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Swaybar-Shaft Assembly

Workshop 8 Bonded Contact. Swaybar-Shaft Assembly. 8. Bonded Contact Swaybar-Shaft Assembly. Description 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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Swaybar-Shaft Assembly

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  1. Workshop 8 Bonded Contact Swaybar-Shaft Assembly

  2. 8. Bonded Contact Swaybar-Shaft Assembly Description • 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. • Use bonded contact to simulate the assembly, and replace the right two-thirds of the swaybar with a "rigid region" (constraint equations). • As a follow-up, join the two parts using a Boolean glue operation and redo the analysis. October 30, 2001 Inventory #001572 W8-2

  3. 8. Bonded ContactSwaybar-Shaft Assembly Loads and Material Properties October 30, 2001 Inventory #001572 W8-3

  4. 8. Bonded ContactSwaybar-Shaft Assembly 1. Enter ANSYS in the working directory specified by your instructor using “bonded-contact” 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 October 30, 2001 Inventory #001572 W8-4

  5. 8. Bonded ContactSwaybar-Shaft Assembly 3. (cont’d) a) Create the contact elements: • 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 • 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] October 30, 2001 Inventory #001572 W8-5

  6. 8. Bonded ContactSwaybar-Shaft Assembly 3. (cont’d) b) select type 5 elements and their nodes and then plot the target surface contact elements: • Utility Menu > Select > Entities ... • Main Menu > Preprocessor > -Modeling- Create > Contact Pair > View Pair … • Select “Target Surface” and check “normals shown” under Options • [Display] • Utility Menu > Plot > Elements • Or issue: ESEL,S,TYPE,,5 NSLE /PSYMB,ESYS,1 /PNUM,TYPE,1 EPLOT October 30, 2001 Inventory #001572 W8-6

  7. 8. Bonded ContactSwaybar-Shaft Assembly 3. (cont’d) c) Select type 6 elements and their nodes and then plot the contact surface contact elements: • Utility Menu > Select > Entities ... • Main Menu > Preprocessor > -Modeling- Create > Contact Pair > View Pair … • 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] October 30, 2001 Inventory #001572 W8-7

  8. 8. Bonded ContactSwaybar-Shaft Assembly 4. Select everything, turn off all symbols except constraint equations, then plot elements: • Utility Menu > Select > Everything • Utility Menu > PlotCtrls >Symbols > For Individual : Miscellaneous > Constraint Equations • Utility Menu > Plot > Elements • Or issue: ALLSEL /PBC,CE, ,1 /AUTO,1 EPLOT October 30, 2001 Inventory #001572 W8-8

  9. 8. Bonded ContactSwaybar-Shaft Assembly 5. Enter the solution processor and turn off solution controls. Then choose the PCG solver, set the number of equilibrium iterations to one, and solve: • Main Menu > Solution > Unabridged Menu • Main Menu > Solution > -Load Step Opts- Solution Ctrl .. • Set to “Off”, then [OK] • Main Menu > Solution > -Analysis Type- Sol’n Control ... • Pick the “Sol’n Options” tab • Select “Pre-Condition CG” • Pick the “Nonlinear” tab • Enter “1” for the number of Equilibrium Iterations • [OK] • Read and then close yellow warning message window • Pick the “SAVE_DB” button in the Toolbar (or select: Utility Menu > File > Save as Jobname.db) • Main Menu > Solution > -Solve- Current LS • Or issue: /SOLU SOLCONTROL,OFF EQSLV,PCG NEQIT,1 SAVE SOLVE October 30, 2001 Inventory #001572 W8-9

  10. 8. Bonded ContactSwaybar-Shaft Assembly 6. Unselect element 8000 (MASS21 element), then enter POST1 and plot the nodal von Mises stresses: • Utility Menu > Select > Entities ... • Main Menu > General Postproc > Plot Results > -Contour Plot- Nodal Solu ... • Or issue: ESEL,U,,,8000 /POST1 /AUTO,1 PLNSOL,S,EQV October 30, 2001 Inventory #001572 W8-10

  11. 8. Bonded ContactSwaybar-Shaft Assembly 7. Plot von Mises stresses for elements associated with volume component “v_bar”: • Utility Menu > Select > Comp/Assembly > Select Comp/Assembly … • Utility Menu > Select > Everything Below > Selected Volumes • Main Menu > General Postproc > Plot Results > -Contour Plot- Nodal Solu ... • Or issue: CMSEL,S,v_bar ALLSEL,BELOW,VOLU PLNSOL,S,EQV October 30, 2001 Inventory #001572 W8-11

  12. 8. Bonded ContactSwaybar-Shaft Assembly 8. Plot von Mises stresses for elements associated with volume component “v_shaft”: • Utility Menu > Select > Comp/Assembly > Select Comp/Assembly … • Utility Menu > Select > Everything Below > Selected Volumes • Main Menu > General Postproc > Plot Results > -Contour Plot- Nodal Solu ... • Or issue: CMSEL,S,v_shaft ALLSEL,BELOW,VOLU PLNSOL,S,EQV October 30, 2001 Inventory #001572 W8-12

  13. 8. Bonded ContactSwaybar-Shaft Assembly 9. Now rerun the stress analysis, with the swaybar and shaft volumes glued together, by reading input from the file “swaybar-shaft-glued.inp”: • 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): October 30, 2001 Inventory #001572 W8-13

  14. 8. Bonded ContactSwaybar-Shaft Assembly 11. Plot von Mises stresses for elements associated with volume component “v_shaft”: • Utility Menu > Select > Comp/Assembly > Select Comp/Assembly … • Utility Menu > Select > Everything Below > Selected Volumes • 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. October 30, 2001 Inventory #001572 W8-14

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