This model is an improvement of the previous model. Instead of considering the stress constant equal to the yield stress in the plastic region, plastic stresses are calculated using a “hardening” curve.
It is called “multi-linear” because the hardening part (the nonlinear part of the curve) is calculated using a series of points provided by the user (you) and then approximated with a linear approximation on each segment between the points.
Read this article for more details about Nonlinear material models/
http://feaforall.com/nonlinear-material-model-fea/
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