Load-separation curves for the contact of self-affine rough surfaces

Abstract There are two main approximate theories in the contact of rough solids: Greenwood-Williamson asperity theories (GW) and Persson theories. Neither of them has been fully assessed so far with respect to load-separation curves. Focusing on the most important case of low fractal dimension (D f...

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Autores principales:	Antonio Papangelo, Norbert Hoffmann, Michele Ciavarella
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/48e3a91f64a1484ba287109e1913421c
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spelling	oai:doaj.org-article:48e3a91f64a1484ba287109e1913421c2021-12-02T16:06:12ZLoad-separation curves for the contact of self-affine rough surfaces10.1038/s41598-017-07234-42045-2322https://doaj.org/article/48e3a91f64a1484ba287109e1913421c2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07234-4https://doaj.org/toc/2045-2322Abstract There are two main approximate theories in the contact of rough solids: Greenwood-Williamson asperity theories (GW) and Persson theories. Neither of them has been fully assessed so far with respect to load-separation curves. Focusing on the most important case of low fractal dimension (D f = 2.2) with extensive numerical studies we find that: (i) Persson’s theory describes well the regime of intermediate pressures/contact area, but requires significant corrective factors: the latter depend also on upper wavevector cutoff of the roughness; hence, (ii) Persson’s theory does not predict the correct functional dependence on magnification; (iii) asperity theories in the discrete version even neglecting interaction effects are more appropriate in the range of relatively large separations, also to take into consideration of the large scatter in actual realization of the surface.Antonio PapangeloNorbert HoffmannMichele CiavarellaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Antonio Papangelo Norbert Hoffmann Michele Ciavarella Load-separation curves for the contact of self-affine rough surfaces
description	Abstract There are two main approximate theories in the contact of rough solids: Greenwood-Williamson asperity theories (GW) and Persson theories. Neither of them has been fully assessed so far with respect to load-separation curves. Focusing on the most important case of low fractal dimension (D f = 2.2) with extensive numerical studies we find that: (i) Persson’s theory describes well the regime of intermediate pressures/contact area, but requires significant corrective factors: the latter depend also on upper wavevector cutoff of the roughness; hence, (ii) Persson’s theory does not predict the correct functional dependence on magnification; (iii) asperity theories in the discrete version even neglecting interaction effects are more appropriate in the range of relatively large separations, also to take into consideration of the large scatter in actual realization of the surface.
format	article
author	Antonio Papangelo Norbert Hoffmann Michele Ciavarella
author_facet	Antonio Papangelo Norbert Hoffmann Michele Ciavarella
author_sort	Antonio Papangelo
title	Load-separation curves for the contact of self-affine rough surfaces
title_short	Load-separation curves for the contact of self-affine rough surfaces
title_full	Load-separation curves for the contact of self-affine rough surfaces
title_fullStr	Load-separation curves for the contact of self-affine rough surfaces
title_full_unstemmed	Load-separation curves for the contact of self-affine rough surfaces
title_sort	load-separation curves for the contact of self-affine rough surfaces
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/48e3a91f64a1484ba287109e1913421c
work_keys_str_mv	AT antoniopapangelo loadseparationcurvesforthecontactofselfaffineroughsurfaces AT norberthoffmann loadseparationcurvesforthecontactofselfaffineroughsurfaces AT micheleciavarella loadseparationcurvesforthecontactofselfaffineroughsurfaces
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Load-separation curves for the contact of self-affine rough surfaces

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