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- W2185538963 abstract "The existing models of the reaction center formation caused by the compression of high explosives (HE) in shock waves, for example, Mader's mechanism of hot spots, do not allow any explanation of the relatively high sensitivity of solid HE containing 0.1-10-y voids to the shock waves with amplitudes of the order of 1 GPa. In the present paper, the dynamics of void collapse is analyzed. It is shown that the latter occurs in solid HE in a substantially viscous regime, and almost all energy to be evolved in the course of collapse is converted by viscous and plastic forces into heat in the vicinity of a void. Unlike Mader's mechanism (which is typical for large pores with sizes ^ 1-10 mm), the temperature rise near a collapsing void in this case is not accompanied by a local pressure increase in the hot spot. Thus the lifetime11 of a hot spot is controlled by thermal conductivity of HE rather than by diverging hydrodynamic waves (as in the case of Mader's mechanisms), and is long enough to provide the conditions for the initiation of a reaction even if the voids are as small as 1 u. The values of a pore surface temperature rise, ignition delays, and critical pressures required to generate reaction centers behind a shock are estimated. The calculated critical pressures agree by an order of magnitude with the available experimental ones. The calculations demonstrate a high effectiveness of the considered mechanism Presented at the 8th ICOGER, Minsk, USSR, Aug. 23-26, 1981." @default.
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- W2185538963 date "1983-01-01" @default.
- W2185538963 modified "2023-10-17" @default.
- W2185538963 title "Shock Wave Predetonation Processes in Porous High Explosives" @default.
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- W2185538963 doi "https://doi.org/10.2514/5.9781600865602.0492.0504" @default.
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