Damage characteristics of sandwich bulkhead under the impact of shock and high-velocity fragments

Hou Hai-liang; Zhang Cheng-liang; Li Mao; Hu Nian-ming; Zhu Xi

doi:10.11883/1001-1455(2015)01-0116-08

Volume 35 Issue 1

Feb. 2015

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Hou Hai-liang, Zhang Cheng-liang, Li Mao, Hu Nian-ming, Zhu Xi. Damage characteristics of sandwich bulkhead under the impact of shock and high-velocity fragments[J]. Explosion And Shock Waves, 2015, 35(1): 116-123. doi: 10.11883/1001-1455(2015)01-0116-08

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Hou Hai-liang, Zhang Cheng-liang, Li Mao, Hu Nian-ming, Zhu Xi. Damage characteristics of sandwich bulkhead under the impact of shock and high-velocity fragments[J]. Explosion And Shock Waves, 2015, 35(1): 116-123. doi: 10.11883/1001-1455(2015)01-0116-08

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Damage characteristics of sandwich bulkhead under the impact of shock and high-velocity fragments

doi: 10.11883/1001-1455(2015)01-0116-08

Department of Naval Architecture Engineering, Naval University of Engineering, Wuhan 430033, Hubei, China

Received Date: 2013-04-11
Rev Recd Date: 2014-09-06
Publish Date: 2015-01-25

Abstract

Abstract

In order to explore the design method of sandwich bulkhead subjected to the close blast load of missile-warhead, experiments were carried out to investigate the damage effect of sandwich bulkhead subjected to combined impact of shock and fragments using cast TNT and prefabricated fragments. The combined impact load of the shock and high-velocity fragments were analyzed. The failure modes of surface plate and sandwich core of the bulkhead were pointed out, and the protective mechanism of sandwich bulkhead were analyzed. Results show that the impact energy acted on the structure by the prefabricated fragments is far larger than that of shock under the close blast of cast TNT and prefabricated fragments, and should be the main load in the design of the bulkhead. Under combined impact of close-impact waves and high-velocity fragments, the deformation and failure modes of the front plate is large deformation, combined with large amounts of perforation holes, including large shearing plug caused by the dense fragments, perforation and craters caused by individual fragments. Large deformation is the main failure modes of back plate. Al₂O₃ tiles are badly fragmented. Part of the tile fragments splashed reversely and impact on the front plate. Fiber-reinforced composite laminates will generate large deformation including damage like fibers fracture and matrix cracking. In the design of sandwich bulkhead, the front plate should avoid transverse shearing failure and collision on the bullet-resistant core, the bullet-resistant core should avoid perforation failure, and the back plate should have enough strength to absorb the residual impact energy.
- mechanics of explosion,
- damage characteristics,
- shock,
- fragments,
- sandwich bulkhead

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References(18)

References

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