By Giovanni Straffelini
This booklet introduces the fundamental suggestions of touch mechanics, friction, lubrication, and put on mechanisms, delivering simplified analytical relationships which are beneficial for quantitative checks. for this reason, an summary at the major put on methods is equipped, and directions at the best suited layout ideas for every particular program are defined. the ultimate a part of the textual content is dedicated to an outline of the most fabrics and floor remedies particularly built for tribological functions and to the presentation of tribological platforms of specific engineering relevance. The textual content is brand new with the newest advancements within the box of tribology and gives a theoretical framework to give an explanation for friction and put on difficulties, including useful instruments for his or her solution. The textual content is meant for college students on Engineering classes (both bachelor and grasp levels) who needs to enhance a legitimate figuring out of friction, put on, lubrication, and floor engineering, and for technicians or pros who have to remedy tribological difficulties of their work.
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Extra info for Friction and Wear: Methodologies for Design and Control
28 was obtained . 2 (due to the solid lubricating action of graphite). 4 Final Remarks In this section, the adhesive theory of friction, as expressed by Eqs. 10b, have been used to explain the typical values of friction coefﬁcient in metals, ceramics and polymers. No lists of friction coefﬁcients have been reported herewith, since friction is a system property that strongly depend on the sliding conditions . We have introduced the role of oxidation (with the formation of a friction layer), roughness, material transfer phenomena, applied load, thermal heating and so forth.
In polymers that are 100 % crystalline, friction coefﬁcient remains almost constant up to their melting temperature. Ceramic materials are characterised by melting temperatures much higher than those of polymers and metals and therefore they are able to maintain a relatively low coefﬁcient of friction up to temperatures of about 1000 °C. The temperature dependence of friction coefﬁcient depicted in Fig. 21 for a sintered alumina (with a hardness of about 1500 kg/mm2) is quite typical of most ceramics (including nitrides and carbides).
L. Mittal, Fundamentals of Adhesion and Interfaces, VSP (1995) 18. E. Rabinowicz, Friction and Wear of Materials, 2nd edn. (Wiley, New York, 1995) 19. H. H. Habig, Tribologie Handbuch, Reibung und Verlschleiss (Vieweg, Braunschweig, 1992) 20. L. Johnson, Mechanics of adhesion. Tribol. Int. 31, 413–418 (1998) 21. M. Benedetti, D. Bortoluzzi, M. Da Lio, V. Fontanari The influence of adhesion and subnewton pull-off forces on the release of objects in outer space. Trans. ASME 128, 828–840 (2006) 22.