Wave control through soft microstructural curling: Bandgap shifting, reconfigurable anisotropy and switchable chirality

Paolo Celli, Stefano Gonella, Vahid Tajeddini, Anastasia Muliana, Saad Ahmed, Zoubeida Ounaies

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

In this work, we discuss and numerically validate a strategy to attain reversible macroscopic changes in the wave propagation characteristics of cellular metamaterials with soft microstructures. The proposed cellular architecture is characterized by unit cells featuring auxiliary populations of symmetrically-distributed smart cantilevers stemming from the nodal locations. Through an external stimulus (the application of an electric field), we induce extreme, localized, reversible curling deformation of the cantilevers - a shape modification which does not affect the overall shape, stiffness and load bearing capability of the structure. By carefully engineering the spatial pattern of straight (non activated) and curled (activated) cantilevers, we can induce several profound modifications of the phononic characteristics of the structure: generation and/or shifting of total and partial bandgaps, cell symmetry relaxation (which implies reconfigurable wave beaming), and chirality switching. While in this work we discuss the specific case of composite cantilevers with a PDMS core and active layers of electrostrictive terpolymer P(VDF-TrFE-CTFE), the strategy can be extended to other smart materials (such as dielectric elastomers or shape-memory polymers).

Original languageEnglish (US)
Article number035001
JournalSmart Materials and Structures
Volume26
Issue number3
DOIs
StatePublished - Feb 3 2017

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Bearings (structural)
Elastomers
Terpolymers
Intelligent materials
Chirality
Metamaterials
Shape memory effect
chirality
Wave propagation
Loads (forces)
Polymers
Energy gap
Anisotropy
Electric fields
Stiffness
Microstructure
anisotropy
Composite materials
smart materials
elastomers

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering

Cite this

Celli, Paolo ; Gonella, Stefano ; Tajeddini, Vahid ; Muliana, Anastasia ; Ahmed, Saad ; Ounaies, Zoubeida. / Wave control through soft microstructural curling : Bandgap shifting, reconfigurable anisotropy and switchable chirality. In: Smart Materials and Structures. 2017 ; Vol. 26, No. 3.
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Wave control through soft microstructural curling : Bandgap shifting, reconfigurable anisotropy and switchable chirality. / Celli, Paolo; Gonella, Stefano; Tajeddini, Vahid; Muliana, Anastasia; Ahmed, Saad; Ounaies, Zoubeida.

In: Smart Materials and Structures, Vol. 26, No. 3, 035001, 03.02.2017.

Research output: Contribution to journalArticle

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