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Experimental study and phenomenological modelling of flaw sensitivity of two polymers used as dielectric elastomers

Dilshad Ahmad, Karali Patra, Mokarram Hossain Orcid Logo

Continuum Mechanics and Thermodynamics

Swansea University Author: Mokarram Hossain Orcid Logo

Abstract

The extreme stretching of dielectric elastomers in sensors, actuators and energy harvesting devices is a common phenomenon where the materials are prone to fracture under the influence of flaws and notches. In this work, we have investigated the length of flaw sensitivities of two widely used dielec...

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Published in: Continuum Mechanics and Thermodynamics
ISSN: 0935-1175 1432-0959
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa51375
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spelling 2019-09-05T14:46:31.6349221 v2 51375 2019-08-12 Experimental study and phenomenological modelling of flaw sensitivity of two polymers used as dielectric elastomers 140f4aa5c5ec18ec173c8542a7fddafd 0000-0002-4616-1104 Mokarram Hossain Mokarram Hossain true false 2019-08-12 GENG The extreme stretching of dielectric elastomers in sensors, actuators and energy harvesting devices is a common phenomenon where the materials are prone to fracture under the influence of flaws and notches. In this work, we have investigated the length of flaw sensitivities of two widely used dielectric materials, acrylic (VHB) and silicone (Ecoflex) elastomers under a pure shear loading and established that the length of flaw sensitivity of acrylic is almost double than that of silicone. Therefore, the acrylic elastomer is safer to operate for small notches as compared to the silicone material. However, within the flaw-sensitive length, failure stretch, fracture toughness and failure stress are more for Ecoflex than those for VHB. It is found that the failure stretch and the fracture toughness decrease drastically after the length of flaw sensitivities for both materials. Also, the failure stress keeps on decreasing with an increase in notch length for both materials. Afterwards, a simple phenomenological relation is proposed for fitting experimental results under a pure shear loading with only two parameters. The mathematical relation is valid for both the materials and covers the notch sensitivity with a good agreement. Journal Article Continuum Mechanics and Thermodynamics 0935-1175 1432-0959 Dielectric elastomer, Stretchability, Length of flaw sensitivity, Pure shear, Fracture toughness 31 12 2019 2019-12-31 10.1007/s00161-019-00817-8 COLLEGE NANME General Engineering COLLEGE CODE GENG Swansea University 2019-09-05T14:46:31.6349221 2019-08-12T09:26:25.7753362 College of Engineering Engineering Dilshad Ahmad 1 Karali Patra 2 Mokarram Hossain 0000-0002-4616-1104 3 0051375-12082019092912.pdf ahmed2019.pdf 2019-08-12T09:29:12.4170000 Output 2652086 application/pdf Accepted Manuscript true 2020-08-12T00:00:00.0000000 true eng
title Experimental study and phenomenological modelling of flaw sensitivity of two polymers used as dielectric elastomers
spellingShingle Experimental study and phenomenological modelling of flaw sensitivity of two polymers used as dielectric elastomers
Mokarram Hossain
title_short Experimental study and phenomenological modelling of flaw sensitivity of two polymers used as dielectric elastomers
title_full Experimental study and phenomenological modelling of flaw sensitivity of two polymers used as dielectric elastomers
title_fullStr Experimental study and phenomenological modelling of flaw sensitivity of two polymers used as dielectric elastomers
title_full_unstemmed Experimental study and phenomenological modelling of flaw sensitivity of two polymers used as dielectric elastomers
title_sort Experimental study and phenomenological modelling of flaw sensitivity of two polymers used as dielectric elastomers
author_id_str_mv 140f4aa5c5ec18ec173c8542a7fddafd
author_id_fullname_str_mv 140f4aa5c5ec18ec173c8542a7fddafd_***_Mokarram Hossain
author Mokarram Hossain
author2 Dilshad Ahmad
Karali Patra
Mokarram Hossain
format Journal article
container_title Continuum Mechanics and Thermodynamics
publishDate 2019
institution Swansea University
issn 0935-1175
1432-0959
doi_str_mv 10.1007/s00161-019-00817-8
college_str College of Engineering
hierarchytype
hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
document_store_str 1
active_str 0
description The extreme stretching of dielectric elastomers in sensors, actuators and energy harvesting devices is a common phenomenon where the materials are prone to fracture under the influence of flaws and notches. In this work, we have investigated the length of flaw sensitivities of two widely used dielectric materials, acrylic (VHB) and silicone (Ecoflex) elastomers under a pure shear loading and established that the length of flaw sensitivity of acrylic is almost double than that of silicone. Therefore, the acrylic elastomer is safer to operate for small notches as compared to the silicone material. However, within the flaw-sensitive length, failure stretch, fracture toughness and failure stress are more for Ecoflex than those for VHB. It is found that the failure stretch and the fracture toughness decrease drastically after the length of flaw sensitivities for both materials. Also, the failure stress keeps on decreasing with an increase in notch length for both materials. Afterwards, a simple phenomenological relation is proposed for fitting experimental results under a pure shear loading with only two parameters. The mathematical relation is valid for both the materials and covers the notch sensitivity with a good agreement.
published_date 2019-12-31T04:04:59Z
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score 10.900257