True, Engineering and Effective Stress Strain

True Stress - Strain Curve:
The engineering stress-strain curve is based entirely on the original dimensions of the specimen hence does not give a true indication of the deformation characteristics of a metal because. The dimensions change continuously during the test..

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Converting True Total Strain to Effective Plastic Strain:
Some material models require Effective Plastic strain as their input values. Go to the link below for more details. 

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