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Mechanism of Crack Propagation for K9 Glass

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Abstract

In order to study the mechanism of crack propagation, the varied cutting-depth scratch experiment is carried out and smoothed particle hydrodynamics (SPH) simulation method is used to assistant the investigation. The SPH simulation results reveal that crack will propagate in the direction where stress concentration exceeds the fracture toughness of K9 glass. The initial crack length in critical transition depth is calculated by combining the critical stress of fracture and the fracture toughness of K9 glass. Based on the effective plastic strain, the relation between scratching depth and crack depth is obtained. The recovery of crack tip is found and explained from the relationship between cutting depth and crack depth. Using the energy balance theory of Griffith, the variation of material internal energy is revealed. Comparing the scratching forces obtained from experiment and simulation, the validity of simulation results is verified. The phenomenon of crack delayed propagation is found in both experiment and simulation. The explanation of mechanism is given.

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Acknowledgements

The authors would like to acknowledge the financial support from the National Natural Science foundation of China (General Program, Nos. 51575083 and 51505063), Science Fund for Creative Research Groups (No. 51621064) and the EPSRC (EP/K018345/1) in the UK.

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Authors and Affiliations

  1. Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, 116024, China

    Xiaoguang Guo, Yutong Shi, Renke Kang & Zhuji Jin

  2. Centre for Precision Manufacturing, Department of Design, Manufacture and Engineering Management, University of Strathclyde, Glasgow, G1 1XJ, UK

    Xichun Luo & Fei Ding

  3. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, China

    Zhipeng Li

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  1. Xiaoguang Guo
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  4. Renke Kang
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  5. Zhuji Jin
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Correspondence to Yutong Shi or Xichun Luo.

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Guo, X., Shi, Y., Luo, X. et al. Mechanism of Crack Propagation for K9 Glass. Int. J. Precis. Eng. Manuf. 20, 815–825 (2019). https://doi.org/10.1007/s12541-019-00109-w

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  • DOI: https://doi.org/10.1007/s12541-019-00109-w

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