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01/24/2006 -
Mechanical Wear Fundamentals and Testing: Second Edition, Revised and Expanded (2005)
by Raymond G. Bayer
ISBN 0-8247-4620-1. Marcel Dekker, New York. 2004. Hardcover. 399 pages. $189.95.
For the second edition of the work, the author has reduced the span and expanded the depth of coverage from the first edition. The book is divided into two sections: Fundamentals and Testing. The complete exposition will be provided in a second volume on the topic of design for wear.
In Part A on fundamentals, the author defines wear as progressive damage to a surface caused by relative motion with respect to another surface. Thus defined as damage rather than material attrition, wear includes not only material loss from abrasion, but also material deformation such as from repeated hammering, particle-induced erosion, and cracking or crazing from environmental exposure. Loss of optical transparency of lenses and aircraft windows is cited as an example of this mode of wear.
After a brief introduction where the terminology and classifications of wear are defined, nearly half of the book is devoted to discussions on the various wear mechanisms. The classifications include adhesion, abrasion, single-cycle deformations that result from the penetration of a softer body by a harder body (plowing, cutting, microcracking), and repeated cycle deformation. Here, damage by sub-surface Hertizian contact, or spalling, is included in the definition of wear. Also discussed as wear is oxidation of a surface and the progression of damage that results from the periodic removal of the oxide and its reformation. Damage caused by heating a surface by friction is presented as thermal wear.
Wear maps that may be used to characterize various aspects of wear behavior in terms of independent operational parameters of the tribosystem are introduced. In the final chapters of the mechanism section, discussions on general behavior and in-depth expositions on the key topics of galling and fretting may be found.
Throughout the book, the principles being explained are illustrated with exceptionally clear line drawings, appropriate mathematical formulations and with a large number of excellent scanning electron micrographs.
Part B focuses on the selection and use of wear tests. The author makes the point that wear testing does not define or measure a fundamental or intrinsic material property because wear resistance is not a material property but a materials system property. Therefore, there exist a large variety of "standard" wear tests in literature and the rankings of materials can vary considerably depending on the mode or modes of wear that are induced. The material here can serve as a guide to anyone confronted with the need to develop data for a design situation.
The book provides an excellent reference for materials engineers and designers who may be confronted with wear problems in design. It would also serve as a graduate or senior-level text in a materials science course on wear.
For more on Mechanical Wear Fundamentals and Testing: Second Edition, Revised and Expanded, visit the Taylor & Francis/CRC Press web site.
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