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Permanent link (DOI): https://doi.org/10.7939/R3GM4X

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Developing Design Guidelines for Improved Gecko Inspired Dry Adhesive Performance Open Access

Descriptions

Other title
Subject/Keyword
Friction
Gecko
Adhesion
Hyperelastic
Simulation
Viscoelastic
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Bschaden, Benjamin Simon
Supervisor and department
Sameoto, Dan (Mechanical Engineering)
Examining committee member and department
Elias, Anastasia (Chemical and Materials Engineering)
Long, Rong (Mechanical Engineering)
Department
Department of Mechanical Engineering
Specialization

Date accepted
2014-03-27T11:12:26Z
Graduation date
2014-06
Degree
Master of Science
Degree level
Master's
Abstract
This work provides a guideline for gecko inspired dry adhesive design and simulation. Mechanical property testing for several polymers commonly used in gecko adhesives (Kraton G1657 thermoplastic elastomer, ST-1060, and ST-1087 polyurethane elastomers) allowed hyperelastic and viscoelastic material models to be fitted. These parameters were implemented in a finite element simulation of a single adhesive fiber. The simulation was further improved over previously published models by developing a frictional cap interface boundary condition. The simulation was verified by contrasting the results obtained by testing isolated fibers. Adhesion results from a single fiber tests system developed demonstrated that all materials exhibit the Mullins effect, with significant softening after one elongation. Future designs requiring durability are therefore recommended to have lower aspect ratios, limiting the maximum strain in the fiber. Based on experimental observations, a summary is provided to select appropriate boundary conditions based on the specifications of the adhesive.
Language
English
DOI
doi:10.7939/R3GM4X
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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