TATB造型粉颗粒单轴压缩力学性能  

Mechanical Property of the Single TATB Granule by Uniaxial Compression

作　　者：马寅翔 刘晨[1] 王慧[1] 张才鑫 陈华[1] 张伟斌[1] MA Yin-xiang;LIU Chen;WANG Hui;ZHANG Cai-xin;CHEN Hua;ZHANG Wei-bin(Institute of Chemical Materials,CAEP,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院化工材料研究所,四川绵阳621999

出　　处：《含能材料》2020年第10期960-968,共9页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金资助(11572294、11702262)。

摘　　要：为掌握三氨基三硝基苯(TATB)造型粉颗粒力学性能,设计了一种适用于X射线微层析成像系统的原位微米力学加载装置,利用X射线微层析成像技术对颗粒细观结构特征进行了无损表征,采用Hertz法向接触模型对单个造型粉颗粒力-位移关系进行了研究,获得了单个TATB造型粉颗粒的杨氏模量、屈服点、接触刚度、破坏荷载等力学参数与颗粒外形、孔隙形态、孔隙分布等结构特征。结果表明,单个TATB造型粉颗粒准静态法向压缩过程表现出弹性变形、弹-塑性变形与破坏崩塌三个阶段,颗粒内部尺寸小且空间结构分散的孔隙在颗粒变形过程中基本不发生变化,颗粒内部尺寸大且平行于加载方向的片状孔隙显著降低颗粒破坏强度,颗粒内部结构的差异对其压缩力学性能影响较大。In order to obtain the mechanical properties of the 1,3,5-triamino-2,4,6-trinitrobenzene(TATB)granules,an in-situ micron-level mechanical loading device suitable for X-ray Micro-Computed Tomography system was designed.By using the X-ray Micro-Computed Tomography technique,the structural characteristics were non-destructively characterized.Hertz contact model was used to study the force-displacement relationship of the individual granule.Mechanical properties of granule such as Young's modulus,yield point,contact stiffness,breakage force,and structural characteristics of granule such as particle shape,pore shape,pore distribution were determined.The results show that the quasi-static normal compression process of a single TATB granule has three stages:elastic deformation,elastic-plastic deformation,and collapse.The pores with small size and dispersed spatial structure in the granule do not change during the particle deformation process,and the large sheet-like pores inside granule paralleled to the loading direction significantly reduce the breakage strength of the particles.The difference in the internal structure of the particles has large influence on their compression mechanical properties significantly.

关 键 词：三氨基三硝基苯(TATB) 造型粉颗粒 CT原位试验 单轴压缩 力学性能 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] TP391[自动化与计算机技术—计算机应用技术]