Hello Benjamin,It is not my project. I downloaded it from another place in this forum to be able to use ekill command in my project. I've already done it correctly, but it is just my curiousity if there is an error in software or if something else is wrong in the model. This is just to know the program better and omit its bugs. Anyway, thank You for Your effort. At least now we know that we have to define materials from scratch while duplicating Workbench systems. And Your in-depth analysis is very precious to me.nResponding to Your question:using ekill command without nonlinear behaviour of steel in my opinion makes no sense, therefore in my project i left eppl and defined bilinear hardening, just as it is in the faulty example nThanks again and cheers from Poland!nDamiann