Mixed Friction in Fully Lubricated Elastohydrodynamic Contacts—Theory or Reality
Mixed friction in liquid-lubricated tribosystems is characterized by the simultaneous presence of liquid and solid friction. Liquid friction results from the shearing of the lubricant, and solid friction from deformation and adhesion. Elastic hysteresis and plastic deformation of the solids cause en...
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MDPI AG
2024-10-01
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| author | Dirk Bartel |
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| collection | DOAJ |
| description | Mixed friction in liquid-lubricated tribosystems is characterized by the simultaneous presence of liquid and solid friction. Liquid friction results from the shearing of the lubricant, and solid friction from deformation and adhesion. Elastic hysteresis and plastic deformation of the solids cause energy losses during deformation and the separation of molecular bonds between the solids causes energy losses during adhesion. The classic conception of mixed friction presupposes direct contact between rough solids for solid friction to exist. However, if hysteresis losses are fully accepted as a cause for solid friction, every fully lubricated elastohydrodynamic contact would ultimately be a mixed friction contact since the elastic deformations of the solids also cause a loss of energy induced by hysteresis. Thus, the classic conception of mixed friction should be expanded since mixed friction can occur even when solids do not have any direct contact. |
| format | Article |
| id | doaj-art-a84d8e63678842feb100f770a6f1fa3e |
| institution | OA Journals |
| issn | 2075-4442 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Lubricants |
| spelling | doaj-art-a84d8e63678842feb100f770a6f1fa3e2025-08-20T02:10:56ZengMDPI AGLubricants2075-44422024-10-01121035110.3390/lubricants12100351Mixed Friction in Fully Lubricated Elastohydrodynamic Contacts—Theory or RealityDirk Bartel0Chair of Machine Elements and Tribology, Otto von Guericke University Magdeburg, 39106 Magdeburg, GermanyMixed friction in liquid-lubricated tribosystems is characterized by the simultaneous presence of liquid and solid friction. Liquid friction results from the shearing of the lubricant, and solid friction from deformation and adhesion. Elastic hysteresis and plastic deformation of the solids cause energy losses during deformation and the separation of molecular bonds between the solids causes energy losses during adhesion. The classic conception of mixed friction presupposes direct contact between rough solids for solid friction to exist. However, if hysteresis losses are fully accepted as a cause for solid friction, every fully lubricated elastohydrodynamic contact would ultimately be a mixed friction contact since the elastic deformations of the solids also cause a loss of energy induced by hysteresis. Thus, the classic conception of mixed friction should be expanded since mixed friction can occur even when solids do not have any direct contact.https://www.mdpi.com/2075-4442/12/10/351elastohydrodynamicshysteresis frictionmixed frictionfriction stateslubrication states |
| spellingShingle | Dirk Bartel Mixed Friction in Fully Lubricated Elastohydrodynamic Contacts—Theory or Reality Lubricants elastohydrodynamics hysteresis friction mixed friction friction states lubrication states |
| title | Mixed Friction in Fully Lubricated Elastohydrodynamic Contacts—Theory or Reality |
| title_full | Mixed Friction in Fully Lubricated Elastohydrodynamic Contacts—Theory or Reality |
| title_fullStr | Mixed Friction in Fully Lubricated Elastohydrodynamic Contacts—Theory or Reality |
| title_full_unstemmed | Mixed Friction in Fully Lubricated Elastohydrodynamic Contacts—Theory or Reality |
| title_short | Mixed Friction in Fully Lubricated Elastohydrodynamic Contacts—Theory or Reality |
| title_sort | mixed friction in fully lubricated elastohydrodynamic contacts theory or reality |
| topic | elastohydrodynamics hysteresis friction mixed friction friction states lubrication states |
| url | https://www.mdpi.com/2075-4442/12/10/351 |
| work_keys_str_mv | AT dirkbartel mixedfrictioninfullylubricatedelastohydrodynamiccontactstheoryorreality |