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bafoster841-Visitor
1-Visitor
January 4, 2020
Solved

Simulation of a "Small" Collision

  • January 4, 2020
  • 1 reply
  • 2397 views

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.

Best answer by SweetPeasHub

Hi @bafoster84,

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

 

SweetPeasHub_0-1578321031297.png

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.

SweetPeasHub_1-1578321741147.png

 

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.

 

1 reply

S
SweetPeasHub17-PeridotAnswer
17-Peridot
January 6, 2020

Hi @bafoster84,

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

 

SweetPeasHub_0-1578321031297.png

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.

SweetPeasHub_1-1578321741147.png

 

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.

 

    B
    bafoster841-VisitorAuthor
    1-Visitor
    January 6, 2020

    Thank you sir!

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