Standard Handbook of Machine Design  2nd Ed  Shigley   Mischke  1996

Standard Handbook of Machine Design 2nd Ed Shigley Mischke 1996

Written by: The McGraw-Hill Companies

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  • Publisher: Bukupedia
  • Publish Date: 1996-07-26
  • ISBN-10:
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Book Summary

To the late Joseph Edward Shigley Joseph Edward Shigley was awarded bachelor degrees in electrical (1931) and mechanical (1932) engineering by Purdue University, and a master of science in engineering mechanics (1946) by The University of Michigan. His career in engineering education began at Clemson College (1936-1956) and continued at The University of Michigan (1956-1978). Upon retirement, he was named Professor Emeritus of Mechanical Engineering by the Regents in recognition of his outstanding achievement and dedicated service. At the time when Professor Shigley began thinking about his first book on machine design, many designers were unschooled, and textbooks tended to give results with only a brief explanation—they did not offer the reader many tools with which to proceed in other or new directions. Professor Shigley's first book, Machine Design (1956), showed his attention to learning and understanding. That milestone book is currently in its fifth edition. Other books followed, among which are Theory of Machines and Mechanisms (with John J. Uicker, Jr.), Mechanical Engineering Design (with Charles R. Mischke), and Applied Mechanics of Materials. Early in the 1980s, Professor Shigley called Professor Mischke and said, "I've never done a Handbook before; there is no precedent in machine design, and it is time there was one. I propose we do it together. Take a couple of months to consider what ought to be in it, the organization and presentation style. Then we can get together and compare notes." The result was the first edition of the Standard Handbook of Machine Design (1986), which won the Association of American Publishers Award for the best book in engineering and technology published in 1986. Eight Mechanical Designers Workbooks followed. Professor Shigley received recognitions such as the grade of Fellow in the American Society of Mechanical Engineers, from which he also received the Mechanisms Committee Award in 1974, the Worcester Reed Warner Medal in 1977, and the Machine Design Award in 1985. I believe he would have given up all the above rather than give up the effect he had as mentor and tutor to students, and in guiding boys toward manhood as a scoutmaster. He indeed made a difference. Charles R. Mischke PREFACE TO THE SECOND EDITION The introduction of new materials, new processes, and new (or more refined) analytical tools and approaches changes the way in which machines are designed. Complementary to the urge to update and improve, it is useful to look back in order to retain a perspective and appreciate how all this fits into the fabric of machine design methodology. Many of the machine elements we know today were known to the ancients. We have the advantage of improved materials, better manufacturing methods, and finer geometric control, as well as insightful theory and the opportunity to stand on the shoulders of the giants among our predecessors. Assuring the integrity of a contemplated design, its components, and the aggregate machine or mechanism has always been a problem for the engineer. The methods of record include the following: • The Roman method This method, developed in the Macedonia-Roman period, was to replicate a proven, durable design (with some peripheral improvements). Encyclopedic "books" were compiled for the guidance of designers. In strengthlimited designs, the essential thought was, "Don't lean on your element any harder than was done in the durable, extant designs of the past." There are times when contemporary engineers still employ this method. • The factor of safety method (of Philon of Byzantium) In today's terms, one might express this idea as loss-of-function load strength n = : —— = impressed load stress for linear load-stress relations. Alternatively, loss-of-function load Allowable load = n or AA lIlI owabuil e s^t ress = strength n for linear load-stress relations. The factor of safety or design factor was experiential and came to consider uncertainty in load as well as in strength. • The permissible stress method Since the concept of stress was introduced by Cauchy in 1822, some engineers have used the idea of permissible stress with load uncertainty considered, and later with the relevant material strength included, as for example in 0.405, < (aall)bending < 0.605, It is not clear whether the material strength uncertainty is included or not. When the word "allowable" or "permissible" is used among engineers, it is important to clearly define what is, and what is not, included. • Allowable stress by design factor The definition of allowable stress oan is expressed as strength °all = ~^n n

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