..., this study employs a validated explicit finite element (FE) method to evaluate the transient wheel-rail rolling/slipping contact behaviors. The contact during the traction of the wheel from both standstill status and moving status is focused. Friction and traction coefficients are the two most crucial...

.... 29 05 2013 24 11 2013 This paper addresses a largely ignored aspect pertaining to the elastohydrodynamic lubrication (EHL) traction behavior of fragile lubricants which undergo transition to glassy state at typical EHL contact zone pressures. For such lubricants, a conventional EHL...

... elastohydrodynamic lubrication point contact spinning film thickness traction non-Newtonian behavior complex kinematics shear stress distribution In numerous mechanical systems, for instance in the flange-roller end contacts in roller bearings or in variable traction drive systems, a spinning motion...

... complete rotation of the spirally grooved roller, the traction coefficient between the web and the roller changes with time due to the changing shape of the groove in the contact region, and the average traction coefficient of the circumferentially grooved roller is higher than that of the spirally grooved...

...Punit Kumar; M. M. Khonsari This paper investigates the traction behavior in heavily loaded thermo-elastohydrodynamic lubrication (EHL) line contacts using the Doolittle free-volume equation, which closely represents the experimental viscosity-pressure-temperature relationship and has recently...

... . Lakshmikumaran , A. V. , and Wickert , J. A. , 1999 , “ Equilibrium Analysis of Finite Width Tension Dominated Foil Bearings ,” ASME J. Tribol. 0742-4787 , 121 , pp. 108 – 113 . Ducotey , K. S. , and Good , J. K. , 1999 , “ Predicting Traction in Web Handling ,” ASME J. Tribol...

...Yasuyoshi Tozaki; Akihiko Umeda; Hiroyuki Sonobe; Susumu Matsumoto; Takeshi Yoshimi; Isamu Shiotsu Traction drive makes oil film between two rollers, and power is transmitted by oil film shearing. It has the following characteristics. (1) Traction drive can be operated at low level of vibration...

... to determine the surface temperatures in lubricated contacts. Crook ( 9 ) developed an analysis to estimate temperature rise in rolling/sliding contacts in order to assess the effect on film thickness and traction, and surface temperatures were calculated based...

...Brian S. Rice; Roger F. Gans, Member, ASME We studied the traction developed between a thin, flexible web and a rotating circumferentially grooved cylindrical roller. We have developed a new two-dimensional analytic model that couples air film pressure, web deflection, and asperity contact...

...Sinan Mu¨ftu¨, Associate Professor, Mem. ASME; John J. Jagodnik, Graduate Student Web traction over rollers is known to deteriorate due to air entrainment at high web speeds. In this paper, a general model is presented to predict the traction capability of an impermeable web over a smooth roller...

...) mechanical contact sliding friction elasticity vibrations stress analysis integral equations traction Fretting is a frictional contact phenomenon that leads to damage at the contact region between two nominally-clamped surfaces subjected to oscillatory motion of small amplitudes. The contact...

...K. J. Sharif; H. P. Evans; R. W. Snidle; J. P. Newall The paper describes the application of a full non-Newtonian, thermal elastohydrodynamic lubrication (EHL) model for the prediction of film thickness and viscous traction force in a special high speed rolling traction rig. The primary objective...

...Brian S. Rice; Kevin A. Cole; Sinan Mu¨ftu¨ The traction developed between a thin flexible web, wrapped around a non-vented, rotating cylindrical roller is studied experimentally and theoretically. A series of eight webs representing a wide range of surface roughness characteristics are traction...

...Xiaolan Ai A novel design of planetary tapered roller traction drive was described. The design eliminated the spin motion induced sliding, offering high mechanical efficiency and improved wear performance. Principles of performance calculation have been outlined. Torque and life calculations...

...Xiaolan Ai A tapered roller planetary traction drive based on a so-called zero-spin design was built for performance evaluation. The traction drive demonstrated, in many aspects, superb performance characteristics. The zero-spin design increased the torque capacity and enabled the traction drive...

...K. S. Ducotey; J. K. Good Air entrainment can become a significant problem in a web handling process line. The development of an air film between a roller and web can cause a reduction in traction. This can cause a velocity difference between the web and roller and may also cause guiding problems...

... frictional sliding with given values of the friction coefficient, materials constants, and sliding velocity, the dependence of the contact zone length on the remotely applied tractions is determined. The results indicate a decrease of the minimum applied traction required to close the gap between the bodies...

... system is solved using a modified Newton-Raphson algorithm. The traction characteristics of the web are presented for different porosity levels, asperity height, and compliance. [S0742-4787(99)00102-8] In the regular foil bearing problem, the length of the entry and exit regions, L e...