Stress-driven solution to rate-independent elasto-plasticity with damage at small strains and its computer implementation
It provides a stress-driven solution approach for coupled damage-plasticity problems, which is relevant for engineers modeling material failure, but the contribution appears incremental as it builds on existing gradient theories and fractional-step methods.
The paper develops a numerically efficient fractional-step time discretization scheme for quasistatic rate-independent damage combined with linearized plasticity with hardening, and demonstrates its convergence and stability through 2D finite-element simulations.
The quasistatic rate-independent damage combined with linearized plasticity with hardening at small strains is investigated. The fractional-step time discretisation is devised with the purpose to obtain a numerically efficient scheme converging possibly to a physically relevant stress-driven solutions, which however is to be verified a-posteriori by using a suitable integrated variant of the maximum-dissipation principle. Gradient theories both for damage and for plasticity are considered to make the scheme numerically stable with guaranteed convergence within the class of weak solutions. After finite-element approximation, this scheme is computationally implemented and illustrative 2-dimensional simulations are performed.