Buckling patterns on pre-stretched bilayer shells
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017. === Cataloged from PDF version of thesis. === Includes bibliographical references (pages 59-63). === We introduce a new experimental system to study the effects of pre-stretch on the buckling patterns th...
Main Author: | |
---|---|
Other Authors: | |
Format: | Others |
Language: | English |
Published: |
Massachusetts Institute of Technology
2018
|
Subjects: | |
Online Access: | http://hdl.handle.net/1721.1/113759 |
id |
ndltd-MIT-oai-dspace.mit.edu-1721.1-113759 |
---|---|
record_format |
oai_dc |
spelling |
ndltd-MIT-oai-dspace.mit.edu-1721.1-1137592019-05-02T16:12:07Z Buckling patterns on pre-stretched bilayer shells Al-Rashed, Rashed Abdulazeez Pedro M. Reis. Massachusetts Institute of Technology. Department of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering. Mechanical Engineering. Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017. Cataloged from PDF version of thesis. Includes bibliographical references (pages 59-63). We introduce a new experimental system to study the effects of pre-stretch on the buckling patterns that emerge from the biaxial compression of elastomeric bilayer shells. After fabricating our samples, releasing the pre-stretch in the substrate by deflation places the outer film in a state of biaxial compression and yields a variety of buckling patterns. We systematically explore the parameter space by varying the pre-stretch of the substrate and the ratio of film stiffness to substrate stiffness. The phase diagram of the system exhibits a variety of buckling patterns: from the classic periodic wrinkle to creases, folds, and high aspect ratio ridges. Our system is capable of easily transitioning between these buckling patterns, a first for biaxial systems. We focus on the wrinkle to ridge transition, where we find that pre-stretch plays an essential role in ridge formation, and that the ridge geometry (width, height) remains approximately constant throughout the process. For the localized ridge patterns, we find that the propagation of the ridge tip depends strongly on both strain and stiffness ratio, in a way that is akin to hierarchical fracture of brittle coatings. by Rashed Abdulazeez Al-Rashed. S.M. 2018-02-16T20:04:40Z 2018-02-16T20:04:40Z 2017 2017 Thesis http://hdl.handle.net/1721.1/113759 1022267832 eng MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 63 pages application/pdf Massachusetts Institute of Technology |
collection |
NDLTD |
language |
English |
format |
Others
|
sources |
NDLTD |
topic |
Mechanical Engineering. |
spellingShingle |
Mechanical Engineering. Al-Rashed, Rashed Abdulazeez Buckling patterns on pre-stretched bilayer shells |
description |
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017. === Cataloged from PDF version of thesis. === Includes bibliographical references (pages 59-63). === We introduce a new experimental system to study the effects of pre-stretch on the buckling patterns that emerge from the biaxial compression of elastomeric bilayer shells. After fabricating our samples, releasing the pre-stretch in the substrate by deflation places the outer film in a state of biaxial compression and yields a variety of buckling patterns. We systematically explore the parameter space by varying the pre-stretch of the substrate and the ratio of film stiffness to substrate stiffness. The phase diagram of the system exhibits a variety of buckling patterns: from the classic periodic wrinkle to creases, folds, and high aspect ratio ridges. Our system is capable of easily transitioning between these buckling patterns, a first for biaxial systems. We focus on the wrinkle to ridge transition, where we find that pre-stretch plays an essential role in ridge formation, and that the ridge geometry (width, height) remains approximately constant throughout the process. For the localized ridge patterns, we find that the propagation of the ridge tip depends strongly on both strain and stiffness ratio, in a way that is akin to hierarchical fracture of brittle coatings. === by Rashed Abdulazeez Al-Rashed. === S.M. |
author2 |
Pedro M. Reis. |
author_facet |
Pedro M. Reis. Al-Rashed, Rashed Abdulazeez |
author |
Al-Rashed, Rashed Abdulazeez |
author_sort |
Al-Rashed, Rashed Abdulazeez |
title |
Buckling patterns on pre-stretched bilayer shells |
title_short |
Buckling patterns on pre-stretched bilayer shells |
title_full |
Buckling patterns on pre-stretched bilayer shells |
title_fullStr |
Buckling patterns on pre-stretched bilayer shells |
title_full_unstemmed |
Buckling patterns on pre-stretched bilayer shells |
title_sort |
buckling patterns on pre-stretched bilayer shells |
publisher |
Massachusetts Institute of Technology |
publishDate |
2018 |
url |
http://hdl.handle.net/1721.1/113759 |
work_keys_str_mv |
AT alrashedrashedabdulazeez bucklingpatternsonprestretchedbilayershells |
_version_ |
1719036198391906304 |