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Explosion Mechanics

Performance Calculation of Shaped Charges With Shear-Formed Liners

[+] Author and Article Information
S. S. Rassokha

e-mail: rassokha@gmail.com

S. V. Ladov

e-mail: sm4-2009@mail.ru

G. A. Kubyshkina

e-mail: vi.smartcookie@gmail.com

A. V. Babkin

e-mail: pc-os@bmstu.ru
Bauman Moscow State Technical University,
105005 2-nd Baumanskaya 5,
Moscow, Russia

1Corresponding author.

Manuscript received June 30, 2012; final manuscript received September 28, 2012; accepted manuscript posted January 9, 2013; published online April 19, 2013. Assoc. Editor: Bo S. G. Janzon.

J. Appl. Mech 80(3), 031703 (Apr 19, 2013) (6 pages) Paper No: JAM-12-1286; doi: 10.1115/1.4023340 History: Received June 30, 2012; Revised September 28, 2012; Accepted January 09, 2013

Production of shear-formed liners for rotating shaped charges is of interest since it causes the jet self-spinning effect, which drastically affects the penetration process. A novel four-part methodology for calculating the performance parameters of such charges is suggested. First, the liner strained state is related to the feed rate and mandrel angular velocity during the shear-forming process. Second, based on the polycrystal plasticity theory, a methodology for determining the liner's plastic anisotropy parameters depending on its strained state is realized. Third, a general dependence of the jet angular velocity on the liner plastic anisotropy parameters is obtained. The fourth part presents the methodology of shaped charge performance calculation with respect to spinning effects. The results of calculations performed according to the suggested methodology are in good agreement with experimental data. Calculations also show that the penetration depth increases 9% to 15% compared to a spinning shaped charge with a drawn liner (i.e., without the self-spinning effect) when the self-spinning jet rotates oppositely to the shaped charge. When they rotate in the same direction, penetration depth decreases critically (more than 50%).

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Figures

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Fig. 1

Scheme of a shaped charge (a) and its functional principle without (b) and with rotation (c)

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Fig. 2

Scheme of liner shear-forming in LS-DYNA calculation

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Fig. 3

Orientation angle of strain tensor principal axes dependence on the mandrel angular velocity (at s = 0.009 m/s)

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Fig. 4

Orientation angle of strain tensor principal axes dependence on the rollers feed rate (at n = 1400 rpm)

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Fig. 5

Lankford parameter dependence on virtual specimen orientation angle

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Fig. 6

Comparison of experimental data [1] with the results obtained with respect to different destruction criteria

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Fig. 7

Experimental and calculated values of angular velocity that optimally compensates self-spinning as a function of roller feed rate during shear-forming

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