Investigation on the influences of hygrothermal aging on the indentation size effects and micro-indentation measurements of PMMA. Part II: Analysis and modeling

The nanoindentation results of Polymethyl Methacrylate (PMMA) after hygrothermal aging under different indentation strain rates are analyzed. The influences of hygrothermal aging on its indentation size effects (ISE) and microindentation measurements are discussed. The theory of shear transformation...

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Autores principales:	Hui Lin, Lin Lv, Tao Jin, Qing Yin
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Pressure-sensitive polymer Indentation size effects Strength differential effects Shear transformation mediated plasticity Hygrothermal aging Polymers and polymer manufacture TP1080-1185
Acceso en línea:	https://doaj.org/article/8a85ca70860f46779479277630bda54b
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spelling	oai:doaj.org-article:8a85ca70860f46779479277630bda54b2021-11-24T04:24:38ZInvestigation on the influences of hygrothermal aging on the indentation size effects and micro-indentation measurements of PMMA. Part II: Analysis and modeling0142-941810.1016/j.polymertesting.2020.106938https://doaj.org/article/8a85ca70860f46779479277630bda54b2021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S014294182032167Xhttps://doaj.org/toc/0142-9418The nanoindentation results of Polymethyl Methacrylate (PMMA) after hygrothermal aging under different indentation strain rates are analyzed. The influences of hygrothermal aging on its indentation size effects (ISE) and microindentation measurements are discussed. The theory of shear transformation plasticity is utilized to analyze the ISE of PMMA after hygrothermal aging. The shear transformation zone (STz) sizes of PMMA under different conditions have been calculated and can be continuously described by aging time and strain rate. The characteristic deep, which represents the vanishment of ISE, is obtained and exhibits increases with strain rate and aging time. The objective measurements (i.e., elastic modulus and hardness) that represent the practical properties of the aged PMMA can be calculated: elastic modulus and hardness decrease with aging time. The effects of aging on the mechanical properties weaken with the increase with aging time, which results from the variation in the micro-mechanism. The prediction model can be constructed to explain the ISE of PMMA after hygrothermal aging through relating χ with aging time and strain rate. The proposed model agrees well with the experimental results.Hui LinLin LvTao JinQing YinElsevierarticlePressure-sensitive polymerIndentation size effectsStrength differential effectsShear transformation mediated plasticityHygrothermal agingPolymers and polymer manufactureTP1080-1185ENPolymer Testing, Vol 93, Iss , Pp 106938- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Pressure-sensitive polymer Indentation size effects Strength differential effects Shear transformation mediated plasticity Hygrothermal aging Polymers and polymer manufacture TP1080-1185
spellingShingle	Pressure-sensitive polymer Indentation size effects Strength differential effects Shear transformation mediated plasticity Hygrothermal aging Polymers and polymer manufacture TP1080-1185 Hui Lin Lin Lv Tao Jin Qing Yin Investigation on the influences of hygrothermal aging on the indentation size effects and micro-indentation measurements of PMMA. Part II: Analysis and modeling
description	The nanoindentation results of Polymethyl Methacrylate (PMMA) after hygrothermal aging under different indentation strain rates are analyzed. The influences of hygrothermal aging on its indentation size effects (ISE) and microindentation measurements are discussed. The theory of shear transformation plasticity is utilized to analyze the ISE of PMMA after hygrothermal aging. The shear transformation zone (STz) sizes of PMMA under different conditions have been calculated and can be continuously described by aging time and strain rate. The characteristic deep, which represents the vanishment of ISE, is obtained and exhibits increases with strain rate and aging time. The objective measurements (i.e., elastic modulus and hardness) that represent the practical properties of the aged PMMA can be calculated: elastic modulus and hardness decrease with aging time. The effects of aging on the mechanical properties weaken with the increase with aging time, which results from the variation in the micro-mechanism. The prediction model can be constructed to explain the ISE of PMMA after hygrothermal aging through relating χ with aging time and strain rate. The proposed model agrees well with the experimental results.
format	article
author	Hui Lin Lin Lv Tao Jin Qing Yin
author_facet	Hui Lin Lin Lv Tao Jin Qing Yin
author_sort	Hui Lin
title	Investigation on the influences of hygrothermal aging on the indentation size effects and micro-indentation measurements of PMMA. Part II: Analysis and modeling
title_short	Investigation on the influences of hygrothermal aging on the indentation size effects and micro-indentation measurements of PMMA. Part II: Analysis and modeling
title_full	Investigation on the influences of hygrothermal aging on the indentation size effects and micro-indentation measurements of PMMA. Part II: Analysis and modeling
title_fullStr	Investigation on the influences of hygrothermal aging on the indentation size effects and micro-indentation measurements of PMMA. Part II: Analysis and modeling
title_full_unstemmed	Investigation on the influences of hygrothermal aging on the indentation size effects and micro-indentation measurements of PMMA. Part II: Analysis and modeling
title_sort	investigation on the influences of hygrothermal aging on the indentation size effects and micro-indentation measurements of pmma. part ii: analysis and modeling
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/8a85ca70860f46779479277630bda54b
work_keys_str_mv	AT huilin investigationontheinfluencesofhygrothermalagingontheindentationsizeeffectsandmicroindentationmeasurementsofpmmapartiianalysisandmodeling AT linlv investigationontheinfluencesofhygrothermalagingontheindentationsizeeffectsandmicroindentationmeasurementsofpmmapartiianalysisandmodeling AT taojin investigationontheinfluencesofhygrothermalagingontheindentationsizeeffectsandmicroindentationmeasurementsofpmmapartiianalysisandmodeling AT qingyin investigationontheinfluencesofhygrothermalagingontheindentationsizeeffectsandmicroindentationmeasurementsofpmmapartiianalysisandmodeling
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Investigation on the influences of hygrothermal aging on the indentation size effects and micro-indentation measurements of PMMA. Part II: Analysis and modeling

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