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

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  • Hakamada Masataka
    Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University
  • Watanabe Hiroyuki
    Osaka Municipal Technical Research Institute
  • Kuromura Tetsunume
    Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University
  • Chen Youqing
    Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University
  • Kusuda Hiromu
    Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University
  • Mabuchi Mamoru
    Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University

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Abstract

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.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 50 (2), 427-429, 2009

    The Japan Institute of Metals and Materials

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