炸药晶粒包覆结构对PBX动态损伤影响的近场动力学模拟  

Dynamic Damage Response of PBX with Different Coating Structures via Peridynamic Simulation

作　　者：黄亚飞 邓小良[1] 柏劲松[1] HUANG Ya-fei;DENG Xiao-liang;BAI Jing-song(National Key Laboratory of Shock Wave and Detonation Physics,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621999,China)

机构地区：[1]冲击波物理与爆轰物理重点实验室,中国工程物理研究院流体物理研究所,四川绵阳621999

出　　处：《含能材料》2023年第2期160-169,共10页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金资助(11872345,11802281);冲击波物理与爆轰物理重点实验室基金资助(6142A03203003,JCKYS2020212013)。

摘　　要：为了研究包覆结构对高聚物粘结炸药(PBX)动态损伤的影响,基于非局域近场动力学理论(Peridynamics,PD),结合Voronoi方法构建了含单层或双层包覆结构的高聚物粘结炸药(Polymer bonded explosive,PBX)的PD计算模型,模拟了不同加载条件下PBX的损伤响应。模拟结果显示,采用粘接剂1包覆时,相比于单层包覆而言,当加载速度分别为20,40 m·s^(-1)和60 m·s^(-1)时,双层包覆结构使HMX晶粒的损伤分别降低了42.8%,87.2%和46.8%,明显降低了PBX中HMX晶粒的损伤。HMX晶粒采用单层包覆结构时,损伤模式主要表现为穿晶损伤,采用双层包覆结构时,损伤模式转变为沿晶损伤。研究还得到了双层包覆结构下不同包覆材料对HMX损伤影响的定量结果,并据此得到了不同包覆结构的性能排序。同时发现包覆结构能够影响HMX晶粒内应力状态,从而影响HMX损伤程度。The polymer bonded explosive(PBX)model containing different coating structures is established based on the peridynamics theory and Voronoi method.The dynamic damage behaviors of PBX under different impact speeds are simulated.The simulation results indicate that double-layer coating structure can better protect HMX crystal compared to single-layer coating structure.For single-layer coating structure,the damage mode is mainly transgranular fracture.By contrast,the damage is dominated by intergranular fracture in the case of double-layer coating structure.Moreover,for double-layer coating structure,the quantitative results on damage ratio of HMX is obtained and the performance of different coating structures is ordered.By analyzing the stress state of HMX,it is found that the coating structure can greatly impact the stress distribution.This study can help better design the coating structures in PBX.

关 键 词：近场动力学理论 动态损伤 高聚物粘结炸药(PBX) 包覆结构 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术]