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Eddy Current Characterization of Metal Foams

Published online by Cambridge University Press:  10 February 2011

K. P. Dharmasena  and
H. N. G. Wadley
K. P. Dharmasena
Affiliation:
Intelligent Processing of Materials Laboratory, University of Virginia, Charlottesville, VA 22903
H. N. G. Wadley
Affiliation:
Intelligent Processing of Materials Laboratory, University of Virginia, Charlottesville, VA 22903
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Abstract

Cellular materials are characterized by their relative density, pore shape and orientation, the average cell size, and the degree of pore interconnectivity which all depend upon the method and conditions used for processing. This has created an interest in non-invasive sensor techniques to characterize the foam structure. Multifrequency electrical impedance measurements were performed using an eddy current technique on open cell aluminum foam with systematically varied relative densities and pore sizes. The impedance was dominated at all frequencies by the amount of metal contained within a probed volume of foam and the tortuosity of the current path. At low frequency, the impedance data were found to be relatively insensitive to pore size variations enabling an independent measure of the relative density. At high frequency, the data indicated a strong dependence on the cell size.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 521: Symposium R – Porous & Cellular Materials for Structural Applications , 1998 , 171
Copyright
Copyright © Materials Research Society 1998

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References

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