Protection Performance of Double-wall Structure of Al-plate Subjected to Impact Effect of High Velocity Projectiles Based on Kinetic Energy Dissipation

doi:10.11901/1005.3093.2017.421

Chinese Journal of Materials Research

2018, Vol. 32

Issue (4): 241-246 DOI: 10.11901/1005.3093.2017.421

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Protection Performance of Double-wall Structure of Al-plate Subjected to Impact Effect of High Velocity Projectiles Based on Kinetic Energy Dissipation

Gongshun GUAN¹(

), Xunyang DAI¹, Heshi GUAN²

1 Department of Astronautics Engineering, Harbin Institute of Technology, Harbin 150080, China
2 School of Electrical Engineering & Automation, Harbin Institute of Technology, Harbin 150080, China;

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Gongshun GUAN, Xunyang DAI, Heshi GUAN. Protection Performance of Double-wall Structure of Al-plate Subjected to Impact Effect of High Velocity Projectiles Based on Kinetic Energy Dissipation. Chinese Journal of Materials Research, 2018, 32(4): 241-246.

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Abstract

By analyzing characteristics of the kinetic energy consumption of single Al-plate and double-wall structure of Al-plate, which were just subjected to dynamic impact effect of an Al-sphere, the protection performance of the double-wall structure against the impact effect of high velocity projectiles is investigated in terms of the critical impact kinetic energy for the failure of the single Al-plate by the impact conditions that the projectile sphere was broken or not when it hit. Meanwhile, the experimental verification of the protection performance of the typical protective structures is carried out. Results show that the critical impact kinetic energy causing the single Al-plate to failure is approximately constant for a certain thickness of the plates. After penetrating the first wall, the residual kinetic energy of the projectile is proportionally reduced from the initial impact kinetic energy for the case of double-wall structure of Al-plate. In the range of impact velocities corresponding to the occurrence of shot fragments, the greater in diameter of the subsequent projectile fragment might cause the perforation failure of the rear wall of the double-wall structure of Al-plate, thus which should possessed the greater proportion of the sum residual kinetic energy of the total fragments in the secondary debris cloud.

Key words: metallic materials double-wall structure high velocity impact critical kinetic energy protection performance

Received: 08 July 2017

Fund: Supported by National Natural Science Foundation of China (No. 11172083)

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Fig.1 Relationship between ν_r and ν₀

Table 1 Comparison between the calculated results and the experimental results of the residual velocity

Table 2 Comparison between the calculated results and the experimental results of the ballistics limit velocity

Fig.2 Relationship between ν_c and d_p in the range of ballistic impact velocity

Table 3 Calculated results of the limit impact kinetic energy

Fig.3 Relationship between E_h and ν₀ in the shatter range

Fig.4 Relationship between E_e/E_hand v₀ in the shatter range

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