
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Pick the “Nonlinear” tab
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Enter “1” for the number of Equilibrium Iterations
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[OK]
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Read and then close yellow warning message window
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Pick the “SAVE_DB” button in the Toolbar
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Main Menu > Solution > -Solve- Current LS
Or issue:
/SOLU
SOLCONTROL,OFF
EQSLV,PCG
NEQIT,1
SAVE
(or select: Utility Menu > File > Save as Jobname.db)
INTRODUCTION TO ANSYS 6.0 - Part 2
5.
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SOLVE
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Swaybar-Shaft Assembly
Unselect element 8000 (MASS21 element), then enter POST1 and plot the nodal von
Mises stresses:
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Utility Menu > Select > Entities ...
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Main Menu > General Postproc > Plot Results > -Contour Plot- Nodal Solu ...
Or issue:
ESEL,U,,,8000
/POST1
/AUTO,1
PLNSOL,S,EQV
INTRODUCTION TO ANSYS 6.0 - Part 2
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8. Bonded Contact
Swaybar-Shaft Assembly
Plot von Mises stresses for elements associated with volume component “v_bar”:
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Utility Menu > Select > Comp/Assembly > Select Comp/Assembly …
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Utility Menu > Select > Everything Below > Selected Volumes
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Main Menu > General Postproc > Plot Results > -Contour Plot- Nodal Solu ...
Or issue:
CMSEL,S,v_bar
ALLSEL,BELOW,VOLU
PLNSOL,S,EQV
INTRODUCTION TO ANSYS 6.0 - Part 2
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8. Bonded Contact
Swaybar-Shaft Assembly
Plot von Mises stresses for elements associated with volume component “v_shaft”:
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Utility Menu > Select > Comp/Assembly > Select Comp/Assembly …
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Utility Menu > Select > Everything Below > Selected Volumes
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Main Menu > General Postproc > Plot Results > -Contour Plot- Nodal Solu ...
Or issue:
CMSEL,S,v_shaft
ALLSEL,BELOW,VOLU
PLNSOL,S,EQV
INTRODUCTION TO ANSYS 6.0 - Part 2
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8. Bonded Contact
Swaybar-Shaft Assembly
Now rerun the stress analysis, with the swaybar and shaft volumes glued together, by
reading input from the file “swaybar-shaft-glued.inp”:
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Utility Menu > File > Read Input from …
Or issue:
/INP,swaybar-shaft-glued,inp
10. After the solution completes, the nodal solution for SEQV is displayed for the
swaybar (i.e. v_bar volume component):
INTRODUCTION TO ANSYS 6.0 - Part 2
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8. Bonded Contact
Swaybar-Shaft Assembly
Workshop Supplement
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Utility Menu > Select > Comp/Assembly > Select Comp/Assembly …
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Utility Menu > Select > Everything Below > Selected Volumes
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Main Menu > General Postproc > Plot Results > -Contour Plot- Nodal Solu ...
Or issue:
CMSEL,S,v_shaft
ALLSEL,BELOW,VOLU
PLNSOL,S,EQV
12. Exit ANSYS.
INTRODUCTION TO ANSYS 6.0 - Part 2
11. Plot von Mises stresses for elements associated with volume component “v_shaft”:
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