SciTech Connect

Title: A thermochemical model for shock-induced chemical reactions in porous solids: Analogs and contrasts to detonation

A thermochemical model for shock-induced chemical reactions in porous solids: Analogs and contrasts to detonation There is a class of non-explosive energetic materials (''ballotechnics''), that undergo rapid shock-induced chemical reactions, but whose products contain no vapor that can cause a rapid expansion upon pressure release. The present paper presents a thermochemical model describing such reactions in terms analogous to detonation. By contrast, however, the chemical energy in ballotechnics is converted mostly to heat rather than work by the shock wave, and an unsupported reaction wave will decay. In the absence of volatiles, there are no large increases in pressure, specific volume, or particle velocity associated with ballotechnic reactions. Thus, experimental methods normally applied to high explosives are insensitive, and time-resolved temperature measurements are the most appropriate. The pressure-volume-velocity relationships are strongly dependent on small amounts of volatiles (such as water) when present, but the shock temperature is not. Thermochemically, the possibility of a true detonation in a volatile-bearing ballotechnic powder cannot be precluded. By the same arguments, geochemical detonations in volatile-saturated, supercooled magmas are possible. 28 refs., 8 figs., 3 tabs.
Authors:
Publication Date:
OSTI Identifier:5978092
Report Number(s):SAND-88-2448C; CONF-890811-26
ON: DE89016180
DOE Contract Number:AC04-76DP00789
Resource Type:Conference
Data Type:
Resource Relation:Conference: 9. international symposium on detonation, Portland, OR, USA, 28 Aug - 1 Sep 1989; Other Information: Portions of this document are illegible in microfiche products
Research Org:Sandia National Labs., Albuquerque, NM (USA)
Country of Publication:United States
Language:English
Subject: 36 MATERIALS SCIENCE; CHEMICAL REACTIONS; MATHEMATICAL MODELS; ALUMINIUM OXIDES; CHEMICAL REACTION KINETICS; DETONATIONS; EFFICIENCY; EQUATIONS OF STATE; HEATING; IRON OXIDES; MIXING; NICKEL; POROUS MATERIALS; PRESSURE EFFECTS; SHOCK WAVES; TEMPERATURE MEASUREMENT; ALUMINIUM COMPOUNDS; CHALCOGENIDES; ELEMENTS; EQUATIONS; IRON COMPOUNDS; KINETICS; MATERIALS; METALS; OXIDES; OXYGEN COMPOUNDS; REACTION KINETICS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS 360603* -- Materials-- Properties