Investigation on tungsten spheres penetrating into pine target covered with body armor

TANG Changzhou; ZHI Xiaoqi; GAO Feng; YU Yongli

doi:10.11883/bzycj-2020-0309

Volume 41 Issue 6

Jun. 2021

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TANG Changzhou, ZHI Xiaoqi, GAO Feng, YU Yongli. Investigation on tungsten spheres penetrating into pine target covered with body armor[J]. Explosion And Shock Waves, 2021, 41(6): 063302. doi: 10.11883/bzycj-2020-0309

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TANG Changzhou, ZHI Xiaoqi, GAO Feng, YU Yongli. Investigation on tungsten spheres penetrating into pine target covered with body armor[J]. Explosion And Shock Waves, 2021, 41(6): 063302. doi: 10.11883/bzycj-2020-0309

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Investigation on tungsten spheres penetrating into pine target covered with body armor

doi: 10.11883/bzycj-2020-0309

1.
College of Mechatronics Engineering, North University of China, Taiyuan 030051, Shanxi, China
2.
Inner Mongolia North Heavy Industries Group Co. Ltd., Baotou 014033, Inner Mongolia, China
3.
Jilin Jiangji Special Industries Co. Ltd., Jilin 132021, Jilin, China

Received Date: 2020-08-31
Rev Recd Date: 2020-12-24

Available Online: 2021-06-01

Publish Date: 2021-06-05

Abstract

Abstract

It is one of the future development directions to use small tungsten alloy spherical fragments in individual warhead. In order to investigation the penetration performance of small tungsten spheres against human simulation target covered with body armor, taking a 25 mm thick pine target of common international standards as the human simulation target, the experiment of small tungsten spheres penetrating into 25 mm thick pine target covered with third level body armor was carried out by a 12.7 mm ballistic gun. On this basis, the experiment was simulated by LS-DYNA3D software where the penetration process and failure mechanism were analyzed, and the influence of the mass change of tungsten spheres on energy absorption of target and ballistic limit were studied. According to dimensional analysis, energy formula of tungsten spheres penetrating into pine target covered with body armor was established, and the ballistic limit formula of tungsten spheres was deduced. The investigation results show that the ballistic limits of small tungsten spheres with the mass of 0.17, 0.21 and 0.44 g penetrating into the pine target covered with body armor are 742.3, 692.9 and 570.1 m/s, respectively. In the process of penetration, matrix crack, fiber breakage and tensile delamination are the main failure modes of body armor, and the damage similar to the "cross" shape appears on the fiber layer. However, the failure modes of pine target are mainly shear and plug spalling. The ballistic limit of tungsten sphere tends to decrease in the form of power function and energy absorption efficiency of target decreases gradually when the mass of tungsten sphere is increased. The calculated values of energy formula and ballistic limit formula of tungsten spheres penetrating into target are in good agreement with the experimental values, which can be used to calculate the energy of penetrating into target at different initial velocities and the ballistic limit of tungsten spheres with different mass.
- tungsten sphere,
- body armor,
- pine target,
- ballistic limit,
- numerical simulation,
- dimensional analysis

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References(23)

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