The coefficient of friction (COF) of metals is usually high, primarily because frictional contacts induce plastic deformation underneath the wear surface, resulting in surface roughening and formation of delaminating tribolayers. Lowering the COF of metals is crucial for improving the reliability and efficiency of metal contacts in engineering applications but is technically challenging. Refini...

Static packings of perfectly rigid particles with Coulomb friction are investigated theoretically and numerically. The problem of finding the contact forces in such packings is formulated mathematically. Letting the values of the contact forces define a vector in a high-dimensional space enables us to consider the set of all possible contact forces as a region embedded in this same space. It is...

Indentation marks in rolling–sliding contacts are known to increase the risk of failures in heavily loaded elastohydrodynamically lubricated contacts found in machine elements, like gears and rolling bearings. In this article, literature is discussed showing the different hypotheses available to explain the interaction of sliding with the indentation marks, in both gears and rolling bearings. W...

Grandin, M. 2017. Tribology of Metal-Graphite Composites. A Study of Sliding Electrical Contact Surfaces. Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 1565. 75 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-513-0079-5. An environmentally sustainable production of electrical power is important for preserving the earth’s natural res...