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Title:Thermally tunable band gaps in architected metamaterial structures
Author(s):Nimmagadda, Chaitanya
Advisor(s):Matlack, Kathryn H
Department / Program:Mechanical Sci & Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:M.S.
Genre:Thesis
Subject(s):Phononic crystals
metamaterials
tunable band gaps
architected materials
vibration mitigation
Abstract:The combined characteristics of periodicity 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 work, 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.
Issue Date:2018-07-17
Type:Thesis
URI:http://hdl.handle.net/2142/101826
Rights Information:Copyright 2018 Chaitanya Nimmagadda
Date Available in IDEALS:2018-09-27
Date Deposited:2018-08


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