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On thermo-viscoelastic experimental characterisation and numerical modelling of VHB polymer

Zisheng Liao, Mokarram Hossain Orcid Logo, Xiaohu Yao, Markus Mehnert, Paul Steinmann

International Journal of Non-Linear Mechanics, Start page: 103263

Swansea University Author: Mokarram Hossain Orcid Logo

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Abstract

Recently, the so-called Very High Bond (VHB in short) tape has proven to be an ideal polymer for producing devices made of electric field-responsive functional materials, e.g., actuators in soft robotics, stretch sensors in wearable devices, and energy harvesters generating power from ambient motion...

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Published in: International Journal of Non-Linear Mechanics
ISSN: 0020-7462
Published: Elsevier 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa51753
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spelling 2019-09-10T10:38:56.0151797 v2 51753 2019-09-10 On thermo-viscoelastic experimental characterisation and numerical modelling of VHB polymer 140f4aa5c5ec18ec173c8542a7fddafd 0000-0002-4616-1104 Mokarram Hossain Mokarram Hossain true false 2019-09-10 GENG Recently, the so-called Very High Bond (VHB in short) tape has proven to be an ideal polymer for producing devices made of electric field-responsive functional materials, e.g., actuators in soft robotics, stretch sensors in wearable devices, and energy harvesters generating power from ambient motions. The VHB polymer is commercially available in several thicknesses. For this study, we have selected VHB 4905 due to its wide use as a common material for dielectric elastomers. The acrylic-based polymer is highly deformable, extremely viscoelastic, and highly sensitive to temperature fluctuations. Hence, in order to understand its mechanical and electro-mechanical behaviour, extensive experiments need to be conducted to unravel temperature dependencies in addition to strain-rate dependences. In this study, we present a wide variety of temperature experiments ranging from -30C to 80C at various strain rates and stretch levels under homogeneous deformation and temperature fields. The study demonstrates a pronounced influence of the temperature on the mechanical response of the VHB polymer. For VHB within the temperature range of our study, an increased temperature mechanically softens the material and vice-versa. After conducting a wide range of experiments, we propose a finite strain thermo-viscoelastic constitutive model that is an extension of a phenomenologically-motivated model where a non-linear evolution law is devised based on the classical concept of the multiplicative decomposition of the deformation gradient. Then, decoupled one-dimensional equations are derived and fitted to experimental data to identify relevant material parameters appearing in the model. The thermo-viscoelastic model validation shows its reasonably good capability to predict the experimental results. Journal Article International Journal of Non-Linear Mechanics 103263 Elsevier 0020-7462 VHB polymer, Thermo-viscoelasticity, Temperature dependence, Dielectric elastomers 31 12 2019 2019-12-31 10.1016/j.ijnonlinmec.2019.103263 https://www.sciencedirect.com/science/article/pii/S0020746219303415 COLLEGE NANME General Engineering COLLEGE CODE GENG Swansea University 2019-09-10T10:38:56.0151797 2019-09-10T06:24:27.3896369 College of Engineering Engineering Zisheng Liao 1 Mokarram Hossain 0000-0002-4616-1104 2 Xiaohu Yao 3 Markus Mehnert 4 Paul Steinmann 5 0051753-10092019103806.pdf liao2019(2).pdf 2019-09-10T10:38:06.1300000 Output 3803004 application/pdf Accepted Manuscript true 2020-09-09T00:00:00.0000000 © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ false eng
title On thermo-viscoelastic experimental characterisation and numerical modelling of VHB polymer
spellingShingle On thermo-viscoelastic experimental characterisation and numerical modelling of VHB polymer
Mokarram Hossain
title_short On thermo-viscoelastic experimental characterisation and numerical modelling of VHB polymer
title_full On thermo-viscoelastic experimental characterisation and numerical modelling of VHB polymer
title_fullStr On thermo-viscoelastic experimental characterisation and numerical modelling of VHB polymer
title_full_unstemmed On thermo-viscoelastic experimental characterisation and numerical modelling of VHB polymer
title_sort On thermo-viscoelastic experimental characterisation and numerical modelling of VHB polymer
author_id_str_mv 140f4aa5c5ec18ec173c8542a7fddafd
author_id_fullname_str_mv 140f4aa5c5ec18ec173c8542a7fddafd_***_Mokarram Hossain
author Mokarram Hossain
author2 Zisheng Liao
Mokarram Hossain
Xiaohu Yao
Markus Mehnert
Paul Steinmann
format Journal article
container_title International Journal of Non-Linear Mechanics
container_start_page 103263
publishDate 2019
institution Swansea University
issn 0020-7462
doi_str_mv 10.1016/j.ijnonlinmec.2019.103263
publisher Elsevier
college_str College of Engineering
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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
url https://www.sciencedirect.com/science/article/pii/S0020746219303415
document_store_str 1
active_str 0
description Recently, the so-called Very High Bond (VHB in short) tape has proven to be an ideal polymer for producing devices made of electric field-responsive functional materials, e.g., actuators in soft robotics, stretch sensors in wearable devices, and energy harvesters generating power from ambient motions. The VHB polymer is commercially available in several thicknesses. For this study, we have selected VHB 4905 due to its wide use as a common material for dielectric elastomers. The acrylic-based polymer is highly deformable, extremely viscoelastic, and highly sensitive to temperature fluctuations. Hence, in order to understand its mechanical and electro-mechanical behaviour, extensive experiments need to be conducted to unravel temperature dependencies in addition to strain-rate dependences. In this study, we present a wide variety of temperature experiments ranging from -30C to 80C at various strain rates and stretch levels under homogeneous deformation and temperature fields. The study demonstrates a pronounced influence of the temperature on the mechanical response of the VHB polymer. For VHB within the temperature range of our study, an increased temperature mechanically softens the material and vice-versa. After conducting a wide range of experiments, we propose a finite strain thermo-viscoelastic constitutive model that is an extension of a phenomenologically-motivated model where a non-linear evolution law is devised based on the classical concept of the multiplicative decomposition of the deformation gradient. Then, decoupled one-dimensional equations are derived and fitted to experimental data to identify relevant material parameters appearing in the model. The thermo-viscoelastic model validation shows its reasonably good capability to predict the experimental results.
published_date 2019-12-31T04:05:26Z
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