Peridynamic modeling of dynamic damage of polymer bonded explosive
Peridynamic modeling of dynamic damage of polymer bonded explosive
复制标题
聚合物粘结炸药动态损伤的近场动力学建模
DOI：
10.1016/j.commatsci.2019.109405
复制
发表时间：
2020-02-15
影响因子：
3.3
通讯作者：
Wang, Bo
中科院分区：
文献类型：
--
作者：
Deng, Xiaoliang;Wang, Bo
采用新近发展起来的三维周波（PD）方法研究了1，3，5，7-四硝基-1，3，5，7-四氮杂环丁烷（HMX）基高聚物粘结炸药（PBX）的动态损伤响应。开发了内部PD程序，并通过与已发表的Kalthoff-Winkler（KW）和裂纹分支基准试验结果进行比较进行了验证。采用随机微模量法建立了PBX的数值模拟模型，该方法能够捕捉PBX材料固有的微结构不均匀性。模拟结果表明，损伤过程既取决于冲击速度，也取决于界面性质。损伤模式指数（HMX-HMX），定义为HMX-HMX损伤与粘合剂-粘合剂和HMX-粘合剂损伤之和的比值，被提出来量化跨晶和晶间损伤之间的竞争损伤机制。分析表明，界面结合强度较低，主要是晶间损伤。然而，穿晶损伤的趋势随着冲击速度的增加而增加。由于界面结合强度高，穿晶损伤模式占主导地位。但随着冲击速度的增加，颗粒间模型的趋势增加。目前的研究突出了两种典型的损伤模式的竞争机制，作为一个功能的材料性能和外部负载条件的定量方式，提供了额外的洞察PBX在冲击载荷下的损伤机制。
Dynamic damage response of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) based polymer bonded explosive (PBX) is investigated by using recently developed three dimensional Peridynamic (PD) method, allowing natural evolution of defects such as cracks or voids. An in-house PD codes are developed and verified by comparing with published results on Kalthoff-Winkler (KW) and crack branching benchmark tests. Numerical modeling of PBX is constructed via random micro-modulus approach, capable of capturing inherent microstructural heterogeneity of PBX materials. The simulation results indicate that damage process depends on both impact speed and interfacial property. Damage mode index (DMI), defined as the ratio of HMX-HMX damage to the summation of Binder-Binder and HMX-Binder damage, is proposed to quantify competitive damage mechanisms between trans- and inter-granular damage. The analyses of DMI exhibit that the inter-granular damage is dominant for the low adhesive strength of interface. However, the trend of trans-granular damage increases with increasing impact speed. The trans-granular damage mode becomes dominant for the high adhesive strength of interface. But the trend of inter-granular model increases with increasing impact speed. The current research highlight the competitive mechanisms of two typical damage modes as a function of material property and external loading conditions in a quantitative manner, providing additional insight into the damage mechanisms of PBX under impact loading.