Engineering tribology

Engineering tribology

ELSEVIER Journal of Materials ProcessingTechnology47 (1994) 199-200 Journal of Materials Processing Technology Book Review Engineering Tribology By...

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ELSEVIER

Journal of Materials ProcessingTechnology47 (1994) 199-200

Journal of Materials Processing Technology

Book Review Engineering Tribology By G.W. Stachowiak and A.W. Batchelor, Tribology Series Volume 24, published by Elsevier, Amsterdam, Netherlands, 1993, 899 pp., US $248.50, Dfl. 435.00, ISBN 0-444-89235-4 (hardback) Tribology is the study of the friction, wear and lubrication of interacting surfaces moving relative to each other. It is, as pointed out by the authors, one of the most interdisciplinary of all topics with inputs required from chemists, material scientists, engineers, physicists, mathematicians and so on. A proper understanding of the basic mechanisms involved in friction, wear and lubrication and the application of this understanding to the design and operation of machinery can lead to immense benefits as a result of reduced wear and energy consumption. The authors have noted that although there are a large number of specialised and descriptive books on tribology there is no book which gives a comprehensive coverage of engineering tribology and which emphasises the fundamentals of the processes involved. They have set out to rectify this position and have succeeded admirably. The book starts with an introductory chapter which gives an overview of what constitutes the subject of engineering tribology. Indications are given of the huge savings both in energy and as a result of enhanced component life which can result from the application of sound tribological principles. Chapters 2 and 3 consider the physical properties and composition of lubricants. The next five chapters cover the various lubrication regimes encountered in practice, viz. hydrodynamic, hydrostatic, elastohydrodynamic (including partial elastohydrodynamic and mixed) and boundary and extreme pressure lubrication. Chapter 5 shows how the use of numerical methods can remove the restrictive assumptions made in earlier applications of hydrodynamic lubrication theory and thus provide more realistic engineering solutions. In connection with this work a number of computer programs are given in an appendix. The remaining chapters are devoted to considering the mechanisms of friction and wear and methods by which these factors can be controlled. Chapter 9 considers the use of solid lubricants and surface treatments including wear-resistant coatings in combating wear and reducing friction. Chapter 10 looks at the deformation of surfaces and considers how the relevant surface topography can be characterised. Chapters 11-14 describe the most commonly encountered wear mechanisms including abrasion and adhesion, corrosion and oxidation and fatigue. Chapter 15 describes fretting and other less common wear mechanisms including diffusion which 0924-0136/94/$07.00 @ 1994 ElsevierScienceS.A. All rights reserved SSDI 0 9 2 4 - 0 1 3 6 ( 9 4 ) 0 1 4 3 B - 9

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G.W. Stachowiak, A.W. Batchelor / Journal of Materials Processing Technology 47 (1994) 199-200

is often the predominant tool wear mechanism in machining. The last chapter looks at the friction and wear of non-metallic materials. Anyone requiring a comprehensive understanding of the underlying concepts and theory of the different regimes of lubrication cannot do better than read this book. The same can be said for the chapters on friction and wear with the possible exception of the chapter on adhesion and adhesive wear about which some reservations must be expressed. Recent research work indicates that adhesion between contacting metallic surfaces is far less common than is usually assumed. This work suggests that rather than the frictional force resulting from the shearing of welded (adhered) asperity junctions it results from the pushing of waves of plastically deformed material in the softer surface ahead of asperities on the harder surface. For smooth well-lubricated surfaces wear then occurs by fatigue as a result of repeated wave passes across the surface. Somewhat surprisingly the authors have only made reference to this wave model of friction and wear in considering abrasive wear. The way in which the book has been written and laid out suggests that the authors are outstanding teachers. Concepts and theory are presented extremely clearly and supported by excellent diagrams and descriptions. Abundant references are given. The book can be highly recommended to all those engaged in researching and applying tribology. I know of no better book on this intriguing topic. P.L.B. Oxley

School of Mechanical and Manufizcturing Engineering The University of New South Wales Sydney 2052, Australia