Computational modeling study demonstrates history-dependent fracture resistance capture in ductile materials, indicating improved predictive capability for dynamic crack propagation.
Key Points
To develop a dynamic phase-field framework that accurately captures the degrading effect of accumulated plastic deformation on fracture resistance in ductile materials.
Formulated a phase-field model in a small-strain elasto-plastic framework using classical von Mises plasticity with isotropic hardening and dynamic inertia terms.
Degraded the critical energy release rate as a function of accumulated plastic strain to phenomenologically represent microstructural weakening without directly driving cracks with plastic dissipation.
Implemented the formulation in a commercial finite element environment and evaluated it using quasi-static and dynamic numerical benchmark simulations.
Captured key experimental and physical trends in ductile crack initiation and crack propagation path evolution under static and dynamic loading conditions.
Successfully represented plasticity-induced material weakening and its evolving influence on fracture resistance across varying loading rates.