Measurements using Velocity Interferometer System for Any Reflector (VISAR) were performed for three high explosives at densities slightly above the natural loose-packed densities. The velocity histories at the explosive/window interface demonstrate that the grain size of the explosives plays an important role. Fine-grained materials produced rather smooth records with reduced von Neumann spike amplitudes. For commercial coarse-grained specimens, the chemical spike (if detectable) was more pronounced. This difference can be explained as a manifestation of partial burn up. In fine-grained explosives, which are more sensitive, the reaction can proceed partly within the compression front, which leads to a lower initial shock amplitude. The reaction zone was shorter in fine-grained materials because of higher density of hot spots. The noise level was generally higher for the coarse-grained explosives, which is a natural stochastic effect of the highly non-uniform flow of the heterogeneous medium. These results correlate with our previous data of electrical conductivity diagnostics. Instead of the classical Zel'dovich–von Neumann–Döring profiles, violent oscillations around the Chapman–Jouguet level were observed in about half of the shots using coarse-grained materials. We suggest that these unusual records may point to a different detonation wave propagation mechanism.
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21 February 2016
Research Article|
February 19 2016
Nonideal detonation regimes in low density explosives
A. P. Ershov;
A. P. Ershov
a)
Lavrentyev Institute of Hydrodynamics
, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia
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A. O. Kashkarov;
A. O. Kashkarov
Lavrentyev Institute of Hydrodynamics
, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia
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E. R. Pruuel;
E. R. Pruuel
Lavrentyev Institute of Hydrodynamics
, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia
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N. P. Satonkina;
N. P. Satonkina
Lavrentyev Institute of Hydrodynamics
, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia
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V. V. Sil'vestrov;
V. V. Sil'vestrov
b)
Lavrentyev Institute of Hydrodynamics
, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia
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A. S. Yunoshev;
A. S. Yunoshev
Lavrentyev Institute of Hydrodynamics
, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia
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A. V. Plastinin
A. V. Plastinin
Lavrentyev Institute of Hydrodynamics
, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
b)
Deceased (10 April 2015).
J. Appl. Phys. 119, 075903 (2016)
Article history
Received:
December 11 2015
Accepted:
February 06 2016
Citation
A. P. Ershov, A. O. Kashkarov, E. R. Pruuel, N. P. Satonkina, V. V. Sil'vestrov, A. S. Yunoshev, A. V. Plastinin; Nonideal detonation regimes in low density explosives. J. Appl. Phys. 21 February 2016; 119 (7): 075903. https://doi.org/10.1063/1.4942359
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