13 / 14
Проявление эффекта ударно-волновой десенсибилизации…
13
Manifestation of the effect of shock wave desensitization
upon projectile detonation initiation in explosive thin layers
© I.F. Kobylkin, A.V. Petukov
Bauman Moscow State Technical University, Moscow, 105005, Russia
The article describes numerical modeling detonation initiation in shielded thin layers of
explosives exposed to high-speed projectiles with regard to their shock-wave desensitiza-
tion 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 initia-
tion 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 desensiti-
zation of explosives under non-monotonic loading, was integrated into this solver. The
developed method of numerical simulation allows the experimental data to be repro-
duced. As the calculations showed the detonation initiation doesn’t occur under the pro-
jectile 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.
Keywords:
detonation initiation, shock-wave,
desensitization, numerical modeling, kinet-
ics of decomposition, explosive thin layer.
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