Kazuyuki Yagi

TL;DR: In this article, an experimental study on dimple formation under elastohydrodynamic lubrication (EHL) conditions was conducted, where the oil film thickness between a ball surface and a glass disk was measured using optical interferometry and the temperatures of both the surfaces and of the oil averaged across it were measured using an infrared emission technique.

TL;DR: In this article, a novel in situ observation method associated with synchrotron radiation X-ray diffraction (XRD) was developed to simultaneously monitor structural changes of materials, images at frictional interfaces, friction force and temperature with a time resolution on the order of tens of milliseconds.

TL;DR: In this article, the authors describe an in situ observation of the scuffing process of steel by means of a newly developed system that employs a combination of two-dimensional detector synchrotron X-ray diffraction (XRD), a near-infrared CCD array, and a visible camera.

TL;DR: In this article, a direct observation of a point contact area between a rotating sapphire disc and a stationary steel ball was conducted to understand the scuffing phenomenon, and it was found that wear debris produced in the contact area played an important role in the wear process.

TL;DR: In this paper, the authors proposed a balancing wedge action based on hydrodynamic lubrication theory for textured surfaces, which is based on the promotion of a wedge film action between surfaces by the incorporation of a textured feature.