Investigation on reaction energy, mechanical behavior and impact insensitivity of W-PTFE-Al composites with different W percentage

被引：89

作者：

Wang, Liu ^{[1
]}

Liu, Jinxu ^{[1
]}

Li, Shukui ^{[1
,2
]}

Zhang, Xinbo ^{[1
]}

机构：

[1] Beijing Inst Technol, Sch Mat Sci & Engn, 5 Yard,Zhong Guan Cun South St, Beijing 100081, Peoples R China

[2] Beijing Inst Technol, State Key Lab Explos Sci & Technol, 5 Yard,Zhong Guan Cun South St, Beijing 100081, Peoples R China

来源：

MATERIALS & DESIGN | 2016年 / 92卷

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

W-PTFE-Al composites; Reaction energy; Mechanical characterization; Insensitivity; Fracture;

D O I：

10.1016/j.matdes.2015.12.045

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Reaction energy, mechanical behavior, and impact initiation of three kinds of tungsten (W)-polytetrafluoroethylene (PTFE)-aluminum (Al) composites are investigated. The reaction energy results show that, the reaction energy of W-PTFE-Al composites in both oxygen and argon decreases with the mass ratio of W increased from 50% to 80%. Quasi-static compression results show that, the increased mass ratio of W has no obvious influence on the strength of W-PTFE-Al composites. However, the critical failure strain presents obviously decreasing tendency with the increased mass ratio of W. Dynamic compression results show that, the strength enhances with the increased W in W-PTFE-Al. The critical failure strain shows no obvious difference when the W content of W-PTFE-Al increases. Under impact condition, the deflagration time of all the three kinds of W-PTFE-Al composites lasts for about 500 ps. The insensitivity to impact loading shows an increasing tendency with the increased W mass ratio. During impact compressive deformation, the PTFE matrix is elongated in nano-fibers, thus significantly increases the reaction activity of W-PTI-E-Al composites. The nano-fiber structure is necessary for the reaction of W-PTFE-Al composites. The formation of PTFE nano-fibers must undergo severe plastic deformation, which is responsible for the excellent insensitivity of W-PTFE-Al composites. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：397 / 404

页数：8

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