Element remoal

Hi

I am intending to make a concrete member model to investigate crack opening in tension zone. First, I wanted to use crack propagation model and could not get good result. So, I think that I can do it by using stress/strain principal failure and element removal.
I've tried to fiure out how I can apply this method in my model.
Is there enyone who has experience in this issue? Could you please help me in this matter?