Hi everyone,

so I've been trying to simulate a punching process, but the material refuses to split at all and just deforms until the simulation breaks down from too many attempts.

I thought the solution would be Johnson-Cook damage, but I keep getting errors as seen below (first error comes everytime, second error, when I try J.C. and third error, when I activate "deformation at failure" and/or "strain at failure"

I am pretty sure, that I am getting something wrong regarding the material, but I have no idea what it could be. I think I have tried every combination of ductile damage, shearing damage or J-C-damage but no luck so far (see 2ndpicture, sorry for the German language^^)

Anybody got an idea? Thanks in advance!