Simply export true stress and plastic strain from your simulation results and run the code. this code converts them to true stress - true strain and nominal/engineering stress - strain which now is comparable with input.
This code will help to double check the material property.
Ashkan (2021). Convert true stress - plastic strain to nominal stress - strain (https://www.mathworks.com/matlabcentral/fileexchange/42791-convert-true-stress-plastic-strain-to-nominal-stress-strain), MATLAB Central File Exchange. Retrieved .
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