Cure-state dependent viscoelastic Poisson’s ratio of LY5052 epoxy resin

It is shown, using thermodynamically consistent linear viscoelastic material model that accounts for properties dependence on test temperature and cure state parameters, that for rheologically simple materials the cure and temperature related reduced times and shift factors are the same for all visc...

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Autores principales:	Sibin Saseendran, Maciej Wysocki, Janis Varna
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2017
Materias:	Poisson’s ratio Viscoelasticity Cure dependence Time dependence Stress relaxation Polymers and polymer manufacture TP1080-1185 Automation T59.5
Acceso en línea:	https://doaj.org/article/780c29d804604b069b9e1688aa3fb26d
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spelling	oai:doaj.org-article:780c29d804604b069b9e1688aa3fb26d2021-12-02T09:22:02ZCure-state dependent viscoelastic Poisson’s ratio of LY5052 epoxy resin2055-03402055-035910.1080/20550340.2017.1348002https://doaj.org/article/780c29d804604b069b9e1688aa3fb26d2017-07-01T00:00:00Zhttp://dx.doi.org/10.1080/20550340.2017.1348002https://doaj.org/toc/2055-0340https://doaj.org/toc/2055-0359It is shown, using thermodynamically consistent linear viscoelastic material model that accounts for properties dependence on test temperature and cure state parameters, that for rheologically simple materials the cure and temperature related reduced times and shift factors are the same for all viscoelastic compliances, relaxation modulus, and Poisson’s ratio as well as for the storage and loss modulus. A necessary condition for that is that the cure and temperature parameters are affecting the reduced time only. This means that the Poisson’s ratio of polymeric materials, which for simplicity is often assumed constant, in fact exhibits a small dependence on time which is affected by temperature and state of cure. In this work, the evolution of the viscoelastic Poisson’s ratio of the commercial LY5052 epoxy resin is studied in relaxation test subjecting the specimen to constant axial strain. Specimens at several cure states are studied and Poisson’s ratio, defined as the lateral and axial strain ratio, is shown to evolve from 0.32 to 0.44 over time. Moreover, the data confirm that the cure state-dependent reduced time controlling the Poisson’s ratio development leads to the same shift functions as those identified in DMTA tests for storage modulus. The latter measurements also confirmed that the total shift can be considered as a sum of two shifts in the frequency domain, which means that function for reduced time calculation can be written as a product of two functions: one dependent on the test temperature and another one dependent on the cure state.Sibin SaseendranMaciej WysockiJanis VarnaTaylor & Francis GrouparticlePoisson’s ratioViscoelasticityCure dependenceTime dependenceStress relaxationPolymers and polymer manufactureTP1080-1185AutomationT59.5ENAdvanced Manufacturing: Polymer & Composites Science, Vol 3, Iss 3, Pp 92-100 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Poisson’s ratio Viscoelasticity Cure dependence Time dependence Stress relaxation Polymers and polymer manufacture TP1080-1185 Automation T59.5
spellingShingle	Poisson’s ratio Viscoelasticity Cure dependence Time dependence Stress relaxation Polymers and polymer manufacture TP1080-1185 Automation T59.5 Sibin Saseendran Maciej Wysocki Janis Varna Cure-state dependent viscoelastic Poisson’s ratio of LY5052 epoxy resin
description	It is shown, using thermodynamically consistent linear viscoelastic material model that accounts for properties dependence on test temperature and cure state parameters, that for rheologically simple materials the cure and temperature related reduced times and shift factors are the same for all viscoelastic compliances, relaxation modulus, and Poisson’s ratio as well as for the storage and loss modulus. A necessary condition for that is that the cure and temperature parameters are affecting the reduced time only. This means that the Poisson’s ratio of polymeric materials, which for simplicity is often assumed constant, in fact exhibits a small dependence on time which is affected by temperature and state of cure. In this work, the evolution of the viscoelastic Poisson’s ratio of the commercial LY5052 epoxy resin is studied in relaxation test subjecting the specimen to constant axial strain. Specimens at several cure states are studied and Poisson’s ratio, defined as the lateral and axial strain ratio, is shown to evolve from 0.32 to 0.44 over time. Moreover, the data confirm that the cure state-dependent reduced time controlling the Poisson’s ratio development leads to the same shift functions as those identified in DMTA tests for storage modulus. The latter measurements also confirmed that the total shift can be considered as a sum of two shifts in the frequency domain, which means that function for reduced time calculation can be written as a product of two functions: one dependent on the test temperature and another one dependent on the cure state.
format	article
author	Sibin Saseendran Maciej Wysocki Janis Varna
author_facet	Sibin Saseendran Maciej Wysocki Janis Varna
author_sort	Sibin Saseendran
title	Cure-state dependent viscoelastic Poisson’s ratio of LY5052 epoxy resin
title_short	Cure-state dependent viscoelastic Poisson’s ratio of LY5052 epoxy resin
title_full	Cure-state dependent viscoelastic Poisson’s ratio of LY5052 epoxy resin
title_fullStr	Cure-state dependent viscoelastic Poisson’s ratio of LY5052 epoxy resin
title_full_unstemmed	Cure-state dependent viscoelastic Poisson’s ratio of LY5052 epoxy resin
title_sort	cure-state dependent viscoelastic poisson’s ratio of ly5052 epoxy resin
publisher	Taylor & Francis Group
publishDate	2017
url	https://doaj.org/article/780c29d804604b069b9e1688aa3fb26d
work_keys_str_mv	AT sibinsaseendran curestatedependentviscoelasticpoissonsratioofly5052epoxyresin AT maciejwysocki curestatedependentviscoelasticpoissonsratioofly5052epoxyresin AT janisvarna curestatedependentviscoelasticpoissonsratioofly5052epoxyresin
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Cure-state dependent viscoelastic Poisson’s ratio of LY5052 epoxy resin

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