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RESEARCH PRODUCT

Characterization of porous absorbent materials

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International audience; Over the past twenty years, theoretical and experimental research on the acoustical properties of air-saturated porous materials for engineering applications has considerably progressed thanks to the contributions of many researchers in different institutes in the world. Accompanying the research on the acoustical properties of absorbent materials, new methods and experimental techniques were developed for the measurement of important physical parameters of these materials, necessary for the acoustic models. The attention is focused on the particularly important contributions of two laboratories: the Laboratoire d’Acoustique de l’Université du Maine (LAUM) in France and of Laboratorium voor Akoestiek en Thermische Fysica (ATF) in Belgium. A review of the main methods developed over the year in these two laboratories is proposed. This research has been very important for the validation of the models. The methods developed concern the measurement of porosity, tortuosity, flow resistivity, viscous and thermal characteristic lengths, thermal permeability and also the mechanical properties of porous materials (Young’s modulus and the Poisson ratio).