By Siwei Zhang (auth.), Prof. Jianbin Luo, Prof. Yonggang Meng, Prof. Tianmin Shao, Dr. Qian Zhao (eds.)
"Advanced Tribology" is the complaints of the fifth China foreign Symposium on Tribology (held each 4 years) and the first overseas Tribology Symposium of IFToMM, held in Beijing 24th-27th September 2008. It includes seven elements: lubrication; friction and put on; micro/nano-tribology; tribology of coatings, floor and interface; biotribology; tribo-chemistry; tribology. The e-book displays the new development within the fields equivalent to lubrication, friction and put on, coatings, and precision manufacture and so on. within the world.
The ebook is meant for researchers, engineers and graduate scholars within the box of tribology, lubrication, mechanical creation and business design.
The editors Jianbin Luo, Yonggang Meng, Tianmin Shao and Qian Zhao are the entire professors on the nation Key Lab of Tribology, Tsinghua college, Beijing.
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Additional info for Advanced Tribology: Proceedings of CIST2008 & ITS-IFToMM2008
INTRODUCTION Friction is an archaic phenomenon that occurs everywhere between two relatively moved and contacted objects. During the last decades, fundamental studies of friction have been developed down to molecular and atomic level that has been called nanotribology. Micro/nano-tribology has been widely investigated with modern apparatuses as atomic force microscopy, atomic-force microscope, surface force apparatus, and quartz crystal microbalance to reveal tribological origins at molecular and atomic level.
WEAR AND FRICATION BEHAVIOR Friction and wear properties of the composites were investigated using a high temperature wear tester under dry conditions. 2. FRICTION MEASUREMENTS Fig. 1 shows the friction coefficient (μ) versus temperature for self-mated couples, respectively, of preform D, composite ‘D’, composite ‘G’, and composite ‘B’ specimens. At room temperature, the observed values of μ for composites were slightly lower than that of the preform. However, at higher temperatures, the three composites showed significantly low values of the friction coefficient compared to the preform.
Sample Sample grease grease where J is the shear strain and J is its amplitude, J the shear strain rate, and Z the angular speed of the oscillation. 6 with its amplitude W0 and the phase delay G. For a simplifying EHL formulation, an assumption is made that a generalized viscosity of the sample grease K* is defined by (3) K* W 0 / J 0 . 6. The clearance between a cone having 20mm diameter and 176° apex angle and a plate was filled with the sample grease. The cone was driven in a sinusoidal angular oscillation manner to give a uniform shear strain in the sample and the average torque over 5s transmitted to the plate was recorded to determine the shear stress.