Injection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients

Thermoplastic resins, which are lighter than metals and ceramics, have many features such as excellent processability. They are used in widely various fields for daily necessities and for transportation equipment. Even for the same material, the elastic properties of the thermoplastic resin can vary...

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Autores principales:	Tetsuo TAKAYAMA, Yuki MOTOYAMA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2021
Materias:	thermoplastics injection molding elastic modulus poisson’s ratio three-point bending tests Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/06b3e48cb4744638b2553ba73f6331e6
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spelling	oai:doaj.org-article:06b3e48cb4744638b2553ba73f6331e62021-11-29T06:05:55ZInjection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients2187-974510.1299/mej.20-00414https://doaj.org/article/06b3e48cb4744638b2553ba73f6331e62021-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/2/8_20-00414/_pdf/-char/enhttps://doaj.org/toc/2187-9745Thermoplastic resins, which are lighter than metals and ceramics, have many features such as excellent processability. They are used in widely various fields for daily necessities and for transportation equipment. Even for the same material, the elastic properties of the thermoplastic resin can vary depending on the molecular weight, molding temperature and conditions. Therefore, the elastic properties required for structural analysis must be evaluated each time. After this study derived a formula for yield initiation stress of injection-molded thermoplastics, the formula was applied for a method of obtaining the longitudinal elastic modulus and Poisson's ratio from results of a three-point bending test. From actual examination using polypropylene (PP) and polystyrene (PS), the calculated longitudinal elastic modulus and Poisson's ratio showed good agreement with literature values. Results clarified that these values depend on the injection molding temperature. Furthermore, the bulk modulus and shear modulus were obtained from the longitudinal modulus and Poisson's ratio. Their injection molding temperature dependences were investigated. The shear modulus showed the same tendency as that of the longitudinal elastic modulus, but results indicated the dependence of bulk modulus as small in PP: bulk modulus of PS increased with increasing injection molding temperature.Tetsuo TAKAYAMAYuki MOTOYAMAThe Japan Society of Mechanical Engineersarticlethermoplasticsinjection moldingelastic moduluspoisson’s ratiothree-point bending testsMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 2, Pp 20-00414-20-00414 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	thermoplastics injection molding elastic modulus poisson’s ratio three-point bending tests Mechanical engineering and machinery TJ1-1570
spellingShingle	thermoplastics injection molding elastic modulus poisson’s ratio three-point bending tests Mechanical engineering and machinery TJ1-1570 Tetsuo TAKAYAMA Yuki MOTOYAMA Injection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients
description	Thermoplastic resins, which are lighter than metals and ceramics, have many features such as excellent processability. They are used in widely various fields for daily necessities and for transportation equipment. Even for the same material, the elastic properties of the thermoplastic resin can vary depending on the molecular weight, molding temperature and conditions. Therefore, the elastic properties required for structural analysis must be evaluated each time. After this study derived a formula for yield initiation stress of injection-molded thermoplastics, the formula was applied for a method of obtaining the longitudinal elastic modulus and Poisson's ratio from results of a three-point bending test. From actual examination using polypropylene (PP) and polystyrene (PS), the calculated longitudinal elastic modulus and Poisson's ratio showed good agreement with literature values. Results clarified that these values depend on the injection molding temperature. Furthermore, the bulk modulus and shear modulus were obtained from the longitudinal modulus and Poisson's ratio. Their injection molding temperature dependences were investigated. The shear modulus showed the same tendency as that of the longitudinal elastic modulus, but results indicated the dependence of bulk modulus as small in PP: bulk modulus of PS increased with increasing injection molding temperature.
format	article
author	Tetsuo TAKAYAMA Yuki MOTOYAMA
author_facet	Tetsuo TAKAYAMA Yuki MOTOYAMA
author_sort	Tetsuo TAKAYAMA
title	Injection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients
title_short	Injection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients
title_full	Injection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients
title_fullStr	Injection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients
title_full_unstemmed	Injection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients
title_sort	injection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients
publisher	The Japan Society of Mechanical Engineers
publishDate	2021
url	https://doaj.org/article/06b3e48cb4744638b2553ba73f6331e6
work_keys_str_mv	AT tetsuotakayama injectionmoldingtemperaturedependenceofelasticcoefficientsobtainedusingthreepointbendingteststoascertainthermoplasticpolymercoefficients AT yukimotoyama injectionmoldingtemperaturedependenceofelasticcoefficientsobtainedusingthreepointbendingteststoascertainthermoplasticpolymercoefficients
_version_	1718407566718926848

Injection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients

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