Tension-induced tunable corrugation in two-phase soft composites and its properties as a band gap structure

Chen, Qianli

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https://hdl.handle.net/2142/89106 Copy

Description

Title

Tension-induced tunable corrugation in two-phase soft composites and its properties as a band gap structure

Author(s)

Chen, Qianli

Issue Date

2015-12-10

Director of Research (if dissertation) or Advisor (if thesis)

Elbanna, Ahmed Ettaf

Department of Study

Civil & Environmental Engineering

Discipline

Civil Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• Soft composite
• Band gap

Abstract

This thesis numerically investigates the elastic deformation response of a two-phase soft composite under externally applied concentric tension and its properties as a band gap structure. By carefully designing the inclusion pattern, it is possible to induce corrugations normal to the direction of stretch. By stacking 1D composite fibers to form 2D membranes, these corrugations collectively lead to the formation of membrane channels with shapes and sizes tunable by the level of stretch and enable the interfaces to progressively soften and evolve into non-planar geometries characterized by the nucleation and stable growth of interfacial channels of irregular shapes. It is also possible to modulate the band gap profile of the composite structure as a result of interfacial deformations and the corresponding microstructural evolution. Furthermore, by using specific inclusion patterns in laminated plates, it is possible to create pop-ups and troughs enabling the development of complex 3D geometries from planar construction. The corrugation amplitude increases with the stiffness of inclusion and its eccentricity from the tension axis. The techniques discussed in this thesis provide greater flexibility and controllability in pattern design and have potential applications in providing a novel framework for harnessing controlled damage in the development of targeted acoustic band gaps and optimizing damping properties of composites.

Graduation Semester

2015-12

Type of Resource

text

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http://hdl.handle.net/2142/89106

Copyright and License Information

Copyright 2015 Qianli Chen

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