Wang Jing-yu

GAP/CL-20-Based Compound Explosive: A New Booster Formulation Used in a Small-Sized Initiation Network

ABSTRACT With ε-2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20) and glycidyl azide polymer (GAP) as the solid filler and binder, respectively, GAP/CL-20-based compound explosives were designed and prepared. Using micro injection charge technology, the compound explosives were packed into small grooves to explore their application in a small-sized initiation network. The detonation reliability, detonation velocity, mechanical sensitivity, shock sensitivity, and brisance of the explosive were measured and analyzed. The results show that when the solid content of CL-20 is 82 wt%, the explosive charged in the groove has a smooth surface from a macroscopic view. From a microscopic view, a coarse surface is bonded with many CL-20 particles by GAP binder. The GAP/CL-20-based explosive charge successfully generates detonation waves in a groove larger than 0.6 mm × 0.6 mm. When the charge density in the groove is 1.68 g·cm−3 (90% theoretical maximum density), the detonation velocity reaches 7,290 m·s−1. Moreover, this kind of explosive is characterized by low impact and shock sensitivity.

Simulation and analysis on the drag acceleration characteristic of rigid projectiles into ductile metallic plates

The impact of projectiles perforating plastic metallic plates was studied in order to obtain deceleration characteristic of projectiles in the process. Based on cylindrical cavity-expansion theory, several new Formulas of perforation drag acceleration and dissipative energy with take into account three interconnected perforation stages were presented. Perforation experiments that have been performed by SIMLAB Norway on aluminium plates with four thicknesses were simulated using the non-linear finite element code LS-DYNA. Calculations with new model were also carried out. Analytical and numerical results were compared to the experimental findings, and good agreement was in general obtained. Deceleration characteristics in different perforation stages of projectiles were analyzed. Theoretic reference and analytical method were provided for deceleration characteristic evaluation of sharp-nose projectiles and small mass charges.

Study on preparing crystalline C 3 N 4

Plasma-detonation synthesis was developed to synthesize the superhard material C 3 N 4 . The method integrates the advantages of plasma and detonation in carbon nitride preparation. In the method high-tempreture plasma was supplied through high-voltage impulsing power source, TNT was detonator and C 3 N 6 H 6 was reactant. The samples of prepared were analyzed and characterized by the ways of SEM, EDS, XRD and FTIR. The results show that average crystalline size is 1.1μm, and most particle is hexagon. The quality ratio of carbon to nitrogen is about 1.00 : 1.77 and the products are mainly α-C 3 N 4 and β-C 3 N 4 , g-C 3 N 4 and a few of CNx phase. The main valence bonds are C-N and C=N.