Study of Metal Fracture Characteristics Under Blast Loading Conditions of 3,4‐Dinitrofurazanfuroxan‐based Explosive

ABSTRACT 3,4‐Dinitrofurazanfuroxan (DNTF) is a high‐energy‐density substance now garnering significant interest, and it has the potential to substitute trinitrotoluene as a fused explosive carrier for the development of a composite explosive with enhanced driving capabilities. The ideal alignment between the mechanical characteristics of the fragmentation material and the detonation properties of the explosive is a fundamental concern in the design of fragmentation warheads. To assess the dynamic mechanical response and fracture properties of frequently utilized materials (90W7Ni3Fe, 93W4Ni3Fe, 20 steel, and 45 steel) under high Gurney energy from a DNTF‐based explosive (comprising DNTF, high melting explosive, aluminum powder, and paraffin wax in mass fractions of 30%, 66%, 2.5%, and 1.5%, respectively), cylinder tests were conducted to evaluate the compatibility between these materials and the DNTF‐based explosive. The findings indicate that metal plasticity significantly influences the magnitude of its velocity under DNTF‐based explosive loading circumstances. Steel (20 steel, 45 steel) exhibits superior plasticity compared to tungsten alloy (90W7Ni3Fe and 93W4Ni3Fe); 45 steel exhibits inferior plasticity compared to 20 steel, and a greater fracture strain correlates with an increased velocity attained. Under DNTF‐based explosive loading circumstances, 45 steel tubes exhibit more severe fractures and a reduced range of fragment distribution. Tungsten alloy is a brittle substance that demonstrates more fragmentation under DNTF‐based explosive blast loading than steel. In DNTF‐based explosives, choosing materials with increased plasticity enhances the attainment of elevated fracture strain, fracture strain rate, and initial fragment velocity upon breaking.