Primal interface debonding formulation for finite strain isotropic plasticity

Aduloju, Sunday; Truster, Timothy J.

doi:10.1016/j.mechrescom.2020.103606

Primal interface debonding formulation for finite strain isotropic plasticity

Journal Article · Fri Oct 16 00:00:00 EDT 2020 · Mechanics Research Communications

DOI:https://doi.org/10.1016/j.mechrescom.2020.103606· OSTI ID:1813173

^[1]; Truster, Timothy J. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)

In this work, a framework is developed for modeling ductile damage of nonlinear materials whose plastic deformation is characterized using rate independent classical plasticity. This method relies on the assumption that the free energy can be decomposed into elastic, plastic and damage parts. A thermodynamically consistent method is derived which satisfies the second law of thermodynamics in the Clausius–Duhem inequality form. The dissipation associated with plasticity takes place in the domain only, while damage dissipation is localized to the interface. The method is developed using Variational Multiscale ideas to obtain definitions of the interface fluxes within a primal formulation analogous to the Discontinuous Galerkin method, which ensures weakly vanishing interface gap prior to reaching a damage initiation criterion. The local nonlinear problem to calculate both plastic deformation gradient and damage variable follows an incremental approach similar to classical plasticity return mapping algorithm. This elastoplastic damage formulation is developed for material undergoing finite strain, and it naturally accommodates a trapezoidal traction separation law (TSL) whose shape can be varied to model either ductile interface behavior or brittle interface behavior. The formulation's performance is assessed through modeling a patch test and a compact tension specimen.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1813173

Journal Information:: Mechanics Research Communications, Journal Name: Mechanics Research Communications Journal Issue: 1 Vol. 112; ISSN 0093-6413

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Computational inelasticity
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Primal interface debonding formulation for finite strain isotropic plasticity

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