Effect of aging on damage properties and reaction characteristics of typical 2,4‐dinitroanisole (DNAN)‐based melt‐cast explosives under low‐velocity impact

Abstract

The effects of aging degradation on the safety performance of typical 2,4‐dinitroanisole (DNAN)‐based melt‐cast explosives (MCEs) were studied. An in‐house‐designed low‐velocity impact device and a closed bomb were used to study the effects of aging on the fragmentation and reactivity of DNAN‐based MCEs under impact damage. The test results showed that after artificially accelerated aging of the bare grain, the mass decreased, volume increased, and compressive strength increased, resulting in physical defects such as cracks and debonding occurring inside the explosive. The degree of damage to the DNAN‐based melt‐cast explosive increased with an increase in the impact velocity. Artificial aging increases the degree of damage and impact sensitivity of explosives. The relationship between the degree of fragmentation and the impact velocity under different aging times was revealed through the frangibility factor (FFE) and dynamic activity (L). The microcracks formed by DNAN sublimation and aging significantly affected the sample reaction violence.