Advanced structured composites as novel phononic crystals and acoustic metamaterials

Kathryn H. Matlack, Sebastian Krödel, Anton Bauhofer, Chiara Daraio

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


We design and test new periodic materials that can reflect and prohibit the propagation of structural vibrations. These materials are engineered as periodic structures with resonant elements. We rely on recent advances in additive manufacturing to 3-D print composite materials that combine periodically embedded metal resonators within a periodic, truss-like polycarbonate lattice structure, functioning as a support matrix. The polycarbonate lattice geometry allows the matrix to be ultra-low density yet load bearing, and have tunable density and tunable effective elastic modulus. The high acoustic impedance mismatch between this lattice and the metal resonators opens the possibility to create materials with low frequency and wide band gaps, or frequencies where acoustic propagation is forbidden, using a combination of Bragg scattering effects with effects due to the presence of local resonators. Finite element modeling is used to analyze various lattice geometries, lattice densities, and resonator locations to show materials with tunable acoustic properties.

Original languageEnglish (US)
Title of host publicationMechanics of Composite and Multi-functional Materials - Proceedings of the 2015 Annual Conference on Experimental and Applied Mechanics
EditorsPiyush R. Thakre, Carter Ralph, Meredith Silberstein, Raman Singh
Number of pages8
ISBN (Print)9783319217611
StatePublished - 2016
Externally publishedYes
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2015 - Costa Mesa, United States
Duration: Jun 8 2015Jun 11 2015

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


OtherSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2015
Country/TerritoryUnited States
CityCosta Mesa


  • 3D printing
  • Band gaps
  • Locally resonant acoustic metamaterial
  • Phononic crystals
  • Structural vibrations

ASJC Scopus subject areas

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering


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