Learning Forum

[mrom0007]

Hi I am havin some issues with a model I am trying to run. I have got it working with bonded contacts but for some reason I can't get it to work with frictional contact. 

 

I am working in transient structural, what I am trying to do it apply a force in steps to the cylinder object and make it colide with a gripper finger to see how it deforms and the forces apply along the finger. I need the force as it is important for my study. And the frictional is important as we are trying to simulate what it will be like in the real world. Everytime I try to run, no matter what I have tried to change the cyclinder just passses straight through the finger. I have the initial contact info set up, with the contact being near open. I have play around with the pinball radius and that didn't work either. 

 

I have tried both making the target surface the finger and the cylinder, but neither has worked. I am unsure what I am doing wrong, and would love some advice on where to go from here.

Thanks

 

[Gary Stofan]

Try applying the Force load very slowly by adjusting the time stepping / smaller time steps. 

Or, try applying a Displacement load instead of a Force. 
You can read the resulting Force value as a Reaction at the Displacement.

[mrom0007]

 

I swapped to a displacement load, and I am getting some errors now I am unsure about

*** ERROR ***                           CP =      86.234   TIME= 09:03:44
 Solution not converged at time 0.5 (load step 1 substep 1).            
  Run terminated.                                                       

 *** WARNING ***                         CP =      86.234   TIME= 09:03:44
 The unconverged solution (identified as time 1 substep 999999) is      
 output for analysis debug purposes.  Results should not be used for    
 any other purpose.                  

 

 

I am also getting this one:

 

 

The solver engine was unable to converge on a solution for the nonlinear problem as constrained.  Please see the Troubleshooting section of the Help System for more information.

 

I am a bit unsure about these errors