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Rock Dynamic Crack Propagation Behaviour and Determination Method with Improved Single Cleavage Semi-circle Specimen Under Impact Loads

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Abstract

This paper studied the rock dynamic fracture propagation under impact loads elaborately with a determination method proposed to calculate crack propagation dynamic stress intensity factor (DSIF). By utilizing the split-Hopkinson pressure bar, the impact experiments with an improved single cleavage semi-circle (ISCSC) specimen were conducted to illuminate the dynamic crack propagation behaviour. Meanwhile, the fracture characteristics and crack propagation velocity were obtained by the crack propagation gauges. Coordinating experiments with a numerical approach, the crack propagation dynamic stress intensity factors were calculated by an experimental–numerical method with fractal theory. Then, a finite difference model was developed based on the tensile fracture softening damage criterion. With the analysis of numerical and experimental results, the crack propagation behaviour and mechanism of crack arrest were discussed sophisticatedly. The results demonstrate that the novel ISCSC specimen shows a definite advantage in determining crack propagation and arrest DSIF. Additionally, the crack arrest DSIF is larger than the average propagation DSIF with a sharp increase. Meanwhile, the numerical simulation results which agree well with the actual crack propagation illustrate that the crack arrest should be dominated by the compressive stress perpendicular to the crack path, and there were several arrest pauses existing in the transitory crack arrest process.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant Numbers 11702181, 11672194) and the Sichuan Science and Technology Program (Grant Numbers 2019YFG0047).

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Authors and Affiliations

  1. Failure Mechanics & Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province, Sichuan University, Chengdu, 610065, China

    Fei Wang, Hao Qiu & Peng Ying

  2. Key Laboratory of Deep Underground Science and Engineering (Sichuan University), Ministry of Education, Chengdu, 610065, China

    Meng Wang, Zheming Zhu & Jianhui Deng

  3. School of Engineering, The University of Warwick, Coventry, CV4 7AL, UK

    Meng Wang & Mohaddeseh Mousavi Nezhad

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  1. Fei Wang
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  2. Meng Wang
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  3. Zheming Zhu
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  4. Jianhui Deng
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Correspondence to Meng Wang.

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Wang, F., Wang, M., Zhu, Z. et al. Rock Dynamic Crack Propagation Behaviour and Determination Method with Improved Single Cleavage Semi-circle Specimen Under Impact Loads. Acta Mech. Solida Sin. 33, 793–811 (2020). https://doi.org/10.1007/s10338-020-00186-9

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