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Harnessing Multiple Folding Mechanisms in Soft Periodic Structures for Tunable Control of Elastic Waves
Author(s) -
Shan Sicong,
Kang Sung H.,
Wang Pai,
Qu Cangyu,
Shian Samuel,
Chen Elizabeth R.,
Bertoldi Katia
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201400665
Subject(s) - materials science , buckling , instability , elastomer , folding (dsp implementation) , homogeneous , porosity , finite element method , elastic instability , range (aeronautics) , nanotechnology , mechanics , composite material , structural engineering , physics , statistical physics , engineering
Mechanical instabilities in periodic porous elastic structures may lead to the formation of homogeneous patterns, opening avenues for a wide range of applications that are related to the geometry of the system. This study focuses on an elastomeric porous structure comprising a triangular array of circular holes, and shows that by controlling the loading direction, multiple pattern transformations can be induced by buckling. Interestingly, these different pattern transformations can be exploited to design materials with highly tunable properties. In particular, these results indicate that they can be effectively used to tune the propagation of elastic waves in phononic crystals, enhancing the tunability of the dynamic response of the system. Using a combination of finite element simulations and experiments, a proof‐of‐concept of the novel material is demonstrated. Since the proposed mechanism is induced by elastic instability, it is reversible, repeatable, and scale‐independent, opening avenues for the design of highly tunable materials and devices over a wide range of length scales.