Study on Lee-Tarver Model Parameters of CL-20 Explosive Ink

Abstract

With the development of MEMS (Micro-electromechanical System), higher requirements have been put forward for the micro-charge of booster explosive. Direct write technology can directly write the explosive ink into the hole or groove. Compared with traditional charge, the explosive ink has small size, low forming density, and obvious non-ideal detonation characteristics. It is impossible to calibrate the parameters of JWL EOS (Equation of State) and reaction rate equation by cylinder test and Laplace analysis. In order to determine the Lee-Tarver model parameters of CL-20 explosive ink with forming the density of 1.45 g/cm3 (93% CL-20, 3% GAP, 2% NC), we write CL-20 explosive ink to groove with different sizes and measure the detonation velocities. The detonation parameters and JWL EOS parameters of CL-20 explosive ink are calculated by Explo-5 software. Simulation models are established with AUTODYN software according to the detonation velocity test. Combining with finite element simulation and test results, Lee-Tarver model parameters of CL-20 explosive ink are fitted. According to the determined Lee-Tarver model parameters of CL-20 explosive ink, a simulation model of critical size test is established. The calculation results show that the critical size of CL-20 explosive ink in this study ranges from 0.1 to 0.2 mm.