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Tensile deformation of anisotropic porous copper with directional pores

Published online by Cambridge University Press:  31 January 2011

M. Tane ,
R. Okamoto  and
H. Nakajima
H. Nakajima
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
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Abstract

The tensile deformation of anisotropic porous copper with unidirectionally oriented cylindrical pores was investigated by an acoustic emission method. In the loadings parallel and perpendicular to the orientation direction of the pores, many cracks are formed after yielding and they strongly affect the deformation. The formed cracks rapidly grow and connect with each other near the peak stress of the stress–strain curve, thereby leading to final fracture. Crack formation is easier under perpendicular loading than under parallel loading, because high stress concentration and stress triaxiality occurs around the pores. As a result, the strength and elongation for perpendicular loading are much smaller than those for parallel loading. Furthermore, in the case of perpendicular loading, the localized deformation around pores drastically decreases the plastic Poisson's ratio. These results indicate that a porous copper macroscopically behaves as a semibrittle material under perpendicular loading, while the porous copper exhibits ductility under parallel loading.

Keywords

FoamCuStress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 10 , October 2010 , pp. 1975 - 1982
Copyright
Copyright © Materials Research Society 2010

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