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A continuum description of dense granular lubrication flow / John Tichy 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) . - 8 p. Titre : A continuum description of dense granular lubrication flow Type de document : texte imprimé Auteurs : John Tichy, Auteur ; Yves Berthier, Auteur ; Ivan Iordanoff, Auteur Année de publication : 2008 Article en page(s) : 8 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Flow  (Dynamics)  Lubrication  Particulate  matter  Shear  (Mechanics)  Equations  Stress  Gravity  (Force)  Force  Engineering  simulation Résumé : The present paper applies a recent continuum theory due to Aranson and Tsimring (2002, “Continuum Theory of Partially Fluidized Granular Flows ,” Phys. Rev. E, 65, p. 061303) for the dense granular flow of particles in sustained contact to lubrication flows. Such third body granular flow may apply to some solid lubrication mechanisms. The continuum theory is unique in that it addresses solidlike behavior and the transition to fully fluidized behavior. The continuum studies are complemented by a discrete particle dynamics model of Iordanoff (2005, “Numerical Study of a Thin Layer of Cohesive Particles Under Plane Shearing ,” Powder Technol., 159, pp. 46–54). Three problems are treated: (1) flow due to the gravity of a layer of granular material down an inclined plane, (2) simple shear flow of a layer confined between sliding parallel surfaces, and (3) lubrication flow of a layer confined between a curved surface and a sliding plane. The perspective of this paper is that a continuum model will be more useful than a discrete model in engineering design of solid lubrication systems for the foreseeable future. In the inclined plane problem, the discrete simulations are used to provide material property parameters to the continuum model. In the simple shear problem, for validation, predictions of the continuum model are compared to those of the discrete element computer simulations. Finally, the continuum theory is applied to a more complex lubrication flow. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468057 [article] A continuum description of dense granular lubrication flow [texte imprimé] / John Tichy, Auteur ; Yves Berthier, Auteur ; Ivan Iordanoff, Auteur . - 2008 . - 8 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 n°3 (Juillet 2008) . - 8 p. Mots-clés : Flow  (Dynamics)  Lubrication  Particulate  matter  Shear  (Mechanics)  Equations  Stress  Gravity  (Force)  Force  Engineering  simulation Résumé : The present paper applies a recent continuum theory due to Aranson and Tsimring (2002, “Continuum Theory of Partially Fluidized Granular Flows ,” Phys. Rev. E, 65, p. 061303) for the dense granular flow of particles in sustained contact to lubrication flows. Such third body granular flow may apply to some solid lubrication mechanisms. The continuum theory is unique in that it addresses solidlike behavior and the transition to fully fluidized behavior. The continuum studies are complemented by a discrete particle dynamics model of Iordanoff (2005, “Numerical Study of a Thin Layer of Cohesive Particles Under Plane Shearing ,” Powder Technol., 159, pp. 46–54). Three problems are treated: (1) flow due to the gravity of a layer of granular material down an inclined plane, (2) simple shear flow of a layer confined between sliding parallel surfaces, and (3) lubrication flow of a layer confined between a curved surface and a sliding plane. The perspective of this paper is that a continuum model will be more useful than a discrete model in engineering design of solid lubrication systems for the foreseeable future. In the inclined plane problem, the discrete simulations are used to provide material property parameters to the continuum model. In the simple shear problem, for validation, predictions of the continuum model are compared to those of the discrete element computer simulations. Finally, the continuum theory is applied to a more complex lubrication flow. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468057

Modeling of magnetorheological fluids by the discrete element method / Mickaël Kargulewicz 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 : Modeling of magnetorheological fluids by the discrete element method Type de document : texte imprimé Auteurs : Mickaël Kargulewicz, Auteur ; Ivan Iordanoff, Auteur ; Victor Marrero, Auteur Année de publication : 2012 Article en page(s) : 09 p. Note générale : tribology Langues : Anglais (eng) Mots-clés : magnetism;  lubrication;  hydrodynamic;  rheology;  new-Newtinian Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Magnetorheological (MR) fluids are fluids whose properties vary in response to an applied magnetic field. Such fluids are typically composed of microscopic iron particles (~1-20µm diameter, 20-40% by volume) suspended in a carrier fluid such as mineral oil or water. MR fluids are increasingly proposed for use in various mechanical system applications, many of which fall in the domain of tribology, such as smart dampers and clutches, prosthetic articulations, and controllable polishing fluids. The goal of this study is to present an overview of the topic to the tribology audience, and to develop an MR fluid model from the microscopic point of view using the discrete element method (DEM), with a long range objective to better optimize and understand MR fluid behavior in such tribological applications. As in most DEM studies, inter-particle forces are determined by a force-displacement law and trajectories are calculated using Newton's second law. In this study, particle magnetization and magnetic interactions between particles have been added to the discrete element code. The global behavior of the MR fluid can be analyzed by examining the time evolution of the ensemble of particles. Microscopically, the known behavior is observed: particles align themselves with the external magnetic field. Macroscopically, averaging over a number of particles and a significant time interval, effective viscosity increases significantly when an external magnetic field is applied. These preliminary results would appear to establish that the DEM is a promising method to study MR fluids at the microscopic and macroscopic scales as an aid to tribological design. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000003 [...] [article] Modeling of magnetorheological fluids by the discrete element method [texte imprimé] / Mickaël Kargulewicz, Auteur ; Ivan Iordanoff, Auteur ; Victor Marrero, 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 : magnetism;  lubrication;  hydrodynamic;  rheology;  new-Newtinian Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Magnetorheological (MR) fluids are fluids whose properties vary in response to an applied magnetic field. Such fluids are typically composed of microscopic iron particles (~1-20µm diameter, 20-40% by volume) suspended in a carrier fluid such as mineral oil or water. MR fluids are increasingly proposed for use in various mechanical system applications, many of which fall in the domain of tribology, such as smart dampers and clutches, prosthetic articulations, and controllable polishing fluids. The goal of this study is to present an overview of the topic to the tribology audience, and to develop an MR fluid model from the microscopic point of view using the discrete element method (DEM), with a long range objective to better optimize and understand MR fluid behavior in such tribological applications. As in most DEM studies, inter-particle forces are determined by a force-displacement law and trajectories are calculated using Newton's second law. In this study, particle magnetization and magnetic interactions between particles have been added to the discrete element code. The global behavior of the MR fluid can be analyzed by examining the time evolution of the ensemble of particles. Microscopically, the known behavior is observed: particles align themselves with the external magnetic field. Macroscopically, averaging over a number of particles and a significant time interval, effective viscosity increases significantly when an external magnetic field is applied. These preliminary results would appear to establish that the DEM is a promising method to study MR fluids at the microscopic and macroscopic scales as an aid to tribological design. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000003 [...]

Thermal study of the dry sliding contact with third body presence / David Richard 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) . - 10 p. Titre : Thermal study of the dry sliding contact with third body presence Type de document : texte imprimé Auteurs : David Richard, Auteur ; Ivan Iordanoff, Auteur ; Mathieu Renouf, Auteur Année de publication : 2008 Article en page(s) : 10 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Heat  Temperature  Rheology  Particulate  matter Résumé : When the thermal aspect of sliding contacts is investigated, few models take into account the presence of a third body at the contact interface. Moreover, when the presence of the third body is considered, its rheology is neglected. For this reason, the thermal study of such contact configuration is not fully understood and relies on strong hypothesis or even important simplifications. To fill this lack of knowledge, a thermal model has been developed embedded in a discrete element scheme. Such investigations highlight the key role played by both thermal and mechanical properties of the contact elements. If the third body rheology can affect the localization of the heat generation leading to important thermal asymmetries, the diffusive nature of the first bodies can also strongly control the phenomenon and accentuate or diminish the initial differences of surfaces temperature for the contacting volumes. The goal of this paper is to bring information or complete existing theories (Blok, H. A., 1937, “Theoretical Study of Temperature Rise at Surface at Actual Contact Under Oilness Lubricating Conditions ,” I. Mech. E. Conf. Publ., 2, pp. 222–235;Ryhming, I. L., 1979, “On Temperature and Heat Source Distributions in Sliding Contact Problems ,” Acta Mech., 32, pp. 261–274;Dragon-Louiset, M., and Stolz, C., 1999, “Approche Thermodynamique des Phénomenès liés à l’Usure de Contact ,” Acad. Sci. Paris, C. R., 327, pp. 1275–1280) but also to bring a new point of view on the differences observed in the past between the numerical predictions and experimental measurements. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468062 [article] Thermal study of the dry sliding contact with third body presence [texte imprimé] / David Richard, Auteur ; Ivan Iordanoff, Auteur ; Mathieu Renouf, Auteur . - 2008 . - 10 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 n°3 (Juillet 2008) . - 10 p. Mots-clés : Heat  Temperature  Rheology  Particulate  matter Résumé : When the thermal aspect of sliding contacts is investigated, few models take into account the presence of a third body at the contact interface. Moreover, when the presence of the third body is considered, its rheology is neglected. For this reason, the thermal study of such contact configuration is not fully understood and relies on strong hypothesis or even important simplifications. To fill this lack of knowledge, a thermal model has been developed embedded in a discrete element scheme. Such investigations highlight the key role played by both thermal and mechanical properties of the contact elements. If the third body rheology can affect the localization of the heat generation leading to important thermal asymmetries, the diffusive nature of the first bodies can also strongly control the phenomenon and accentuate or diminish the initial differences of surfaces temperature for the contacting volumes. The goal of this paper is to bring information or complete existing theories (Blok, H. A., 1937, “Theoretical Study of Temperature Rise at Surface at Actual Contact Under Oilness Lubricating Conditions ,” I. Mech. E. Conf. Publ., 2, pp. 222–235;Ryhming, I. L., 1979, “On Temperature and Heat Source Distributions in Sliding Contact Problems ,” Acta Mech., 32, pp. 261–274;Dragon-Louiset, M., and Stolz, C., 1999, “Approche Thermodynamique des Phénomenès liés à l’Usure de Contact ,” Acad. Sci. Paris, C. R., 327, pp. 1275–1280) but also to bring a new point of view on the differences observed in the past between the numerical predictions and experimental measurements. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468062

Thermal study of the dry sliding contact with third body presence / David Richard 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) . - 10 p. Titre : Thermal study of the dry sliding contact with third body presence Type de document : texte imprimé Auteurs : David Richard, Auteur ; Ivan Iordanoff, Auteur ; Mathieu Renouf, Auteur Année de publication : 2008 Article en page(s) : 10 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Heat  Temperature  Rheology  Particulate  matter Résumé : When the thermal aspect of sliding contacts is investigated, few models take into account the presence of a third body at the contact interface. Moreover, when the presence of the third body is considered, its rheology is neglected. For this reason, the thermal study of such contact configuration is not fully understood and relies on strong hypothesis or even important simplifications. To fill this lack of knowledge, a thermal model has been developed embedded in a discrete element scheme. Such investigations highlight the key role played by both thermal and mechanical properties of the contact elements. If the third body rheology can affect the localization of the heat generation leading to important thermal asymmetries, the diffusive nature of the first bodies can also strongly control the phenomenon and accentuate or diminish the initial differences of surfaces temperature for the contacting volumes. The goal of this paper is to bring information or complete existing theories (Blok, H. A., 1937, “Theoretical Study of Temperature Rise at Surface at Actual Contact Under Oilness Lubricating Conditions ,” I. Mech. E. Conf. Publ., 2, pp. 222–235;Ryhming, I. L., 1979, “On Temperature and Heat Source Distributions in Sliding Contact Problems ,” Acta Mech., 32, pp. 261–274;Dragon-Louiset, M., and Stolz, C., 1999, “Approche Thermodynamique des Phénomenès liés à l’Usure de Contact ,” Acad. Sci. Paris, C. R., 327, pp. 1275–1280) but also to bring a new point of view on the differences observed in the past between the numerical predictions and experimental measurements. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468062 [article] Thermal study of the dry sliding contact with third body presence [texte imprimé] / David Richard, Auteur ; Ivan Iordanoff, Auteur ; Mathieu Renouf, Auteur . - 2008 . - 10 p. Tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 130 n°3 (Juillet 2008) . - 10 p. Mots-clés : Heat  Temperature  Rheology  Particulate  matter Résumé : When the thermal aspect of sliding contacts is investigated, few models take into account the presence of a third body at the contact interface. Moreover, when the presence of the third body is considered, its rheology is neglected. For this reason, the thermal study of such contact configuration is not fully understood and relies on strong hypothesis or even important simplifications. To fill this lack of knowledge, a thermal model has been developed embedded in a discrete element scheme. Such investigations highlight the key role played by both thermal and mechanical properties of the contact elements. If the third body rheology can affect the localization of the heat generation leading to important thermal asymmetries, the diffusive nature of the first bodies can also strongly control the phenomenon and accentuate or diminish the initial differences of surfaces temperature for the contacting volumes. The goal of this paper is to bring information or complete existing theories (Blok, H. A., 1937, “Theoretical Study of Temperature Rise at Surface at Actual Contact Under Oilness Lubricating Conditions ,” I. Mech. E. Conf. Publ., 2, pp. 222–235;Ryhming, I. L., 1979, “On Temperature and Heat Source Distributions in Sliding Contact Problems ,” Acta Mech., 32, pp. 261–274;Dragon-Louiset, M., and Stolz, C., 1999, “Approche Thermodynamique des Phénomenès liés à l’Usure de Contact ,” Acad. Sci. Paris, C. R., 327, pp. 1275–1280) but also to bring a new point of view on the differences observed in the past between the numerical predictions and experimental measurements. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468062