Residual characteristics of moderately thick water-backed steel plates penetrated by high-velocity fragments

Chen Changhai; Hou Hailiang; Zhang Yuanhao; Dai Wenxi; Zhu Xi; Fang Zhiwei

doi:10.11883/1001-1455(2017)06-0959-07

Volume 37 Issue 6

Sep. 2017

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Chen Changhai, Hou Hailiang, Zhang Yuanhao, Dai Wenxi, Zhu Xi, Fang Zhiwei. Residual characteristics of moderately thick water-backed steel plates penetrated by high-velocity fragments[J]. Explosion And Shock Waves, 2017, 37(6): 959-965. doi: 10.11883/1001-1455(2017)06-0959-07

Citation:

Chen Changhai, Hou Hailiang, Zhang Yuanhao, Dai Wenxi, Zhu Xi, Fang Zhiwei. Residual characteristics of moderately thick water-backed steel plates penetrated by high-velocity fragments[J]. Explosion And Shock Waves, 2017, 37(6): 959-965. doi: 10.11883/1001-1455(2017)06-0959-07

Citation:

Chen Changhai, Hou Hailiang, Zhang Yuanhao, Dai Wenxi, Zhu Xi, Fang Zhiwei. Residual characteristics of moderately thick water-backed steel plates penetrated by high-velocity fragments[J]. Explosion And Shock Waves, 2017, 37(6): 959-965. doi: 10.11883/1001-1455(2017)06-0959-07

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Residual characteristics of moderately thick water-backed steel plates penetrated by high-velocity fragments

doi: 10.11883/1001-1455(2017)06-0959-07

1.
Department of Naval Architecture Engineering, Naval University of Engineering, Wuhan 430033, Hubei, China
2.
China Ship Development and Design Center, Wuhan 430064, Hubei, China

Received Date: 2016-04-12
Rev Recd Date: 2016-09-06
Publish Date: 2017-11-25

Abstract

Abstract

In this study we carried out ballistic tests to explore the residual characteristics of moderately thick water-backed steel plates penetrated by high-velocity fragments. Damage modes of projectiles as well as targets were analyzed. We compared the vertical and inclined water-backed steel plates penetrated by fragments in terms of instantaneous fragment velocities, moving trajectories and the pressure characteristics of induced incipient shockwaves. The results show that serious mushrooming deformation occur on the noses of the fragments during high-velocity penetration, and the dynamic supporting effect of water in the back of the steel plate should be considered in its examination. Damage modes of the water backed steel plates are mainly shear plugging, together with adiabatic shear effect available on the distal side of the perforation holes. In the earlier stage after the fragment perforating the water-backed steel plates, cavities and jets are produced. The cavity size and the jet intensity are both related to the initial velocities of the fragments entering the water, whereas both the cavity shape and the jet direction are affected by the inclined angle of the water-backed steel plates. After the perforation of the water-backed steelplates, the moving trajectories of the fragments will deflect, and the deflection direction is related to the initial velocities. Due to the dynamic supporting as well as the kinetic energy dissipation effects of water, the kinetic energy loss of the fragment perforating water-backed steel plates is greater than that perforating air-backed steel plates. The influence of the rarefaction wave on the pressure characteristics of incipient shock waves should be considered. Under the condition of the same initial fragment velocity, penetration of the vertical water-backed steel plates result in incipient shock waves with higher peak pressures than those resulting from the penetration of the inclined water-backed steel plates.
- high-velocity penetration,
- water-backed steel plate,
- residual characteristic,
- incipient shock wave

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References(12)

References

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