Implementation of a Plasticity Model with Orthotropic Yield Function and Damage in Finite Element Code

  • Vaňková, Tereza (Institute of Thermomechanics of the CAS)
  • Parma, Slavomír (Institute of Thermomechanics of the CAS)
  • Marek, René (Institute of Thermomechanics of the CAS)
  • Liu, Li-Wei (Department of Civil Engineering, NTU)
  • Gabriel, Dušan (Institute of Thermomechanics of the CAS)

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A plasticity model with the orthotropic yield function and damage is proposed and implemented in the finite element (FE) code. The model is suitable for materials whose elasto-plastic behavior is orthotropic and exhibits multiaxial ratcheting. Simultaneously, microscopic defects, such as microcracks and voids, can initiate and propagate in the material under load. This degradation of material is included to model through the phenomenological damage model, which describes the damaging process from a macroscopic point of view. The material model is formulated within the thermodynamic framework and assumes infinitesimal strains and additive decomposition of total strain. The model is implemented in the FE software Abaqus using the UMAT subroutine for the implicit solver Abaqus/Standard.