Analysis of orientation behavior in extruded tricalcium phosphate/poly(lactic acid) composite billet using finite element method and chain network model

The poly(lactic acid) (PLA)-tricalcium phosphate (TCP) composite attracts much attention as a material for a bone fixation device because both have bioabsorbability. However, the applications of the composite bone fixation device are limited to low-loaded regions because of lower strengths. In this...

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Autores principales:	Masato SAKAGUCHI, Satoshi KOBAYASHI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2021
Materias:	molecular orientation drawing poly(lactic acid) tricalcium phosphate extrusion finite element method Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/b8b6de7e115042aca5335eead194ba1b
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spelling	oai:doaj.org-article:b8b6de7e115042aca5335eead194ba1b2021-11-09T00:01:15ZAnalysis of orientation behavior in extruded tricalcium phosphate/poly(lactic acid) composite billet using finite element method and chain network model2187-974510.1299/mej.21-00190https://doaj.org/article/b8b6de7e115042aca5335eead194ba1b2021-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/5/8_21-00190/_pdf/-char/enhttps://doaj.org/toc/2187-9745The poly(lactic acid) (PLA)-tricalcium phosphate (TCP) composite attracts much attention as a material for a bone fixation device because both have bioabsorbability. However, the applications of the composite bone fixation device are limited to low-loaded regions because of lower strengths. In this study, PLA and TCP/PLA composite cylindrical billets were extruded to improve their strengths, with the aim of clarifying the molecular orientation behavior of the PLA and TCP/PLA billets in extrusion. First, the effect of the orientation behavior in the PLA billets on the extrusion ratio (ER) was calculated. Next, the TCP/PLA billets were analyzed. The molecular orientation obtained by extrusion was investigated by a combination of the finite element method and the chain network model. Consequently, the orientation function of the extruded billet was found to increase with the ER. Furthermore, the orientation function of the TCP/PLA billet was higher than that of the PLA billet, which may be due to the change in the yield stress and n value of the billet by TCP addition. The orientation distribution in the radius direction of the extruded PLA billet showed that the orientation function at the surface region was larger than that at the center region. This orientation distribution might be because the movement distance of the surface region during extrusion was longer than that in the center region. The surface region in the billet was drawn by the difference of those movement distances and might be orientated. The workability of the PLA and TCP/PLA billets was also investigated using pressure during extrusion. The results showed that the extrusion pressure increased with the TCP content and ER. Therefore, extrusion workability decreased with the TCP content and the ER.Masato SAKAGUCHISatoshi KOBAYASHIThe Japan Society of Mechanical Engineersarticlemolecular orientationdrawingpoly(lactic acid)tricalcium phosphateextrusionfinite element methodMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 5, Pp 21-00190-21-00190 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	molecular orientation drawing poly(lactic acid) tricalcium phosphate extrusion finite element method Mechanical engineering and machinery TJ1-1570
spellingShingle	molecular orientation drawing poly(lactic acid) tricalcium phosphate extrusion finite element method Mechanical engineering and machinery TJ1-1570 Masato SAKAGUCHI Satoshi KOBAYASHI Analysis of orientation behavior in extruded tricalcium phosphate/poly(lactic acid) composite billet using finite element method and chain network model
description	The poly(lactic acid) (PLA)-tricalcium phosphate (TCP) composite attracts much attention as a material for a bone fixation device because both have bioabsorbability. However, the applications of the composite bone fixation device are limited to low-loaded regions because of lower strengths. In this study, PLA and TCP/PLA composite cylindrical billets were extruded to improve their strengths, with the aim of clarifying the molecular orientation behavior of the PLA and TCP/PLA billets in extrusion. First, the effect of the orientation behavior in the PLA billets on the extrusion ratio (ER) was calculated. Next, the TCP/PLA billets were analyzed. The molecular orientation obtained by extrusion was investigated by a combination of the finite element method and the chain network model. Consequently, the orientation function of the extruded billet was found to increase with the ER. Furthermore, the orientation function of the TCP/PLA billet was higher than that of the PLA billet, which may be due to the change in the yield stress and n value of the billet by TCP addition. The orientation distribution in the radius direction of the extruded PLA billet showed that the orientation function at the surface region was larger than that at the center region. This orientation distribution might be because the movement distance of the surface region during extrusion was longer than that in the center region. The surface region in the billet was drawn by the difference of those movement distances and might be orientated. The workability of the PLA and TCP/PLA billets was also investigated using pressure during extrusion. The results showed that the extrusion pressure increased with the TCP content and ER. Therefore, extrusion workability decreased with the TCP content and the ER.
format	article
author	Masato SAKAGUCHI Satoshi KOBAYASHI
author_facet	Masato SAKAGUCHI Satoshi KOBAYASHI
author_sort	Masato SAKAGUCHI
title	Analysis of orientation behavior in extruded tricalcium phosphate/poly(lactic acid) composite billet using finite element method and chain network model
title_short	Analysis of orientation behavior in extruded tricalcium phosphate/poly(lactic acid) composite billet using finite element method and chain network model
title_full	Analysis of orientation behavior in extruded tricalcium phosphate/poly(lactic acid) composite billet using finite element method and chain network model
title_fullStr	Analysis of orientation behavior in extruded tricalcium phosphate/poly(lactic acid) composite billet using finite element method and chain network model
title_full_unstemmed	Analysis of orientation behavior in extruded tricalcium phosphate/poly(lactic acid) composite billet using finite element method and chain network model
title_sort	analysis of orientation behavior in extruded tricalcium phosphate/poly(lactic acid) composite billet using finite element method and chain network model
publisher	The Japan Society of Mechanical Engineers
publishDate	2021
url	https://doaj.org/article/b8b6de7e115042aca5335eead194ba1b
work_keys_str_mv	AT masatosakaguchi analysisoforientationbehaviorinextrudedtricalciumphosphatepolylacticacidcompositebilletusingfiniteelementmethodandchainnetworkmodel AT satoshikobayashi analysisoforientationbehaviorinextrudedtricalciumphosphatepolylacticacidcompositebilletusingfiniteelementmethodandchainnetworkmodel
_version_	1718441417802514432

Analysis of orientation behavior in extruded tricalcium phosphate/poly(lactic acid) composite billet using finite element method and chain network model

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