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
contact mechanics
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:
Link to this record: urn:nbn:de:bsz:291--ds-381059
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

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