Simulation Fails depending on Material

[Anonymous]

I am running a simulation of a rubberish (elastomer) cap being placed on a plastic.  The issue is the model fails to complete about 40% through.  When I switch the bottle material to a rigid material (say steel), the simulation completes.  I have tried refining the mesh but the model still stalls around 40%.  The model info is below.  I am guessing that there is a node somewhere that is reaching an infinite displacement that the system can't fix.  Is this a know issue for the MES function when running two bodies that both deform?

Model:

- MES with nonlinear material

- Bottle:

  -  Isotropic element

- Cap:

  -  Hyperelatic (Mooney-Rivlin)

- 4mm forced displacement

- Global surface contact

Anything would help.

Robert.

[Andrew.Sartorelli]

Hi Robert,

One thing I would try is increasing the number of time-steps in the model. Especially, if you are using the default time-step of 20 with a hyperelastic material in MES. While the solver will automatically decrease the size of time-steps based on convergence criteria, it is often better to manually add in those time-steps.
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[zhuangs]

Hi Robert,

You can try the two changes: (1) check 'adaptive contact stiffness option" for the contact pair, or (2) select 'user-defined" contact stiffness and input a value of 100.

Thanks,

Shoubing