Please use this identifier to cite or link to this item:
doi:10.22028/D291-27516
Title: | Contact-Patch-Size Distribution and Limits of Self-Affinity in Contacts between Randomly Rough Surfaces |
Author(s): | Müser, Martin H. Wang, Anle |
Language: | English |
Title: | Lubricants |
Volume: | 6 |
Issue: | 4 |
Publisher/Platform: | MDPI |
Year of Publication: | 2018 |
Free key words: | surface roughness contact mechanic friction wear Amontons’ law Archard’s law |
DDC notations: | 600 Technology |
Publikation type: | Journal Article |
Abstract: | True contact between solids with randomly rough surfaces tends to occur at a large number of microscopic contact patches. Thus far, two scaling regimes have been identified for the number density n(A) of contact-patch sizes A in elastic, non-adhesive, self-affine contacts. At small A, n(A) is approximately constant, while n(A) decreases as a power law at large A. Using Green’s function molecular dynamics, we identify a characteristic (maximum) contact area Ac above which a superexponential decay of n(A) becomes apparent if the contact pressure is below the pressure pcp at which contact percolates. We also find that Ac increases with load relatively slowly far away from contact percolation. Results for Ac can be estimated from the stress autocorrelation function Gσσ(r) with the following argument: the radius of characteristic contact patches, rc, cannot be so large that Gσσ(rc) is much less than p2cp. Our findings provide a possible mechanism for the breakdown of the proportionality between friction and wear with load at large contact pressures and/or for surfaces with a large roll-off wavelength. |
DOI of the first publication: | 10.3390/lubricants6040085 |
Link to this record: | urn:nbn:de:bsz:291--ds-275162 hdl:20.500.11880/28903 http://dx.doi.org/10.22028/D291-27516 |
ISSN: | 2075-4442 |
Date of registration: | 22-Mar-2020 |
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 | |
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lubricants-06-00085.pdf | 3,58 MB | Adobe PDF | View/Open |
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