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Stress evolution of rock breakages by a disc cutter assisted by pre-cuts

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Abstract

To study the rock breakage mechanism by constant cross-section cutters assisted by pre-cuts, the present study first performed small-scaled linear cutting tests on sandstone specimens containing pre-cuts. The laboratory tests indicate that the sufficiently large penetration, causing successful internal and surface crack incisions, is essential for large chip formation. In addition, the small pre-cut depth may fail to form large chips. The numerical results agree well with laboratory tests in fracture patterns. More importantly, the numerical analysis indicates that the increases in rolling force frequently result in stress concentrations. When the stresses concentrate to critical values, fracture propagation occurs. The fracture propagation causes stress dissipation and the decrease in rolling force. Thus, the relation between cutting load fluctuations and crack propagation is revealed. Moreover, the influence of penetration on crack propagation is analyzed. By analyzing the stress fields at typical peak points of the rolling force, the crack propagation direction is predicted, and the influence of pre-cut depth on fracture propagation is studied.

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Data availability

All data included in this study are available upon reasonable request by contacting with the corresponding author.

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Acknowledgements

This study was funded by the National Natural Science Foundation of China and Projects (51804110) and Scientific Research Foundation of Hunan Province Education Department (21A0456, 21A0453).

Funding

This study was funded by the National Natural Science Foundation of China (51804110) and Scientific Research Foundation of Hunan Province Education Department (21A0456, 21A0453).

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Authors and Affiliations

  1. Department of Building Engineering, Hunan Institute of Engineering, 88th Fuxing Road, Xiangtan, China

    Jie Liu, Wei Chen & Di Peng

  2. School of Resources and Safety, Central South University, Changsha, China

    Taoying Liu

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  1. Jie Liu
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  2. Wei Chen
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  3. Taoying Liu
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Correspondence to Jie Liu.

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Liu, J., Chen, W., Liu, T. et al. Stress evolution of rock breakages by a disc cutter assisted by pre-cuts. Archiv.Civ.Mech.Eng 23, 115 (2023). https://doi.org/10.1007/s43452-023-00661-3

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  • DOI: https://doi.org/10.1007/s43452-023-00661-3

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