Contact Mechanics for Solids with Randomly Rough Surfaces and Plasticity

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 aft...

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Published inLubricants Vol. 7; no. 10; p. 90
Main Authors Tiwari, Avinash, Wang, Anle, Müser, Martin H., Persson, B. N. J.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2019
Subjects
contact mechanics
Deformation
Elastic deformation
Experiments
Finite element method
Flat surfaces
Mechanical properties
Mechanics
Mechanics (physics)
Normal distribution
Plastic deformation
Plastic flow
Plastic properties
plasticity
Polymers
Power spectra
roughness
Silica glass
Silicon dioxide
Surface roughness
Viscoelasticity
work-hardening
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ISSN2075-4442
2075-4442
DOI10.3390/lubricants7100090

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Summary: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.
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ISSN:2075-4442
2075-4442
DOI:10.3390/lubricants7100090