INTERNAL FRICTION FEATURES OF FOAMED Al IN-LOWER FREQUENCY

1 January 1997

journal article
Published by Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences in Acta Physica Sinica

Vol. 46 (8) , 1585-1592
https://doi.org/10.7498/aps.46.1585

Abstract

Foamed aluminium (Al) specimens have been prepared by powder metallurgy foaming technique.At room temperature,variations of its internal friction vs porosity,frequency and strain amplitude were measured systematically.The results indicate that internal friction of foamed Al has such characteristics as follows.It increases with increasing porosity and with decreasing pore size.At lower frequencies,it is independent of frequency;it-has a normal amplitude effect.The damping mechanism of foamed Al has been studied.According to the damping mechanism of foamed Al,the experimental results have been explained with some success.

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