Contacts between nonlinear materials

[lucmartzz]

Hi,

I'm simulation the compression of a rubber part (defined as Mooney-Rivlin) and the parts that are in contact as linear material (standard aluminum 6061) and the simulation is successful, now I want to just change the material of the alum parts to a plastic with nonlinear properties (SS curve) but the simulation became extremely slow and doesn't seems to be close to be ok. The first setup take 6 hours to complete and the second just reach 0.05 of the load in 12 hours. 

Is there a consideration or detail that I'm missing?

Best.

[John_Holtz · Accepted solution]

Hi @lucmartzz 

I assume that the plastic part is not yielding at the beginning of the analysis, but that could be a possibility.

I think it is more likely that the contact stiffness is changing since it is relative to the material. If the parts are not sliding relative to each other, try the analysis with the parameter ("Parameters > Edit" near the end of the model tree) SLINESLIDETYPE set to STATIC. (If the part are moving a lot, such you are modeling an o-ring being pressed into a groove, then leaving SLINESLIDETYPE as DYNAMIC is good. But try a lower contact stiffness in this case.)