External crack propagation of concrete surface under explosive loading

CUI Xinnan; WANG Xuguang; WANG Yinjun; CHEN Zhiyuan

doi:10.11883/bzycj-2019-0364

Volume 40 Issue 5

May 2020

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SHEN Fei, WANG Hui, QU Kepeng, ZHANG Gao. Expansion and fracture characteristics of oxygen-free copper tubes with different grain sizes under detonation loading[J]. Explosion And Shock Waves, 2020, 40(2): 022201. doi: 10.11883/bzycj-2019-0063

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CUI Xinnan, WANG Xuguang, WANG Yinjun, CHEN Zhiyuan. External crack propagation of concrete surface under explosive loading[J]. Explosion And Shock Waves, 2020, 40(5): 052203. doi: 10.11883/bzycj-2019-0364

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External crack propagation of concrete surface under explosive loading

doi: 10.11883/bzycj-2019-0364

1.
School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2.
BGRIMM Technology Group, Beijing 100160, China

Received Date: 2019-09-19
Rev Recd Date: 2020-02-28

Available Online: 2020-04-25

Publish Date: 2020-05-01

Abstract

Abstract

To further investigate the failure mechanism of geotechnical materials under implosion loading, a novel blasting crack detection algorithm is proposed in this paper, the digital image correlation method is used to measure the surface displacement field and strain field, the crack propagation and expansion model is built. A concrete blasting experiment was carried out, the crack propagation and expansion process were measured and analyzed. The results show that the propagation of crack is a combined action of stress wave and explosive products. The maximum velocity is 225.95 m/s, the average velocity is 122.27 m/s, the total length is 159.92 mm, and the length propagation ceases at 1.75 ms. The opening of the crack is dominated by explosive products with a maximum width of 1.59 mm. The action time of explosive products is 4.5 ms. The tensile strain concentration zone appears before the initiation of crack and its shape determines the tendency of the crack. The fracture process zone is about 8−9 times of the maximum aggregate size.
- explosive loading,
- external crack,
- concrete,
- high-speed DIC,
- digital image processing,
- fracture process zone

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References

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