CONTACT FATIGUE is a surface-pitting-type failure commonly found in ball or roller bearings. This type of failure can also be found in gears, cams, valves, rails, and gear couplings. Contact fatigue has been identified in metal alloys (both ferrous and nonferrous) and in ceramics and cermets. Contact fatigue differs from classic structural fatigue (bending or torsional) in that it results from ...

A multisurface glass roller bottle has been constructed for the growth of animal cells in culture. This bottle contains five concentrically placed glass cylinders that provide additional surfaces for the growth of animal cells. The bottle occupies the same space as a standard roller bottle, but it contains nine times the surface area of a standard bottle. L and HeLa cells can be grown in the bo...

The suitable preload design of cylindrical roller bearing with triple-lobe raceway can avoid effectively sliding damage. To realize the characteristics analysis bearing, quasi-static numerical model is established and solved by improved Newton-Raphson method. Taking a as an example, effects mounting radial clearance, outer waveform value, load rotational speed on maximum contact are analyzed. r...

Roller friction bearings are widely used in machine-building, they one of the most loaded parts. Studying their wear resistance allows to optimize process exploitation, which increases reliability mechanisms general. The purpose study is determine effect load on slip real rolling friction. Materials and methods research: mechanism slipping, we model form a linear contact two disks, pressed agai...

The rolling element bearing is a key part in many mechanical equipment. The accurate and timely diagnosis of its faults is critical for predictive maintenance. Vibration signals from a defective bearing with a localized fault contain a series of impulsive responses, which result from the impacts of the defective part(s) with other elements and inevitable noise. Most researches carried out have ...

The rolling element bearing is a key part of machines. The accurate and timely diagnosis of its faults is critical for predictive maintenance. Most researches have focused on the fault location identification. To estimate the fault severity accurately, this paper focuses on the study of roller bearing vibration amplitude under increasing radial clearances due to inevitable wear using the modula...