I am calculating the stress-strain curve for a material and I want to find when the curve is no longer linear - aka when it enters the plastic region. I have the function for the curve and I would like to know how to find that point when the slope is no longer constant. I can take the first and second derivative and visually see the slope and change in slope but I do not know how to find the value where it changes.
Does anyone have any recommendations?
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