Strain rate effects in porous materials

被引：58

作者：

Lankford, J ^{[1
]}

Dannemann, KA ^{[1
]}

机构：

[1] SW Res Inst, San Antonio, TX 78238 USA

来源：

POROUS AND CELLULAR MATERIALS FOR STRUCTURE APPLICATIONS | 1998年 / 521卷

关键词：

D O I：

10.1557/PROC-521-103

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The behavior of metal foams under rapid loading conditions is assessed. Dynamic loading experiments were conducted in our laboratory using a split Hopkinson pressure bar apparatus and a drop weight tester; strain rates ranged from 45 s(-1) to 1200 s(-1) The implications of these experiments on open-cell, porous metals, and closed- and open-cell polymer foams are described. It is shown that there are two possible strain-rate dependent contributors to the impact resistance of cellular metals: (i) elastic-plastic resistance of the cellular metal "skeleton," and (ii) the gas pressure generated by gas flow within distorted open cells. A theoretical basis for these implications is presented.

引用

页码：103 / 108

页数：4