The applicability of the effective medium theory to the dynamics of cellular beams

Article


Banerjee, Sourish and Bhaskar, Atul. 2009. "The applicability of the effective medium theory to the dynamics of cellular beams." International Journal of Mechanical Sciences. 51 (8), pp. 598-608. https://doi.org/10.1016/j.ijmecsci.2009.06.001
Article Title

The applicability of the effective medium theory to the dynamics of cellular beams

ERA Journal ID3680
Article CategoryArticle
AuthorsBanerjee, Sourish and Bhaskar, Atul
Journal TitleInternational Journal of Mechanical Sciences
Journal Citation51 (8), pp. 598-608
Number of Pages11
Year2009
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0020-7403
1879-2162
Digital Object Identifier (DOI)https://doi.org/10.1016/j.ijmecsci.2009.06.001
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0020740309001076
Abstract

The applicability and the limitations of the effective medium assumption for the dynamics of cellular beams are studied. Beams made of uniform triangular and regular hexagonal cells are analysed. The natural frequencies and modal distributions as calculated using the detailed finite element model of the cellular networks are compared with those predicted based on equivalent homogeneous media of the same overall size and shape. It is observed that, for low mode number, a cellular beam behaves as a continuum, provided the cell size is significantly smaller than the external dimensions of the beam. Due to different deformation mechanisms, triangular cells show frequencies independent of area fraction whereas hexagonal cells show this dependence clearly. As the wavelength starts to become of the order of the heterogeneity, the continuum behaviour begins to break down. With the increase in mode number, cellular beams exhibit inherent flexibility with a progressive increase in their modal densities as compared to those of a homogeneous continuum. The modal density increases further when the cell walls start to resonate. During resonance, an abrupt rise in the modal density is observed for the triangular cells as the cell walls start deforming in the flexural mode instead of the axial mode. In contrast, for hexagonal cells, the predominant mode of cell wall deformation is always flexural. Crown Copyright © 2009.

KeywordsCellular solids; Structural vibration
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020401702. Dynamics, vibration and vibration control
401602. Composite and hybrid materials
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FunderEngineering and Physical Sciences Research Council, UK
Byline AffiliationsUniversity of Auckland, New Zealand
University of Southampton, United Kingdom
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