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Wednesday, July 10 • 16:30 - 16:50
MICRO-MACRO ANALYSIS OF THE COMPRESSION OF POROUS MEDIA

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Compressed porous materials (fibrous, felts, foams) are widely used in industry. The charaterization of macroscopic intrinsic properties (open porosity, airflow resistivity, tortuosity, viscous and thermal lengths, ...) enables to model a porous medium in various conditions (thicknesses, assembly with other layers, excitation) using the same set of parameters. Unfortunately, the compression process modifies its microstructure and thus, its intrinsic properties. The modeling of the effect of the compression on the modification of macroscopic parameters is of great interest in order to avoid the measurement of the porous medium for each compression rate. Analytic models can be found in the literature but they generally failed when considering high compression rates. This work aims at analyzing the compression effect from the microstructure point of view. The so-called numerical micro-macro approach is employed using 2D and 3D unit cells for modeling fibrous materials and foams. The results are compared with existing analytical models and experimental data. This provides some insight into how the microstructure is modified and why analytical models are limited.

Moderators
FA

francesco Asdrubali

Full Professor, Università Roma Tre - Department of Engineering
TD

Thomas Dupont

Associate Professor, École de Technologie Supérieure (ÉTS)
PL

Philippe Leclaire

Prof., ISAT - University of Burgundy
avatar for Raymond Panneton

Raymond Panneton

Ing., Ph.D., GAUS, Université de Sherbrooke
Raymond Panneton is a professor-researcher in the Department of Mechanical Engineering at the Université de Sherbrooke since 1998. His research program focuses on the modeling, characterization and optimization of porous acoustic media. More specifically, he explores the relationships... Read More →

Authors

Wednesday July 10, 2019 16:30 - 16:50 EDT
St-Laurent 5
  T08 Mat. for noise & vibr. cntrl., SS01 Pasv snd absorb & insul mtrl