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Dynamic response of medium with compound defect under blast loading

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Abstract

In this paper, the dynamic fracture characteristics and mechanism of the medium with compound defect under blast loading are studied by varying the relative positions of the void and pre-crack in the compound defect. A transmission caustics experimental system was used, while polymethyl methacrylate (PMMA) was selected as the experimental material. The void and crack were integrated into the same defect form, defined as a compound defect. The experimental results indicate that the end of the pre-crack is the weakest point of the defect, while the cracks are more likely to appear in the stress concentration area. By combining the interaction mechanism between the explosion stress wave and the end of the pre-crack, two modes of action for the medium containing compound defect under the blast loading were identified. One is that the stress wave directly acts at the end of the pre-crack, and the other is that the stress wave acts at the end of the pre-crack after circling around the void. As the relative positions of the void and the pre-crack change, the two forms of initiation and non-initiation were observed at the end of the pre-crack. The difficulty of initiating cracks at the end of prefabricated cracks is constantly changing which is indicated by the differences in crack tip initiation time and the stress intensity factor (the peak stress intensity factor when the crack had not initiated). At the same time, combined with the LS-DYNA finite element numerical simulation, the JH-2 material damage model is used to reproduce the dynamic damage evolution process of the composite defect, and the experimental results of the model are highly restored. The pressure values of the end element of the pre-crack under different defect structures are extracted from the numerical simulation results, and the possible reasons for the defect initiation in the composite are explained from the numerical simulation perspective. In future research, the JH-2 damage model can be widely used to solve issues pertaining to brittle materials such as PMMA. In practical blasting design processes, the relative position of the blasthole and compound defect should be considered as the basis of blasting parameter design.

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Data availability

The data used to support the findings of this study are available from the corresponding author upon request.

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Funding

This research is supported by the National Natural Science Foundation of China (grant no. 51934001), China Postdoctoral Science Foundation (grant no. 2020M680354), the Fundamental Research Funds for the Central Universities (grant no. FRF-TP-20-044A1), National Natural Science Foundation of China (grant no. 52074301), China Postdoctoral Science Foundation (2021M700386), and the Project Funded by China Postdoctoral Science Foundation (no. 2020TQ0032).

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Authors and Affiliations

  1. School of Civil and Resource Engineering, University of Science and Technology Bei**g, 30 Xueyuan Road, Haidian District, Bei**g, 100083, China

    Yong Zhao, ****g Zuo, Yu Wang, Zhen Liu & Songlin He

  2. Bei**g Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Bei**g, 30 Xueyuan Road, Haidian District, Bei**g, 100083, China

    Yong Zhao, ****g Zuo, Yu Wang, Zhen Liu & Songlin He

  3. School of Mechanics and Civil Engineering, China University of Mining and Technology (Bei**g), Ding No.11 Xueyuan Road, Haidian District, Bei**g, 100083, China

    **nmin Ma

Authors
  1. Yong Zhao
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  2. **nmin Ma
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  3. ****g Zuo
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  4. Yu Wang
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Correspondence to Yong Zhao.

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Responsible Editor: Murat Karakus

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Zhao, Y., Ma, X., Zuo, J. et al. Dynamic response of medium with compound defect under blast loading. Arab J Geosci 15, 902 (2022). https://doi.org/10.1007/s12517-022-10196-1

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  • DOI: https://doi.org/10.1007/s12517-022-10196-1

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