Fracture behavior of PBX simulation subject to combined thermal and mechanical loads
Fracture behavior of PBX simulation subject to combined thermal and mechanical loads
复制标题
PBX 模拟在热和机械载荷组合作用下的断裂行为
DOI：
10.1016/j.polymertesting.2009.05.011
复制
发表时间：
2009-09-01
期刊：
影响因子：
5.1
通讯作者：
Huang, F. L.
中科院分区：
文献类型：
--
作者：
Liu, Z. W.;Xie, H. M.;Huang, F. L.
采用数字图像相关（DIC）方法研究了高聚物粘结炸药（PBX）模拟材料的断裂行为和力学性能。分析了材料在热载荷和机械载荷联合作用下的断裂机理。宏观断裂模式由剪切为主转变为拉伸和剪切相结合，微观断裂模式由解理断裂和穿晶断裂转变为界面脱粘、填料颗粒断裂和穿晶与沿晶断裂相结合。蠕变性能的微观分析表明，初始损伤的随机性以及蠕变、损伤和邻近损伤的相互作用是导致局部蠕变应变重复增加的主要原因。在高温蠕变过程中，首先形成大范围的裂纹，然后是剪切裂纹的萌生和扩展，最终连接并导致材料内部的宏观断裂。已发现主要的微观断裂模式是沿晶开裂和粘结剂撕裂失效。(C)2009爱思唯尔有限公司保留所有权利。
The fracture behavior and mechanical properties of a Polymer Bonded Explosives (PBX) simulation material were studied using the Digital Image Correlation (DIC) method. The fracture mechanism was analyzed as the material was subjected to combined thermal and mechanical loads. The macroscopic fracture mode changed from mainly shear action to a combination of extension and shear action, whereas the microscopic fracture changed from cleavage fracture and transcrystalline rupture to interfacial debonding, breaking of filler particles and a combination of transcrystalline and intercrystalline rupture. Microanalysis of the creep properties showed the random nature of initial damage and the interaction between creep, damage and nearby damage, were the main reasons for the local creep strain repetition increase. During the process of high temperature creep, extensive cracks are first formed followed by the initiation and extension of shear cracks, eventually joining and causing a macroscopic fracture within the material. The main microscopic fracture mode has been found to be intercrystalline cracking and binder tearing failure. (C) 2009 Elsevier Ltd. All rights reserved.