Al/Ni类含能结构材料冲击压缩特性细观模拟  

Mesoscale Modeling on Dynamic Behavior of Al/Ni Energetic Structural Materials Under Shock Compression

作　　者：熊玮[1] 张先锋[1] 陈海华 杜宁 包阔 谈梦婷 XIONG Wei;ZHANG Xian-feng;CHEN Hai-hua;DU Ning;BAO Kuo;TAN Meng-ting(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《含能材料》2020年第10期984-994,共11页Chinese Journal of Energetic Materials

基　　金：中国空气动力研究与发展中心超高速碰撞研究中心开放基金(20200106);国家自然科学基金项目(11772159);中央高校基本科研业务费专项资金(30920021108)。

摘　　要：为了研究含能结构材料冲击响应特性,开展了以Al/Ni为代表的含能结构材料冲击压缩细观模拟研究。结合扫描电子显微镜照片分析了三种典型Al/Ni类含能结构材料的细观结构特性,研究了材料配比、制备工艺对材料细观结构的影响规律。从细观结构照片和细观颗粒初始形态入手,分别建立了Al/Ni类含能结构材料冲击压缩细观模型,计算并比较了该类材料在冲击压缩过程中的颗粒变形、压力响应、冲击温度分布及冲击波传播特性。结果表明:Al/Ni粉末复合材料的细观颗粒主要以Ni为基体,且Al颗粒随着其含量的上升而发生团聚;而Al/Ni多层复合材料主要以Al为基体,Ni近似于平行分布其中。Al/Ni类含能结构材料细观结构存在不均匀特性,导致其在冲击压缩过程中产生局部高压和热点,而这一特性无法由基于材料初始颗粒形态建立的均匀化细观模型得到。The dynamic behavior of Al/Ni energetic structural materials under shock compression loading was investigated by mesoscale simulation.The influence of material composition and manufacturing technique on microstructures were analyzed against the scanning electron micrographs(SEMs)of three typical Al/Ni materials.Two types of mesoscale models were established based on the SEMs and the uniform particle morphologies of Al/Ni material,respectively.The shock responses of Al/Ni material,including particle deformation,pressure,temperature,and propagation of shock waves,were analyzed.The results show that,as for Al/Ni powder composites,Ni particles are the main components of the matrix,and the embedded Al particles gradually reunite with its volume fraction increasing.In contrast,Al layers are the main components of the matrix of Al/Ni multi-layered composites,and Ni particles parallelly distributed in the material.The mesoscale model with the uniform particles could not be used to predict the formations of local high pressure and hot spots,since that such processes are related to the heterogeneous microstructure of Al/Ni materials.

关 键 词：含能结构材料 冲击压缩 局部热点 细观模拟 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O382[理学—流体力学]