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Pressure-sensitive dissipation in elastomers and its implications for the detonation of plastic explosives

Knauss, Wolfgang G. and Sundaram, Sairam (2004) Pressure-sensitive dissipation in elastomers and its implications for the detonation of plastic explosives. Journal of Applied Physics, 96 (12). pp. 7254-7266. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:KNAjap04

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Abstract

The role of binder deformation and the associated energy dissipation on the detonation sensitivity of plastically bonded explosives is considered by accounting for dilatation-sensitive viscoelastic shear response. Following the observation that pressurization can prolong the relaxation and retardation times of a viscoelastic elastomer tremendously, the implications of this phenomenon are considered for a thin layer of a model elastomer, sheared between two blocks of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine under deformation rates typical in detonation scenarios. The consequences of concurrent pressurization on heat generation are examined using small deformation as well as finite deformation analyses. While a dilatation-insensitive viscoelastic behavior generates notable temperature increases, they are insufficient to cause ignition of the explosive. However, taking into account the increased dissipation associated with the pressure-induced changes in the intrinsic time scale and viscosity of the elastomer leads to temperature rises on the order of 1000degreesC, which are consistent with "hot spots" held responsible for the initiation of detonation in the adjacent explosive grains.


Item Type:Article
Additional Information:Copyright © 2004 American Institute of Physics. Received 11 June 2004; accepted 21 September 2004. The authors would like to acknowledge the support of the U.S. Department of Energy through the ASCI-ASAP “Center for the Dynamic Response of Materials” Contract No. B341492 under DOE Contract No. W-7407-ENG-48 at the California Institute of Technology. The authors would also like to thank Professor J. E. Shepherd at Caltech for repeated helpful discussions during this work, to D. Nelson and J. Campbell for preparing the final draft, and to S. Browne for help in preparing print-worthy figures.
Subject Keywords:elastomers; detonation; explosions; shear modulus; shear deformation; viscoelasticity; thermal stresses; elastic constants; heat conduction; high-pressure effects
Record Number:CaltechAUTHORS:KNAjap04
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:KNAjap04
Alternative URL:http://dx.doi.org/10.1063/1.1818349
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3734
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Jun 2006
Last Modified:26 Dec 2012 08:56

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