2083. Research on ricochet and its regularity of projectiles obliquely penetrating into concrete target

Jianfeng Xue1, Peihui Shen2, Xiaoming Wang3

School of Mechanical Engineering, Nanjing University of Science and Technology,
Nanjing, 210094, China

1Corresponding author

E-mail: 1xuejianfeng666@163.com, 2sphjy8@mail.njust.edu.cn, 3202xm@163.com

Received 6 January 2016; received in revised form 22 April 2016; accepted 29 June 2016

Abstract. To address the ricochet problem in penetration process, the mathematical model of projectile penetrating into concrete target is established according to the basic kinetic equation and surface layer mechanism. The motion trajectory of projectile nose is obtained. Experimental studies on projectiles with different nose penetrating into concrete targets are conducted to explain the ricochet problem. These studies analyze fifty-four penetration conditions under different initial velocities and oblique angles when the projectiles have flat, hemispherical, ogive noses and conical noses. The regularity and critical angles of ricochet are analyzed with different nose shapes at different velocities. Results show that the ricochet angle increases depending on nose sharp and penetration velocity. The factors affecting the ricochet from big to small were analyzed via orthogonal test. The results show that with increasing the velocity from 652 m/s to 1022 m/s, the critical angle increases from 44° to 66°. The order of factors affecting the ricochet from big to small is the shape of the nose, the material of the projectiles and the penetrating velocity respectively.

Keywords: explosion mechanism, oblique penetration, projectile, concrete target, ricochet, orthogonal experiment.

References

[1]        Qian Weizhang Mechanics of Perforation. Nation Defense Industry Press, Beijing, 1984.

[2]        Goldsmith W. Non-ideal projectile impact on targets: review. International Journal of Impact Engineering, Vol. 22, Issue 2, 1999, p. 95‑395.

[3]        Chen X.-W., Li. Q.-M. Deep penetration of a non-deformable projectile with different geometrical characteristics. International Journal of Impact Engineering, Vol. 27, Issue 6, 2002, p. 619‑637.

[4]        Li Jinghai Semi-armor-piercing blast of anti-ship missile warhead damage effects. Cruise Missile, Vol. 7, 2005, p. 52‑55, (in Chinese).

[5]        Segletes S. B. A model for rod ricochet. International Journal of Impact Engineering, Vol. 32, 2006, p. 1403‑1439.

[6]        Yu Wenli, Wang Tao, Dong Liang Computation of ricochet angle for oblique penetration of warhead into concrete targets. Journal of Projectiles, Rockets, Missiles and Guidance, Vol. 28, Issue 5, 2008, p. 109‑112, (in Chinese).

[7]        Wu Rongbo, Chen Zhigang, Wang Qinghua Numerical simulation on the impact effect of incidence angle impacting ricochet. Design and Research, Vol. 10, 2011, p. 18‑20, (in Chinese).

[8]        Guo Liuwei, Tan Duowang Numerical studies on the oblique penetration behavior of the projectile with cutting mechanism into a steel target. Chinese Journal of High Pressure Physics, Vol. 27, Issue 6, 2013, p. 833‑838, (in Chinese).

[9]        Hu Dean, Li Xia, Liang Chao Research on ricochet and its regularity of projectiles with different nose shapes penetrating steel target. Chinese Journal of Applied Mechanics, Vol. 29, Issue 6, 2012, p. 752‑756, (in Chinese).

[10]     Ning Jianguo Explosion and Impact Mechanics. National Defense Industry Press, Beijing, 2010, (in Chinese).

[11]     Forrestal M. J., Altman B. S., Cargile J. D., et al. An empirical equation for penetration depth of ogive-nose projectiles into concrete targets. International Journal of Impact Engineering, Vol. 42, Issue 9, 1994, p. 395‑405.

[12]     Zhang Fengguo, Li Enzuo A computational model for concrete subjected to large strains, high strain rates, and high pressures. Explosion and Shock Waves, Vol. 24, Issue 5, 2002, p. 198‑202, (in Chinese).