Lubricants, Volume 8, Issue 9 (September 2020) – 9 articles
Cover Story (view full-size image): Adhesion has a tremendous impact on cutting-edge applications, such as the development of nano- and micromechanical systems and bioinspired adhesives. Usually, roughness destroys adhesion; however, with some special types of roughness, adhesion enhancement may occur. In this study, the contact problem of a sphere that is in contact with a wavy axisymmetric single-scale substrate is studied. It is shown that adhesion enhancement either stops for "rigid" materials or is stopped by large waviness amplitudes due to the appearance of internal cracks. The enhancement effect is well captured by an equation in terms of the Johnson parameter. View this paper.
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