MODELLING OF THERMAL IGNITION OF RDX/HTPB BASED PBXS

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Authors
  1. Underhill, P.R.
  2. Bardon, M.F.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN);Royal Military Coll of Canada, Kingston ONT (CAN) Dept of Mechanical Engineering
Abstract
There is currently a significant interest in being able to model the behaviour of energetic material under thermal attack. The report investigates the method required to establish a reliable parameterization based on simple low cost experimental tests, using the RDX/HTPB family of PBXs as a case study. The experimental and theoretical evidence for the mechanism of RDX decomposition below the RDX melting point is investigated and it is concluded that sublimation of RDX plays a key role in the decomposition of PBXs. The activation energy for sublimation is obtained from TGA meausrements and several computational models employing it are developed. All of these models are capable of reproducing the experimentally measured time to explosion. However, it is demonstrated that these models produce different explosive behaviour in large diameter munitions. It is suggested that coating techniques may be able to reduce the vulnerability of RDX based PBxs by eliminating the sublimation process.
Keywords
Thermal ignition;HTPB;Insensitive munitions
Report Number
DREV-CR-914;RMC/DME-960601 — Mechanical Engineering Report; Interim Report
Date of publication
01 Jun 1996
Number of Pages
57
DSTKIM No
97-00621
CANDIS No
500740
Format(s):
Hardcopy;Document Image stored on Optical Disk

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