Reply To: Spring and ball style check valve transient vibration

[dlooman]

Can't explain why you are getting zero contact force in certain scenarios, but a typical approach would be two load steps.  In load step 1 the preload is applied with time-integration off.  A displacement boundary condition can be zero in load step 1 and then non-zero in load step 2 with time integration on.  You also mention harmonic input.  Are you doing a Harmonic or a Transient?