Numerical study for tensile strength prediction of unidirectional carbon fiber-reinforced composite considering fiber surface stress concentration

The accurate tensile strength prediction of unidirectional carbon fiber-reinforced plastic composites (UD composites) requires approximate determination of the stress concentration on surviving fibers around a fiber break point. Here the stress concentrated on the intact fiber surface was determined...

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Autores principales:	Go YAMAMOTO, Tomonaga OKABE
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2019
Materias:	carbon fiber polymer-matrix composite (pmc) fragmentation strength stress concentration Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/d9b2d228ccda4391926b988d3a4a79b5
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spelling	oai:doaj.org-article:d9b2d228ccda4391926b988d3a4a79b52021-11-29T05:43:34ZNumerical study for tensile strength prediction of unidirectional carbon fiber-reinforced composite considering fiber surface stress concentration2187-974510.1299/mej.19-00020https://doaj.org/article/d9b2d228ccda4391926b988d3a4a79b52019-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/6/3/6_19-00020/_pdf/-char/enhttps://doaj.org/toc/2187-9745The accurate tensile strength prediction of unidirectional carbon fiber-reinforced plastic composites (UD composites) requires approximate determination of the stress concentration on surviving fibers around a fiber break point. Here the stress concentrated on the intact fiber surface was determined by implementing double-fiber fragmentation tests in combination with a spring element model (SEM) simulation. The double-fiber fragmentation composites and the UD composites were elaborated with a T1100G-type carbon fiber and epoxy material, and tested to validate the proposed prediction method. The size scaling results, implementing a bimodal Weibull distribution for the statistical distribution of fiber strength, coupled with the results of the SEM simulation, designed to take into account the surface stress concentration, were reasonably consistent with the experimental data on the tensile strengths of the UD composites. Then, the proposed strength prediction procedure was applied to investigate the effects of the bimodal Weibull scale and shape parameters on the tensile strength of the UD composites. It was revealed that the degree of stress concentrated on the surface of fibers can be changed by modifying the bimodal Weibull shape and scale parameters. However, the carbon fiber with an improved scale parameters of 20% displayed enhancement to the composite strength by factor of ~1.07, and with an improved shape parameters of 20% showed enhancement by factor of ~1.04, indicating that the degree of enhancement in the tensile strength of the UD composite was limited.Go YAMAMOTOTomonaga OKABEThe Japan Society of Mechanical Engineersarticlecarbon fiberpolymer-matrix composite (pmc)fragmentationstrengthstress concentrationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 6, Iss 3, Pp 19-00020-19-00020 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	carbon fiber polymer-matrix composite (pmc) fragmentation strength stress concentration Mechanical engineering and machinery TJ1-1570
spellingShingle	carbon fiber polymer-matrix composite (pmc) fragmentation strength stress concentration Mechanical engineering and machinery TJ1-1570 Go YAMAMOTO Tomonaga OKABE Numerical study for tensile strength prediction of unidirectional carbon fiber-reinforced composite considering fiber surface stress concentration
description	The accurate tensile strength prediction of unidirectional carbon fiber-reinforced plastic composites (UD composites) requires approximate determination of the stress concentration on surviving fibers around a fiber break point. Here the stress concentrated on the intact fiber surface was determined by implementing double-fiber fragmentation tests in combination with a spring element model (SEM) simulation. The double-fiber fragmentation composites and the UD composites were elaborated with a T1100G-type carbon fiber and epoxy material, and tested to validate the proposed prediction method. The size scaling results, implementing a bimodal Weibull distribution for the statistical distribution of fiber strength, coupled with the results of the SEM simulation, designed to take into account the surface stress concentration, were reasonably consistent with the experimental data on the tensile strengths of the UD composites. Then, the proposed strength prediction procedure was applied to investigate the effects of the bimodal Weibull scale and shape parameters on the tensile strength of the UD composites. It was revealed that the degree of stress concentrated on the surface of fibers can be changed by modifying the bimodal Weibull shape and scale parameters. However, the carbon fiber with an improved scale parameters of 20% displayed enhancement to the composite strength by factor of ~1.07, and with an improved shape parameters of 20% showed enhancement by factor of ~1.04, indicating that the degree of enhancement in the tensile strength of the UD composite was limited.
format	article
author	Go YAMAMOTO Tomonaga OKABE
author_facet	Go YAMAMOTO Tomonaga OKABE
author_sort	Go YAMAMOTO
title	Numerical study for tensile strength prediction of unidirectional carbon fiber-reinforced composite considering fiber surface stress concentration
title_short	Numerical study for tensile strength prediction of unidirectional carbon fiber-reinforced composite considering fiber surface stress concentration
title_full	Numerical study for tensile strength prediction of unidirectional carbon fiber-reinforced composite considering fiber surface stress concentration
title_fullStr	Numerical study for tensile strength prediction of unidirectional carbon fiber-reinforced composite considering fiber surface stress concentration
title_full_unstemmed	Numerical study for tensile strength prediction of unidirectional carbon fiber-reinforced composite considering fiber surface stress concentration
title_sort	numerical study for tensile strength prediction of unidirectional carbon fiber-reinforced composite considering fiber surface stress concentration
publisher	The Japan Society of Mechanical Engineers
publishDate	2019
url	https://doaj.org/article/d9b2d228ccda4391926b988d3a4a79b5
work_keys_str_mv	AT goyamamoto numericalstudyfortensilestrengthpredictionofunidirectionalcarbonfiberreinforcedcompositeconsideringfibersurfacestressconcentration AT tomonagaokabe numericalstudyfortensilestrengthpredictionofunidirectionalcarbonfiberreinforcedcompositeconsideringfibersurfacestressconcentration
_version_	1718407676283584512

Numerical study for tensile strength prediction of unidirectional carbon fiber-reinforced composite considering fiber surface stress concentration

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