Fatigue fracture is the main failure mode of most mechanical components [1], Meanwhile, the initiation and propagation of fatigue crack for smooth surface components occupy the most part of service life [2]. The behavior of short fatigue crack, which is strongly affected by micro-structure in the microstructure short crack (MSC) stage and large scale yielding in the physical short crack (PSC) stage, is not similar with conventional long crack [3-5]. Therefore, method of linear elastic fracture mechanics (LEFM) cannot be applied to solving short crack problems directly while the research of short fatigue crack behavior is of great importance.
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