Research on Driving Characteristic for Dual Charge of DNTF-Based Aluminized Explosive

Abstract

By choosing two types of DNTF-based explosives with aluminum content of 5% and 20%, two kinds of the test samples with typical inner/outer dual charge structures were prepared. Detonation velocity and expansion process of the cylinder wall were measured by 50mm cylinder test. Energy release characteristics of different dual charge structures were analyzed and compared with that of single explosive charge. The results show that when inner layer of dual charge is high detonation velocity explosive, its detonation velocity is about the average of two kinds of single explosive charge, and the driving ability is enhanced significantly at the latter stage of expansion, so that it's Gurney coefficient is only 2.86mm/μs; when outer layer of dual charge is high detonation velocity explosive, its detonation velocity is slightly lower than single charge with high detonation velocity, and the detonation wave has obvious cohesion characteristics, so energy release rate of the inner layer is improved and the driving ability is enhanced sostenuto, which Gurney coefficient upgrade to 2.93 mm/μs.