Enter solution and impose 0.85ˇ¨ of deflection
in the ˇVY direction at the pilot node (n_load).
Activate nonlinear geometry (NLGEOM).
Set ˇ§timeˇ¨ equal to the absolute value of
the imposed displacement.
Set the number of substeps for automatic time
stepping. Try NSUBST, 25, 200, 20. (If you have time you can
experiment with the number of substeps to see how this affects the
convergence behavior of the problem.)
Monitor the reaction force at the pilot node (n_load)
as variable 3 in the monitor file.
Set the output controls to write every substep
to the .rst file (OUTRES).
Solve the problem.
Review the results in the general
postprocessor. Plot the deformed shape, stress results, and contact
pressures.
Plot the force deflection curve in the time
history postprocessor.
Review the output file and the monitor file. At
what point in the solution does the program have difficulty
converging? Why?
If you have time rerun the analysis including
friction. (Set MU = 0.2 for material 1.) Note the convergence
behavior. Does including friction take more or less iterations? Plot
the force deflection curve. What happens to the reaction force
required to compress the seal?
