High strain and strain-rate behaviour of PTFE/aluminuim/tungsten mixtures

被引：0

作者：

Addiss, John ^{[1
]}

Cai, Jing ^{[2
]}

Walley, Stephen ^{[1
]}

Proud, William ^{[1
]}

Nesterenko, Vitali ^{[2
,3
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Madingley Rd, Cambridge CB3 0HE, England

[2] Univ Calif San Diego, Mat Sci & Engn Program, La Jolla, CA 92093 USA

[3] Univ Calif San Diego, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA

来源：

SHOCK COMPRESSION OF CONDENSED MATTER - 2007, PTS 1 AND 2 | 2007年 / 955卷

基金：

英国工程与自然科学研究理事会;

关键词：

drop-weight; thermite; Teflon/AL/W mixtures; force chains; porosity;

D O I：

暂无

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Conventional drop-weight techniques were modified to accommodate low-amplitude force transducer signals from low-strength, cold isostatically pressed 'heavy' composites of polytetrafluoroethylene, aluminum and tungsten (W). The failure strength, strain and the post-critical behavior of failed samples were measured for samples of different porosity and tungsten grain size. Unusual phenomenon of significantly higher strength (55 MPa) of porous composites (density 5.9 g/cm(3)) with small W particles (<1 mu m) in comparison with strength (32 MPa) of dense composites (7.1 g/cm(3)) with larger W particles (44 mu m) at the same volume content of components was observed. This is attributed to force chains created by a network of small W particles. Interrupted tests at different levels of strain revealed the mechanisms of fracture under dynamic compression.

引用

页码：773 / +

页数：2