This title appears in the Scientific Report :
2018
Please use the identifier:
http://dx.doi.org/10.1039/C7SM00753A in citations.
Simple contact mechanics model of the vertebrate cartilage
Simple contact mechanics model of the vertebrate cartilage
We study a simple contact mechanics model of the vertebrate cartilage, which includes (bulk) osmotic effects. The surface roughness power spectrum of a pig cartilage is obtained from the measured surface topography. Using the Reynolds equations with fluid flow factors, calculated using the Persson c...
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Personal Name(s): | Persson, Bo (Corresponding author) |
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Kovalev, A. / Gorb, S. N. | |
Contributing Institute: |
Quanten-Theorie der Materialien; IAS-1 JARA - HPC; JARA-HPC JARA-FIT; JARA-FIT Quanten-Theorie der Materialien; PGI-1 |
Published in: | Soft matter, 13 (2017) 37, S. 6349 - 6362 |
Imprint: |
London
Royal Soc. of Chemistry
2017
|
PubMed ID: |
28868539 |
DOI: |
10.1039/C7SM00753A |
Document Type: |
Journal Article |
Research Program: |
Controlling Electron Charge-Based Phenomena |
Publikationsportal JuSER |
We study a simple contact mechanics model of the vertebrate cartilage, which includes (bulk) osmotic effects. The surface roughness power spectrum of a pig cartilage is obtained from the measured surface topography. Using the Reynolds equations with fluid flow factors, calculated using the Persson contact mechanics theory and the Bruggeman effective medium theory, we show how the area of contact and the average interfacial separation change with time. We found that in most cases the contact area percolates, resulting in islands of confined fluid which carry most of the external load. Most importantly, we find that the pressure in the area of real contact is nearly independent of the external load, and well below 1 MPa. This allows the surfaces in the area of “real contact”, to be separated (at nanometer range separation distance) by osmotic repulsion, resulting in a very small (breakloose) friction force observed even after a long time of stationary contact. |