How to input the attached true stress-strain curve in abaqus

[panugantipk]

I have got a true stress strain curve from a test. Refer to the attachment for the true stress-strain curve. I want to use this material data in elastic- plastic analysis. Assuming the material starts to yield after 0.006 strain value where the curve changes it slope, the plastic strain if i calculate after yield (ie. total strain - elastic strain, where elastic strain= stress/Young modulus) is coming negative. How i can get the plastic data for this curve.

 

[corus]

I think you've not zeroed the machine properly so your true data starts from 0.006 strain. There may be some initial movement that gives you strain for little stress. Try testing some material where the data is known to see how they compare.