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An Improved Simple Method of Deducing JWL Parameters from cylinder expansion test
Author(s) -
Lan IFeng,
Hung ShengChih,
Chen ChunYu,
Niu YihMing,
Shiuan JonqHwa
Publication year - 1993
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.19930180104
Subject(s) - detonation , explosive material , cylinder , mechanics , nitromethane , nonlinear system , curve fitting , function (biology) , coordinate system , mathematical analysis , mathematics , thermodynamics , physics , geometry , chemistry , statistics , organic chemistry , quantum mechanics , evolutionary biology , biology
A simple method which is much simpler than, while retaining the same degree of accuracy, as that of a large computer hydrocode has been developed for deducing the JWL equation of state (EOS) of high explosive detonation products from the cylinder expansion test. The radial expansion history of metal tube, which is recorded by the streak camera, is expressed as an appropriate fitting function with the aid of a nonlinear curve fitting procedure. The measured data with respect to Eulerian coordinate are transformed to that in Lagrangian coordinate so that the p‐V relation of detonation products may be obtained from the differentiation of fitting function and equations of conservation law. Metal strength is also taken into consideration to reduce the deviation at the lower pressure region. JWL parameters are acquired through the p‐V relations by another nonlinear curve fitting procedure. The computed results for Comp‐B, TNT, HMX, PBX‐9404 and nitromethane, which are in good agreement with Lawrence Livermore National Laboratory (LLNL) data, are listed for comparison with other procedures in literature which have been in use so far.