Fracture behavior of PBX simulation subject to combined thermal and mechanical loads

被引：81
|
作者：
Liu, Z. W. [1 ]
Xie, H. M. [2 ]
Li, K. X. [1 ]
Chen, P. W. [3 ]
Huang, F. L. [3 ]
机构：
[1] Beijing Inst Technol, Sch Astronaut, Dept Mech, Beijing 100081, Peoples R China
[2] Tsinghua Univ, Dept Eng Mech, FML, Beijing 100084, Peoples R China
[3] Beijing Inst Technol, Natl Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China
来源：
POLYMER TESTING | 2009年 / 28卷 / 06期
基金：
中国国家自然科学基金;
关键词：
PBXs; Particulate composite; Fracture behavior; Creep strain; CREEP; EXPLOSIVES;
D O I：
10.1016/j.polymertesting.2009.05.011
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：627 / 635
页数：9
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