Dynamic Mechanical Behavior and Fracture Failure Mechanism of HMX Single Crystal

doi:10.12382/bgxb.2024.0534

Abstract

Abstract:

The dynamic uniaxial compression experiments of energetic HMX single crystals are made to study the fracture mechanics behavior of energetic single crystals. Large single crystals with unilateral size greater than 3mm are cultivated using acetone solvent, and a polishing machine is used to grind the irregular single crystals into cylindrical shapes with a size of ϕ5.3mm×2mm. The sample is loaded at a rate of 2000s^-1, and the high-speed photography is used to obtain the mechanical response images during loading. It is found that HMX is brittle fracture under high strain rate loading, and the maximum stress is reached at 10μs. There are a lot of cleavage fractures after the fragmentation of single crystal particles. The fragmentsare mainly concentrated in small particles with particle size of 10-1000μm. The broken explosives are no longer continuous at a microscopic level, and the contact surfaces between the fragments are prone to forming hotspots during further loading.

Key words: HMX, fracture, high-speed photography, split Hopkinson pressure bar

CLC Number:

TJ55

GUO Hongfu, ZHENG Xiongwei, MA Tian, DOU Yongpeng, PENG Jun. Dynamic Mechanical Behavior and Fracture Failure Mechanism of HMX Single Crystal[J]. Acta Armamentarii, 2024, 45(S1): 296-301.

Figures/Tables 7

Fig.1 HMX single crystal growing method and crystal structure

Fig.2 Schematic diagram of SHPB

Fig.3 Schematic diagram of specimen

Fig.4 Stress-strain curve of single crystal HMX101 surface

Fig.5 The deformation and failure development and stress-time curve of single crystal HMX

Fig.6 Electronic scanning image of HMX fragments

Fig.7 Distribution curve of HMX fragments

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