Relating a small-scale shock sensitivity experiment to large-scale failure diameter in an aluminized ammonium nitrate non-ideal explosive
| Autor: | Nicholas R. Cummock, Steven F. Son, Jesus O. Mares, Ibrahim E. Gunduz |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Shock wave Materials science Explosive material Astrophysics::High Energy Astrophysical Phenomena General Chemical Engineering Ammonium nitrate Detonation General Physics and Astronomy Energy Engineering and Power Technology 02 engineering and technology General Chemistry Mechanics 021001 nanoscience & nanotechnology 01 natural sciences Sensitivity (explosives) Shock (mechanics) Shock sensitivity chemistry.chemical_compound Fuel Technology chemistry 0103 physical sciences Particle size 0210 nano-technology |
| Zdroj: | Combustion and Flame. 194:271-277 |
| ISSN: | 0010-2180 |
| Popis: | The detonation failure process, specifically where a transient reaction occurs in an overdriven explosive due to a sub-critical charge diameter, has remained relatively unexplored, particularly regarding its relationship to shock initiation mechanisms. Detonation failure, here defined as a weakly supported shock wave traveling with a decaying velocity, of aluminized ammonium nitrate (AN/Al) was considered to investigate the relationship between the detonation failure process and shock sensitivity. Previous work has shown that the Al additive particle size alters the failure diameter, a measure of shock sensitivity, of AN/Al. Microwave interferometry was used to measure the transient shock wave velocity in the explosive system, which was lightly confined at a diameter below its critical diameter, in response to an overdriven shock insult in a small-scale experiment. An array of mixture ratios and particle size distributions of the explosive system was used to vary the sensitivity of the explosive and to facilitate exploration of the relationship between the shock velocity decay rate, initiation mechanisms, and large-scale shock sensitivity. Resulting shock velocity profiles in AN/Al indicate that micron-sized and larger Al particles can contribute to the detonation process. It is concluded that the rate at which the transient shock velocity approaches that of a compressive wave with no supporting reaction corresponds to the relative shock sensitivity of the system; it is therefore proposed that the measured shock velocity decay rate of an overdriven sub-critical diameter charge of AN/Al reveals quantifiable information about the relative shock sensitivity of a large-scale charge. |
| Databáze: | OpenAIRE |
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