Effect of Hydrogen Embrittlement on Dislocation Emission from A Bifurcation Crack Tip in Nano-metallic Materials

Xiaoya Song; Min Yu

doi:10.54097/sv0vap85

Authors

Xiaoya Song
Min Yu

DOI:

https://doi.org/10.54097/sv0vap85

Keywords:

Hydrogen clusters; complex variable method; dislocation emission; stress intensity factor; bifurcation cracks.

Abstract

A theoretical model was established to investigate the interaction between hydrogen clusters and edge dislocation near bifurcation crack tip in deformed nano-metallic materials. The model’s solution was obtained by using the complex method, and the influence of hydrogen concentration, temperature, Relative crack length, material constants of nano-metallic materials and the dislocation emission angle on the critical stress intensity factor (SIFs) corresponding to the first dislocation emission from the crack tip was investigated through numerical analysis. The results show that dislocations are easy to emit from the crack tip at high hydrogen concentrations. However, under the influence of hydrogen clusters, the high temperature will make dislocation emission more difficult. At the same time, when relative cracks become longer, it becomes more difficult for dislocations to emit from the crack tip. As the angle of dislocation increased, the SIF first decreased and then increased. And as the angle between the main crack and the bifurcation crack continues to increase, the dislocation emission behavior at the tip of the bifurcation crack will be significantly promoted.

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