# Critical state (clay) plasticity model

 The clay plasticity model provided in Abaqus: describes the inelastic behavior of the material by a yield function that depends on the three stress invariants, an associated flow assumption to define the plastic strain rate, and a strain hardening theory that changes the size of the yield surface according to the inelastic volumetric strain; can have an isotropic or an anisotropic yield function; requires that the elastic part of the deformation be defined by using the isotropic or orthotropic linear elastic material model (Linear elastic behavior) or, in Abaqus/Standard, the porous elastic material model (Elastic behavior of porous materials) within the same material definition (porous elasticity is supported only for isotropic yield functions); allows for the hardening law to be defined by a piecewise linear form or, in Abaqus/Standard, by an exponential form; may optionally include hardening in hydrostatic tension; and can be used in conjunction with a regularization scheme for mitigating mesh dependence in situations where the material exhibits strain localization with increasing plastic deformation. The following topics are discussed:
 Related Topics About the material library Inelastic behavior In Other Guides *CLAY PLASTICITY *CLAY HARDENING *POTENTIAL *SOFTENING REGULARIZATION Defining clay plasticity Critical state models

ProductsAbaqus/StandardAbaqus/ExplicitAbaqus/CAE