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Wednesday, July 10 • 13:10 - 13:30
ACOUSTIC THERMOSET OPEN-CELL MULTILAYER FOAMS PRODUCED BY A PARTICULATE LEACHING PROCESS

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With increasing stringent noise standards, stochastic foams are increasingly used in several engineering fields as effective absorbing materials. These materials offer broadband absorp-tion capabilities. However, the frequency range of high absorption is still fairly high. One interesting way to overcome this limitation is the use of multilayered materials with each layer tailored to absorb noise at different frequency range. Another challenge is related to the development of a manufacturing process capable of producing multilayered materials with consistent and repeatable properties. The main objective of this work is to develop a manufacturing process to produce multilayer thermoset foams combining both acoustic and mechanical capabilities. The process is based on the particulate leaching process where both the porosity and the material can be changed through the thickness. Microscopic and X-ray microtomographic analyses were used to assess the efficiency of the process. The acoustical properties by means of a 30mm-diameter impedance tube and the mechanical properties using a standard compression test were investigated. The properties of the multilayered materials were analysed with respect to the number and the order of the layers through the thickness of the material. It is shown that depending on the layer facing the sound wave, multilayer foams can provide either broadband absorption better than the one-layer foams, or resonance–like absorption at low frequencies. The values of the compressive modulus of multilayers are ranged between 5MPa and 20MPa and are generally controlled by the weakest layer.

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 13:10 - 13:30 EDT
St-Laurent 5
  T08 Mat. for noise & vibr. cntrl., SS01 Pasv snd absorb & insul mtrl