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

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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

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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

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References(19)

References

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