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- W2040921475 abstract "Characteristic differences in the effect of density distinguish composite explosives (based on ammonium nitrate or ammonium perchlorate as oxidizer with an organic fuel) from molecular explosives like TNT or pure ammonium perchlorate. The behavior suggests that the reaction slows down when density is increased in composite explosives, while in molecular explosives it speeds up. Cook (see Ref. 8) ascribes the effect to diffusion as the rate-controlling mechanism. This paper describes a model for diffusion-controlled reaction based on the “hole” concept in liquids, in which the activation energy for diffusion is equated simply to pV. The marked effect of density, therefore, results from the strong dependence of pressure on density (p varying about as the density cubed) and the appearance of this factor in an exponential term. On this basis, the following approximate expression is derived for dependence of detonation velocity D on explosive density ρ0 D / D ∞ * = ( ρ 0 / ρ 0 * ) m [ 1 − l / d exp b ( ρ 0 / ρ 0 * ) 2 m + 1 ] where d is the charge diameter, l and b are constants related to various explosive parameters, m is the exponent of order unity in the expression for ideal velocity D∞ as a function of density and the asterisk refers to a reference state. From this expression, one derives that the critical diameter dc for these materials is an exponential function of density of the type log e ( d c / l ) = b ( ρ 0 / ρ 0 * ) 2 m + 1 Experimental evidence to support this behavior is given; and the implications of these results for the problem of determining critical diameter in composite solid propellants are discussed." @default.
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- W2040921475 date "1965-01-01" @default.
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- W2040921475 title "Detonation limits in composite explosives" @default.
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- W2040921475 doi "https://doi.org/10.1016/s0082-0784(65)80226-0" @default.
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