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No physical contact resolution

Error

Problem in physical contact resolution. The solver was unable to resolve the contact under specified fixed point iterations. Either change your master or slave assignment or decrease the value of penalty coefficient under contact.

What happened?

The solution diverged due to no convergence under specific fixed point iterations for the penalty contact.

What could be the possible reason?

This error may occur when a nonlinear penalty (physical) contact between two solids couldn’t be converged under prescribed fixed point iterations. The convergence problem can happen either due to wrong assignment of the master and slave surface or the Penalty coefficient (stiffness of elements in contact) is too high to be converged under fixed point iterations.

What can I do now?

In order to get rid of this error, you can:

  • try to see if the master and slave assignments are correct. For example, if the surface in contact of one of the solid is more curved or sharp than the other solid contact surface, than assign curved or sharp surface as slave surface for the contact. Since the slave nodes are normally projected on to the master face, by doing this the contact problem can be solved easily.

  • try to decrease the value of Penalty coefficient (stiffness of elements in contact) which may lead to more penetration but initially will solve the convergence issue. Than later on you can increase the coefficient value until the your contact condition is satisfied.

Note

If none of the above suggestions did solve your problem, then please post the issue on our forum or contact us.