Design Technique for Calculating Functional Parameters of a Rotating Shaped Charge with Preliminary Heated Liner

The paper considers a separate issue of the shaped charge functioning, i.e., functioning of a rotating charge under preliminary thermal action on its liner. Estimates of two oppositely directed factors are provided: 1) increase in the shaped-charge jet dynamic plasticity (limit elongation coefficient); 2) increase in the jet susceptibility to centrifugal destruction. These factors are activated by preliminary thermal action on the shaped charge liner in the jet heated in excess of usual parameters. The so-called "thermal" increase in the limit elongation coefficient was estimated using empirical and theoretical dependences of this value on the shaped-charge jet parameters, and on the characteristics of its material. Strength dependence on temperature was accepted as linearly decreasing. Centrifugal factor was estimated based on the law of kinetic moment conservation taking into consideration the gradient nature of stretching and, up to a certain point, the radial thinning of jet elements. The moment of centrifugal and strength forces relationship reaching the critical value was accepted as the beginning of the jet element centrifugal destruction. From this time moment the jet radial extension started. The law of decompaction of its enlarging part was taken from studies previously conducted by the authors. It was demonstrated that the two considered factors acting in the opposite directions in a jet were in compliance with each other ensuring optimal preliminary heating of the liner and penetration effect with a local maximum

References

[1] Orlenko L.P., ed. Fizika vzryva. T. 2 [Explosion physics. Vol. 2]. Moscow, Fizmatlit Publ., 2002.

[2] Babkin A.V., Ladov S.V., Fedorov S.V. Behavior features of cumulative jets of composite powder liner in free flight. Oboronnaya tekhnika, 2007, no. 3-4, pp. 38--53 (in Russ.).

[3] Babkin A.V., Ladov S.V., Fedorov S.V. Analysis of influence of the sintered liner composition on the shaped-charge jet free flight behavior and its penetration capacity. Proc. 25th Int. Symp. Ballistics, 2010, vol. 2, pp. 959--966.

[4] Baskakov V.D., Zarubina O.V., Karnaukhov K.A., et al. Mathematical modelling of ideal flat jets impact. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2016, no. 2 (65), pp. 79--90 (in Russ.). DOI: https://doi.org/10.18698/1812-3368-2016-2-79-90

[5] Karnaukhov K.A., Baskakov V.D., Korenkov V.V., et al. Peculiarity of the shaped-charge liner collapse concerning the unevenness in its cross-section. J. Phys.: Conf. Ser., 2017, vol. 894, no. 1, art. 012039. DOI: https://doi.org/10.1088/1742-6596/894/1/012039

[6] Kolpakov V.I., Pletnev S.L. [The effect of liner pre-heating on efficiency of shaped charge]. Tez. dokl. IV mezhdunar. konf. Lavrent’yevskie chteniya po matematike, me-khanike i fizike [Abs. IV Int. Conf. Lavrentiev Readings on Mathematics, Mechanics and Physics]. Novosibirsk, IG SO RAS Publ., 1995, pp. 125 (in Russ.).

[7] Korenkov V.V., Obukhov A.S., Smelikov V.G. Increase of steel target penetration by charge with preliminary heated liner. Dvoynye tekhnologii, 1999, no. 4, pp. 53--54 (in Russ.).

[8] Babkin A.V., Ladov S.V., Fedorov S.V., et al. Maximum allowable parameters of pulsed thermal impact on ring systems with energetic material. Oboronnaya tekhnika, 2000, no. 1-2, pp. 35--40 (in Russ.).

[9] Babkin A.V., Bondarenko P.A., Fedorov S.V., et al. [Limitations of the possibilities for increasing penetration of shaped charge at pulsed heating its liner]. Ekstremal’nye sostoyaniya veshchestva. Detonatsiya. Udarnye volny. Tr. mezhdunar. konf. III Kharitonovskie tematich. nauch. chteniya [Extreme States of the Substance. Detonation. Shock Waves. Proc. Int. Conf. III Khariton Theme Readings]. Sarov, VNIIEF Publ., 2002, pp. 257--263 (in Russ.).

[10] Matrosov A.D., Babkin A.V., Ladov S.V., et al. Influence of magnetic fields on shaped charge performance. Trans. PPPS 2001, 2001, pp. 182--186. DOI: https://doi.org/10.1109/PPPS.2001.1002023

[11] Selivanov V.V., ed. Boepripasy. T. 1 [Ammunition. Vol. 1]. Moscow, BMSTU Publ., 2016.

[12] Marinin V.M., Babkin A.V., Kolpakov V.I. Calculation technique of cumulative charge performance parameters. Oboronnaya tekhnika, 1995, no. 4, pp. 34--39 (in Russ.).

[13] Babkin A.V., Rassokha S.S., Ladov S.V. On centrifugal destruction of gradient rods. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2010, no. S, pp. 182--195 (in Russ.).

[14] Babkin A.V., Rassokha S.S., Ladov S.V. Calculation method for functionality of the rotating shaped charges. Oboronnaya tekhnika, 2010, no. 1-2, pp. 23--30 (in Russ.).

[15] Johnson G.R., Cook W.H. A constitutive model and data for metals subjected to large strains, high strain rates and high temperatures. Proc. 7th Intern. Symp. Ballistics. Hague, Netherlands, 1983.

[16] Babkin A.V., Ladov S.V., Marinin V.M., et al. Regularities of the stretching and plastic failure of metal shaped-charge jets. J. Appl. Mech. Tech. Phys., 1999, vol. 40, iss. 4, pp. 571--580. DOI: https://doi.org/10.1007/BF02468430

[17] Svirskiy O.V., Vlasova M.A. Rating assessment of metals on the prospects of their use in cumulative charges liners. Izvestiya RARAN, 2006, no. 3 (48), pp. 83--88 (in Russ.).