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.
Highlights
Stress intensity factor at the onset of crack initiation depends on the local stress distribution in the vicinity of a microstructural stress raiser
The analysis indicates that the form factor of a crack emerging from a round void will be less affected by trapped hydrogen pressurecompared to an elongated void
This analysis reinforces the beneficial effect of inclusion shape control in reducing significantly the detrimental effect of hydrogen
Summary
Stress intensity factor at the onset of crack initiation depends on the local stress distribution in the vicinity of a microstructural stress raiser. We will use a similar FEA model to analyse the stress intensity factor of a microcrack when local hydrogen pressure in voids is superposed on the remote stress. 2. Mechanical Effect of Hydrogen in Voids/Inclusions on Fracture Toughness of Steel. The work of Pyun and Kim [8] indicates that the defects like micro voids and water quenched dislocations located at the interface between manganese sulphide inclusions and steel act as deep trap sites for hydrogen. The particularity of this study is to simulate at the same time hydrogen pressure inside a void and inside the lips of a microcrack emerging from this void. The stress generated by the local hydrogen pressure is added to the remote stress This way, each surrounding element is subjected to a simulated local hydrogen pressure acting on the stress intensity factor and on the emerging microcrack
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