Two-layer viscoplasticity

The two-layer viscoplastic model:

  • is intended for modeling materials in which significant time-dependent behavior as well as plasticity is observed, which for metals typically occurs at elevated temperatures;

  • consists of an elastic-plastic network that is in parallel with an elastic-viscous network (in contrast to the coupled creep and plasticity capabilities in which the plastic and the viscous networks are in series);

  • is based on a Mises or Hill yield condition in the elastic-plastic network and any of the available creep models in Abaqus/Standard (except the hyperbolic creep law) in the elastic-viscous network;

  • assumes a deviatoric inelastic response (hence, the pressure-dependent plasticity or creep models cannot be used to define the behavior of the two networks);

  • is intended for modeling material response under fluctuating loads over a wide range of temperatures; and

  • has been shown to provide good results for thermomechanical loading.

The following topics are discussed:

Related Topics
About the material library
Combining material behaviors
Inelastic behavior
In Other Guides
Defining the viscous component of a two-layer viscoplasticity model