Influence of longitudinal magnetic field on coefficient ofultimate elongation of shaped charge jet

Ma Bin; Huang Zhengxiang; Zu Xudong; Xiao Qiangqiang; Jia Xin

doi:10.11883/1001-1455(2016)06-0759-08

Volume 36 Issue 6

Oct. 2018

Turn off MathJax

Article Contents

Abstract

References

Article Navigation > Explosion And Shock Waves > 2016 > 36(6): 759-766

Ma Bin, Huang Zhengxiang, Zu Xudong, Xiao Qiangqiang, Jia Xin. Influence of longitudinal magnetic field on coefficient ofultimate elongation of shaped charge jet[J]. Explosion And Shock Waves, 2016, 36(6): 759-766. doi: 10.11883/1001-1455(2016)06-0759-08

Citation:

Ma Bin, Huang Zhengxiang, Zu Xudong, Xiao Qiangqiang, Jia Xin. Influence of longitudinal magnetic field on coefficient ofultimate elongation of shaped charge jet[J]. Explosion And Shock Waves, 2016, 36(6): 759-766. doi: 10.11883/1001-1455(2016)06-0759-08

Citation:

PDF( 3811 KB)

Influence of longitudinal magnetic field on coefficient ofultimate elongation of shaped charge jet

doi: 10.11883/1001-1455(2016)06-0759-08

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

Received Date: 2015-03-31
Rev Recd Date: 2015-06-11
Publish Date: 2016-11-25

Abstract

Abstract

The coefficient of the ultimate elongation is one of significant parameters related with theoretical calculations of a shaped charge jet (SCJ). Based on the effect of a longitudinal magnetic field on the stress-strain of SCJ, and following the motion equation and the plastic instability condition, the formula of the coefficient of the ultimate elongation of a shaped charge inside the magnetic field was obtained and, using this formula, the ratio of the coefficient of the ultimate elongation was calculated respectively with and without the existence of a magnetic field. In addition, the theoretical model was verified through the experiments with two different standoffs. The results indicate that the electromagnetic force arising from the deformation of the SCJ due to the magnetic field that has penetrated into its material inhibits the development of the necking, and extends the stretching stage before the SCJ breaks up into particles, thus increasing the coefficient of the ultimate elongation. Predictions from the theoretical calculation are in good agreement with the data obtained from the experiments.
- fluid mechanics,
- coefficient of ultimate elongation,
- longitudinal magnetic field,
- shaped charge jet,
- stability

FullText(HTML)

References(19)

References

[1]	Walters W P, Zukas J A. Fundamentals of shaped charges[M]. John Wiley, 1989.
[2]	Chou P C, Carleone J. The stability of shaped-charge jets[J]. Journal of Applied Physics, 1977, 48(10):4187-4195. doi: 10.1063/1.323456
[3]	Babkin A V, Ladov S V, Marinin V M, et al. Regularities of the stretching and plastic failure of metal shaped-charge jets[J]. Journal of Applied Mechanics and Technical Physics, 1999, 40(4):571-580. doi: 10.1007/BF02468430
[4]	Fedorov S V, Babkin A V, Ladov S V, et al. Possibilities of controlling the shaped-charge effect by electromagnetic actions[J]. Combustion, Explosion and Shock Waves, 2000, 36(6):792-808. doi: 10.1023/A:1002867025761
[5]	Hirsch E. A model explaining the rule for calculating the break-up time of homogeneous ductile metals[J]. Propellants, Explosives, Pyrotechnics, 1981, 6(1):11-14. doi: 10.1002/(ISSN)1521-4087
[6]	Hirsch E. A formula for the shaped charge jet breakup-time[J]. Propellants, Explosives, Pyrotechnics, 1979, 4(5):89-94. doi: 10.1002/(ISSN)1521-4087
[7]	Chou P C, Flis W J. Recent developments in shaped charge technology[J]. Propellants, Explosives, Pyrotechnics, 1986, 11(4):99-114. doi: 10.1002/(ISSN)1521-4087
[8]	Curtis J P. Axisymmetric instability model for shaped charge jets[J]. Journal of Applied Physics, 1987, 61(11):4978-4985. doi: 10.1063/1.338317
[9]	Hennequin E. Modelling of the shaped charge jet break-up[J]. Propellants, Explosives, Pyrotechnics, 1996, 21(4):181-185. doi: 10.1002/(ISSN)1521-4087
[10]	Romero L A. The instability of rapidly stretching plastic jets[J]. Journal of Applied Physics, 1989, 65(8):3006-3016. doi: 10.1063/1.342718
[11]	Babkin A V, Ladov S V, Marinin V M, et al. Characteristics of inertially stretching shaped-charge jets in free flight[J]. Journal of Applied Mechanics and Technical Physics, 1997, 38(2):171-176. doi: 10.1007/BF02467897
[12]	Littlefield D L, Powell J D. The effect of electromagnetic fields on the stability of a uniformly elongating plastic jet[J]. Physics of Fluids A: Fluid Dynamics, 1990, 2(2):2240. http://cn.bing.com/academic/profile?id=eb3d9e9f7284e2e08798cb78960bc5ba&encoded=0&v=paper_preview&mkt=zh-cn
[13]	Fedorov S V, Babkin A V, Ladov S V. Salient features of inertial stretching of a high-gradient conducting rod in a longitudinal low-frequency magnetic field[J]. Journal of Engineering Physics and Thermophysics, 2001, 74(2):364-374. doi: 10.1023/A:1016656522643
[14]	Fedorov S V. Magnetic-field amplification in metal shaped-charge jets during their inertial elongation[J]. Combustion, Explosion and Shock Waves, 2005, 41(1):106-113. doi: 10.1007/s10573-005-0012-4
[15]	Fedorov S V, Babkin A V, Ladov S V. Influence of the magnetic field produced in the liner of a shaped charge on its penetrability[J]. Combustion, Explosion and Shock Waves, 1999, 35(5):598-599. doi: 10.1007/BF02674508
[16]	Tucker T J, Toth R P. EBW1: A computer code for the prediction of the behavior of electrical circuits containing exploding wire elements[R]. Albuquerque, NM, USA: Sandia Labs, 1975.
[17]	Singh M, Bola M S, Prakash S. Determination of dynamic tensile strength of metals from jet break-up studies[C]//Proceedings of the 19th International Symposium on Ballistics. Interlaken, Switzerland, 2001: 7-11.
[18]	Allison F E, Bryan G M. Cratering by a train of hypervelocity fragments[C]//Proceedings of 2nd Hypervelocity Impact Effects Symposium. 1957: 81.
[19]	Walters W P, Summers R L. An analytical model for the particulation of a jet from a shaped charge liner[J]. Propellants, Explosives, Pyrotechnics, 1995, 20(2):58-63. doi: 10.1002/(ISSN)1521-4087