Short review on multiscale short fatigue crack growth model

Abstract

The behaviors of short fatigue crack remain to be one of the most challenging topics in fracture mechanics. It is widely accepted that the process of short fatigue crack can be divided as microstructure-sensitive stage and microstructure-independent stage. The inherent multiscaling characteristics necessitates the formulation of multiscale short fatigue crack growth model. One crucial way to address the concern is to explore physically reasonable expression of crack-tip driving force. This paper briefly reviews the short fatigue crack growth models through two approaches. One way is the further modification of conventional stress intensity factor (SIF) range. The other way is to seek the replacement of SIF range, by employing J-integral and strain energy density factor. Reflections on the present multiscale models are summarized in the concluding remarks.