... reducer, thorough comprehension of the reducer’s tribological behavior is required. To this end, the elastohydrodynamic lubrication (EHL) theory, for the first time, is used to reveal the tribological behavior of the planer ball reducer, and the equations of kinematics, EHL model, and theoretical...

... of elastohydrodynamic lubricated (EHL) lubricants compared to the conventional pressure–viscosity coefficient. Comparisons between simulated, curve-fitted values, and experimental results validate both the employed numerical approach and rheological model. EHL shear thinning Carreau point contact film...

... under lubrication environment. So far the numerical algorithms to solve lubrication problems without the consideration of inhomogeneities or inclusions are well developed. In this paper, the combination of elastohydrodynamic lubrication (EHL) and inclusion problem is realized to consider the effect...

...Li-Ming Chu; Chien-Yu Chen; Chin-Ke Tee; Qie-Da Chen; Wang-Long Li In the development of an EHL coated surfaces in point contact problem (Fig. 1 ), a modal problem is defined and analyzed in the following section. The modal problem consists of a rigid ball in contact with a smooth coated flat...

.... 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...

... lubricated (EHL) contact between a rolling element and raceways under wider load and speed ranges are analyzed numerically based on the transient EHL model and the free vibration model. The discrete convolution and fast fourier transform method is implemented in order to increase the computational efficiency...

...Li-Ming Chu; Jaw-Ren Lin; Wang-Long Li; Jian-Ming Lu The coupled extended Reynolds (which includes the effects of Navier-slip and flow rheology), elasticity deformation, and the load equilibrium (under a constant load condition) equations are solved simultaneously for the EHL problems. Results show...

...Dong Zhu; Q. Jane Wang Elastohydrodynamic Lubrication (EHL) is commonly known as a mode of fluid-film lubrication in which the mechanism of hydrodynamic film formation is enhanced by surface elastic deformation and lubricant viscosity increase due to high pressure. It has been an active...

...Yuchuan Liu; Q. Jane Wang; Dong Zhu; Wenzhong Wang; Yuanzhong Hu This paper discussed the computational accuracy of rough-surface point-contact isothermal elastohydrodynamic lubrication (EHL) analysis by investigating the effects of differential scheme, viscosity-pressure, and shear-thinning models...

...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...

...Punit Kumar; M. M. Khonsari; Scott Bair The Eyring sinh law, which is the most widely used model to describe the shear-thinning behavior of elastohydrodynamic lubrication (EHL) lubricants, fails to replicate the experimentally measured flow curves for shear-thinning lubricants. Interestingly...

... thin films EHL shear thinning Carreau point contact correction factor The accurate prediction of lubricant film thickness and traction coefficient in elastohydrodynamic lubrication (EHL) of nonconformal contacts has been the focus of attention for over the past five decades. Earlier...

... , P. , and Wang , J. , 2002 , “ Thermal Effects on the Film Thickness in Elliptic EHL Contacts With Entrainment Along the Major Contact Axis ,” ASME J. Tribol...

...Punit Kumar; M. M. Khonsari The combined influence of shear thinning and viscous heating on the behavior of film thickness and friction in elastohydrodynamic lubrication (EHL) rolling/sliding line contacts is investigated numerically. The constitutive equation put forward by Carreau is incorporated...

...-thinning across the film. For a CFD approach the shear-rate dependency can be expressed locally. In Eq. 28 the elastic component is dropped, as Bair et al. ( 35 ) have shown that a time dependency in the viscous response for an EHL-contact is unlikely. That leads to 29 γ ̇ = τ 0 η 0...

...Ilya I. Kudish; P. Kumar; M. M. Khonsari; Scott Bair The estimation or prediction of elastohydrodynamic lubrication (EHL) film thickness requires knowledge of the lubricant properties. Today, in many instances, the lubricant properties have been obtained from a measurement of the central film...

... in wavelength or the decrease in waviness amplitude, the cyclic solution can approach the steady-state solution gradually. Such a comparison also suggests that, in general, the existence of surface waviness is harmful to an EHL point contact, although it may be beneficial in a contact pair composed of two...

...) No reference values exist for cavity length. However, the calculated film thicknesses, even when using a large domain, agree with standard EHL film thickness formulas. Figure 8 shows lines of central film thickness calculated by the Hamrock and Dowson equation, as found in Hamrock ( 21 ) for the piezoviscous...

... and coating thickness on lubricant film thickness are investigated based on a point-contact isothermal elastohydrodynamic lubrication (EHL) model developed recently by the authors. The results present the trend of minimum film thickness variation as a function of coating thickness and elastic modulus under...

... polymer additives are often added to the base oil. This paper investigates the effect of mixture rheology on elastohydrodynamic lubrication (EHL) film thickness using EHL contact measurements and a full numerical analysis for three synthetic lubricants including two single-component lubricants PAO650...