WHAT EVERY REIIABIIITY RISK ANALYSIS WHAT EVERY ENGINEER SHOULD KNOW A Series Editor William H. Middendorf Department of Electrical and Computer Engineering University of Cincinnati Cincinnati, Ohio What Every Engineer Should Know About Patents, William G, Konold, Bruce Tittel, Donald F. Frei, and David S. Staiiard What Every Engineer Should Know About Product Liability, James F. Thorpe and William H. Middendorf 3. What Every Engineer Should Know About Microcomputers: Hardware/Software Design, A Step-by-Step Example, William S. Bennett and Carl F. Evert, Jr. What Every Engineer Should Know About Economic Decision Analysis, Dean S. Shape 5. What Every Engineer Should Know About Human Resources Management, Desmond D. Martin and Richard L Shell 6. What Every Engineer Should Know About Manufacturing Cost Estimating, Eric M. Malstrom 7. What Every Engineer Should Know About Inventing, William H. Middendorf 8. What Every Engineer Should Know About Technology Transfer and Innovation, Louis N. Mogavero and Robert S. Shane What Every Engineer Should Know About Project Management, Ar- nold M. Ruskin and W. Eugene Estes 10. What Every Engineer Should Know About Computer-Aided Design and Computer-Aided Manufacturing: The CAD/CAM Revolution, John K. Krouse 11. What Every Engineer Should Know About Robots, Maurice I. Zeldman 12. What Every Engineer Should Know About Microcomputer Systems Design and Debugging, Bill Wray and Bill Crawford 13. What Every Engineer Should Know About Engineering Information Resources, Margaret T. Schenk and James K. Webster 14. What Every Engineer Should Know About Microcomputer Program Design, Keith R. Wehmeyer 15. What Every Engineer Should Know About Computer Modeling and Simulation, Don M. Ingels 16. What Every Engineer Should Know About Engineering Workstations, Justin £. Harlow III 17. What Every Engineer Should Know About Practical CAD/CAM Appli cations, John Stark 18. What Every Engineer Should Know About Threaded Fasteners: Materials and Design, Alexander Blake 19. What Every Engineer Should Know About Data Communications, Carl Stephen Clifton 20. What Every Engineer Should Know About Material and Component Failure, Failure Analysis, and Litigation, Lawrence E. Murr 21. What Every Engineer Should Know About Corrosion, Philip Schweitzer 22. What Every Engineer Should Know About Lasers, D. C. Winburn 23. What Every Engineer Should Know About Finite Element Analysis, edited by John R. Brauer 24. What Every Engineer Should Know About Patents: Second Edition, William G. Konold, Bruce Tittel, Donald F. Frei, and David S. St aliará 25. What Every Engineer Should Know About Electronic Communications Systems, L. R. McKay 26. What Every Engineer Should Know About Quality Control, Thomas Pyzdek 27. What Every Engineer Should Know About Microcomputers: Hardware/ Software Design, A Step-by-Step Example. Second Edition, Revised and Expanded, William S. Bennett, Carl F. Evert, and Leslie C. Lander 28. What Every Engineer Should Know About Ceramics, Solomon Musikant 29. What Every Engineer Should Know About Developing Plastics Products, Bruce C. Wendle 30. What Every Engineer Should Know About Reliability and Risk Analysis, M. Modarres ADDITIONAL VOLUMES IN PREPARATION WHinr EVERY REUABIUTY RISK ANAIYSIS M . M odarres Center for Reliability Engineering University of Maryland College Park, Maryland CRC Press Taylor &. Francis Group Boca Raton London New York CRC Press is an imprint of the Taylor & Francis Group, an informa business Library of Congress Caialoging-in-Publication Data Modarres, M. (Mohammad) What every engineer should know about reliability and risk analysis / M. Modarres p. cm. — (What every engineer should know about; v. 30) Includes bibliographical references and index. ISBN 0-8247-8958-X 1. Reliability (Engineering) 2. Risk assessment. I. Title. II. Title: Reliability and risk analysis. III. Series. TA169.M63 1993 620’ .00452~dc20 92-32998 CIP This book is printed on acid-free paper. Copyright © 1993 by MARCEL DEKKER All Rights Reserved, Neither this book nor any part may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, micro filming, and recording, or by any information storage and retrieval system, without permission in writing from the publisher. MARCEL DEKKER 270 Madison Avenue, New York, New York 10016 Current printing (last digit): 10 9 8 7 6 PRINTED IN THE UNITED STATES OF AMERICA To my wife, Susan, for her patience and understanding. And to my son, Ceena. The quest for certainty blocks the search for meaning. Uncertainty is the very condition to impel man to unfold his powers. Erich Fromm, Man for Himself (1947) Preface This book provides an introduction to reliability and risk anal ysis, both for engineering students at the undergraduate and grad uate levels, and for practicing engineers. Since rehability analysis is a multidisciphnary subject, the scope is not limited to any one engineering discipline; rather, the material is applicable to most en gineering disciphnes. I developed the contents of this book from material I presented over the last 10 years in undergraduate and graduate-level courses in Rehabihty Analysis and Risk Assessment that I have been teaching at the University of Maryland. The book presents basic and advanced methods in rehabihty analysis that are commonly used in practice. The book presents these methods along with a number of examples. The emphasis of the book is the introduction and explanation of the practical methods used in rehabihty, and risk studies, and discussion of their use and hmitations. These methods cover a wide range of topics that are used in routine engineering activities. The book assumes that the readers have httle or no background in prob- abihty and statistics. Thus, an introductory chapter (Chapter 1) defines rehabihty, availability and risk analysis, and Chapter 2 pro vides review of probabihty and statistics essential to understanding of the rehabihty methods discussed in the book. I have structured the book so that basic rehabihty methods are described first in Chapter 3 in the context of a basic engineering unit (i.e., a component). Next, in Chapter 4 these analytical methods are described in the context of a more complex engineering unit (i.e., a system containing many interacting components). The material in Chapters 1 through 4 are more appropriate for an undergraduate course in rehabihty engineering. The availability concept and rehabihty considerations for re pairable systems are discussed in Chapter 5. This chapter also ex plains the corresponding use of the analytical methods discussed in the earher chapters when performing availabihty analysis of com
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