Analysis of orientation behavior in poly(lactic acid) billets during extrusion using a finite element method and chain network model

Poly(lactic acid) (PLA) has attracted much attention for use in bone fixation devices, which are used for fracture treatment, because it degrades to nontoxic lactic acid through nonenzymatic hydrolytic degradation. However, the application of such device is limited to relatively low-load regions, be...

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Autores principales:	Masato SAKAGUCHI, Yoshiki MITUOKA, Satoshi KOBAYASHI, Shinji OGIHARA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2019
Materias:	poly(lactic acid) higher order structure molecular orientation finite element method chain network model Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/c58ebdacf1764f6abf92bb2807a81f9a
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spelling	oai:doaj.org-article:c58ebdacf1764f6abf92bb2807a81f9a2021-11-29T05:47:04ZAnalysis of orientation behavior in poly(lactic acid) billets during extrusion using a finite element method and chain network model2187-974510.1299/mej.19-00346https://doaj.org/article/c58ebdacf1764f6abf92bb2807a81f9a2019-09-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/6/5/6_19-00346/_pdf/-char/enhttps://doaj.org/toc/2187-9745Poly(lactic acid) (PLA) has attracted much attention for use in bone fixation devices, which are used for fracture treatment, because it degrades to nontoxic lactic acid through nonenzymatic hydrolytic degradation. However, the application of such device is limited to relatively low-load regions, because mechanical properties of PLA is poor than that of metal materials. The process of drawing PLA fibers has attracted much attention as an approach for improving the mechanical properties of PLA bone fixation devices. The mechanical properties and molecular orientation of drawn PLA fibers and films have been investigated. However, the optimization of drawing conditions in bulk processes in relation to bone fixation devices is difficult because a large number of potential drawing conditions exist. The purpose of this study was to analytically clarify molecular orientation behavior in drawn PLA billets. The molecular orientation obtained by extrusion in PLA billets was investigated using a combination of the finite element method (FEM) and a chain network model. As a result of the FEM, first principal plastic strain was generated, mainly in the tapered components during extrusion; this strain was in the axial direction of the rod. Radius strain distributions showed that strain in the center region was almost uniform, whereas strain peaked near the surface. The orientation function increased with extrusion ratio (ER), and the peak orientation function in the surface region increased with taper angle. Thus, the magnitude and distribution of the orientation function in extruded PLA billets may be controllable by ER and taper angle, respectively.Masato SAKAGUCHIYoshiki MITUOKASatoshi KOBAYASHIShinji OGIHARAThe Japan Society of Mechanical Engineersarticlepoly(lactic acid)higher order structuremolecular orientationfinite element methodchain network modelMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 6, Iss 5, Pp 19-00346-19-00346 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	poly(lactic acid) higher order structure molecular orientation finite element method chain network model Mechanical engineering and machinery TJ1-1570
spellingShingle	poly(lactic acid) higher order structure molecular orientation finite element method chain network model Mechanical engineering and machinery TJ1-1570 Masato SAKAGUCHI Yoshiki MITUOKA Satoshi KOBAYASHI Shinji OGIHARA Analysis of orientation behavior in poly(lactic acid) billets during extrusion using a finite element method and chain network model
description	Poly(lactic acid) (PLA) has attracted much attention for use in bone fixation devices, which are used for fracture treatment, because it degrades to nontoxic lactic acid through nonenzymatic hydrolytic degradation. However, the application of such device is limited to relatively low-load regions, because mechanical properties of PLA is poor than that of metal materials. The process of drawing PLA fibers has attracted much attention as an approach for improving the mechanical properties of PLA bone fixation devices. The mechanical properties and molecular orientation of drawn PLA fibers and films have been investigated. However, the optimization of drawing conditions in bulk processes in relation to bone fixation devices is difficult because a large number of potential drawing conditions exist. The purpose of this study was to analytically clarify molecular orientation behavior in drawn PLA billets. The molecular orientation obtained by extrusion in PLA billets was investigated using a combination of the finite element method (FEM) and a chain network model. As a result of the FEM, first principal plastic strain was generated, mainly in the tapered components during extrusion; this strain was in the axial direction of the rod. Radius strain distributions showed that strain in the center region was almost uniform, whereas strain peaked near the surface. The orientation function increased with extrusion ratio (ER), and the peak orientation function in the surface region increased with taper angle. Thus, the magnitude and distribution of the orientation function in extruded PLA billets may be controllable by ER and taper angle, respectively.
format	article
author	Masato SAKAGUCHI Yoshiki MITUOKA Satoshi KOBAYASHI Shinji OGIHARA
author_facet	Masato SAKAGUCHI Yoshiki MITUOKA Satoshi KOBAYASHI Shinji OGIHARA
author_sort	Masato SAKAGUCHI
title	Analysis of orientation behavior in poly(lactic acid) billets during extrusion using a finite element method and chain network model
title_short	Analysis of orientation behavior in poly(lactic acid) billets during extrusion using a finite element method and chain network model
title_full	Analysis of orientation behavior in poly(lactic acid) billets during extrusion using a finite element method and chain network model
title_fullStr	Analysis of orientation behavior in poly(lactic acid) billets during extrusion using a finite element method and chain network model
title_full_unstemmed	Analysis of orientation behavior in poly(lactic acid) billets during extrusion using a finite element method and chain network model
title_sort	analysis of orientation behavior in poly(lactic acid) billets during extrusion using a finite element method and chain network model
publisher	The Japan Society of Mechanical Engineers
publishDate	2019
url	https://doaj.org/article/c58ebdacf1764f6abf92bb2807a81f9a
work_keys_str_mv	AT masatosakaguchi analysisoforientationbehaviorinpolylacticacidbilletsduringextrusionusingafiniteelementmethodandchainnetworkmodel AT yoshikimituoka analysisoforientationbehaviorinpolylacticacidbilletsduringextrusionusingafiniteelementmethodandchainnetworkmodel AT satoshikobayashi analysisoforientationbehaviorinpolylacticacidbilletsduringextrusionusingafiniteelementmethodandchainnetworkmodel AT shinjiogihara analysisoforientationbehaviorinpolylacticacidbilletsduringextrusionusingafiniteelementmethodandchainnetworkmodel
_version_	1718407611263483904

Analysis of orientation behavior in poly(lactic acid) billets during extrusion using a finite element method and chain network model

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