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## Simulation of a "Small" Collision

Hello All,

I am doing some exercises in order to transition from using ANSYS to Simulate. In this exercise I am trying to preform a nonlinear simulation (i.e. large deflection and contacts) on the assembly seen in the figure below. You can see that there is a small gap between the pin and the mounting block. The nonlinear iteration is not converge (It does converge if there is no gap, but that is not reality). Assembly file is attached (Creo 4.0 M090). Any help and suggestions on the setup of the analysis would be welcomed.

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## Re: Simulation of a "Small" Collision

Hi @bafoster84,

Try adding a fixed constraint in X and Z translation at the load as shown.

You could also change the contact from frictionless to infinite or finite friction, but there is a big computation cost.

Your mesh size seems too large, you probably want to control it to a smaller size especially near the pin.

Also you should probably have at least 5 output steps to help convergence.

Theoretically there should be no result difference with and without the gap.  Creo is not a true dynamic solver and so does not include inertia or stress travelling waves.  Also, since there are sharp corners biting in at the contact to the pin (as it bends), the stress there will be highly mesh dependent.  This is a problem whether using Ansys or Creo and so correlation requires more careful study.

2 REPLIES 2
Highlighted

## Re: Simulation of a "Small" Collision

Hi @bafoster84,

Try adding a fixed constraint in X and Z translation at the load as shown.

You could also change the contact from frictionless to infinite or finite friction, but there is a big computation cost.

Your mesh size seems too large, you probably want to control it to a smaller size especially near the pin.

Also you should probably have at least 5 output steps to help convergence.

Theoretically there should be no result difference with and without the gap.  Creo is not a true dynamic solver and so does not include inertia or stress travelling waves.  Also, since there are sharp corners biting in at the contact to the pin (as it bends), the stress there will be highly mesh dependent.  This is a problem whether using Ansys or Creo and so correlation requires more careful study.

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## Re: Simulation of a "Small" Collision

Thank you sir!

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