Experimental study on the mitigation effects of confined-blast loading

KONG Xiangshao; WANG Zitang; KUANG Zheng; ZHOU Hu; ZHENG Cheng; WU Weiguo

doi:10.11883/bzycj-2020-0193

Volume 41 Issue 6

Jun. 2021

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Du Hong-mian, He Zhi-wen, Ma Tie-hua. Frequency domain characteristic of secondary instrument in the shock overpressure measurement system[J]. Explosion And Shock Waves, 2015, 35(2): 261-266. doi: 10.11883/1001-1455(2015)02-0261-06

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KONG Xiangshao, WANG Zitang, KUANG Zheng, ZHOU Hu, ZHENG Cheng, WU Weiguo. Experimental study on the mitigation effects of confined-blast loading[J]. Explosion And Shock Waves, 2021, 41(6): 062901. doi: 10.11883/bzycj-2020-0193

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Experimental study on the mitigation effects of confined-blast loading

doi: 10.11883/bzycj-2020-0193

1.
Green & Smart River-Sea-Going Ship, Cruise and Yacht Research Center, Wuhan University of Technology, Wuhan 430063, Hubei, China
2.
Department of Naval Architecture, Ocean and Structural Engineering, School of Transportation, Wuhan University of Technology, Wuhan 430063, Hubei, China

Received Date: 2020-06-11
Rev Recd Date: 2020-08-31

Available Online: 2021-05-13

Publish Date: 2021-06-05

Abstract

Abstract

The blast loading from an explosion in a confined space is quite different from that in an open environment. The detonation products of TNT can be fully mixed with the surrounding air, and release additional energy through combustion effect, resulting in a significantly increase of the reflected shockwaves and quasi-static pressure in the confined space.In order to investigate the mitigation effect of different atmosphere on explosion load in confined space, the experimental tests of TNT with three different charge masses were performed in a fully confined chamber filled with air, water mist and nitrogen, respectively. The explosive load pressure, temperature and the response characteristics of blast-loaded steel plates in the confined space were analyzed by theoretical calculation and experiment. The results show that both the water mist and the nitrogen can effectively reduce the reflected shock wave, the quasi-static pressure and the temperature in the confined chamber. The average reduction rate of quasi-static pressure is 36.0% and 51.7%, and the average reduction rate of temperature is 42.6% and 40.3%, respectively. The ideal gas state equation was used to calculate the theoretical value of quasi-static pressure in the confined space filled with nitrogen. It is found that the theoretical value is slightly larger than the experimental value, which is due to the insufficient combustion of detonation products in the test. The dynamic response of blast-loaded steel plates in water mist and nitrogen atmosphere is significantly lower than that in the air condition, and the residual deformation of the steel plate at 160 g TNT in water mist and air conditions, the attenuating effect of nitrogen is better than that of water mist. It is revealed that the mechanism of the water mist and nitrogen in mitigating the confined blast load and the subsequent dynamic response of structure is restraining the energy release from the combustion of the detonation products. The conclusions can provide references for the design of anti-blast structure.
- confined-blast loading,
- water mist,
- nitrogen,
- quasi-static pressure,
- dynamic response of steel plates

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References(24)

References

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