Micro-Modelling Approach to Predict the Influence of Hydrogen Pressure on Short Crack Behaviour

• 作者: Carl Blais Claude Lincourt Jacques Lanteigne Madhavarao Krishnadev
• 来源期刊: 材料科学建模与数值模拟(英文)
• 学科: 医学
• 关键词: Hydrogen TOUGHNESS Finite Element Analysis MODELLING Characteristic LENGTH FRACTURE Stress
• 年，卷（期）: 2013,（3）
• 页码范围: 37-40
• 页数: 4页
• 分类号: R73

摘要

A micromechanical model, based on the FEA (finite element analysis), was developed to estimate the influence of hydrogen pressure on short crack behaviour. Morphology of voids has important connotations in the development of the model. Stress intensity factor was calculated for different crack geometries under hydrogen pressure. The analysis indicates that the form factor of a crack emerging from a round void will be less affected by trapped hydrogen pressure-compared to an elongated void. This analysis reinforces the beneficial effect of inclusion shape control in reducing significantly the detrimental effect of hydrogen.