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Open AccessArticle

Contact Mechanics for Solids with Randomly Rough Surfaces and Plasticity

PGI-1, FZ Jülich, 52425 Jülich, Germany
Universität des Saarlandes, D-66123 Saarbrücken, Germany
Multiscale Consulting, Wolfshovener Straße 2, 52428 Jülich, Germany
Author to whom correspondence should be addressed.
Lubricants 2019, 7(10), 90;
Received: 9 September 2019 / Revised: 8 October 2019 / Accepted: 12 October 2019 / Published: 16 October 2019
(This article belongs to the Special Issue Friction Mechanisms)
We present experimental results for the elastic and plastic deformation of sandblasted polymer balls resulting from contacts with flat smooth steel and silica glass surfaces. Nearly symmetric, Gaussian-like height probability distributions were observed experimentally before and remarkably, also after the polymer balls were deformed plastically. For all the polymers studied we find that the surface roughness power spectra for large wavenumbers (short length scales) are nearly unchanged after squeezing the polymer balls against flat surfaces. We attribute this to non-uniform plastic flow processes at the micrometer length scale. The experimental data are analyzed using the Persson contact mechanics theory with plasticity and with finite-element method (FEM) calculations. View Full-Text
Keywords: plasticity; roughness; contact mechanics; work-hardening; polymers plasticity; roughness; contact mechanics; work-hardening; polymers
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MDPI and ACS Style

Tiwari, A.; Wang, A.; Müser, M.H.; Persson, B.N.J. Contact Mechanics for Solids with Randomly Rough Surfaces and Plasticity. Lubricants 2019, 7, 90.

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