Dear nThank you very much. I depended on body interactions in explicit, but I realized I set it only on one body by mistake. I am using explicit because I had a hard time with the convergence for hyperelastic materials in implicit solvers at high compression, so I try to adjust some settings to run a quasi-static simulation in explicit. one thing I want to ask again if possible do you have any idea why the Ogden foam model 3rd order is not working in explicit.nn I don't think the problem is with the constants I found because this message didn't appear in static structural when I tried the model in it. How can I define the equation of state in case that was the problem? n