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Conference Papers Year : 2020

Micro-macro acoustic modeling of heterogeneous foams with nucleation perturbation

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Vincent Langlois
Michel Bornert
Arnaud Duval
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Abstract

The properties of a polyurethane foam are greatly influenced by the addition of graphite particles during the manufacturing process, initially used as a fire retardant. These thin solid particles perturbate the nucleation process by generating bubbles in their immediate vicinity. A large body of work has focused on foams that are reasonably homogeneous. In this work, we propose a modeling approach for inhomogeneous foams that includes membrane effects and allows pore size distributions to be accounted for. The cellular structure of the foam is obtained through a random Laguerre tessellation optimized from experimental properties. The structure of real foam samples is analyzed using X-ray computed tomography and scanning electron microscopy, followed by image processing, to create three-dimensional, digital models of the samples. The corresponding effective material parameters, including the permeability, the tortuosity and the viscous characteristic length, are subsequently computed by applying a numerical homogenization approach. All the numerical data are presented, discussed and gauged against experimental results.
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Dates and versions

hal-03020074 , version 1 (11-12-2020)

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Cong Truc Nguyen, Johann Guilleminot, Fabrice Detrez, Vincent Langlois, Michel Bornert, et al.. Micro-macro acoustic modeling of heterogeneous foams with nucleation perturbation. The 11th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference (ISNVH 2020), Nov 2020, Graz, Austria. ⟨10.4271/2020-01-1526⟩. ⟨hal-03020074⟩
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