The mechanics of composite strength evolution

The present paper investigates the concept of evolution of strength in fibrous composite systems. In particular, the conceptual foundations of the ‘critical-element method,’ developed by the authors, are defined and systematically combined to construct a philosophy for the prediction of remaining strength and life of composite materials in the presence of combined mechanical, thermal, and environmental applied conditions that may produce concomitant fatigue, creep, and stress rupture. This philosophy, developed and applied over a fifteen year period, has not been presented in collected form in previous publications. Since Dr. Pagano was a contributor to some of the micromechanical concepts used in the philosophy, the present volume was judged to be an appropriate place for a statement of the philosophy.