FUNDAMENTALS OF FATIGUE CRACK INITIATION and PROPAGATION: A REVIEW

摘要

The prediction of fatigue properties of structural materials is rightly recognized as one of the most important problems in the domain of engineering. Therefore, an understanding of the fundamental nature of fatigue crack initiation and fatigue crack growth in metals spanning the entire spectrum of conventional and advanced has long been a major scientific challenge starting with the first dislocation model of fatigue crack growth put forth by Bilby and co-workers in 1963 (B.A. Bilby, A.H. Cottrell, and K.H. Swinden, "The Spread of Plastic Yield From a Notch", Proceedings of the Royal Society of London, 1963: A272:304). Understanding the process of emission of dislocations from cracks, and determining precise expressions for size of the plastic zone size, the crack-tip opening displacement, and the energy release rate of the cracks, are some of the major technical issues for this purpose. In this review, we summarize briefly some of the important recent results and how they can contribute to enabling and enriching our understanding of the phenomena.