Workshop 1 Contact Stiffness

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Presentation transcript:

Workshop 1 Contact Stiffness Planar Seal REFERENCE: Training Manual Contact Stiffness (3-10)

1. Contact Stiffness Planar Seal Purpose Demonstrate the importance of estimating a good starting value for the contact stiffness Goal Impose a displacement controlled loading, solve the contact analysis, and postprocess the results Model Description 2D hyperelastic planer seal 1/2 symmetry Seal compression simulation 1/2 symmetry 0.85 inches applied displacement October 15, 2001 Inventory # 001568 W1-2

1. Contact Stiffness …Planar Seal STEPS TO FOLLOW: 1. Start an ANSYS Interactive session in the working directory specified by the instructor using “seal” as the jobname 2. Resume the SEAL database Utility Menu > File > Resume from Select “seal.db1” [OK] OR enter the following command: RESUME, seal, db1 3. Redirect output to a file Utility Menu > File > Switch output to > File seal.output /OUTPUT, seal, output NOTE: The seal.db1 database contains the completed geometry, material, and boundary condition definitions for this finite element model. October 15, 2001 Inventory # 001568 W1-3

1. Contact Stiffness …Planar Seal 4. View contact pair #1 Main Menu > Preprocessor > Create > Contact Pair > View and Edit … Contact pair real set ID = 1 Select: Contact Pair Options: normals shown [Display] October 15, 2001 Inventory # 001568 W1-4

1. Contact Stiffness …Planar Seal 5. View contact pair #2 Main Menu > Preprocessor > Create > Contact Pair > View and Edit … Contact pair real set ID = 2 Select: Contact Pair Options: normals shown [Display] [Close] October 15, 2001 Inventory # 001568 W1-5

1. Contact Stiffness …Planar Seal 6. Review the normal contact stiffness factor for contact pair #1 via the Contact Wizard Main Menu > Preprocessor > Create > Contact Pair >View and Edit… Select “Set 1” [Edit Settings] [Cancel] [Close] NOTE: For bending-dominated problems, use FKN = 0.1 (default) as a starting estimate. October 15, 2001 Inventory # 001568 W1-6

1. Contact Stiffness …Planar Seal 6. Review the normal contact stiffness factor for contact pair #1 via the Real Constants Main Menu > Preprocessor > Real Constants > Add/Edit/Delete… Select “Set 1” [Edit] Select “Type 3 CONTA171” [Cancel] NOTE: For bending-dominated problems, use FKN = 0.1 as a starting estimate. October 15, 2001 Inventory # 001568 W1-7

1. Contact Stiffness …Planar Seal 7. Review the normal contact stiffness factor for contact pair #2 Main Menu > Preprocessor > Real Constants > Add/Edit/Delete Select “Set 2” [Edit] Select “Type 3 CONTA171” [Cancel] [Close] NOTE: For bending-dominated problems, use FKN = 0.1 as a starting estimate. October 15, 2001 Inventory # 001568 W1-8

1. Contact Stiffness …Planar Seal 8. Apply 0.85 inches displacement in the -Y direction (vertical) Utility Menu > Plot > Elements Main Menu > Solution > Apply > Displacement > On Nodes Select node number 259 [OK] UY Displacement value = -0.85 OR enter the following commands: /SOLUTION D, 259, UY, -0.85 Pick Pilot node (number 259) October 15, 2001 Inventory # 001568 W1-9

1. Contact Stiffness …Planar Seal 9. Specify “Basic” solution control options Main Menu > Solution > Sol’n Control Select tab: “Basic” Analysis Options = Large Displacement Static Time at end of loadstep = 0.85 Number of substeps = 25 Max no. of substeps = 200 Min no. of substeps = 10 All solution items Write every substep [OK] OR enter the following commands: NLGEOM, ON TIME, 0.85 NSUBST, 25, 200, 10 OUTRES, ALL, ALL October 15, 2001 Inventory # 001568 W1-10

1. Contact Stiffness …Planar Seal 10. Monitor the Y direction reaction force Main Menu > Solution > Unabridged Menu > Nonlinear > Monitor Select node number 259 [OK] Variable 3 FY OR enter the following command: MONITOR, 3, 259, FY 11. Solve the contact analysis Main Menu > Solution > Current LS SOLVE Pick node number 259 Note: You will see this error message during solution. Hit OK to continue. We will discuss this at the end. October 15, 2001 Inventory # 001568 W1-11

1. Contact Stiffness …Planar Seal 12. Redirect output to the output window Utility Menu > File > Switch Output to > Output Window OR enter the following command: /OUTPUT, TERM 13. Read the results for the last substep Main Menu > General Postproc > Last Set OR enter the following commands: /POST1 SET, LAST 14. Plot the deformed shape Utility Menu > Plot > Results > Deformed Shape Def shape only [OK] PLDISP October 15, 2001 Inventory # 001568 W1-12

1. Contact Stiffness …Planar Seal 15. Animate the deformed shape Utility Menu > PlotCtrls > Animate > Over Time Use Last Display [OK] OR enter the following command: ANTIME, 10, 0.5, , 1 16. Plot the contact pressure Main Menu > General Postproc > Plot Results > Element Solu Contact Pressure PRES PLESOL, CONT, PRES You need to STOP the animation or CLOSE the Animation Controller before you can issue the next plot command. October 15, 2001 Inventory # 001568 W1-13

1. Contact Stiffness …Planar Seal 17. Plot the equivalent total strain Main Menu > General Postproc > Plot Results > Nodal Solu Strain-total von Mises EPTOEQV [OK] OR enter the following commands: /POST1 PLNSOL, EPTO, EQV October 15, 2001 Inventory # 001568 W1-14

1. Contact Stiffness …Planar Seal 18. Define the reaction force variable Utility Menu > Plot > Elements Main Menu > TimeHist Postpro > Define Variables [Add] Reaction forces [OK] Pick node number 259 User-specified label = FORCE FY [Close] OR enter the following commands: /POST26 RFORCE, 2, 259, F, Y, FORCE Pick node number 259 October 15, 2001 Inventory # 001568 W1-15

1. Contact Stiffness …Planar Seal 19. Graph the load vs. deflection curve Main Menu > TimeHist Postpro > Graph Variables 1st variable to graph = 2 [OK] OR enter the following command: PLVAR, 2 For EXTRA CREDIT, try modifying the graph settings to improve the quality of the graph. October 15, 2001 Inventory # 001568 W1-16

1. Contact Stiffness …Planar Seal 20. Review the contents of the monitor file (seal.mntr). NOTE: Solution control initiated a bisection at 0.73525 inches of deflection (substep 11). October 15, 2001 Inventory # 001568 W1-17

1. Contact Stiffness …Planar Seal 21. Review the contents of the output file (seal.output). Can you now explain the error message during solution? The ERROR occurred after substep 10. Solution control bisected to a smaller load increment at substep 11 in order to prevent the loss of contact for element 303. The deformed shape for loadstep 1, substep 10 is shown. Contact element 304 is highlighted. October 15, 2001 Inventory # 001568 W1-18