A phase-field model for hydrogen-assisted fracture in elastic-plastic solids

F. DUDA; A. CIARBONETTI; S TORO; A E. HUESPE

Nantes

Conferencia; CFRAC 2017 International Conference on Computational Fracture and Failure of Materials and Structures; 2017

ECCOMAS

This paper deals with the formulation and numerical implementation of a coupledcontinuum theory for the interaction of elastoplastic deformation, hydrogen diffusion andfracture in solids. The theory is developed within the framework of continuum mechanicsand relies on recently developed strategies for incorporating an additional phase field toembody fracture ([1]).A specialization of the theory is presented to model hydrogen-enhanced decohesionin metals and the corresponding numerical implementation based on the finite-elementmethod for spatial discretization and an implicit Euler scheme for time-stepping.To illustrate its potential utility, we apply the model to investigate the problem ofenvironmentally-assisted crack propagation in a center-cracked panel under tensile loading. The results are compared with the ones obtained in [2]. It is shown that the model iscapable of reproducing some distinctive experimental facts of this problem published inthe literature.