Abstract
Foamed aluminum is a promising candidate in hydroacoustics for a pressure material in the dry state and for sound absorption when saturated with a viscous liquid. Its shear modulus was measured with a method described by R. L. Adkins in 1966. The material is sandwiched between two metal plates: the bottom plate is driven by a shaker, and the top one forms a mass-spring system with the sample. The complex voltage ratio is measured of two accelerometers attached to the top and bottom plates. The complex shear modulus is extracted from the data by a novel complex root finder. The results are shown as a function of porosity and pore size and compared with a model by Skorokhod. The method is also used for the determination of the shear modulus of elastomers. This enables a mutual compatibility check between measurements of shear, Young’s, bulk, and plane wave modulus.
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