Hello. Other than that, I have a question about the johnson-cook damage model. As far as I know, the johnson-cook damage model in Abaqus software is a model that can define damage initiation strain. (attached image: εi=the plastic strain at damage initiation) By the way, why is the "fracture strain" value necessary to obtain the parameters D1, D2, D3.... required for this model? I mean, I thought it might be right to use the strain at the point where the damage initiate, not a fracture strain.
(I accidentally found a very good channel that summarizes the johnson-cook damage model, and in this channel, parameters are obtained through "fracture strain and triaxiality":https://www.youtube.com/watch?v=awpkDOtH6V4&t=1s) Thank you for your reply.
Dear Junyoung,
Assuming the strain where damage initiates will not be of concern of it is below the fracture strain and hence, definition of damage would be meaningless. Please refer to the following:
https://abaqus-docs.mit.edu/2017/English/SIMACAEMATRefMap/simamat-c-johnsoncook.htm
https://abaqus-docs.mit.edu/2017/English/SIMACAEMATRefMap/simamat-c-damageductile.htm
https://abaqus-docs.mit.edu/2017/English/SIMACAECAERefMap/simacae-t-prpmechanicaldamageductile.htm
the "damage" by Johnson-cook damage model reaches 1 means the damage initiation, the from the failure strain a new damage evolution occurs up to fracture strain.
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