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Bolted Joint Progressive Failure Analysis

Bolted Joint Progressive Failure Analysis

Bolted Joint Progressive Failure Analysis

(OP)
Hello, I have a problem with progressive failure analysis. So I have 2 plates connected with bolt. The boundary conditions are, respectfully, at the bottom side plate fixed on the left side and at the upper side plate pulled out with MPC force. I'm using exactly the same properties (and mostly the same assumption) as the tutorial on this video.

https://www.youtube.com/watch?v=XHJvlwVmMJs

I applied 0.2 N force but the displacement vs constraint force graph still showing the linear line. My goal is to have the total damage for the plates. So in this case I have to apply material properties degradation, right? But I don't know how to do it. Could you give me some explanations about how to apply material degradation? And why if I apply 5 N or more of force the .sts file is showing index 1 (job terminates abnormally)? I really appreciate your help. Thank you very much.

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