Modelling of Thermal Ignition of Energetic Materials.

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Authors
  1. Underhill, P.R.
  2. Bardon, M.F.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN);Royal Military Coll of Canada, Kingston ONT (CAN) Dept of Mechanical Engineering
Abstract
In order to accurately model the thermal ignition of energetic materials, there are three necessary components, a computer program capable of reproducing the relevant chemical and physical processes, an experimentally verified model of the chemical kinetics, and a method of obtaining accurate parameters for input into the program. All three of these issues have been addressed in this report. In particular, the currently available Finite Element codes have been reviewed for their suitability and one, TOPAZ2D was selected. This code was modified to include non-integral reaction orders and also to deal with phase changes that can occur in temperature ranges where chemical processes are active. The key processes leading to the ignition of ammonium perchlorate-based propellants and PBXs based on RDX have been explored both theoretically and experimentally. This has led to the clear indication that sublimation plays an important role in both of these systems. In the case of RDX, a quantitative model has been proposed which accurately reproduces the cook-off data of Farinaccio. Finally, a new method of obtaining the thermal conductivity for energetic material over a wide temperature range was developed. Because this method only uses very small quantities of material, it can be used at temperatures close to the autoignition point.
Keywords
TOPAZ2D
Report Number
DRDC-VALCARTIER-CR-2003-054 — Contractor Report
Date of publication
01 Jun 2002
Number of Pages
200
DSTKIM No
CA022303
CANDIS No
519167
Format(s):
Hardcopy

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