Abstract
The crack tip blunting and re-sharpening on the crack tip is one of the basic mechanisms for fatigue crack growth in ductile metals and alloys, e.g. Laird [1], Neumann [2]. Previous numerical studies of crack tip blunting made by Mc Meeking [3], Needleman and Tvergaard [4] have been carried out for monotonic loading. Subsequently, this kind of analysis has been made for cyclic loading (Gu and Ritchie, Tvergaard and Hutchinson [5]), for the load ratio R=0. It is shown that is possible to obtain fatigue crack growth, which can be comparable with Paris law. Perfect plasticity and a finite element mesh with a small initial radius of the crack tip were used. Because of strong mesh distortion they were applied only three full cycles.
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