Experimental study on the effects of hygrothermal aging on the indentation creep behaviors of PMMA

The effects of aging time on indentation creep behaviors of Polymethyl methacrylate (PMMA) have been investigated and the creep displacement was found to increase with aging time. However, the rate of change weakens as aging time increases. The generalized Calvin model consists of three Voigt elemen...

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Autores principales:	Lin Lv, Hui Lin, Tao Jin
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Pressure-sensitive polymer Hygrothermal aging Indentation creep Elastic-viscoelastic viscous model Time-dependent deformation Polymers and polymer manufacture TP1080-1185
Acceso en línea:	https://doaj.org/article/807dc46d5b5146cca97802ed4b78bf6b
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spelling	oai:doaj.org-article:807dc46d5b5146cca97802ed4b78bf6b2021-11-24T04:25:50ZExperimental study on the effects of hygrothermal aging on the indentation creep behaviors of PMMA0142-941810.1016/j.polymertesting.2020.106991https://doaj.org/article/807dc46d5b5146cca97802ed4b78bf6b2021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0142941820322200https://doaj.org/toc/0142-9418The effects of aging time on indentation creep behaviors of Polymethyl methacrylate (PMMA) have been investigated and the creep displacement was found to increase with aging time. However, the rate of change weakens as aging time increases. The generalized Calvin model consists of three Voigt elements that provide a good description of the indentation creep behavior of PMMA during the holding stage. Each Voigt element represents the motions with different levels i.e. molecular chain, molecular chain segments, molecular chain linkage, and branched-chain. The motions of molecular chain with different levels always have different delay times. The mechanism on the effects of aging time on the indentation creep responses is analyzed by comparing the contributions of different deformation types to total deformation. The contribution of elastic deformation to the total deformation Rhe decreases initially and then increases as aging time increases, which indicates the weakening of elastic modulus results from hygrothermal aging. With the aging time increasing, the contribution of time-dependent deformation to the total deformation i.e. Rhev+Rhvfirst increases and then decreases, which can be attributed to the different aging mechanisms at different stages. Further studies on the effects of aging time on creep compliance and time delay spectrum of PMMA during the holding stage indicates different deformation levels of PMMA characterized by different Voigt elements.Lin LvHui LinTao JinElsevierarticlePressure-sensitive polymerHygrothermal agingIndentation creepElastic-viscoelastic viscous modelTime-dependent deformationPolymers and polymer manufactureTP1080-1185ENPolymer Testing, Vol 93, Iss , Pp 106991- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Pressure-sensitive polymer Hygrothermal aging Indentation creep Elastic-viscoelastic viscous model Time-dependent deformation Polymers and polymer manufacture TP1080-1185
spellingShingle	Pressure-sensitive polymer Hygrothermal aging Indentation creep Elastic-viscoelastic viscous model Time-dependent deformation Polymers and polymer manufacture TP1080-1185 Lin Lv Hui Lin Tao Jin Experimental study on the effects of hygrothermal aging on the indentation creep behaviors of PMMA
description	The effects of aging time on indentation creep behaviors of Polymethyl methacrylate (PMMA) have been investigated and the creep displacement was found to increase with aging time. However, the rate of change weakens as aging time increases. The generalized Calvin model consists of three Voigt elements that provide a good description of the indentation creep behavior of PMMA during the holding stage. Each Voigt element represents the motions with different levels i.e. molecular chain, molecular chain segments, molecular chain linkage, and branched-chain. The motions of molecular chain with different levels always have different delay times. The mechanism on the effects of aging time on the indentation creep responses is analyzed by comparing the contributions of different deformation types to total deformation. The contribution of elastic deformation to the total deformation Rhe decreases initially and then increases as aging time increases, which indicates the weakening of elastic modulus results from hygrothermal aging. With the aging time increasing, the contribution of time-dependent deformation to the total deformation i.e. Rhev+Rhvfirst increases and then decreases, which can be attributed to the different aging mechanisms at different stages. Further studies on the effects of aging time on creep compliance and time delay spectrum of PMMA during the holding stage indicates different deformation levels of PMMA characterized by different Voigt elements.
format	article
author	Lin Lv Hui Lin Tao Jin
author_facet	Lin Lv Hui Lin Tao Jin
author_sort	Lin Lv
title	Experimental study on the effects of hygrothermal aging on the indentation creep behaviors of PMMA
title_short	Experimental study on the effects of hygrothermal aging on the indentation creep behaviors of PMMA
title_full	Experimental study on the effects of hygrothermal aging on the indentation creep behaviors of PMMA
title_fullStr	Experimental study on the effects of hygrothermal aging on the indentation creep behaviors of PMMA
title_full_unstemmed	Experimental study on the effects of hygrothermal aging on the indentation creep behaviors of PMMA
title_sort	experimental study on the effects of hygrothermal aging on the indentation creep behaviors of pmma
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/807dc46d5b5146cca97802ed4b78bf6b
work_keys_str_mv	AT linlv experimentalstudyontheeffectsofhygrothermalagingontheindentationcreepbehaviorsofpmma AT huilin experimentalstudyontheeffectsofhygrothermalagingontheindentationcreepbehaviorsofpmma AT taojin experimentalstudyontheeffectsofhygrothermalagingontheindentationcreepbehaviorsofpmma
_version_	1718415987537084416

Experimental study on the effects of hygrothermal aging on the indentation creep behaviors of PMMA

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