Over the past few years, we have made numerous presentations, delivered
several series of lectures, and participated in many discussions on the
processes of time-dependent crack growth. We felt that the understanding
of these processes had reached a degree of maturity: the basic physical
principles were established and their application to engineering
practice was now feasible. We concluded that the best way to organize
this knowledge was to write it up in a single, coherent system. Martinus
Nijhoff kindly encouraged us and generously offered their collaboration.
Hence, this book. The physical process of time-dependent subcritical
crack growth is rigorously defined by statistical mechanics. If well
presented, the principles can be readily understood by practitioners of
fracture research and design engineers. We present the physical
processes of crack growth in terms of atomic interactions that assume
only a working knowledge of the standard engineering materials course
contents. From this, we develop a framework that is valid for any type
of material, be it metallic, polymeric, ceramic, glass or mineral -
indeed, any solid. We also assume an elementary exposure to fracture
mechanics. An appendix is provided that outlines those aspects of
fracture mechanics that are needed for an introduction to fracture
kinetics analyses; it also provides a common ground for concepts and
terminology (see Appendix A). We proceed through theory to applications
that are of interest in research, development and design, as well as in
test and operating engineering practice.