Casing fracture and damage characteristics of an elliptical cross-section warhead under explosive loading

DENG Yuxuan; ZHANG Xianfeng; LIU Chuang; LIU Junwei; LI Pengcheng; SHENG Qiang; XIAO Chuan

doi:10.11883/bzycj-2023-0135

Volume 43 Issue 9

Sep. 2023

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DENG Yuxuan, ZHANG Xianfeng, LIU Chuang, LIU Junwei, LI Pengcheng, SHENG Qiang, XIAO Chuan. Casing fracture and damage characteristics of an elliptical cross-section warhead under explosive loading[J]. Explosion And Shock Waves, 2023, 43(9): 091412. doi: 10.11883/bzycj-2023-0135

Citation:

DENG Yuxuan, ZHANG Xianfeng, LIU Chuang, LIU Junwei, LI Pengcheng, SHENG Qiang, XIAO Chuan. Casing fracture and damage characteristics of an elliptical cross-section warhead under explosive loading[J]. Explosion And Shock Waves, 2023, 43(9): 091412. doi: 10.11883/bzycj-2023-0135

Citation:

DENG Yuxuan, ZHANG Xianfeng, LIU Chuang, LIU Junwei, LI Pengcheng, SHENG Qiang, XIAO Chuan. Casing fracture and damage characteristics of an elliptical cross-section warhead under explosive loading[J]. Explosion And Shock Waves, 2023, 43(9): 091412. doi: 10.11883/bzycj-2023-0135

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Casing fracture and damage characteristics of an elliptical cross-section warhead under explosive loading

doi: 10.11883/bzycj-2023-0135

1.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
China North Industries Corp., Beijing 100053, China

Received Date: 2023-04-15
Rev Recd Date: 2023-06-01

Available Online: 2023-06-01

Publish Date: 2023-09-11

Abstract

Abstract

In order to study the mechanism of fragmentation and damage characteristics of elliptical cross-section warhead under internal explosive loading, five types of warheads were designed with the same ratio of charge mass to casing mass but different ratio of minor axis to major axis, and static explosion tests were conducted. The detonation process of the warhead was recorded by high-speed camera, and the destruction capability of the warheads were quantified by measuring the cratering parameters of the witness targets, while the radial velocity distribution of the fragments was obtained by the velocity-measuring targets. The test results show that the radial velocity of the fragments of elliptical cross-section warhead logarithmically increases from the major axis direction to the minor axis direction. There is a significant velocity enhancement compared to circular cross-section warhead, when the ratio of minor to major axis is equal to 0.40, the enhancement reaches to an amazing 83%. The fragments near the major axis are subjected to slip detonation as the dominant driving effect, and the circumferential tensile stress inside the casing leads to tensile cracks on the inner surface of the fragments. At the same time, the tensile cracks disappear gradually as the ratio of minor to major axis increases. In the minor axis direction, the scattered detonation always dominated, and the casing is mainly subjected to radial compressive stresses, thus no tensile crack appears. In addition, due to the influence of rarefaction waves on the end face, the maximum destructive power of the warhead axially occurs at 1/4 of the distance from the non-detonation end. And in the radial direction, the damage power of fragment in the direction of minor axis is significantly greater than that in the major axis direction. Especially when the ratio of minor to major axis is equal to 0.40, the destructive power of the minor axis reaches 1.83 times that of the major axis, but the difference decreases with the increase of minor to major axis ratio.
- elliptical cross-section warhead,
- detonation drive,
- fragment,
- damage characteristics

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References(30)

References

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