Mechanical anisotropy of PAN-based and pitch-based carbon fibers

With the expansion of use of carbon fiber reinforced plastics (CFRPs), it becomes important to obtain precise knowledge of elastic properties carbon fibers in radial direction as well as axial direction. Although the elastic property in radial direction of polyacrylonitrile (PAN)-based carbon fibers...

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Autores principales:	Keiichi SHIRASU, Chiemi NAGAI, Kimiyoshi NAITO
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	carbon fibers nanoindentation indentation modulus anisotropy Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/8d16400c91b441a99ef800a88a5317bf
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spelling	oai:doaj.org-article:8d16400c91b441a99ef800a88a5317bf2021-11-29T05:59:26ZMechanical anisotropy of PAN-based and pitch-based carbon fibers2187-974510.1299/mej.19-00599https://doaj.org/article/8d16400c91b441a99ef800a88a5317bf2020-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/4/7_19-00599/_pdf/-char/enhttps://doaj.org/toc/2187-9745With the expansion of use of carbon fiber reinforced plastics (CFRPs), it becomes important to obtain precise knowledge of elastic properties carbon fibers in radial direction as well as axial direction. Although the elastic property in radial direction of polyacrylonitrile (PAN)-based carbon fibers have been investigated using ultrasound scatter measurements, compression tests of single fibers and nanoindentation, there is no experimental evaluation for the pitch-based carbon fibers which possess higher crystallinity and tensile modulus than PAN-based carbon fibers. Here, we investigate the mechanical anisotropy of PAN- and pitch-based carbon fibers by the nanoindentation technique. Nanoindentation tests are carried out on longitudinal (0°), 45° and transversal (90°) cross sections of carbon fibers by a Hysitron TriboScope (Minneapolis, MN) using a diamond conical indenter with a nominal tip radius of 10 μm. We demonstrate that the indentation modulus of both carbon fibers decreases with a decreasing orientation angle from axial to radial direction, but this tendency is more significant in the pitch-based carbon fibers. Supposing that the indentation modulus in the radial direction is same as the transverse elastic modulus, the anisotropy of elastic modulus (Ef/ET) of the pitch-based carbon fibers is calculated to be 165 which is approximately 15 times as high as that of PAN-based carbon fiber (Ef/ET = 11). This result suggests that the pitch-based carbon fiber possesses a large mechanical anisotropy. The higher mechanical anisotropy observed in the pitch-based carbon fiber is mainly due to the existence of the parallel arrangement carbon crystallite microtexture with high crystallinity in the axial direction.Keiichi SHIRASUChiemi NAGAIKimiyoshi NAITOThe Japan Society of Mechanical Engineersarticlecarbon fibersnanoindentationindentation modulusanisotropyMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 4, Pp 19-00599-19-00599 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	carbon fibers nanoindentation indentation modulus anisotropy Mechanical engineering and machinery TJ1-1570
spellingShingle	carbon fibers nanoindentation indentation modulus anisotropy Mechanical engineering and machinery TJ1-1570 Keiichi SHIRASU Chiemi NAGAI Kimiyoshi NAITO Mechanical anisotropy of PAN-based and pitch-based carbon fibers
description	With the expansion of use of carbon fiber reinforced plastics (CFRPs), it becomes important to obtain precise knowledge of elastic properties carbon fibers in radial direction as well as axial direction. Although the elastic property in radial direction of polyacrylonitrile (PAN)-based carbon fibers have been investigated using ultrasound scatter measurements, compression tests of single fibers and nanoindentation, there is no experimental evaluation for the pitch-based carbon fibers which possess higher crystallinity and tensile modulus than PAN-based carbon fibers. Here, we investigate the mechanical anisotropy of PAN- and pitch-based carbon fibers by the nanoindentation technique. Nanoindentation tests are carried out on longitudinal (0°), 45° and transversal (90°) cross sections of carbon fibers by a Hysitron TriboScope (Minneapolis, MN) using a diamond conical indenter with a nominal tip radius of 10 μm. We demonstrate that the indentation modulus of both carbon fibers decreases with a decreasing orientation angle from axial to radial direction, but this tendency is more significant in the pitch-based carbon fibers. Supposing that the indentation modulus in the radial direction is same as the transverse elastic modulus, the anisotropy of elastic modulus (Ef/ET) of the pitch-based carbon fibers is calculated to be 165 which is approximately 15 times as high as that of PAN-based carbon fiber (Ef/ET = 11). This result suggests that the pitch-based carbon fiber possesses a large mechanical anisotropy. The higher mechanical anisotropy observed in the pitch-based carbon fiber is mainly due to the existence of the parallel arrangement carbon crystallite microtexture with high crystallinity in the axial direction.
format	article
author	Keiichi SHIRASU Chiemi NAGAI Kimiyoshi NAITO
author_facet	Keiichi SHIRASU Chiemi NAGAI Kimiyoshi NAITO
author_sort	Keiichi SHIRASU
title	Mechanical anisotropy of PAN-based and pitch-based carbon fibers
title_short	Mechanical anisotropy of PAN-based and pitch-based carbon fibers
title_full	Mechanical anisotropy of PAN-based and pitch-based carbon fibers
title_fullStr	Mechanical anisotropy of PAN-based and pitch-based carbon fibers
title_full_unstemmed	Mechanical anisotropy of PAN-based and pitch-based carbon fibers
title_sort	mechanical anisotropy of pan-based and pitch-based carbon fibers
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/8d16400c91b441a99ef800a88a5317bf
work_keys_str_mv	AT keiichishirasu mechanicalanisotropyofpanbasedandpitchbasedcarbonfibers AT chieminagai mechanicalanisotropyofpanbasedandpitchbasedcarbonfibers AT kimiyoshinaito mechanicalanisotropyofpanbasedandpitchbasedcarbonfibers
_version_	1718407599148236800

Mechanical anisotropy of PAN-based and pitch-based carbon fibers

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