Effects of macroscopic pores on the damping behavior of foamed commercially pure aluminum

Experiments have been carried out to study the effects of macroscopic pores on the damping behavior of foamed commercially pure aluminum (FA). The damping characterization was conducted on a multifunction internal friction apparatus (MFIFA). The FA specimens were prepared by an air pressure infiltra...

Full description

Saved in:
Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2002-11, Vol.33 (11), p.3565-3568
Main Authors: WEI, J. N, CHENG, H. F, GONG, C. L, HAN, F. S, SHUI, J. P
Format: Article
Language:English
Subjects:
Anelasticity, internal friction, stress relaxation, and mechanical resonances
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Mechanical and acoustical properties of condensed matter
Metals. Metallurgy
Physics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Experiments have been carried out to study the effects of macroscopic pores on the damping behavior of foamed commercially pure aluminum (FA). The damping characterization was conducted on a multifunction internal friction apparatus (MFIFA). The FA specimens were prepared by an air pressure infiltration process. The size of the macroscopic pores was on the order of a millimeter and in large proportions, typically, up to 56 vol pct. The internal friction (IF) of the FA specimen was measured at low frequencies at room temperature. The measured IF shows that FA has a damping capacity, which is enhanced in comparison with bulk commercially pure aluminum, increases with increasing porosity, increases with decreasing macropore size, increases with increasing frequency, and increases with increasing strain amplitude. The microstructural analysis was performed using transmission electron microscopy (TEM). The TEM observations show that a moderate density of dislocation substructures exists near the grain boundaries in the FA. In order to explain these phenomena, the possible operative damping mechanisms in the FA are discussed in light of IF measurements and microstructural observations, and an approximate expression for IF is derived, which is based on the equation of plane waves in elastic material with voids.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-002-0344-6