Engineering Mechanics of Composite Materials 2nd Edition
Writing this book and observing its widespread use and acceptance has been a very gratifying experience. We are very pleased and thankful for the many favorable comments we received over the years from colleagues around the world. Educators who used the book in their teaching of composite materials found it well organized, clear, and brief. Many of them offered valuable suggestions for corrections, revisions, and additions for this new edition.
After writing a textbook, one always thinks of ways in which it could be improved. Besides correcting some inevitable errors that appeared in the first edition, we wanted to revise, update, and expand the material in keeping with our teaching experience, the feedback we received, and the continuously expanding field of composite materials technology and applications.
This edition has been expanded to include two new chapters dealing with micromechanics. Materials in wide use today, such as textile-reinforced composites, are discussed in more detail. The database in the original Chapter 2 has been expanded to include more fabric composites, high-temperature composites, and three-dimensional properties, and it has been moved to an appendix for easier reference. A description has been added of processing methods since the quality and behavior of composite materials is intimately related to the fabrication process.
Chapter 3, a new chapter, gives a review of the micromechanics of elastic behavior, leading to the macromechanical elastic response of a composite lamina discussed in Chapter 4. Recognizing the current interest in three-dimensional effects, we included transformation relations for the three-dimensional case as well. Chapter 5 describes the micromechanics of failure, including failure mechanisms and prediction of strength. Chapter 6 is a treatment and discussion of failure of a composite lamina from the macromechanical or phenomenological point of view. An updated review and description of macromechanical failure theories is given for the single lamina. Basic theories discussed in detail include maximum stress, maximum strain, phenomenological (interaction) theories (Tsai-Hill and Tsai-Wu), and mechanistic theories based on specific single or mixed failure modes (Hashin-Rotem). Their extension to three dimensions and their application to textile composites are described. Comparisons with experimental data have been added for the unidirectional lamina and the basic fabric lamina. Chapter 7, which deals primarily with the classical lamination theory, has beenexpanded to include effects of transverse shear and application to sandwich plates. Except for some updating of data, few changes were made in Chapter 8, which describes hygrothermal effects. Chapter 9, which deals with stress and failure analysis of laminates has been revised extensively in view of the ongoing debate in technical circles on the applicability of the various failure theories. The discussion emphasizes progressive failure following first ply failure and evaluates the various theories based on their capability to predict ultimate laminate failure. Applications to textile composites are described, and comparisons between theoretical predictions and experimental results are discussed. Chapter 10 has been revised primarily by adding test methods for fabric composites and for determination of three-dimensional properties. The book retains the same overall structure as the first edition. New problems have been added in the Problem sections. We aimed to make this new edition more relevant by emphasizing topics related to current interests and technological trends. However, we believe that the uniqueness of this
book lies primarily in its contribution to the continuously expanding educational activityin the field of composites.
We have tried to accomplish all of the above revisions and additions without expanding the size of the book significantly. We believe in placing more emphasis on the macromechanics of composite materials for structural applications. We would like to acknowledge again, as with the first edition, the dedicated, expert, and enthusiastic help of Mrs. Yolande Mallian in typing and organizing the manuscript.
We would like to thank Dr. Jyi-Jiin Luo for his assistance with the preparation of new illustrations, the evaluation of the various failure theories, and the writing of a new comprehensive and user-friendly computer program for predicting the failure of composite laminates and Drs. Jandro L. Abot, Patrick M. Schubel, and Asma Yasmin for their help with the preparation of new and revised illustrations. The valuable suggestions received from the following colleagues are greatly appreciated: John Botsis, Leif A. Carlsson, Kathleen Issen, Liviu Librescu, Ozden 0. Ochoa, C. T. Sun, and George J. Weng.
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