Upgraded Analytical Model of the Cylinder Test

• Published in: Propellants, explosives, pyrotechnics Vol. 38; no. 3
• Main Authors: Souers, P. Clark, Lauderbach, Lisa, Garza, Raul, Ferranti, Louis, Vitello, Peter
• Format: Journal Article
• Language: English
• Published: United States Wiley 15-03-2013
• Subjects: Cyclex; Cylinder test; Detonation energy; Gurney equation; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; JWL
• ISSN: 0721-3115; 1521-4087

A Gurney-type equation was previously corrected for wall thinning and angle of tilt, and now we have added shock wave attenuation in the copper wall and air gap energy loss. Extensive calculations were undertaken to calibrate the two new energy loss mechanisms across all explosives. The corrected Gurney equation is recommended for cylinder use over the original 1943 form. The effect of these corrections is to add more energy to the adiabat values from a relative volume of 2 to 7, with low energy explosives having the largest correction. The data was pushed up to a relative volume of about 15 and the JWL parameter ω was obtained directly. Finally, the total detonation energy density was locked to the v = 7 adiabat energy density, so that the Cylinder test gives all necessary values needed to make a JWL.