1988 Fiscal Year Final Research Report Summary
Elastohydrodynamic Lubrication on Rough Surface with Asperity Contacts
| Project/Area Number |
62460088
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械要素
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| Research Institution | Kyoto University |
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Principal Investigator |
MORI Haruo Faculty of Engineering, Kyoto University, Professor, 工学部, 教授 (40025789)
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| Co-Investigator(Kenkyū-buntansha) |
IKEUCHI Ken ditto, Assistant, 工学部, 助手 (30026223)
YAMAMOTO Minoru ditto, Assistant, 工学部, 助手 (50026100)
MORI Atsunobu Faculty of Engineering, Kyoto University, Associate Professor, 工学部, 助教授 (80026202)
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| Project Period (FY) |
1987 – 1988
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| Keywords | Elasto-Mixed Lubrication / Squeeze Film / Surface Roughness / Average Flow Model / 人工関節 |
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| Research Abstract |
Basic characteristics of mixed lubrication were investigated for polymer or elastomer surface. New methods are presented to settle the relations among the contact pressure, the average film thickness and the pressure flow factor. Under heavy contact pressure, the surface texture is changed from the initial profile and becomes unsymmetrical for mean plane. At the same time, many isolated pools of lubricant are observed and the pressure induced flow decreases drastically.
Squeeze films between compliant rough surface and rigid surface are analyzed through elastohydrodynamic lubrication phase, elasto-mixed lubrication phase and solid contact phase. For a circular flat thruster, a sharp peak of the contact pressure appears along the outside boundary of the lubrication region with decrease in the fluid pressure. On the other hand, for a spherical thruster, the contact pressure distributes almost uniform when the fluid pressure is high, and thereafter, the contact pressure becomes high especially at the center. Squeeze film e ffect is maintained for a long time if a surface is soft and smooth. It is found that the average flow model is not valid unless the pools of lubricant are sufficiently smaller than the dimension of lubrication region.
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