MULTISCALE COUPLED MICROSTRUCTURE AND CONTINUUM CRITICAL DISLOCATION SITE METHOD FOR COUPLED CHEMO- MECHANICAL HYDROGEN EMBRITTLMENT PROBLEM

摘要

Under appreciation of aspects of the role of hydrogen plays in chemo-mechanics, such as hydrogen embrittlement of polycrystalline metals, has led the authors to propose a coupled microstructural and continuum critical dislocation site (CMCD) method. Determining the precise relationship between mechanical stresses and the diffusion of hydrogen in the microstructure plays an important role in better understanding the chemo-mechanical problem for predicting the hydrogen embrittlement mechanism. The proposed work is aimed at developing such a model which replaces the macro domain at critical dislocation sites with a microstructural domain. This critical micro-scale region is coupled with the macro-scale domain. This space coupled model initially solves the mechanical problem which is coupled sequentially with the chemical problem by employing stress assisted hydrogen diffusion. The motivation of this testing investigation is to evaluate the CMCD model to bridge the gap between microstructural and continuum space scale for the chemo-mechanical problem.