Lets say you apply a force, yield the structure and then remove the load. After unloading the structure would be in a stress free state but with a permanent plastic strain right? Thus it would be incorrect to say that if the material exceeds the yield strain, it should exceed the yield stress too. Could you take a node and plot a curve of equivalent stress vs total strain for the entire loading history? Something like
. Then compare the plot with your input material stress-strain data.
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