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Interaction of dislocations and cracks in grains based on discrete dislocations

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Abstract

A interaction model between discrete dislocation emission and the grain boundary at the crack tip of microscale grain is described. When the dislocation emission condition is satisfied, dislocations will be emitted from the crack tip and will move along a slip plane to the grain boundary. Dislocations will pile at the grain boundary and create stress concentration. At this time dislocation penetration and crack nucleation at the grain boundary may occur. The distribution and penetration of dislocations at the crack tip will have a new effect on the crack. In this paper, different grain boundary angles and grain sizes are studied to find the relationship between dislocations and cracks. The results show that the main crack tends to propagate in large grain boundary angle and in small grain size crystalline materials. And wedge crack in the grain boundary tends to initiate with large grain boundary angle and in large grain size crystalline materials.

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Acknowledgements

The work is supported by the National Natural Science Foundation of China (11472230).

Funding

The work is supported by the National Natural Science Foundation of China (11472230).

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Authors and Affiliations

  1. School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, China

    Yue Sheng, Hongda Yang, Wentao Ma & Xiaoyu Jiang

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  1. Yue Sheng
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  2. Hongda Yang
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  3. Wentao Ma
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  4. Xiaoyu Jiang
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Correspondence to Xiaoyu Jiang.

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Sheng, Y., Yang, H., Ma, W. et al. Interaction of dislocations and cracks in grains based on discrete dislocations. Int J Fract 239, 135–147 (2023). https://doi.org/10.1007/s10704-022-00668-6

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  • DOI: https://doi.org/10.1007/s10704-022-00668-6

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