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This question came up on my midterm and I had no idea how to answer it without redrawing the entire curve as a stress vs. strain curve (which obviously took too long to do).

Anyway, I'm just requesting a general procedure, not a numerical answer. If you had a Load (y-axis) vs. Displacement (x-axis) curve, how do you calculate the yield strength? I know for a stress vs. strain curve, you have to have a 0.2% (0.002) offset, but my Professor told me that the offset is not of the same value in a Load vs. Displacement curve (which makes sense).

However ... what <i>is</i> the actual offset supposed to be? Is there a formula to calculate it?

Any help would be very much appreciated! :)

Thank you,

Gina

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# Calculating Yield Strength using a Load vs. Displacement Curve

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