Abstract
Understanding of years-old multifaceted hydrogen-assisted damage evolution necessitates efforts to model the coupled diffusion-mechanics response of metallic materials to make them immune to the hydrogen environment. Informed by the various mechanisms understood earlier via experiments and/or multi-scale modelling techniques, this work presents a coupled deformation-diffusion-damage framework to simulate hydrogen-assisted damage in metals.
The proposed finite element computational framework consists of a dislocation density- based crystal plasticity model coupled with a slip-rate based hydrogen transport model to simulate the two-way effect i.e. the role of local microstructural deformation on hydrogen distribution and vice-versa. This two-way model is further extended to simulate the damage behavior under a hydrogen environment by phase-field for fracture. This modelling framework is implemented in Abaqus software by using User Subroutine.
The proposed framework is validated on simple single-crystal data, and apply to polycrystalline configurations.