Please use this identifier to cite or link to this item:
doi:10.22028/D291-38105
Title: | Are There Limits to Superlubricity of Graphene in Hard, Rough Contacts? |
Author(s): | Müser, Martin H. |
Language: | English |
Title: | Frontiers in Mechanical Engineering |
Volume: | 5 |
Publisher/Platform: | Frontiers |
Year of Publication: | 2019 |
Free key words: | friction superlubricity contact mechanics theory graphene |
DDC notations: | 500 Science |
Publikation type: | Journal Article |
Abstract: | Yes, there are. They result from the splitting of a large correlated contact into many small patches. When the lubricant consists of thin solid sheets, like graphene, the patches are expected to act independently from each other. Crude estimates for the friction forces between hard, stiff solids with randomly rough surfaces are given, which apply to surfaces with Hurst roughness exponents H > 0.5. The estimates are obtained by combining realistic contact-patch-size distributions with friction-load relations deduced for isolated contact patches. The analysis reveals that load is carried predominantly by large patches, while most frictional forces stem from small contact patches. Low friction is favored when the root-mean-square height gradients are small, while a large roll-off wavelength and thus large root-mean-square roughness is predicted to lead to small friction. Moreover, friction is found to increase sublinearly with load in a nominally flat, structurally lubric contact. |
DOI of the first publication: | 10.3389/fmech.2019.00028 |
URL of the first publication: | https://www.frontiersin.org/articles/10.3389/fmech.2019.00028/full |
Link to this record: | urn:nbn:de:bsz:291--ds-381059 hdl:20.500.11880/34416 http://dx.doi.org/10.22028/D291-38105 |
ISSN: | 2297-3079 |
Date of registration: | 21-Nov-2022 |
Faculty: | NT - Naturwissenschaftlich- Technische Fakultät |
Department: | NT - Materialwissenschaft und Werkstofftechnik |
Professorship: | NT - Prof. Dr. Martin Müser |
Collections: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
Files for this record:
File | Description | Size | Format | |
---|---|---|---|---|
fmech-05-00028.pdf | 544,05 kB | Adobe PDF | View/Open |
This item is licensed under a Creative Commons License