1. Numerical investigation on the electrical transmission ability of a shearing powder layer
- Author
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R. Hamdi, Chaoqun Zeng, Mathieu Renouf, Yves Berthier, Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Physique et Mécanique des Milieux Divisés ( PMMD ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] ( LaMCoS ), Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Centre National de la Recherche Scientifique ( CNRS ), Valéo Systèmes électriques, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Materials science ,[ SPI.MECA ] Engineering Sciences [physics]/Mechanics [physics.med-ph] ,[ SPI.MAT ] Engineering Sciences [physics]/Materials ,General Physics and Astronomy ,02 engineering and technology ,01 natural sciences ,[SPI.MAT]Engineering Sciences [physics]/Materials ,Physics::Fluid Dynamics ,[SPI.GCIV.IT]Engineering Sciences [physics]/Civil Engineering/Infrastructures de transport ,[ SPI.GCIV.IT ] Engineering Sciences [physics]/Civil Engineering/Infrastructures de transport ,Electrical conductance ,[ SPI.NRJ ] Engineering Sciences [physics]/Electric power ,0203 mechanical engineering ,Electrical resistance and conductance ,Electrical resistivity and conductivity ,0103 physical sciences ,General Materials Science ,Composite material ,Lubricant ,010306 general physics ,Shearing (physics) ,powder lubricant ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Contact resistance ,[ SPI.GCIV.DV ] Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations ,[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph] ,Discrete element method ,Electrical contacts ,[SPI.TRON]Engineering Sciences [physics]/Electronics ,[ SPI.TRON ] Engineering Sciences [physics]/Electronics ,Shear rate ,020303 mechanical engineering & transports ,Mechanics of Materials ,[SPI.GCIV.DV]Engineering Sciences [physics]/Civil Engineering/Dynamique, vibrations ,Discrete Element Method - Abstract
International audience; Recent developments in powder technology gave birth to a new lubricant – powder lubricant. Compared to liquid lubricant, powder lubricant like graphite powder has several advantages, such as good electrical conductivity and good thermal resistance. Such advantages are especially appreciated in sliding electrical contacts. Thus, the study of the electrical transmission ability of a shearing powder layer under different dy-namical constraints appears to have a great interest. Recent works allowed to model the coupling of mechanical and electrical effects in a discrete medium. This algorithm was extended to study the electrical properties of a shearing powder layer with Discrete Element Method. The mechanical and electrical behaviors of the sample were studied in different dynamical regimes, characterized by the inertial number I. The results exhibit an interesting relationship between the average contact resistance and the inertial number I. An exponential increase of the sample's electrical resistance as well as the induced electrical noise are observed closed to the dense flow limit. Such observations underline the fact that to ensure the electrical transmission ability of the powder layer, one must keep the particle size and shear rate small, and a sufficiently large pressure.
- Published
- 2016
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