Generally the simulation of impact forces between objects is performed using an explicit solver and to my knowledge Pro/Mechanica is not able to solve problems using an explicit solver methodology. One solution to your problem would be to make a few approximations and perform a static structural analysis on your part. Depending on the geometry of your part, journal articles may contain similar geometry along with pressure distributions and forces. If you are able to get a pressure distribution, a spatially varying pressure load can be applied to your model. A web search for “Wagner's theory� may also help for a pressure distribution. Another solution that may help is a web search for “explicit dynamics�.