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Effects of pore morphology on fatigue strength and fracture surface of lotus-type porous copper

Published online by Cambridge University Press:  03 March 2011

H. Seki ,
M. Tane ,
M. Otsuka  and
H. Nakajima
H. Seki
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
M. Tane*
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
M. Otsuka
Affiliation:
Shibaura Institute of Technology, Koto-ku, Tokyo 135-8548, Japan
H. Nakajima
Affiliation:
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
*
a) Address all correspondence to this author. e-mail: mtane@sanken.osaka-u.ac.jp
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Abstract

We studied the effect of anisotropic pore morphology on the fatigue behavior and fracture surface of lotus-type porous copper, which was fabricated through unidirectional solidification in pressurized hydrogen and argon atmospheres. The fatigue strength at finite life is closely related to the pore morphology. The fatigue strength decreases with increasing porosity, and the strength depends on applied-stress direction. The fatigue life is the longest in the direction parallel to the longitudinal axis of cylindrical pores. The fatigue strength at finite life is proportional to the ultimate tensile strength and can be expressed by a simple power-law formula. Anisotropic pores affect the fracture surface of lotus copper; crack-initiation site depends on applied-stress direction, and the anisotropic shape pores affect the direction of crack propagation and final fracture surface.

Keywords

CuFatiguePorosity
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 5 , May 2007 , pp. 1331 - 1338
Copyright
Copyright © Materials Research Society 2007

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