Failure modes and response characteristics of finite-thickness aluminum targets under normal penetration of elliptical cross-section projectiles

LIU Junwei; ZHANG Xianfeng; ZHAO Yaoyao; WEI Haiyang; LIU Chuang; LI Pengcheng

doi:10.11883/bzycj-2022-0249

Volume 42 Issue 12

Dec. 2022

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LIU Junwei, ZHANG Xianfeng, ZHAO Yaoyao, WEI Haiyang, LIU Chuang, LI Pengcheng. Failure modes and response characteristics of finite-thickness aluminum targets under normal penetration of elliptical cross-section projectiles[J]. Explosion And Shock Waves, 2022, 42(12): 123301. doi: 10.11883/bzycj-2022-0249

Citation:

LIU Junwei, ZHANG Xianfeng, ZHAO Yaoyao, WEI Haiyang, LIU Chuang, LI Pengcheng. Failure modes and response characteristics of finite-thickness aluminum targets under normal penetration of elliptical cross-section projectiles[J]. Explosion And Shock Waves, 2022, 42(12): 123301. doi: 10.11883/bzycj-2022-0249

Citation:

LIU Junwei, ZHANG Xianfeng, ZHAO Yaoyao, WEI Haiyang, LIU Chuang, LI Pengcheng. Failure modes and response characteristics of finite-thickness aluminum targets under normal penetration of elliptical cross-section projectiles[J]. Explosion And Shock Waves, 2022, 42(12): 123301. doi: 10.11883/bzycj-2022-0249

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Failure modes and response characteristics of finite-thickness aluminum targets under normal penetration of elliptical cross-section projectiles

doi: 10.11883/bzycj-2022-0249

1.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
Jiangsu Yongfeng Machinery Co. Ltd., Huai’an 211722, Jiangsu, China
3.
Beijing Institute of Space Long March Vehicle, Beijing 100074, China

Received Date: 2022-06-08
Rev Recd Date: 2022-08-25

Available Online: 2022-09-16

Publish Date: 2022-12-08

Abstract

Abstract

By means of a 30-mm-caliber ballistic gun platform, a series of experiments were carried out on 2A12 aluminum targets subjected to normal penetration by three kinds of 30CrMnSi2A steel projectiles with different elliptical cross-section shapes in the striking velocity range from 200 m/s to 600 m/s. The residual velocities of the projectiles and the failure modes of the targets were experimentally obtained. Based on the experimental results, the corresponding numerical models were established and verified. And the influences of the major-to-minor axis length ratios of the projectile cross-sections on the failure modes and response characteristics of the targets were systematically analyzed. The results show as follows. The maximum cross-sectional areas of the projectiles are the main factor affecting the residual velocities of the projectiles, while the major-to-minor axis length ratios of the projectile cross-sections have little effect on the residual velocities. Therefore, in engineering applications, the engineering model for the circular cross-section projectile penetrating a target can be directly used to calculate the residual velocity of the elliptical cross-section projectile with the same maximum cross-sectional area. In addition, under normal penetration of the circular cross-section projectiles, the sizes, shapes and distribution of the petals induced at the back faces of the targets are uniform. However, under normal penetration of the elliptical cross-section projectiles, as the major-to-minor axis length ratios of the projectile cross-sections increase, the numbers of the petals induced at the back faces of the targets increase and the petal sizes decrease, and the petal numbers and the uplifted height in the minor axis direction are greater than those in the major axis direction. The radial displacement, radial stress and tangential stress of the targets under the normal penetration of the elliptical cross-section projectiles are obviously different from those of the targets under the normal penetration of the circular cross-section projectiles. Under normal penetrations of the circular cross-section projectiles, the above response characteristics of the targets change basically the same along the circumferential directions and the targets are under simple compression states with the tangential stress of zero. But, under normal penetrations of the elliptical cross-section projectiles, the stress states of different points of the targets are closely related to the major-to-minor axis length ratios and the circumferential angles of the projectiles, and the targets are subjected to the coupling effects of the compression and shear stresses.
- aluminum target,
- elliptical cross-section projectile,
- major-to-minor axis length ratio,
- residual velocity,
- normal penetration,
- radial displacement,
- radial stress,
- tangential stress

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References(26)

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