Dynamic response and energy absorption mechanism of metallic tube-core sandwich panels subjected to blast loading

ZOU Penglai1, CAI Lujun1, ZHANG Wei1, 2, 3, LI Yanhui1, ZHONG Dongwang1

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (18) : 1-11.

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (18) : 1-11.

Dynamic response and energy absorption mechanism of metallic tube-core sandwich panels subjected to blast loading

  • ZOU Penglai1,CAI Lujun1,ZHANG Wei1,2,3,LI Yanhui1,ZHONG Dongwang1
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Abstract

The thin-walled metallic tube-core sandwich structures with convenient preparation, low cost and the ability to form significant plastic deformation have broad application prospects in the field of impact protection. In this paper, the novel metallic tube-core sandwich panels with geometrically asymmetric face-sheets and transverse density gradient distribution of tubes are designed. The dynamic response and energy absorption mechanism of the sandwich panels are studied numerically. The dynamic response process and characteristics of metallic tube-core sandwich panels are obtained, and the effects of detonation height, explosive mass, mass distribution of the panel and transverse density gradient distribution of the tubes on the deformation and energy absorption are discussed. The results show that the dynamic response process of the metallic tube-core sandwich panels can be divided into three stages: core compression, overall deformation, and elastic deformation recovery. With the increase of explosive mass and the detonation height, the central displacement of the back face-sheet of the sandwich panel increases and the energy absorption ratio of the tube-core layer decreases. When keeping the total thickness of the face-sheet unchanged, the sandwich panel with thick front face-sheet and thin back face-sheet has strong ability to absorb energy and resist deformation. The sandwich panel with positive density gradient distribution of cores has strong ability to resist deformation, and the sandwich panel with the negative density gradient distribution of cores has strong ability to absorb energy. The application of the metallic tube-core sandwich panel with an appropriate increase in the thickness ratio of the front and back face-sheets and a positive density gradient distribution of the tubes can better disperse the blast shock wave, enhance the energy absorption efficiency of core layer, and obtain better anti-blast effect.

Key words

Tube-core sandwich structure / Gradient / Asymmetry / Blast resistance / Energy absorption

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ZOU Penglai1, CAI Lujun1, ZHANG Wei1, 2, 3, LI Yanhui1, ZHONG Dongwang1. Dynamic response and energy absorption mechanism of metallic tube-core sandwich panels subjected to blast loading[J]. Journal of Vibration and Shock, 2024, 43(18): 1-11

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