We gratefully acknowledge the Agence Nationale de la Recherche (ANR) for financially supporting the Silent Wall project in which this study takes place. Moreover, we are thankful to Bernard Castagnède, Claude Depollier, and Olivier Dazel (LAUM, Laboratoire d'Acoustique de l'Université du Maine, Le Mans, France) for bringing their expert's point of view in acoustics.
3D Morphological Characterization of Phonic Insulation Fibrous Media†
Article first published online: 16 NOV 2010
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Special Issue: 3D-Imaging of Materials and Systems
Volume 13, Issue 3, pages 156–164, March, 2011
How to Cite
Peyrega, C., Jeulin, D., Delisée, C. and Malvestio, J. (2011), 3D Morphological Characterization of Phonic Insulation Fibrous Media. Adv. Eng. Mater., 13: 156–164. doi: 10.1002/adem.201000257
- Issue published online: 1 MAR 2011
- Article first published online: 16 NOV 2010
- Manuscript Accepted: 20 SEP 2010
- Manuscript Received: 26 AUG 2010
In the framework of the Silent Wall ANR project, the CMM and the US2B are associated in order to characterize and to model fibrous media studying 3D images acquired with an X-Ray microtomograph used by the US2B. The device can make 3D images of maximal size 23043 voxels with resolutions in the range of 2–15 µm. Using mathematical morphology, measurements on the 3D X-Ray CT images are performed to characterize materials. For example, measuring the covariance on these images of an acoustic insulating material made of wooden fibers highlights the transverse isotropy of the fibers orientations in the xOy planes perpendicular to the compression Oz axis. Moreover, it is possible to extract other morphological properties, such as the size distribution either of the fibers or of the pores by estimating the morphological opening granulometry of the considered medium. Finally the morphological tortuosity of the fibrous and porous networks are estimated from geodesic propagations. The tortuosity is a parameter which can help to link physical, acoustic, and morphological properties of the material. Moreover the effects of the boundary layer, where viscous and thermal damping of the sound take place, are studied from the point of view of the tortuosity.