Mechanical properties of DNAN/HMX melt-cast explosive

Abstract

The mechanical response and damage process of melt-cast explosives under complex stress states can be affected by having a high-volume ratio of the energetic filler material to the matrix. Understanding the characteristics of the nonlinear mechanical properties of 2,4-dinitroanisole/cyclotetramethylenetetranitramine (DNAN/HMX) melt-cast explosives with a high solid-phase content can enable the analysis of the response mechanism of different strain rates. DNAN/HMX melt-cast explosives were investigated using a universal material testing machine and a split-Hopkinson pressure bar (SHPB). The stress equilibrium and constant-strain-rate loading of the low-impedance, low-strength DNAN/HMX melt-cast explosive material in the SHPB test were achieved using an incident wave shaping technique, and stress–strain curves were obtained at different strain rates (40, 51, 110, and 256 s−1). Based on the stress–strain relationship curve of DNAN/HMX melt-cast explosives, the viscoelastic parameters of the Visco-statistical cracking mechanism (SCRAM) constitutive model of DNAN/HMX melt-cast explosives are obtained by the least squares method. The results of quasi-static and dynamic loading show that the failure stress of DNAN/HMX melt-cast explosives gradually increases with the increasing strain rate, exhibiting a significant strain rate effect, while the dynamic loading displays the viscoelastic effect. The fitted Visco-SCRAM model can better predict the mechanical response of explosives under complex loading.

Exploring the thermal decomposition and detonation mechanisms of 2,4-dinitroanisole by TG-FTIR-MS and molecular simulations

“…11,12 Since the 1980s, DNAN has again aroused strong attention and has become a promising energetic material to replace the traditional trinitrotoluene (TNT) in melt-cast explosives to make them less sensitive [13][14][15][16][17][18][19] owing to its kinetic inertness and thermal stability. Various DNAN-based melt-pour explosive formulations have been developed [20][21][22][23][24][25][26][27][28][29][30][31][32] and put into service. [33][34][35] However, researchers have identied several drawbacks and challenges related to the physical properties, sensitivity, stability, compatibility, and oxygen balance of DNAN, which could potentially hinder its future applications.…”

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

“…Zhu et al [12] measured the tensile and compressive strengths of DNAN/HMX MCEs using a Brazilian disc test and a digital imaging method. Wang et al [13] elaborated the corresponding mechanism of DNAN/HMX melt-cast explosives under different strain rates using a universal material testing machine and a split Hopkinson pressure bar (SHPB). The failure stress gradually increased with the strain rate, and the dynamic loading process exhibited a viscoelastic effect.…”