tribology in machine design pdf

reasingly important role played by tribology at the design stage in engineering. It shows how algorithms developed from the basic principles of tribology can be used in a range of practical applications. The book is planned as a comprehensive reference and source book that will not only be useful to practising designers, researchers and postgraduate students, but will also find an essential place in libraries catering for engineering students on degree courses in universities and polytechnics. It is rather surprising that, in most mechanical engineering courses, tribology –
or at least the application of tribology to machine design – is not a compulsory subject.

This may be regarded as a major cause of the time-lag between the publication of new findings in tribology and their application in industry. A further reason for this time-lag is the fact that too many tribologists fail to present their results and ideas in terms of principles and concepts that are directly accessible and appealing to the design engineer.

It is hoped that the procedures and techniques of analysis explained in this book will be found helpful in applying the principles of tribology to the design of the machine elements commonly found in mechanical devices and systems. It is designed to supplement the Engineering Science Data Unit (ESDU) series in tribology (well known to practising engineers), emphasizing the basic principles, giving the background and explaining the rationale of the practical procedures that are recommended.

On a number of occasions the reader is referred to the appropriate ESDU item number, for
data characterizing a material or a tribological system, for more detailed guidance in solving a particular problem or for an alternative method of solution.

The text advocates and demonstrates the use of the computer as a design tool where long, laborious solution procedures are needed.The material is grouped according to applications: elements of contact mechanics, tribology of lower kinematic pairs, tribology of higher kinematic pairs, rolling contact bearings and surface damage of machine elements. The concept of tribodesign is introduced in Chapter 1. Chapter 2 is devoted to a brief discussion of the basic principles of tribology, including some new concepts and models of lubricated wear and friction under complex kinematic conditions. Elements of contact mechanics, presented in Chapter 3, are confined to the most technically important topics.

Tribology of lower kinematic pairs, sliding element bearings and higher kinematicpairs are discussed in Chapters 4,5 and 6, respectively. Chapter 7 contains a discussion of rolling contact bearings with particular emphasis on contact problems, surface fatiguand lubrication techniques. Finally, Chapter 8  concentrates on lubrication and surface failures of involute gears.