AnsweredAssumed Answered

Friction and Time Step

Question asked by Jordan Truitt on Dec 21, 2017

I have a simulation I'm running as nonlinear static, it runs, and I get results. I'm just pulling two interference fit parts from each other, so I'm dealing with friction to get accurate results and so far Solidwork's can't do this. The time step is heavily influencing the results. Decreasing step size decreases my resulting pull off force BUT the actual contact force at the points of contact are consistent regardless of time step size. So the force used to calculate the friction force doesn't change yet the resultant force to pull the components apart does change...What is the relationship between step size and results? There should be some step size where results don't change right? Smaller and smaller time steps lower my results to not even believable results.


To get a comparison I had the exact same simulation ran in ANSYS and it gave results that look much more accurate and had consistent results across all time step sizes. Additionally the actual responses through the simulation aren't  even similar, everything about ANSYS' results look valid. Is Solidworks not good at solving nonlinear contact problems with friction?


Anything to do with time step effects or Solidwork's nonlinear friction would be really helpful, I'm at a loss. After having ANSYS solve it immediately with good looking results is making me think Solidwork's isn't capable of my problem.