Dynamic Response Mechanism of Aluminum Foam Sandwich Plate with Cavity under Shallow-buried Explosive Loading

doi:10.12382/bgxb.2022.1195

Abstract

Abstract:

The cavity structure can effectively protect the rear area. In order to study the influence of the cavity structure on the energy attenuation performance of aluminum foam sandwich plate structure, the influence of the cavity size on the deflection of sandwich plate, the secondary shock wave behind the plate and the energy absorption efficiency of aluminum foam core layer under the experimental conditions of explosion loading of shallow-buried explosive is investigated by changing the diameter and thickness of the cavity in the aluminum foam core layer. The results show that the intensity of secondary shock wave behind the structure decreases significantly with the increase of the cavity thickness in the aluminum foam. When the cavity diameter is 0.3D and its thickness is 1/3H, the central pressure intensity is the lowest, which is about 63% of that of the non-porous aluminum foam plate. The volume strain is the largest when the cavity diameter is 0.3D and its thickness ias 2/3H, which is 61% higher than that of the control group. The surface cavity structure can effectively enhance the energy absorption efficiency of aluminum foam sandwich structure.

Key words: aluminum foam, shallow-buried explosive, cavity structure, anti-explosion performance

CLC Number:

O383.1

LIU Wei, MA Honghao, XU Qinming, YAO Xiangyang, ZHAO Yong, YANG Ke, YANG Hui, SHEN Zhaowu. Dynamic Response Mechanism of Aluminum Foam Sandwich Plate with Cavity under Shallow-buried Explosive Loading[J]. Acta Armamentarii, 2023, 44(12): 3613-3621.

Figures/Tables 10

Fig.1 Structure diagram of aluminum foam sandwich plate with cavity

Fig.2 Schematic diagram of experimental structure device

Fig.3 Layout diagram of PVDF sensors

Fig. 4 Aluminum foam profiles of cavity structure under explosive loading

Fig.5 Experimental sample profile

Fig.6 Scanned results of face-sheets and back sheet

Fig.7 The effects of different conditions on compression ratio

Fig.8 The effects of different cavity diameters and thicknesses on volume strain

Table 1 The effects of diameter and thickness of aluminum foam cavity on the intensity of secondary shock wave behind the structureMPa

样本编号	距中心距离/mm
样本编号	0	1.5	3.0	4.5	6.0	7.5
DZ	1.47	1.19	0.66	0.46	0.30	0.28
WK-6-00	1.09	1.09	0.77	0.58	0.31	0.23
WK-6-13	1.00	1.03	0.89	0.72	0.47	0.25
WK-6-23	1.23	1.19	1.03	0.96	0.56	0.28
WK-9-00	1.17	1.02	0.86	0.66	0.41	0.18
WK-9-13	1.19	1.08	0.98	0.9	0.58	0.27
WK-9-23	1.36	1.11	0.78	0.41	0.51	0.12
WK-12-00	1.14	0.73	0.64	1.02	1.11	0.45
WK-12-13	0.92	0.75	0.50	0.63	0.65	0.45
WK-12-23	1.21	0.97	0.55	0.75	0.69	0.32

Fig.9 Pressure peak of secondary shock wave behind the structure

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