Thermally tunable band gaps in architected metamaterial structures

Chaitanya Nimmagadda, Kathryn H. Matlack

Research output: Contribution to journalArticle

Abstract

The combined characteristics of periodic and locally resonant features in metamaterial structures, or meta-structures, give rise to unique wave propagation characteristics such as relatively low and wide band gaps. These meta-structures have a fixed geometry and thus a fixed behavior, however applications that require structural vibration mitigation such as spacecraft and automotive components have variable vibration mitigation requirements over a range of operation and external conditions. In this paper, we propose a method to thermally tune the band gaps of composite meta-structures, which combine a periodic lattice and locally-resonant inclusions, through changes in temperature of the structure. The concept primarily takes advantage of the different moduli of the two materials in the meta-structure that have drastically different temperature dependences, to preferentially tune the modulus of the lattice material compared to the resonant inclusion. We introduce an additional concept, termed thermal partitioning, to partially or fully open and close band gaps by locally controlling the temperature within the meta-structure. We demonstrate these results numerically with finite element simulations.

Original languageEnglish (US)
Pages (from-to)29-42
Number of pages14
JournalJournal of Sound and Vibration
Volume439
DOIs
StatePublished - Jan 20 2019

Keywords

  • Architected materials
  • Metamaterials
  • Phononic crystals
  • Tunable band gaps
  • Vibration mitigation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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