Negative refraction in conventional and additively manufactured phononic crystals

Lorenzo Astolfi, Richard L. Watson, David A. Hutchins, Peter J. Thomas, Meisam Askari, Adam T. Clare, Luzhen Nie, Steven Freear, Stefano Laureti, Marco Ricci

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Phononic crystals are acoustic metamaterials designed to manipulate sound when its wavelength is in the order of magnitude of the crystal lattice constant. Metallic phononic crystals for use in water were assembled using commercially available stainless steel rods with an average superficial roughness Ra=0.5±0.5 μm, while Laser Powder Bed Fabrication, an additive manufacturing technique, was employed to produce similar Inconel 718 structures with Ra=20±6 μm. Experiments in the 150 - 500 kHz frequency range indicated that acoustic band gaps and negative refraction were present in both cases, with similar features. This indicates that Laser Powder Bed Fabrication is a promising method for realising such phononic crystals.

Original languageEnglish
Title of host publication2019 IEEE International Ultrasonics Symposium, IUS 2019
PublisherIEEE
Pages2529-2532
Number of pages4
ISBN (Electronic)9781728145969
ISBN (Print)9781728145976
DOIs
Publication statusPublished - 9 Dec 2019
Event2019 IEEE International Ultrasonics Symposium, IUS 2019 - Glasgow, United Kingdom
Duration: 6 Oct 20199 Oct 2019

Publication series

NameIEEE International Ultrasonics Symposium, IUS
Volume2019-October
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727

Conference

Conference2019 IEEE International Ultrasonics Symposium, IUS 2019
Country/TerritoryUnited Kingdom
CityGlasgow
Period6/10/199/10/19

Keywords

  • Band Gaps
  • Laser Powder Bed Fabrication
  • Metamaterial
  • Negative Refraction
  • Phononic Crystal
  • Selective Laser Melting

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