Rheological Study of Solidified Traction Oils under High Pressure by Observation of Deformed Microspheres

The rheological properties of solidified traction oils used in continuously variable transmissions (CVTs) under pressure were evaluated by observing large plastic deformation of metal microspheres (φ about 0.07 mm), occurring due to non-hydrostatic pressurization in these oils using a diamon...

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Autores principales:	Yuichi Nakamura, Sho Ito, Masahito Matsui
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2008
Materias:	lubricant high pressure solidification traction oil shear stress limiting shear stress Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/d4200dd48aa14333bd055a0dbd88e7e5
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spelling	oai:doaj.org-article:d4200dd48aa14333bd055a0dbd88e7e52021-11-05T09:29:17ZRheological Study of Solidified Traction Oils under High Pressure by Observation of Deformed Microspheres1881-219810.2474/trol.3.36https://doaj.org/article/d4200dd48aa14333bd055a0dbd88e7e52008-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/3/2/3_2_36/_pdf/-char/enhttps://doaj.org/toc/1881-2198The rheological properties of solidified traction oils used in continuously variable transmissions (CVTs) under pressure were evaluated by observing large plastic deformation of metal microspheres (φ about 0.07 mm), occurring due to non-hydrostatic pressurization in these oils using a diamond-anvil pressure cell. The solidification pressure values obtained by observing aluminum sphere deformation were almost equal to those extrapolated from high-pressure viscosity; thus, aluminum sphere deformation experiments are effective for evaluating solidification pressure. Shear stresses of the solidified oils could be estimated up to 5 GPa from the deformed Cu spheres based on several assumptions. The stresses were almost equal to the mean shear stress obtained from a traction test between 1.0 GPa and 1.7 GPa and were below it for pressures above 1.7 GPa. The stress values varied little among different oils.Yuichi NakamuraSho ItoMasahito MatsuiJapanese Society of Tribologistsarticlelubricanthigh pressuresolidificationtraction oilshear stresslimiting shear stressPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 3, Iss 2, Pp 36-39 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	lubricant high pressure solidification traction oil shear stress limiting shear stress Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	lubricant high pressure solidification traction oil shear stress limiting shear stress Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Yuichi Nakamura Sho Ito Masahito Matsui Rheological Study of Solidified Traction Oils under High Pressure by Observation of Deformed Microspheres
description	The rheological properties of solidified traction oils used in continuously variable transmissions (CVTs) under pressure were evaluated by observing large plastic deformation of metal microspheres (φ about 0.07 mm), occurring due to non-hydrostatic pressurization in these oils using a diamond-anvil pressure cell. The solidification pressure values obtained by observing aluminum sphere deformation were almost equal to those extrapolated from high-pressure viscosity; thus, aluminum sphere deformation experiments are effective for evaluating solidification pressure. Shear stresses of the solidified oils could be estimated up to 5 GPa from the deformed Cu spheres based on several assumptions. The stresses were almost equal to the mean shear stress obtained from a traction test between 1.0 GPa and 1.7 GPa and were below it for pressures above 1.7 GPa. The stress values varied little among different oils.
format	article
author	Yuichi Nakamura Sho Ito Masahito Matsui
author_facet	Yuichi Nakamura Sho Ito Masahito Matsui
author_sort	Yuichi Nakamura
title	Rheological Study of Solidified Traction Oils under High Pressure by Observation of Deformed Microspheres
title_short	Rheological Study of Solidified Traction Oils under High Pressure by Observation of Deformed Microspheres
title_full	Rheological Study of Solidified Traction Oils under High Pressure by Observation of Deformed Microspheres
title_fullStr	Rheological Study of Solidified Traction Oils under High Pressure by Observation of Deformed Microspheres
title_full_unstemmed	Rheological Study of Solidified Traction Oils under High Pressure by Observation of Deformed Microspheres
title_sort	rheological study of solidified traction oils under high pressure by observation of deformed microspheres
publisher	Japanese Society of Tribologists
publishDate	2008
url	https://doaj.org/article/d4200dd48aa14333bd055a0dbd88e7e5
work_keys_str_mv	AT yuichinakamura rheologicalstudyofsolidifiedtractionoilsunderhighpressurebyobservationofdeformedmicrospheres AT shoito rheologicalstudyofsolidifiedtractionoilsunderhighpressurebyobservationofdeformedmicrospheres AT masahitomatsui rheologicalstudyofsolidifiedtractionoilsunderhighpressurebyobservationofdeformedmicrospheres
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Rheological Study of Solidified Traction Oils under High Pressure by Observation of Deformed Microspheres

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