Abstract
Foamed aluminum is a promising candidate in hydroacoustics for pressure‐release material in the dry state, and for sound absorption, when saturated with a viscous liquid. Previously the dynamic shear modulus measurement of this material has been reported, as a function of density and pore size [Proc. IEEE 1985 Ultrasonics Symp. 2, 1052–1055 (1985)]. To characterize the elastic properties, at least one other modulus measurement is required. It is difficult to conceive how the bulk modulus could be determined. The dynamic Young's modulus may be found by measuring the extension of a beam by means of accelerometers. In the present experiment the dynamic Poisson's ratio and Young's modulus of the same sample were determined by the use of laser Doppler velocimetry. The results are given for foamed aluminum of varying porosity and pore size, and the consistency with measurements of the shear modulus is discussed.
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