Documents disponibles écrits par cet auteur

A laser surface textured journal bearing / V. Brizmer in Transactions of the ASME . Journal of tribology, Vol. 134 N° 3 (Juillet 2012) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 134 N° 3 (Juillet 2012) . - 09 p. Titre : A laser surface textured journal bearing Type de document : texte imprimé Auteurs : V. Brizmer, Auteur ; Y. Kligerman, Auteur Année de publication : 2012 Article en page(s) : 09 p. Note générale : tribology Langues : Anglais (eng) Mots-clés : hydrodynamic  lubrication;  journal  bearings;  laser  surface  texturing;  load  capacity Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The potential use of laser surface texturing (LST) in hydrodynamic journal bearings is examined theoretically. The regular surface texture has the form of micro-dimples with preselected diameter, depth, and area density. It can be applied to only a certain portion of the bearing perimeter (partial LST) or the full bearing perimeter (full LST). The effect of such a texture on load capacity and on the attitude angle of the journal bearing is investigated in the present work. The optimum parameters of the dimples and favorable LST mode for maximum load capacity have been found. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000003 [...] [article] A laser surface textured journal bearing [texte imprimé] / V. Brizmer, Auteur ; Y. Kligerman, Auteur . - 2012 . - 09 p. tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 134 N° 3 (Juillet 2012) . - 09 p. Mots-clés : hydrodynamic  lubrication;  journal  bearings;  laser  surface  texturing;  load  capacity Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The potential use of laser surface texturing (LST) in hydrodynamic journal bearings is examined theoretically. The regular surface texture has the form of micro-dimples with preselected diameter, depth, and area density. It can be applied to only a certain portion of the bearing perimeter (partial LST) or the full bearing perimeter (full LST). The effect of such a texture on load capacity and on the attitude angle of the journal bearing is investigated in the present work. The optimum parameters of the dimples and favorable LST mode for maximum load capacity have been found. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000003 [...]

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

Multiple normal loading-unloading cycles of a spherical contact under stick contact condition / Y. Zait in Transactions of the ASME . Journal of tribology, Vol. 132 N° 4 (Octobre 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of tribology > Vol. 132 N° 4 (Octobre 2010) . - 07 p. Titre : Multiple normal loading-unloading cycles of a spherical contact under stick contact condition Type de document : texte imprimé Auteurs : Y. Zait, Auteur ; V. Zolotarevsky, Auteur ; Y. Kligerman, Auteur Année de publication : 2011 Article en page(s) : 07 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Elasticity  Finite  element  analysis  Hardening  Loading  Mechanical  contact  Plasticity  Unloading Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The multiple normal loading-unloading process of an elastic-plastic sphere by a rigid flat is analyzed using finite element method for stick contact condition and both kinematic and isotropic hardening models. The behavior of the global contact parameters as well as the stress field within the sphere tip is presented for several loading cycles. It was found that under stick contact condition, secondary plastification occurs even after the second loading cycle and that the hardening model used has little effect on the loading-unloading process. The cyclic loading process gradually converges into elastic shakedown. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Multiple normal loading-unloading cycles of a spherical contact under stick contact condition [texte imprimé] / Y. Zait, Auteur ; V. Zolotarevsky, Auteur ; Y. Kligerman, Auteur . - 2011 . - 07 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 132 N° 4 (Octobre 2010) . - 07 p. Mots-clés : Elasticity  Finite  element  analysis  Hardening  Loading  Mechanical  contact  Plasticity  Unloading Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The multiple normal loading-unloading process of an elastic-plastic sphere by a rigid flat is analyzed using finite element method for stick contact condition and both kinematic and isotropic hardening models. The behavior of the global contact parameters as well as the stress field within the sphere tip is presented for several loading cycles. It was found that under stick contact condition, secondary plastification occurs even after the second loading cycle and that the hardening model used has little effect on the loading-unloading process. The cyclic loading process gradually converges into elastic shakedown. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]

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 [...]