Discussion Forum

It may be so that you have selected the source side of the contact pair. The contact pressure is defined on the destination side.

Yes, Thanks I find it but if I want to plot the contact pressure on the source boundary at the interface then what will be the method? it is the case of plastic deformation at the contact interface.

You can use the variable for the stress in the normal direction. It is computed from the stress tensor in the element, not from the contact variables. It is available on all boundaries. The variable name is solid.stn (or in your case: solid2.stn).

As an alternative, you can map the contact pressure from the destination side to the source side, using an expression like dst2src_p1(solid2.Tn). Here, "_p1" refers to the pair name.

Thanks for your suggestions, I tried but expression dst2src_p1(solid2.Tn) giving 0 value in the graph on source boundary but I get correct value for solid2.Tn on destination boundary. solid.stn giving the value of normal stress which is different from the contact pressure plot. Thanks

The solid.stn value (or, to be more exact, -solid.stn) will not be identical to the contact pressure since they are based on different types of evaluations. They will however converge to each other if the mesh is refined. A large difference would indicate an underresolved model.

There is one subtle difference: If the strains are large, you will see the effect that the contact pressure is measured per undeformed area, while solid.stn is measured per deformed area.

Note that the stress solid.stn is formed from the stress tensor used in any nonlinear constitutive model (since you mentioned plasticity).

Why you got a zero value when using the mapping operator is difficult to guess.

Thanks, after some modification I get the right answers using dst2src_p1(solid2.Tn) for the contact stress at the source boundary also. Thanks for your suggestions.