Nonlinear Structural Materials Module
New Functionality in Version 6.4
Phase-Field Damage
A new multiphysics interface has been added, Phase-Field Damage, Explicit Dynamics. In terms of functionality, the new interface is equivalent to the Phase-Field Damage multiphysics interface, but the new interface couples the (also new) Solid Mechanics, Explicit Dynamics interface to the Phase Field in Solids interface. This new functionality is showcased in the model Phase-Field Modeling of Dynamic Crack Branching.
The Phase-Field Damage node has been extended with new options for modeling of quasibrittle fractures.
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The Rankine criterion has been added as a crack driving force.
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A new rational damage evolution function has been added.
The linear, exponential, and Cornelissen softening laws, common for modeling concrete, are available as rational degradation functions for the phase-field regularized cohesive zone model (PFCZM).
Improved Time Discretization
The Euler steps used in the discretized equations to compute creep, viscoplasticity, polymer viscoplasticity, and adiabatic heating have been revamped.
These improvements enable faster evaluation of variables and resolve issues with the initialization of state variables when continuing the solution in subsequent study steps.
Porous Plasticity
The Porous Plasticity node has been improved: The user interface has been revamped and the implementation is now more robust. All isotropic hardening models available in the Plasticity node are now also available for the Shima–Oyane, Gurson, Gurson–Tvergaard–Needleman, Fleck–Kuhn–McMeeking, and FKM–GTN material models.
The power law isotropic hardening option has been removed; the same functionality is available with the Swift isotropic hardening model.
A linear hardening option and Cam-clay cap model have been added to the Capped Drucker–Prager model.
Intercalation Strain
A reference concentration has been added to the Intercalation Strain subnode of the Hyperelastic Material node. This addition makes it possible to define a strain-free configuration with a nonzero concentration.
Hill Orthotropic Plasticity
The user interface for the Hill orthotropic plasticity model has been revamped. The initial yield stress can either be computed from Hill’s coefficients or defined as a user input parameter.
Hyperelastic Materials
A new polynomial model has been added to the available models for the volumetric strain energy density.
Viscoplasticity and Creep
A new subnode, Set Variables, has been added to the Viscoplasticity and Creep nodes. The purpose of this node is to reset inelastic states to model cases like stress relieving and annealing.