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Contact area and static friction of rough surfaces with high plasticity index / Li, L. in Transactions of the ASME . Journal of tribology, Vol. 132 N° 3 (Juillet 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 132 N° 3 (Juillet 2010) . - 10 p. Titre : Contact area and static friction of rough surfaces with high plasticity index Type de document : texte imprimé Auteurs : Li, L., Auteur ; I. Etsion, Auteur ; F. E. Talke, Auteur Année de publication : 2011 Article en page(s) : 10 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : plasticity  rough  surfaces  stiction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A model for the contact area and static friction of nominally flat rough surfaces and rough spherical surfaces is presented. The model extends previously published models, which are limited to plasticity index values below 8, to higher plasticity index values by accounting for fully plastically deformed asperities based on finite element results by Jackson and Green [2005, “A Finite Element Study of Elasto-Plastic Hemispherical Contact Against a Rigid Flat,” Trans. ASME, J. Tribol., 127, pp. 343–354]. The present model also corrects some deficiencies of the earlier models at very small plasticity index values below 0.5. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Contact area and static friction of rough surfaces with high plasticity index [texte imprimé] / Li, L., Auteur ; I. Etsion, Auteur ; F. E. Talke, Auteur . - 2011 . - 10 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 132 N° 3 (Juillet 2010) . - 10 p. Mots-clés : plasticity  rough  surfaces  stiction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A model for the contact area and static friction of nominally flat rough surfaces and rough spherical surfaces is presented. The model extends previously published models, which are limited to plasticity index values below 8, to higher plasticity index values by accounting for fully plastically deformed asperities based on finite element results by Jackson and Green [2005, “A Finite Element Study of Elasto-Plastic Hemispherical Contact Against a Rigid Flat,” Trans. ASME, J. Tribol., 127, pp. 343–354]. The present model also corrects some deficiencies of the earlier models at very small plasticity index values below 0.5. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]

Experimental study of adhesive static friction in a spherical elastic-plastic contact / A. Ovcharenko in Transactions of the ASME . Journal of tribology, Vol. 130 n°2 (Mars/Avril 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 n°2 (Mars/Avril 2008) . - 6 p. Titre : Experimental study of adhesive static friction in a spherical elastic-plastic contact Type de document : texte imprimé Auteurs : A. Ovcharenko, Auteur ; G. Halperin, Auteur ; I. Etsion, Auteur Année de publication : 2008 Article en page(s) : 6 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Deformable  sphereAdhesive  static  friction Résumé : The elastic-plastic contact between a deformable sphere and a rigid flat during presliding is studied experimentally. Measurements of friction force and contact area are done in real time along with an accurate identification of the instant of sliding inception. The static friction force and relative tangential displacement are investigated over a wide range of normal preloads for several sphere materials and diameters. Different behavior of the static friction is observed in the elastic and in the elastic-plastic regimes of sphere deformation. It is found that at low normal loads, the static friction coefficient depends on the normal load in breach of the classical laws of friction. The presliding displacement is found to be less than 5% of the contact diameter, and the interface mean shear stress at sliding inception is found to be slightly below the shear strength of the sphere material. Good correlation is found between the present experimental results and a recent theoretical model in the elastic-plastic regime of deformation. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468006 [article] Experimental study of adhesive static friction in a spherical elastic-plastic contact [texte imprimé] / A. Ovcharenko, Auteur ; G. Halperin, Auteur ; I. Etsion, Auteur . - 2008 . - 6 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 n°2 (Mars/Avril 2008) . - 6 p. Mots-clés : Deformable  sphereAdhesive  static  friction Résumé : The elastic-plastic contact between a deformable sphere and a rigid flat during presliding is studied experimentally. Measurements of friction force and contact area are done in real time along with an accurate identification of the instant of sliding inception. The static friction force and relative tangential displacement are investigated over a wide range of normal preloads for several sphere materials and diameters. Different behavior of the static friction is observed in the elastic and in the elastic-plastic regimes of sphere deformation. It is found that at low normal loads, the static friction coefficient depends on the normal load in breach of the classical laws of friction. The presliding displacement is found to be less than 5% of the contact diameter, and the interface mean shear stress at sliding inception is found to be slightly below the shear strength of the sphere material. Good correlation is found between the present experimental results and a recent theoretical model in the elastic-plastic regime of deformation. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468006

A model for contact and static friction of nominally flat rough surfaces under full stick contact condition / D. Cohen in Transactions of the ASME . Journal of tribology, Vol. 130 n°3 (Juillet 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 130 n°3 (Juillet 2008) . - 9 p. Titre : A model for contact and static friction of nominally flat rough surfaces under full stick contact condition Type de document : texte imprimé Auteurs : D. Cohen, Auteur ; Y. Kligerman, Auteur ; I. Etsion, Auteur Année de publication : 2008 Article en page(s) : 9 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Force  Plasticity  Friction  Surface  roughness  Stress  Stiction  Junctions  Equations Résumé : A model for elastic-plastic nominally flat contacting rough surfaces under combined normal and tangential loading with full stick contact condition is presented. The model incorporates an accurate finite element analysis for contact and sliding inception of a single elastic-plastic asperity in a statistical representation of surface roughness. It includes the effect of junction growth and treats the sliding inception as a failure mechanism, which is characterized by loss of tangential stiffness. A comparison between the present model and a previously published friction model shows that the latter severely underestimates the maximum friction force by up to three orders of magnitude. Strong effects of the normal load, nominal contact area, mechanical properties, and surface roughness on the static friction coefficient are found, in breach of the classical laws of friction. Empirical equations for the maximum friction force, static friction coefficient, real contact area due to the normal load alone and at sliding inception as functions of the normal load, material properties, and surface roughness are presented and compared with some limited available experimental results. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468059 [article] A model for contact and static friction of nominally flat rough surfaces under full stick contact condition [texte imprimé] / D. Cohen, Auteur ; Y. Kligerman, Auteur ; I. Etsion, Auteur . - 2008 . - 9 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 n°3 (Juillet 2008) . - 9 p. Mots-clés : Force  Plasticity  Friction  Surface  roughness  Stress  Stiction  Junctions  Equations Résumé : A model for elastic-plastic nominally flat contacting rough surfaces under combined normal and tangential loading with full stick contact condition is presented. The model incorporates an accurate finite element analysis for contact and sliding inception of a single elastic-plastic asperity in a statistical representation of surface roughness. It includes the effect of junction growth and treats the sliding inception as a failure mechanism, which is characterized by loss of tangential stiffness. A comparison between the present model and a previously published friction model shows that the latter severely underestimates the maximum friction force by up to three orders of magnitude. Strong effects of the normal load, nominal contact area, mechanical properties, and surface roughness on the static friction coefficient are found, in breach of the classical laws of friction. Empirical equations for the maximum friction force, static friction coefficient, real contact area due to the normal load alone and at sliding inception as functions of the normal load, material properties, and surface roughness are presented and compared with some limited available experimental results. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=1468059

The evolution of static friction for elastic-plastic spherical contact in pre-sliding / V. Zolotarevskiy in Transactions of the ASME . Journal of tribology, Vol. 133 N° 3 (Juillet 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 133 N° 3 (Juillet 2011) . - 03 p. Titre : The evolution of static friction for elastic-plastic spherical contact in pre-sliding Type de document : texte imprimé Auteurs : V. Zolotarevskiy, Auteur ; Y. Kligerman, Auteur ; I. Etsion, Auteur Année de publication : 2012 Article en page(s) : 03 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Elastic  constants  Elastoplasticity  Mechanical  contact  Stiction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The evolution of static friction and tangential stiffness in presliding of an elastic-plastic sphere in contact with a rigid flat, under full stick contact condition, is analyzed. Empirical dimensionless equations are developed for these parameters. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] The evolution of static friction for elastic-plastic spherical contact in pre-sliding [texte imprimé] / V. Zolotarevskiy, Auteur ; Y. Kligerman, Auteur ; I. Etsion, Auteur . - 2012 . - 03 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 133 N° 3 (Juillet 2011) . - 03 p. Mots-clés : Elastic  constants  Elastoplasticity  Mechanical  contact  Stiction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The evolution of static friction and tangential stiffness in presliding of an elastic-plastic sphere in contact with a rigid flat, under full stick contact condition, is analyzed. Empirical dimensionless equations are developed for these parameters. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]