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Hi STKO team -

I've modeled a concrete cylinder (UHPC) with rubber pads on the top and bottom faces. The material stress in the output is not as expected (compared to experimental results). I'm thinking this could be due to the interaction set between the pad and concrete? Could you let me know what you think the error may be? Thank you!

What do you mean by different?
Your material model seems strange. What concrete type are you trying to model?