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Open AccessArticle

Introducing Obliquely Perforated Phononic Plates for Enhanced Bandgap Efficiency

1
Department of Materials, Textiles and Chemical Engineering, Ghent University, Technologiepark-Zwijnaarde 903, 9052 Zwijnaarde, Belgium
2
School of Engineering, University of South Australia, Mawson Lakes, SA 5095, Australia
*
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1309; https://doi.org/10.3390/ma11081309
Received: 6 June 2018 / Revised: 19 July 2018 / Accepted: 25 July 2018 / Published: 28 July 2018
(This article belongs to the Special Issue State-of-the-Art Materials Science in Belgium 2017)
Porous phononic crystal plates (PhPs) that are produced by perpendicular perforation of a uniform plate have well-known characteristics in selective manipulation (filtration, resonation, and steering) of guided wave modes. This paper introduces novel designs of porous PhPs made by an oblique perforation angle. Such obliquely perforated PhPs (OPhPs) have a non-uniform through-the-thickness cross section, which strongly affects their interaction with various wave mode types and therefore their corresponding phononic properties. Modal band analysis is performed in unit-cell scale and variation of phononic bandgaps with respect to the perforation angle is studied within the first 10 modal branches. Unit-cells with arbitrary perforation profile as well as unit-cells with optimized topology for maximized bandgap of fundamental modes are investigated. It is observed that the oblique perforation has promising effects in enhancing the unidirectional and/or omnidirectional bandgap efficiency, depending on the topology and perforation angle of OPhP. View Full-Text
Keywords: Phononic Crystal; Plate; Oblique Perforation; Bandgap Phononic Crystal; Plate; Oblique Perforation; Bandgap
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MDPI and ACS Style

Hedayatrasa, S.; Kersemans, M.; Abhary, K.; Van Paepegem, W. Introducing Obliquely Perforated Phononic Plates for Enhanced Bandgap Efficiency. Materials 2018, 11, 1309.

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