Application of the CPEX Non-Ideal Explosive Model to PBXW-115
Abstract
We present a detailed description of the use of the ICI non-ideal detonation code CPEX to model the performance of the composite underwater explosive PBXW-115 (20% RDX, 43% AP, 25% Al and 12% HTPB). We use both the ICI chemical equilibrium code IDEX and Mader's BKW code to first estimate the Chapman-Jouguet parameters for PBXW-115. Two different reaction rate models are assumed for the decomposition of the explosive components and the time constants for each are found by fitting to experimental US data on the variation of detonation velocity with charge diameter. The data is best fitted by a three term reaction rate model which equates hotspot content to some fraction of RDX content, the intermediate scale reaction primarily to the AP decomposition, and the slowest process to the Al reaction. After adjusting some of the reaction time constants because of differences between the US and Australian compositions the model then accurately reproduces the variation of detonation velocity with charge diameter found for Australian PBXW-115.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1991
- Accession Number
- ADA246357
Entities
People
- D. A. Jones
- D. L. Kennedy
Organizations
- Defence Science and Technology Group