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[资源] Dynamic fracture mechanics

PREFACE

This book is an outgrowth of my involvement in the field of dynamic
fracture mechanics over a period of nearly twenty years. This sub-
branch of fracture mechanics has been wonderfully rich in scope and
diversity, attracting the attention of both researchers and practition-
ers with backgrounds in the mechanics of solids, applied mathematics,
structural engineering, materials science, and earth science. A wide
range of analytical, experimental, and computational methods have
been brought to bear on the area. Overall, the field of dynamic
fracture is highly interdisciplinary, it provides a wealth of challenging
fundamental issues for study, and new results have the potential for
immediate practical application. In my view, this combination of
characteristics accounts for its continued vitality.
I have written this book in an effort to summarize the current
state of the mechanics of dynamic fracture. The emphasis is on
fundamental concepts, the development of mathematical models of
phenomena which are dominated by mechanical features, and the
analysis of these models. Mathematical problems which are repre-
sentative of the problem classes that comprise the area are stated
formally, and they are also described in common language in an
effort to make their features clear. These problems are solved using
mathematical methods that are developed to the degree required to
make the presentation more or less self-contained. Experimental and
computational approaches have been of central importance in this
field, and relevant results are cited in the course of discussion. The
extraordinary contributions of the few individuals who pioneered the
area of dynamic fracture mechanics occupy prominent positions in this
discussion. One hope in preparing this book is that people with new
perspectives will be attracted to the field, which continues to provide
fascinating and technically important challenges. Perhaps the book
can serve as a guide to further development of the area.
The reader is assumed to be familiar with concepts of continuum
mechanics and methods of applied mathematics to the level normally
provided through the first year of study in a graduate program in
solid mechanics in the United States. A brief summary of relevant
results is included in the first chapter in order to establish notation
and to provide a common source for reference in later chapters. Some
background in equilibrium fracture mechanics would be helpful, of
course, but none is presumed. In terms of graduate instruction in
fracture mechanics, the book could serve as a text for a course devoted
to dynamic fracture mechanics or, for a more general course, as a
supplement to other books which provide broader coverage of the
whole of fracture mechanics. The overall organization of the book
is evident from the chapter titles. The brief overview included in
Chapter 1 can serve as a guide to those readers interested in using
the book as a source of reference for specific results.
The bibliography is an important part of the book. In view of
contemporary publication practices, the compilation of an all-inclusive
bibliography in any technical area is an impossible task. Nonetheless,
the bibliography is intended to be comprehensive in the sense that it
includes entries which describe research results on essentially all as-
pects of dynamic fracture. With only a few exceptions, the entries are
either articles published in the open literature or relevant textbooks
and monographs. Thus, most of the references should be available in
a reasonably complete technical library. All references cited in the
text are included in the bibliography, and many additional references
are included as well. Some judgment was required in the selection
of references for citation in the text, and I have done my best to
accurately identify sources for key steps in the evolution of ideas.
I am indebted to a number of colleagues who read drafts of
various chapters of the book. Those who offered suggestions and
encouragement in this way are John Hutchinson, Fred Nilsson, Ares
Rosakis, and John Willis. A special thanks goes to Jim Rice, Editor
of this series, who generously read a draft of the entire manuscript.
It has been among my greatest fortunes to be a member of the Solid
Mechanics Group at Brown University, which has provided an intellec-
tually stimulating and most congenial environment over the years. I
am especially grateful to my colleagues Rod Clifton, Alan Needleman,
Michael Ortiz, Fong Shih, and Jerry Weiner for their willingness to
read and discuss some of the material that is included here. My
own views on the mechanics of dynamic fracture and its fundamen-
tal precepts have been formed over a long period of time through
interactions with people far too numerous to mention individually.
This group includes the many colleagues and students with whom
I have collaborated and written joint papers; they are identified in
the bibliography. It also includes those who, through questions and
discussions, showed me where my own understanding of certain points
had been incomplete.
I also thank Peter-John Leone, Earth Sciences Editor, Rhona
Johnson, Manuscript Development Editor, and Louise Calabro Gruen-
del, Production Editor, of Cambridge University Press in New York
for the efficient way in which they have managed the preparation of
the book and for their sensitivity in dealing with my concerns on the
matter. It has been a pleasure to be involved in long-term programs of
research on fracture mechanics funded by the Office of Naval Research
and by the National Science Foundation. These programs, and the
collaborations that they have fostered, have been invaluable.
Finally, I thank my wife Colleen and our sons, Jon, Jeff, and
Steve, who enthusiastically adopted the mission of writing this book
as their own. Their interest and unwavering devotion have lightened
the task immensely.
L. B. Freund

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[ Last edited by zhq025 on 2008-1-16 at 10:33 ]

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