I want to simulate the buckling of a thin film that is sticked on a pre-stretched rubber substrate. The buckling comes as a result of the compression after releasing the stretch of the rubber.

I tried with "tie constraint" for the binding between the film and the substrate.

In the first step (general static), I deactivate the film and the model runs with only stretching the substrate.

In the second step (general static), reactivate the film and keep the stretch on the substrate (stretch propagated).

In the 3rd step (linear buckling), I release the stretch on the substrate.

Unfortunately, the tie constraint seems to still work in the first step even the fact that I deactivate it. Note that the film disappears in the first step. I know that because in the 2nd step the deformation of the film is observed even there is no new loading in this step (only activation of the film). That means some effects of the tie constraint should still work in the first step.

Any comments on this issue would be thankful. Or maybe is there a better way to simulate such a problem?

Thank you.