The Von Mises yield criterion depends only on the second invariant of deviatoric stress. With shear yield stress , its surface is ; the uniaxial yield stress is . An associated flow rule gives plastic strain rate proportional to , up to a positive normalization of the plastic multiplier.
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The von Mises yield criterion, also known as the von Mises plasticity criterion, is a theoretical model used in materials science and engineering to predict the yielding of ductile materials under complex loading conditions. It is particularly valuable in the field of continuum mechanics and structural engineering.