TITLE:
Micro-Modelling Approach to Predict the Influence of Hydrogen Pressure on Short Crack Behaviour
AUTHORS:
Claude Lincourt, Jacques Lanteigne, Madhavarao Krishnadev, Carl Blais
KEYWORDS:
Hydrogen; Toughness; Finite Element Analysis; Modelling; Characteristic Length; Fracture Stress
JOURNAL NAME:
Modeling and Numerical Simulation of Material Science,
Vol.3 No.3A,
August
8,
2013
ABSTRACT: 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.