Shear-induced exothermic chemical reactions

被引：7

作者：

Chen, HC ^{[1
]}

Nesterenko, VF ^{[1
]}

LaSalvia, JC ^{[1
]}

Meyers, MA ^{[1
]}

机构：

[1] USA,RES LAB,ABERDEEN PROVING GROUND,MD 21005

来源：

JOURNAL DE PHYSIQUE IV | 1997年 / 7卷 / C3期

关键词：

D O I：

10.1051/jp4:1997307

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The structure of controlled high-strain-rate shear bands generated in Ti-Si reactive powders has been investigated by means of the radial symmetric collapse of a thick-walled cylinder. Shear localization developed at global strains of 0.2-0.4 and a strain rate of 10(4) s(-1). Within the shear bands, local shear strains were up to 100 and local shear strain rates were 10(7) s(-1). Chemical reactions were initiated at these shear bands and propagated throughout the entire specimen under critical global strain conditions. A model for a periodic distribution of ''hot spots'' in reactive powders is proposed. It is possible to estimate the reaction rate from the triangular unreacted regions formed by the shear localization process.

引用

页码：27 / 32

页数：6

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