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Theory Manual Version 3.6
 Subsubsection 5.6.5.6: Maximum Shear Stress Up Subsection 5.6.5: Constitutive Models for Damage and Yield Criteria Subsubsection 5.6.5.8: Maximum Normal Lagrange Strain 

5.6.5.7 Drucker Shear Stress

This criterion is based on the yield criterion for plasticity introduced in [38]. Its damage (or yield) measure takes the form where , , is the yield limit in simple shear and is a user-specified non-dimensional material constant which must lie in the range . To better understand the meaning of , consider uniaxial loading of a bar which yields at the normal stress value of . In this case, In the special case when the Drucker criterion reduces to the von Mises criterion, with . To evaluate the damage or yield surface normal, we may use Eqs.(5.6.5.4-4)-(5.6.5.4-5) where
 Subsubsection 5.6.5.6: Maximum Shear Stress Up Subsection 5.6.5: Constitutive Models for Damage and Yield Criteria Subsubsection 5.6.5.8: Maximum Normal Lagrange Strain