Grain Boundary Slip and a Grain Boundary Triple Junction Crack Nucleation Model for Nanocrystals Under the Influence of Hydrogen

ZHAO Keke; ZHU Yundie; ZHANG Jiding; JIANG Xiaoyu

doi:10.21656/1000-0887.440257

Volume 45 Issue 7

Jul. 2024

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Article Navigation > Applied Mathematics and Mechanics > 2024 > 45(7): 875-885

ZHAO Keke, ZHU Yundie, ZHANG Jiding, JIANG Xiaoyu. Grain Boundary Slip and a Grain Boundary Triple Junction Crack Nucleation Model for Nanocrystals Under the Influence of Hydrogen[J]. Applied Mathematics and Mechanics, 2024, 45(7): 875-885. doi: 10.21656/1000-0887.440257

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Grain Boundary Slip and a Grain Boundary Triple Junction Crack Nucleation Model for Nanocrystals Under the Influence of Hydrogen

doi: 10.21656/1000-0887.440257

School of Mechanics and Aerospace Engineering, Southwest Jiaotong University，Chengdu 611756, P.R. China

Received Date: 2023-08-22
Rev Recd Date: 2024-02-01
Publish Date: 2024-07-01

Abstract

Abstract

Under the far-field uniform tensile load, the crack tip will generate stress concentration, and the grain boundary adjacent to the crack tip will bear large shear stresses to cause nanograin boundary slip. The effects of hydrogen and nanoboundary slip on the crack nucleation, the critical stress intensity factor and the shielding action were investigated. The theoretical solution of the model was given with the continuous distributed dislocation method. The results show that, the wedge cracks preferentially germinate along direction DC of the grain boundary triple junction and grain boundary BD due to the plugging of the dislocation at the grain boundary triple junction and the tip of the slip plane. Moreover, hydrogen decreases the total energy of crack initiation. When hydrogen concentration increases by 1%, the total energy of the most stable crack initiation will decrease by about 1.86%. Although the grain boundary slip increases the critical stress intensity factor and the shielding action at the crack tip, hydrogen will decrease the critical stress intensity factor. Finally, according to the hydrogen enhanced decohesion (HEDE) theory, the influence of hydrogen on surface energy was studied. With every 1% increase of the hydrogen concentration, the surface energy will decrease by 5%. This theoretical work provides new information on the microscopic fracture mechanics of materials caused by hydrogen and grain boundary slip, and helps to explain the microscopic mechanism of metal fracture.
- grain boundary slip,
- grain boundary triple junction,
- crack,
- hydrogen,
- critical stress intensity factor,
- shielding effect

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References(24)

References

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