Behaviors of Metal-based Reactive Fragments Penetrating Spaced Aluminum Targets

doi:10.12382/bgxb.2022.0232

Abstract

Abstract:

Ballistic impact experiments are conducted on metal-based reactive fragments impacting spaced targets to investigate the post-target debris cloud and damage effect behaviors of the reactive fragments, and to reveal the mechanism of their penetration. By observing the perforation mode of spaced target and the action behavior of fragments, we combine the breakage theory of target penetration, energy conservation law, and the reactivation response behaviors of reactive fragments to analyze and discuss the behaviors of reactive fragments penetrating spacer aluminum targets. The results show that the front target is plugging, and the rear target mainly presents the composite mode of center penetration and debris impact due to the kinetic energy-chemical energy coupling damage of post-target debris cloud. With increasing impact velocity, the reactive of reactive fragments increases. The theoretical model of the reactive fragments’ post-target debris cloud is established, and the evolution law of debris cloud is obtained. At different impact velocities, the unit debris kinetic energy is negatively correlated with unit reaction mass at the position of the critical through aperture.

Key words: metal-based reactive fragments, spaced aluminum targets, ballistic gun experiment, debris cloud

CLC Number:

TJ012.4

ZHOU Sheng, ZHANG Jiahao, YU Qingbo. Behaviors of Metal-based Reactive Fragments Penetrating Spaced Aluminum Targets[J]. Acta Armamentarii, 2023, 44(8): 2263-2272.

Figures/Tables 13

Fig.1 Reactive fragments and quasi-static compressive stress-strain curves

Table 1 Mechanical properties of reactive fragments

弹性模量/GPa	屈服强度/MPa	断裂强度/MPa	断裂延伸率/%
21	1128	1568	10.1

Fig.2 Experimental target and target structure schematic

Fig.3 Schematic and image of the experimental test system

Table 2 Image of typical target damage area

Table 3 Experimental results of reactive fragments damage to spacer target

序号	碰撞速度/ (m·s^-1)	破片截面积/mm²	前靶毁伤面积/mm²	前靶穿孔模式	后靶毁伤面积/mm²	贯穿孔半径/mm	毁伤区半径/mm	后靶穿孔模式
1	778	50.2655	64.3774	冲塞型	50.2359	4.12	7.50	花瓣型
2	780	50.2655	63.2158	冲塞型	50.4183	4.12	7.51	花瓣型
3	1017	50.2655	54.6541	冲塞型	71.2300	5.30	16.00	花瓣型
4	1024	50.2655	55.1223	冲塞型	72.6291	5.32	16.04	花瓣型
5	1489	50.2655	86.5922	冲塞型	332.3194	11.00	31.49	花瓣型
6	1493	50.2655	86.9156	冲塞型	334.4931	11.10	34.51	花瓣型

Fig.4 Typical high-speed photographs

Fig.5 Process of reactive fragments penetrating the plate

Fig.6 Evolution of post-target debris cloud with different impact velocities

Fig.7 Fragmentation, activation and sparse wave unloading size of reactive fragments

Fig.8 Relationship between the total kinetic energy and activation degree

Fig.9 Schematic diagram of target plate acted by debris cloud

Fig.10 Unit debris kinetic energy and reaction mass at the position of rear target through aperture at different impact velocities

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