Numerical Analysis on Hydrogen Diffusionin Solid Around The Crack Tip.

Abstract

Construction of physical model and numerical analysis were carried out concerning hydrogen diffusion in solid under the elastic and elastic-plastic local stress field. These analyses showed that hydrogen diffuses and concentrates at the site of the elastic-plastic boundary in the direction of crack length, when the gradient of the initial density of hydrogen exists in this region. The characteristic of hydrogen concentration in this region is accelerated when yield stress becomes larger. These analytical results were related to the sensitivity of corrosion cracking.