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### PREFACE:

Composite materials is truly an interdisciplinary subject, and the number of students taking courses in this area is steadily increasing. Books on the subject tend to emphasize either the mechanics or the materials science aspects of composites. Principles of Composite Material Mechanicsis mechanics oriented.

Composite materials technology is new enough for many working engineers who have had no training in this area, and so, a textbook in composite material mechanics should be useful not only for the education of new engineers, but also for the continuing education of practicing engineers and for reference.

The high level of interest in composite materials, the interdisciplinary nature of the subject, the need to reeducate practicing engineers, and the need for a new composite mechanics textbook at the introductory level all led to my decision to write this book. Chapters 1 through 7 form the basis of a one-semester senior/graduatelevel course in mechanical engineering, which I have taught for the last 15 years. Chapters 8 through 10, along with selected papers from technical journals and student research projects/presentations, form the basis of a second one-semester course, which is taken only by graduate students, and which I have taught for the last 4 years.

The book could also be the basis for a twoquarter sequence by omitting some topics. The prerequisites for the course are knowledge of mechanics of materials, introduction to materials engineering, and ordinary differential equations, and the previous exposure to linear algebra is highly desirable. For some of the graduate-level material, earlier courses in advanced mechanics of materials, elasticity, and partial differential equations are recommended, but not required.

Some of the basic elements of composite mechanics covered in this book have not changed since the first books on the subject were published in the 1960s and 1970s, and, where possible, I have tried to use the accepted terminology and nomenclature. For example, the coverage of stress–strain relationships and transformation of properties for anisotropic materials in Chapter 2 and the classical lamination theory in Chapter 7 is consistent with that of the previous textbooks such as the Primer on Composite Materialsby Ashton, Halpin, and Petit, and Mechanics of Composite Materialsby Jones.

However, rather than beginning the study of laminates by jumping directly into classical lamination theory, I have concluded that a better pedagogical approach is to first introduce the basic laminate concepts by using the simpler theory of laminated beams in pure flexure. Also, I believe that the concept of an effective modulus of an equivalent homogeneous material, which had previously been covered only in advanced books such as Mechanics of Composite Materialsby Christensen, is essential for the proper development of heterogeneous composite micromechanics.

Thus, effective modulus–concepts are emphasized from their introduction in Chapter 2 to their use in the analysis of viscoelastic and dynamic behavior in Chapter 8. Although many basic concepts have been presented in the earlier textbooks, numerous new developments in composite mechanics over the last two decades have made it increasingly necessary to supplement these books with my own notes. Thus, I have an added coverage of important topics such as hygrothermal effects in Chapter 5, discontinuous fiber composites in Chapter 6, viscoelastic behavior and dynamic behavior in Chapter 8, fracture in Chapter 9, and mechanical testing in Chapter 10.

The coverage of experimental mechanics of composites has been expanded to include summaries of the most important ASTM standard test methods, many of which did not exist when the early mechanics of composites books were published. A variety of example problems and homework problems, a number of them related to practical composite structures, are also included.

The contents of this book represent the cumulative effects of more than 25 years of interactions with colleagues and students, and I would be remiss if I did not mention at least some of them. My fascination with composites began in 1965 with my first engineering position in what is now a part of Oak Ridge National Laboratory in Tennessee, where I was involved in the design and development of a high-speed rotating equipment.

At that time, I realized that the advantages of using composites in a rotating equipment are numerous, as is the case in many other applications. My experiences working with Dean Waters and other colleagues in the mechanical development group in Oak Ridge have had a strong influence on my later career decision to emphasize composites research and education.

My doctoral research on vibration-damping characteristics of composites with Robert Plunkett at the University of Minnesota further cemented my desire to continue working in the composites area and ultimately led to my career in university teaching and research. After beginning my academic career at Iowa State University in 1975, I began a long and productive association with C.T. Sun, and later had the pleasure of spending a 1-year leave working with C.T. and his colleagues Robert Sierakowski and Shive Chaturvedi at the University of Florida. I owe much of my understanding of composite mechanics to interactions with them.

The notes leading to this book were developed by teaching composite mechanics courses at Iowa State University, the University of Idaho, the University of Florida, Michigan State University, and Wayne State University (WSU), and I am indebted to the students who took my classes and helped me to “debug” these notes over the years. Most recently, my students at WSU have been particularly effective at finding the inevitable errors in my notes. Interaction with my graduate students over the years has immeasurably contributed to my understanding of composite mechanics, and the work of several of those students has been referred to in this book. I am particularly indebted to Stalin Suarez, Lyle Deobald, Raju Mantena, and Jimmy Hwang, all former graduate students at the University of Idaho.

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