...Yinhu Xi; Bo Li; Andreas Almqvist In this work, a semi-analytical model replicating 3D rolling contact problems with elastic coating layers has been proposed. The dimension reduced boundary element based model rests on the conventional half-space assumptions, with influence coefficients describing...

... arrangement Schematic diagram of the experimental apparatus: (a) overall schematic diagram of device and (b) droplet arrangement Fig. 11 Interferograms and midsection film thickness profiles during first cycle under pure rolling reciprocating motion ( T = 0.48 s, L = 0.516 mm, without water...

...Ken Takahashi; Takafumi Nagatomo The calculating method for fatigue life of rolling bearings is based on the theory of Lundberg and Palmgren. The rated life is determined from the ratio of the dynamic load rating of the bearing to the dynamic equivalent load. However, in actual applications...

... in the load free zone. For the MC clearance, the polyamide cage showed better behavior (less roller and rolling set slip tendency) than the brass cage contrasting the results obtained earlier under the EC clearance. It is concluded that the polyamide cage deforms under the unsymmetrical loading of the EC...

... experienced very mild alterations probably during the wear-in phase of the tests with no signs of seizure to be seen. The inner rings of both bearings have a similar fully crowned profile, while the rolling element is partially crowned. The outer ring has a very minute profile extending only 1 µ m...

... slip speed Temperature rising Decreases temperature Thins oil film Increases pressure Reduces contact area Strength falls Averages pressure distribution Rises pressure at only low load To make the oil film thinner, fine grooves parallel to the rolling direction...

... surfaces are meshed much more finely than other areas. A grid independence study has also been performed to discover that the variation in the solution can be neglected when the cover is divided into a total of 47,120 solid elements. A cylindrical ring whose size is the same as the rolling bearing...

... for measurement of the power losses of rolling-element bearings. Sets of measurements taken by using the same example ball bearings are compared with those predicted by the model to assess its accuracy in predicting mechanical power loss of a ball bearing within wide ranges of axial and radial forces. Email...

...Zhuang Chen; Guanci Chen The motions between the ball and raceway in a ball bearing involve rolling, gyroscopic, and spin slide. These complex motions result in the serious distribution of the friction force. Based on the contact mechanics in tribology, the friction force greatly affects stress...

.... , Zhang , H. , and Wang , Z. , 2011 , “ Experimental Research on the Dynamic Stiffness of Rolling Guide’s Joint ,” Mach. Des. Manuf. , 49 ( 12 ), pp. 115 – 117 . [5] Kai , Y. , Fukuta , M. , Matsubara , A. , and Kono , D. , 2013 , “ Dynamic Characteristics of Ultra...

...Nguyen Hoa Ngan; Philippe Bocher The objective of this research is to conduct a finite element analysis to better understand the effects of induction hardening on rolling contact fatigue (RCF). The finite element analysis was developed in three-dimensional to estimate the maximal loading...

..., while the ball was made from rubber and the disk was from optical glass. The contact was lubricated by glycerol and polyglycol to examine the effect of fluid viscosity. The measurements were conducted under pure rolling and rolling/sliding conditions. The entrainment speed varied from 10 to 400 mm/s...

.... 03 07 2017 24 12 2017 Gas bearings Rolling Seals Wear and leakage increase dramatically when the mechanical seals run under severe conditions. Enhancing the performance of mechanical seals is of great significance to high durability and reliability of modern machines...

...Jian Wang; Qingliang Wang; Xiao Zhang; Dekun Zhang The coupled impact and rolling wear behavior of the medium-manganese austenitic steel (Mn8) were studied by comparison with the traditional Hadfield (Mn13) steel. Scanning electron microscopy (SEM), X-ray diffractometer (XRD), and transmission...

... applied to rolling friction control under various external magnetic strengths is conducted. To accomplish this, the rolling friction property of an elastomer on a rigid plate is analyzed. Then, MREs are prepared, and a rolling friction tester is designed to evaluate the changes in the rolling friction...

... 1 τ 1 ( x , y , t ) d x d y The contact region of the ball–ring pair is shown in Fig. 5 . The contact zoom is in elliptical shape, the contact stress is GPa lever by the Hertz contact theory, and the sliding–rolling feature is much smaller than that of the ball...

... are conducted. Tests are performed at low speeds and various loading conditions. Friction sources are decoupled and examined separately in order to fully understand effect of each component on friction torque of the slewing bearing. Therefore, friction caused by rolling motion and friction caused by two...

...Andreas Draganis A theoretical and computational framework for the analysis of fully transient, thermomechanically coupled, frictional rolling contact based on an arbitrary Lagrangian–Eulerian (ALE) kinematical description is presented. In particular, a computationally efficient methodology...

... contacts. In many cases, debris dents appear with shoulders raised above the original surface. Material piling-up this way causes high-pressure spikes when dents are over-rolled by an element such as a ball in a rolling bearing. This study introduces an approximate analytical method based on the so-called...

...: James R. Barber. 31 10 2014 22 04 2015 09 07 2015 Spin in frictional rolling contact can cause significant stress, which is the key to understanding and predicting the wear and fatigue behavior of contact components, such as wheels, rails, and rolling bearings. The lateral...