Effects of lubricant viscoelasticity on film thickness in elastohydrodynamic line contacts during start-up

By means of numerical simulation the elastohydrodynamic lubricating film formation during start-up of motion of a line contact from rest is studied. The transition from solid contact to lubricated contact is of importance in investigating the start-up process and its effects on bearing performance....
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Usov, P. P [verfasserIn]

Format:	Artikel
Sprache:	Englisch

Erschienen:	2016

Schlagwörter:	Velocity Simulation Viscoelasticity Elastohydrodynamic lubrication

Übergeordnetes Werk:	Enthalten in: Proceedings of the Institution of Mechanical Engineers / J - London [u.a.] : Inst., 1994, 230(2016), 7, Seite 769-782
Übergeordnetes Werk:	volume:230 ; year:2016 ; number:7 ; pages:769-782

Links:	Volltext Link aufrufen

DOI / URN:	10.1177/1350650115618924

Katalog-ID:	OLC1979466718

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520			\|a By means of numerical simulation the elastohydrodynamic lubricating film formation during start-up of motion of a line contact from rest is studied. The transition from solid contact to lubricated contact is of importance in investigating the start-up process and its effects on bearing performance. The numerical results of Holmes et al. (2002) and others, concerning point contact and Newtonian lubricant, are not in good agreement with the known experimental data. The numerical film thickness is significantly smaller than the experimental values and the experimental velocity at which lubricant travels through the conjunction does not equal the entrainment velocity of numerical results. In the current paper, a lubricant with viscoelastic properties is considered. The Maxwell model of a lubricant at pure rolling of elastic cylinders is used. Also, as well as in work of Usov (2008) the model assumes the division of the whole area of contact into three zones: the dry contact of surfaces, the transient zone and the zone in which the surfaces are separated by a liquid lubricant layer. The rigid body model is assumed for the lubricant in the transient zone. The effects of viscoelasticity and size of transient zone on film thickness and the velocity at which the lubricant moves through the contact are studied. It is shown that viscoelasticity raises film thickness in a start of the motion and lowers the velocity at which the lubricant moves through the contact. This velocity is lower than the entrainment velocity in the first half of the contact, as in the experimental results with point contact. In the second half of the contact, this velocity may be lower or higher than the entrainment velocity depending on the size of the transient zone. The film thickness may increase considerably at the start of motion when the size of the transient zone increases.
650		4	\|a Velocity
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650		4	\|a Viscoelasticity
650		4	\|a Elastohydrodynamic lubrication
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allfields	10.1177/1350650115618924 doi PQ20160720 (DE-627)OLC1979466718 (DE-599)GBVOLC1979466718 (PRQ)c1293-e3c3066f692f51117a4add453edd3dc19e506f3850f4c24bc136f0ee65ef4c940 (KEY)0238186920160000230000700769effectsoflubricantviscoelasticityonfilmthicknessin DE-627 ger DE-627 rakwb eng 620 ZDB Usov, P. P verfasserin aut Effects of lubricant viscoelasticity on film thickness in elastohydrodynamic line contacts during start-up 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier By means of numerical simulation the elastohydrodynamic lubricating film formation during start-up of motion of a line contact from rest is studied. The transition from solid contact to lubricated contact is of importance in investigating the start-up process and its effects on bearing performance. The numerical results of Holmes et al. (2002) and others, concerning point contact and Newtonian lubricant, are not in good agreement with the known experimental data. The numerical film thickness is significantly smaller than the experimental values and the experimental velocity at which lubricant travels through the conjunction does not equal the entrainment velocity of numerical results. In the current paper, a lubricant with viscoelastic properties is considered. The Maxwell model of a lubricant at pure rolling of elastic cylinders is used. Also, as well as in work of Usov (2008) the model assumes the division of the whole area of contact into three zones: the dry contact of surfaces, the transient zone and the zone in which the surfaces are separated by a liquid lubricant layer. The rigid body model is assumed for the lubricant in the transient zone. The effects of viscoelasticity and size of transient zone on film thickness and the velocity at which the lubricant moves through the contact are studied. It is shown that viscoelasticity raises film thickness in a start of the motion and lowers the velocity at which the lubricant moves through the contact. This velocity is lower than the entrainment velocity in the first half of the contact, as in the experimental results with point contact. In the second half of the contact, this velocity may be lower or higher than the entrainment velocity depending on the size of the transient zone. The film thickness may increase considerably at the start of motion when the size of the transient zone increases. Velocity Simulation Viscoelasticity Elastohydrodynamic lubrication Enthalten in Proceedings of the Institution of Mechanical Engineers / J London [u.a.] : Inst., 1994 230(2016), 7, Seite 769-782 (DE-627)182004406 (DE-600)1181985-6 (DE-576)038882094 1350-6501 nnns volume:230 year:2016 number:7 pages:769-782 http://dx.doi.org/10.1177/1350650115618924 Volltext http://search.proquest.com/docview/1800724307 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_70 GBV_ILN_2006 AR 230 2016 7 769-782
spelling	10.1177/1350650115618924 doi PQ20160720 (DE-627)OLC1979466718 (DE-599)GBVOLC1979466718 (PRQ)c1293-e3c3066f692f51117a4add453edd3dc19e506f3850f4c24bc136f0ee65ef4c940 (KEY)0238186920160000230000700769effectsoflubricantviscoelasticityonfilmthicknessin DE-627 ger DE-627 rakwb eng 620 ZDB Usov, P. P verfasserin aut Effects of lubricant viscoelasticity on film thickness in elastohydrodynamic line contacts during start-up 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier By means of numerical simulation the elastohydrodynamic lubricating film formation during start-up of motion of a line contact from rest is studied. The transition from solid contact to lubricated contact is of importance in investigating the start-up process and its effects on bearing performance. The numerical results of Holmes et al. (2002) and others, concerning point contact and Newtonian lubricant, are not in good agreement with the known experimental data. The numerical film thickness is significantly smaller than the experimental values and the experimental velocity at which lubricant travels through the conjunction does not equal the entrainment velocity of numerical results. In the current paper, a lubricant with viscoelastic properties is considered. The Maxwell model of a lubricant at pure rolling of elastic cylinders is used. Also, as well as in work of Usov (2008) the model assumes the division of the whole area of contact into three zones: the dry contact of surfaces, the transient zone and the zone in which the surfaces are separated by a liquid lubricant layer. The rigid body model is assumed for the lubricant in the transient zone. The effects of viscoelasticity and size of transient zone on film thickness and the velocity at which the lubricant moves through the contact are studied. It is shown that viscoelasticity raises film thickness in a start of the motion and lowers the velocity at which the lubricant moves through the contact. This velocity is lower than the entrainment velocity in the first half of the contact, as in the experimental results with point contact. In the second half of the contact, this velocity may be lower or higher than the entrainment velocity depending on the size of the transient zone. The film thickness may increase considerably at the start of motion when the size of the transient zone increases. Velocity Simulation Viscoelasticity Elastohydrodynamic lubrication Enthalten in Proceedings of the Institution of Mechanical Engineers / J London [u.a.] : Inst., 1994 230(2016), 7, Seite 769-782 (DE-627)182004406 (DE-600)1181985-6 (DE-576)038882094 1350-6501 nnns volume:230 year:2016 number:7 pages:769-782 http://dx.doi.org/10.1177/1350650115618924 Volltext http://search.proquest.com/docview/1800724307 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_70 GBV_ILN_2006 AR 230 2016 7 769-782
allfields_unstemmed	10.1177/1350650115618924 doi PQ20160720 (DE-627)OLC1979466718 (DE-599)GBVOLC1979466718 (PRQ)c1293-e3c3066f692f51117a4add453edd3dc19e506f3850f4c24bc136f0ee65ef4c940 (KEY)0238186920160000230000700769effectsoflubricantviscoelasticityonfilmthicknessin DE-627 ger DE-627 rakwb eng 620 ZDB Usov, P. P verfasserin aut Effects of lubricant viscoelasticity on film thickness in elastohydrodynamic line contacts during start-up 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier By means of numerical simulation the elastohydrodynamic lubricating film formation during start-up of motion of a line contact from rest is studied. The transition from solid contact to lubricated contact is of importance in investigating the start-up process and its effects on bearing performance. The numerical results of Holmes et al. (2002) and others, concerning point contact and Newtonian lubricant, are not in good agreement with the known experimental data. The numerical film thickness is significantly smaller than the experimental values and the experimental velocity at which lubricant travels through the conjunction does not equal the entrainment velocity of numerical results. In the current paper, a lubricant with viscoelastic properties is considered. The Maxwell model of a lubricant at pure rolling of elastic cylinders is used. Also, as well as in work of Usov (2008) the model assumes the division of the whole area of contact into three zones: the dry contact of surfaces, the transient zone and the zone in which the surfaces are separated by a liquid lubricant layer. The rigid body model is assumed for the lubricant in the transient zone. The effects of viscoelasticity and size of transient zone on film thickness and the velocity at which the lubricant moves through the contact are studied. It is shown that viscoelasticity raises film thickness in a start of the motion and lowers the velocity at which the lubricant moves through the contact. This velocity is lower than the entrainment velocity in the first half of the contact, as in the experimental results with point contact. In the second half of the contact, this velocity may be lower or higher than the entrainment velocity depending on the size of the transient zone. The film thickness may increase considerably at the start of motion when the size of the transient zone increases. Velocity Simulation Viscoelasticity Elastohydrodynamic lubrication Enthalten in Proceedings of the Institution of Mechanical Engineers / J London [u.a.] : Inst., 1994 230(2016), 7, Seite 769-782 (DE-627)182004406 (DE-600)1181985-6 (DE-576)038882094 1350-6501 nnns volume:230 year:2016 number:7 pages:769-782 http://dx.doi.org/10.1177/1350650115618924 Volltext http://search.proquest.com/docview/1800724307 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC GBV_ILN_70 GBV_ILN_2006 AR 230 2016 7 769-782
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topic_title	620 ZDB Effects of lubricant viscoelasticity on film thickness in elastohydrodynamic line contacts during start-up Velocity Simulation Viscoelasticity Elastohydrodynamic lubrication
topic	ddc 620 misc Velocity misc Simulation misc Viscoelasticity misc Elastohydrodynamic lubrication
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title	Effects of lubricant viscoelasticity on film thickness in elastohydrodynamic line contacts during start-up
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title_full	Effects of lubricant viscoelasticity on film thickness in elastohydrodynamic line contacts during start-up
author_sort	Usov, P. P
journal	Proceedings of the Institution of Mechanical Engineers / J
journalStr	Proceedings of the Institution of Mechanical Engineers / J
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author_browse	Usov, P. P
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doi_str_mv	10.1177/1350650115618924
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title_sort	effects of lubricant viscoelasticity on film thickness in elastohydrodynamic line contacts during start-up
title_auth	Effects of lubricant viscoelasticity on film thickness in elastohydrodynamic line contacts during start-up
abstract	By means of numerical simulation the elastohydrodynamic lubricating film formation during start-up of motion of a line contact from rest is studied. The transition from solid contact to lubricated contact is of importance in investigating the start-up process and its effects on bearing performance. The numerical results of Holmes et al. (2002) and others, concerning point contact and Newtonian lubricant, are not in good agreement with the known experimental data. The numerical film thickness is significantly smaller than the experimental values and the experimental velocity at which lubricant travels through the conjunction does not equal the entrainment velocity of numerical results. In the current paper, a lubricant with viscoelastic properties is considered. The Maxwell model of a lubricant at pure rolling of elastic cylinders is used. Also, as well as in work of Usov (2008) the model assumes the division of the whole area of contact into three zones: the dry contact of surfaces, the transient zone and the zone in which the surfaces are separated by a liquid lubricant layer. The rigid body model is assumed for the lubricant in the transient zone. The effects of viscoelasticity and size of transient zone on film thickness and the velocity at which the lubricant moves through the contact are studied. It is shown that viscoelasticity raises film thickness in a start of the motion and lowers the velocity at which the lubricant moves through the contact. This velocity is lower than the entrainment velocity in the first half of the contact, as in the experimental results with point contact. In the second half of the contact, this velocity may be lower or higher than the entrainment velocity depending on the size of the transient zone. The film thickness may increase considerably at the start of motion when the size of the transient zone increases.
abstractGer	By means of numerical simulation the elastohydrodynamic lubricating film formation during start-up of motion of a line contact from rest is studied. The transition from solid contact to lubricated contact is of importance in investigating the start-up process and its effects on bearing performance. The numerical results of Holmes et al. (2002) and others, concerning point contact and Newtonian lubricant, are not in good agreement with the known experimental data. The numerical film thickness is significantly smaller than the experimental values and the experimental velocity at which lubricant travels through the conjunction does not equal the entrainment velocity of numerical results. In the current paper, a lubricant with viscoelastic properties is considered. The Maxwell model of a lubricant at pure rolling of elastic cylinders is used. Also, as well as in work of Usov (2008) the model assumes the division of the whole area of contact into three zones: the dry contact of surfaces, the transient zone and the zone in which the surfaces are separated by a liquid lubricant layer. The rigid body model is assumed for the lubricant in the transient zone. The effects of viscoelasticity and size of transient zone on film thickness and the velocity at which the lubricant moves through the contact are studied. It is shown that viscoelasticity raises film thickness in a start of the motion and lowers the velocity at which the lubricant moves through the contact. This velocity is lower than the entrainment velocity in the first half of the contact, as in the experimental results with point contact. In the second half of the contact, this velocity may be lower or higher than the entrainment velocity depending on the size of the transient zone. The film thickness may increase considerably at the start of motion when the size of the transient zone increases.
abstract_unstemmed	By means of numerical simulation the elastohydrodynamic lubricating film formation during start-up of motion of a line contact from rest is studied. The transition from solid contact to lubricated contact is of importance in investigating the start-up process and its effects on bearing performance. The numerical results of Holmes et al. (2002) and others, concerning point contact and Newtonian lubricant, are not in good agreement with the known experimental data. The numerical film thickness is significantly smaller than the experimental values and the experimental velocity at which lubricant travels through the conjunction does not equal the entrainment velocity of numerical results. In the current paper, a lubricant with viscoelastic properties is considered. The Maxwell model of a lubricant at pure rolling of elastic cylinders is used. Also, as well as in work of Usov (2008) the model assumes the division of the whole area of contact into three zones: the dry contact of surfaces, the transient zone and the zone in which the surfaces are separated by a liquid lubricant layer. The rigid body model is assumed for the lubricant in the transient zone. The effects of viscoelasticity and size of transient zone on film thickness and the velocity at which the lubricant moves through the contact are studied. It is shown that viscoelasticity raises film thickness in a start of the motion and lowers the velocity at which the lubricant moves through the contact. This velocity is lower than the entrainment velocity in the first half of the contact, as in the experimental results with point contact. In the second half of the contact, this velocity may be lower or higher than the entrainment velocity depending on the size of the transient zone. The film thickness may increase considerably at the start of motion when the size of the transient zone increases.
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title_short	Effects of lubricant viscoelasticity on film thickness in elastohydrodynamic line contacts during start-up
url	http://dx.doi.org/10.1177/1350650115618924 http://search.proquest.com/docview/1800724307
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doi_str	10.1177/1350650115618924
up_date	2024-07-04T01:04:06.309Z
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