# Classical metal plasticity

 The classical metal plasticity models: use Mises or Hill yield surfaces with associated plastic flow, which allow for isotropic and anisotropic yield, respectively; use perfect plasticity or isotropic hardening behavior; can be used when rate-dependent effects are important; are intended for applications such as crash analyses, metal forming, and general collapse studies (Plasticity models that include kinematic hardening and are, therefore, more suitable for cases involving cyclic loading are also available in Abaqus: see Models for metals subjected to cyclic loading.); can be used in any procedure that uses elements with displacement degrees of freedom; can be used in a fully coupled temperature-displacement analysis (Fully coupled thermal-stress analysis), a fully coupled thermal-electrical-structural analysis (Fully coupled thermal-electrical-structural analysis), or an adiabatic thermal-stress analysis (Adiabatic analysis) such that plastic dissipation results in the heating of a material; can be used in conjunction with the models of progressive damage and failure in Abaqus (About damage and failure for ductile metals) to specify different damage initiation criteria and damage evolution laws that allow for the progressive degradation of the material stiffness and the removal of elements from the mesh; can be used in conjunction with the shear failure model in Abaqus/Explicit to provide a simple ductile dynamic failure criterion that allows for the removal of elements from the mesh, although the progressive damage and failure methods discussed above are generally recommended instead; can be used in conjunction with the tensile failure model in Abaqus/Explicit to provide a tensile spall criterion offering a number of failure choices and removal of elements from the mesh; and must be used in conjunction with either the linear elastic material model (Linear elastic behavior) or the equation of state material model (Equation of state). The following topics are discussed:
 Related Topics Rate-dependent yield Anisotropic yield/creep Johnson-Cook plasticity Progressive Damage and Failure Dynamic failure models About the material library Inelastic behavior In Other Guides UHARD *PLASTIC *RATE DEPENDENT *POTENTIAL Defining classical metal plasticity

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