This criterion is based on the determination
of the distortion energy in a given material, i.e., of the
energy associated with changes in the shape in that material
( as opposed to the energy associated with the changes in
volume in the same material ). According to this
criterion, named after German-American applied
mathematician Richard von Mises (1883-1953), a given
structural material is safe as long as the maximum value of
the distortion energy per unit volume in that material
remains smaller than the distortion energy per unit volume required to cause yield in a
tensile-test specified of the
same material.
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