Mesoscale Model for Predicting Hydrogen Damage in Face Centre Cubic Crystals

TL;DR

This paper develops a mesoscale crystal plasticity finite element model to predict hydrogen-induced damage in FCC crystals, analyzing effects of stress, orientation, and hydrogen concentration on deformation and void growth.

Contribution

It introduces a novel simulation framework that links crystal orientation and hydrogen trapping to damage evolution in FCC crystals.

Findings

Crystal orientation affects hydrogen's impact on deformation.

Hydrogen trapping varies with deformation stage and orientation.

An analytical relationship between void fraction and strain was derived.

Abstract

A study has been performed using a crystal plasticity based finite element method to understand the effect of various stress states and crystal orientations with respect to loading direction for FCC single crystals in both hydrogenated and non-hydrogenated environment. Simulations have been performed for a variety of stress triaxilaities, Lode parmeters, crystal orientations and hydrogen concentrations. It is observed that crystal orientation has a varied effect on the influence hydrogen has on plastic deformation and void growth. Hydrogen in trap distribution at various stages of the deformation process was also found to be influenced by crystal orientation. From analyses performed, an analytical relationship between normalised void fraction and equivalent strain has been derived.