Extended Drucker-Prager models

 The extended Drucker-Prager models: are used to model frictional materials, which are typically granular-like soils and rock, and exhibit pressure-dependent yield (the material becomes stronger as the pressure increases); are used to model materials in which the compressive yield strength is greater than the tensile yield strength, such as those commonly found in composite and polymeric materials; allow a material to harden and/or soften isotropically; generally allow for volume change with inelastic behavior: the flow rule, defining the inelastic straining, allows simultaneous inelastic dilation (volume increase) and inelastic shearing; can include creep in Abaqus/Standard if the material exhibits long-term inelastic deformations; can be defined to be sensitive to the rate of straining, as is often the case in polymeric materials; can be used in conjunction with either the elastic material model (Linear elastic behavior) or, in Abaqus/Standard if creep is not defined, the porous elastic material model (Elastic behavior of porous materials); can be used in conjunction with an equation of state model (Equation of state) to describe the hydrodynamic response of the material in Abaqus/Explicit; can be used in conjunction with the models of progressive damage and failure (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; and are intended to simulate material response under essentially monotonic loading. The following topics are discussed:
 Related Topics About the material library Inelastic behavior Rate-dependent yield Rate-dependent plasticity: creep and swelling Progressive Damage and Failure In Other Guides *DRUCKER PRAGER *DRUCKER PRAGER HARDENING *RATE DEPENDENT *DRUCKER PRAGER CREEP *TRIAXIAL TEST DATA Defining Drucker-Prager plasticity

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