5.2 Orthotropic Plasticity

This section describes the input syntax of orthotropic plasticity. The Hill [§5.2.1] and Hoffmann [§5.2.2] models are not available for beam elements and cannot be combined with hardening. The plane stress anisotropic Rankine-Hill model [§5.2.3] provides for softening in the tensile (Rankine) regime and hardening, with subsequent softening in the compressive (Hill) regime. Furthermore, the Rankine-Hill model can be combined with the Maxwell Chain viscoelasticity model [§7.2].