Animated NVIDIA Flex soft body rig

I planned to create a destructible steel wall in unreal using flex. The goal was to be able to shoot the wall with a cannon and then see the wall deform, with several shots at the same point it should open a hole. I thought it would be easy to create the wall and convert it into cloth with tearing. The problem is that no mather what I do, the cloth never gets stiff like metal. And cloth is the only one with tearing. Anyone have any idea what I could do?