WIT Press


Theory And Calibration Of JWL And JWLB Thermodynamic Equations Of State

Price

Free (open access)

Paper DOI

10.2495/SU100131

Volume

113

Pages

7

Page Range

147 - 158

Published

2010

Size

537 kb

Author(s)

E. L. Baker, D. Murphy, L. I. Stiel & E. Wrobel

Abstract

Structure geometric configuration and response can be strongly coupled to blast loading particularly for close-in blast loading configurations. As a result, high rate continuum modeling is being increasingly applied to directly resolve both the blast profiles and structural response. In this modeling, the equation of state for the detonation products is the primary modeling description of the work output from the explosive that causes the subsequent air blast. The Jones- Wilkins-Lee (JWL) equation of state for detonation products is probably the currently most used equation of state for detonation and blast modeling. The Jones-Wilkins-Lee-Baker (JWLB) equation of state is an extension of the JWL equation of state that we commonly use. This paper provides a thermodynamic and mathematical background of the JWL and JWLB equations of state, as well as parameterization methodology. Two methods of parameter calibration have been used to date: empirical calibration to cylinder test data and formal optimization using JAGUAR thermo-chemical predictions. An analytic cylinder test model that uses JWL or JWLB equations of state has been developed, which provides excellent agreement with high rate continuum modeling. This analytic cylinder model is used either as part of the formal optimization or for post parameterization comparison to cylinder test data. Keywords: blast, explosives, equation of state, modelling. 1 Introduction Structure geometric configuration and response can be strongly coupled to blast loading particularly for close-in blast loading configurations. As a result, high

Keywords

blast, explosives, equation of state, modelling