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Title: Wave propagation in fractal-inspired self-similar beam lattices

We combine numerical analysis and experiments to investigate the effect of hierarchy on the propagation of elastic waves in triangular beam lattices. While the response of the triangular lattice is characterized by a locally resonant band gap, both Bragg-type and locally resonant gaps are found for the hierarchical lattice. Therefore, our results demonstrate that structural hierarchy can be exploited to introduce an additional type of band gaps, providing a robust strategy for the design of lattice-based metamaterials with hybrid band gap properties (i.e., possessing band gaps that arises from both Bragg scattering and localized resonance)
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [3] ;  [2] ;  [4]
  1. Engineering Science Programme, National University of Singapore, Singapore 117576 (Singapore)
  2. Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138 (United States)
  3. (Singapore)
  4. (United States)
Publication Date:
OSTI Identifier:
22486153
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 22; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAMS; DESIGN; FRACTALS; HYBRIDIZATION; METAMATERIALS; NUMERICAL ANALYSIS; SCATTERING; WAVE PROPAGATION