HMX单晶的动态力学行为及断裂失效机理

doi:10.12382/bgxb.2024.0534

摘要/Abstract

摘要：

为研究含能单晶的断裂力学行为,对含能HMX单晶进行动态单轴压缩实验。采用丙酮溶剂培养出单边尺寸大于3mm的大单晶,采用抛光机将不规则的单晶研磨成可用于分离式Hopkinson动态压杆实验的尺寸为ϕ5.3mm×2mm的圆柱体。以2000s^-1速率对样品进行加载并配合高速摄影获取其加载过程中的力学响应图像。实验结果表明:在高应变率加载条件下HMX呈脆性断裂状态,样品在10μs时应力达到最大值;单晶颗粒碎裂后存在大量的解理断口,碎片主要集中于粒径10~1000μm的小颗粒;破碎后的炸药,细观上不再连续,在进一步的加载过程中,碎片之间的接触面容易形成热点。

关键词: HMX, 断裂, 高速摄影, 分离式Hopkinson动态压杆

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

中图分类号:

TJ55

郭洪福, 郑雄伟, 马田, 豆永鹏, 彭军. HMX单晶的动态力学行为及断裂失效机理[J]. 兵工学报, 2024, 45(S1): 296-301.

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.

图/表 7

图1 HMX单晶结晶方法及晶体结构

Fig.1 HMX single crystal growing method and crystal structure

图2 SHPB装置示意图

Fig.2 Schematic diagram of SHPB

图3 试样示意图

Fig.3 Schematic diagram of specimen

图4 HMX101面的应力-应变曲线

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

图5 HMX单晶的变形破坏过程和应力-时间曲线

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

图6 HMX碎片的电子扫描图像

Fig.6 Electronic scanning image of HMX fragments

图7 HMX碎片分布

Fig.7 Distribution curve of HMX fragments

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