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Strain rate dependence of anisotropic compression behavior in porous iron with unidirectional pores

Published online by Cambridge University Press:  31 January 2011

Masakazu Tane ,
Tae Kawashima ,
Hiroyuku Yamada ,
Keitaro Horikawa ,
Hidetoshi Kobayashi  and
Hideo Nakajima
Tae Kawashima
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
Hidetoshi Kobayashi
Affiliation:
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
Hideo Nakajima
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
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Abstract

The strain rate dependence of anisotropic compression behavior in porous iron with cylindrical pores oriented in one direction was investigated. Through high strain rate (˜103 s−1) compression tests along the orientation direction of pores using the split Hopkinson pressure bar method, it was shown that the stress–strain curve exhibits a unique plateau-stress region where deformation proceeds with almost no stress increase. The appearance of the plateau-stress region is related to the buckling deformation of the iron matrix and provides superior energy absorption. However, for the middle (˜10−1 s−1) and low strain rates (˜10−4 s−1), compression along the same direction produces no such plateau region. In fact, in contrast to compression in the parallel direction, compression perpendicular to the orientation direction of pores produces no plateau-stress regions in any of the three strain rates.

Keywords

FoamFeStress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 6 , June 2010 , pp. 1179 - 1190
Copyright
Copyright © Materials Research Society 2010

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