Numerical study on attenuation of stress wave in concrete subjected to explosion

GAO Chu; KONG Xiangzhen; FANG Qin; WANG Yin; YANG Ya

doi:10.11883/bzycj-2022-0041

Volume 42 Issue 12

Dec. 2022

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GAO Chu, KONG Xiangzhen, FANG Qin, WANG Yin, YANG Ya. Numerical study on attenuation of stress wave in concrete subjected to explosion[J]. Explosion And Shock Waves, 2022, 42(12): 123202. doi: 10.11883/bzycj-2022-0041

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GAO Chu, KONG Xiangzhen, FANG Qin, WANG Yin, YANG Ya. Numerical study on attenuation of stress wave in concrete subjected to explosion[J]. Explosion And Shock Waves, 2022, 42(12): 123202. doi: 10.11883/bzycj-2022-0041

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Numerical study on attenuation of stress wave in concrete subjected to explosion

doi: 10.11883/bzycj-2022-0041

GAO Chu^{1, 2
,},
KONG Xiangzhen^{1
,
,},
FANG Qin¹,
WANG Yin¹,
YANG Ya¹

1.
State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China
2.
Inner Mongolia University of Finance and Economics, Hohhot 010070, Inner Mongolia, China

Received Date: 2022-01-25
Rev Recd Date: 2022-03-09

Available Online: 2022-03-29

Publish Date: 2022-12-08

Abstract

Abstract

Based on the Kong-Fang concrete material model and the multi-material arbitrary Lagrangian Eulerian (MMALE) algorithm available in LS-DYNA, the attenuation of stress wave in concrete subjected to explosion was numerically studied. On the basis of comparative analysis of different material models, numerical algorithms and selection of appropriate mesh size, the proposed numerical algorithm and material models along with the corresponding parameters were firstly validated by comparing the numerically simulated spherical charge detonated in a concrete target with the corresponding test data in terms of peak stress and stress-time history. Then the attenuation of stress wave subjected to spherical charge detonated in concrete was numerically investigated, in which the radial and circumferential stress-time histories at different scaled distances were analyzed in detail to reveal the mechanism of stress wave attenuation. The numerical results were fitted to develop an empirical formula for the peak stress of the free-field compression wave in concrete at the close zone with the aid of dimensional analysis. Besides, the applicability of the developed empirical formula was also discussed. The influence of charge buried depth on peak stress in concrete at different distances was also numerically studied to develop a quantitative relationship between charge buried depth, distance and the so-called coupling factor. Numerical results demonstrate that the Kong-Fang concrete material model can be used to simulate the attenuation of explosion stress wave in concrete with good accuracy. The influence of the charge buried depth and the distance from charge the center on the coupling factor of peak stress can be quantified by defining the mass coefficient and coupling constant. The empirical formula for peak stress of compression wave in concrete at the close zone is appropriate for varied charge buried depth, distance and concrete strength. The present numerical results are useful for blast-resistant design and can provide a reliable reference for estimating the damage degree of concrete caused by explosion.
- peak stress,
- Kong-Fang model,
- concrete,
- explosion wave,
- charge buried depth

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References(33)

References

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