HMX单晶的动态力学行为及断裂失效机理  

Dynamic Mechanical Behavior and Fracture Failure Mechanism of HMX Single Crystal

作　　者：郭洪福 郑雄伟[1] 马田 豆永鹏 彭军[1] GUO Hongfu;ZHENG Xiongwei;MA Tian;DOU Yongpeng;PENG Jun(Xi'an Modern Chemistry Research Institute,Xian 710065,Shanxi,China;Military Representative Bureau of the Army Equipment Department in Xi'an,Xi'an 710065,Shaanxi,China)

机构地区：[1]西安近代化学研究所,陕西西安710065 [2]陆军装备部驻西安军事代表局,陕西西安710065

出　　处：《兵工学报》2024年第S01期296-301,共6页Acta Armamentarii

基　　金：国家自然基金青年项目(12102338)。

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?5.3 mm×2 mm的圆柱体。以2 000 s^(-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10~1 000μm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。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∅5.3 mm×2 mm.The sample is loaded at a rate of 2000 s^(-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.

关 键 词：HMX 断裂 高速摄影 分离式Hopkinson动态压杆 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术]