By Ming Qiu, Long Chen, Yingchun Li, Jiafei Yan
By concentrating on the speculation and strategies of tribological layout and checking out for bearings, this ebook systematically reports the most recent advances in functions for this box. It describes complicated tribological layout, concept and techniques, and offers useful technical references for investments in bearing layout and production. The theories, tools and instances during this publication are mostly derived from the sensible engineering event received and examine performed through the writer and her workforce because the 2000s. The booklet comprises educational papers, technical reviews and patent literature, and provides a helpful consultant for engineers all in favour of bearing design.
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Additional resources for Bearing Tribology: Principles and Applications
In Britain and the Soviet Union two schools have been established successively. The former is known as the adhesion theory, and the latter is famous for binomial theorem of tribology. These theories established the foundation of modern solid friction theory. 3 Adhesion Friction Theory 1. Simple adhesive theory Simple adhesion theories mentioned by Bowden et al. (in 1945) can be summarized as follows: 44 3 Mechanism of Bearing Friction and Wear Fig. 3 Contact state for frictional surfaces (1) Friction surfaces were in the plastic contact state The real contact area is just a small part of apparent contact area, so the contact pressure of the asperity contact has been found to approach the yield strength σs, and will cause plastic deformation under the load.
So the contact area is composed of two parts: one is a cylinder for the area of adhesion effect and the shear is caused during sliding, the other is the end surface for the area of plowing effect. The soft materials are pushed by hard peaks. So the friction force F is F ¼ T þ Pe ¼ Asb þ Spe ð3:9Þ where T is shear stress, T ¼ Asb ; Pe is plowing force, Pe ¼ Spe ; A is adhesive area, namely, real contact area, sb is shear strength of adhesive junctions, S is plowing area, pe is plowing force of unit area.
The adhesive junctions have strong adhesive force. Then adhesive junctions are sheared to be sliding under the friction condition. Therefore, the sliding friction is an alternating process between formation of adhesive junctions and shear. 4 shows the measuring value of friction coefﬁcient during sliding between steels, where the friction coefﬁcient change indicates the stick-slip motion of sliding friction. Experimentally the change degree of adhesive time and friction coefﬁcient should decrease as sliding speed increases, so the friction coefﬁcient and sliding process will become smooth and steady.