Engineering Journal: Science and InnovationELECTRONIC SCIENCE AND ENGINEERING PUBLICATION
Certificate of Registration Media number Эл #ФС77-53688 of 17 April 2013. ISSN 2308-6033. DOI 10.18698/2308-6033
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Article

Manifestation of the effect of shock wave desensitization upon projectile detonation initiation in explosive thin layers

Published: 30.04.2015

Authors: Kobylkin I.F., Petukov A.V.

Published in issue: #3(39)/2015

DOI: 10.18698/2308-6033-2015-3-1383

Category: Mechanics | Chapter: Mechanics of Liquid, Gas, and Plasma

The article describes numerical modeling detonation initiation in shielded thin layers of explosives exposed to high-speed projectiles with regard to their shock-wave desensitization occurring due to their pre-compression by the shock wave generated at the initial stage of projectile penetration in the shielded layer of explosive. In the course of solving the problem by using LS-DYNA it was found that due to lack of accountability of shock wave desensitization effect in Lee-Tarver kinetics, integrated into the program LS-DYNA, it is not possible to reproduce the experimental fact of existence of the maximum screen thickness, above which detonation of the charge PVV-12M, of 6 mm thick is not initiated when exposed to the projectile with the diameter of 17.5 mm, at the speed of 2.21 kmps. To account for the effect of shock wave desensitization in problems of detonation initiation two-dimensional numerical solver of problems of mechanics of compressible solid continuum "Erudit", developed by S. V. Fedorov in the BMSTU, was used. Modernized Lee-Tarver kinetics of explosive decomposition, regarding for the possibility of desensitization of explosives under non-monotonic loading, was integrated into this solver. The developed method of numerical simulation allows the experimental data to be reproduced. As the calculations showed the detonation initiation doesn't occur under the projectile influence on a shielded thin layer of PVV-12M mm with the thickness of 6 mm and a faceplate thickness of 7 mm, but at a thickness of 6 mm detonation initiation occurs, which is consistent with experimental data.


References
[1] Orlenko L.P., ed. Fizika vzryva [Physics of Explosion]. Vol. 2. Moscow, FIZMATLIT Publ., 2002, 656 p.
[2] Kobylkin I.F. Boepripasy i vysokoenergeticheskie kondensirovannye sistemy - Ammunition and high-energy condensed systems, 2008, no. 2, pp. 50-56.
[3] Kobylkin I.F., Selivanov V.V. Vozbuzhdenie i rasprostranenie vzryvnykh prevrashcheniy v zaryadakh vzryvchatykh veshchestv [Initiation and Propagation of Explosive Transformations in an Explosive Charge]. Moscow, BMSTU Publ., 2015, 354 p.
[4] Orlenko L.P., ed. Fizika vzryva [Physics of Explosion]. Vol. 1. Moscow, FIZMATLIT Publ., 2002, 823 p.
[5] Urtiew P.A., Vandersall K.S., Tarver C.M. Shock initiation experiments and modeling of composition B and C-4. The 13th International Detonation Symposium. Norfolk (USA), 2006, pp. 632-642.
[6] Kobylkin I.F., Vyshinskiy P.N., Dorokhov N.S. Initsiirovanie detonatsii v tonkikh sloyakh vzryvchatykh veschestv, razmeshchennykh mezhdu metallicheskimi plastinami pri vozdeystvii kompaktnykh udarnikov [Initiation of Detonation of Explosives in Thin Layers, Placed between the Metal Plates under the Action of Compact Projectiles]. In: Trudy mezhdunarodnoy konferentsii "XI Kharitonovskie tematicheskie nauchnye chteniya". Ekstremalnye sostoyaniya veshchestva. Detonatsiya. Udarnye volny. [Proceedings of the International conference: XI Kharitonov Memorial Topical Scientific Lectures. Extreme States of Matter. Detonation. Shock Waves]. Sarov, 2009, pp. 100-105.
[7] Veldanov V.A., Markov V.A., Pusev V.I., Ruchko A.M., Sotskiy M.Yu., Fedorov S.V. Zhurnal tekhnicheskoy fiziki - Journal of Technical Physics, 2011, vol. 81, no. 7, pp. 94-104.
[8] DeOliveira G., Kapila A.K., Schwendeman D.W., Bdzil J.B., Henshow W.D., Tarver C.M. Detonation Difraction, Dead Zones and Ignition Model. The 13th International Detonation Symposium. USA, 2006, pp. 534-542.
[9] Vandersall K., Garsia F., Tarver G., Fried L. Shock Desensitization Experiments and Reactive Flow Modeling on Self-Sustaining LX-17 Detonation Waves. The 15th International Detonation Symposium. USA. 2014. pp. 114-122.