I need to compute the yield point for an experimental true stress vs true strain plot of a material as attached in the screenshot.(adsbygoogle = window.adsbygoogle || []).push({});

See attached;

I have true stress vs true strain plot. I took some initial points on the curve and fitted a straight line which gives me the elastic part of the curve.

I constructed a line parallel to this straight line (parallel line has same slope as straight line, I got the constant of y = mx + c of the parallel line by putting x =0.002 when y = 0).

But from the graph it is evident that yield point is around 1500 MPa but the offset method gives me a yield point around 1235 MPa.

Please can anyone suggets/help what is going wrong?

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# 0.2 percent offset for computing the yield point

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