Materials Transactions Online

Materials Transactions, Vol.50 No.02 (2009) pp.427-429
© 2009 The Japan Institute of Metals

Effects of Pore Characteristics Finely-Controlled by Spacer Method on Damping Capacity of Porous Aluminum

Masataka Hakamada1, Hiroyuki Watanabe2, Tetsunume Kuromura1, Youqing Chen1, Hiromu Kusuda1 and Mamoru Mabuchi1

1Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japan
2Osaka Municipal Technical Research Institute, Osaka 536-8553, Japan

 The room-temperature damping properties of porous aluminum fabricated by the spacer method were investigated using the method of lateral resonant vibration in cantilever holding. In particular, the effects of the porosity and pore size, which are the representative parameters of porous metals and can be controlled well by spacer method, on the damping properties were focused on. The damping capacity increased with increasing porosity and pore size. Local stress concentration arising from the heterogeneity of porous structures seems responsible for the enhanced damping capacity under the condition in which the main damping mechanism is amplitude-dependent dislocation damping. The present results point out the importance of the porous structure control in damping properties.

(Received 2008/10/20; Accepted 2008/11/26; Published 2009/1/21)

Keywords: aluminum foam, damping, pore size, porosity

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