Abstract
A 3D elastic-plastic FEM model for prediction of planar fatigue crack growth is presented in this paper. The model is based on the concept of local low-cycle fatigue of a small material volume in front of the high cycle crack. A local crack front advance is modelled by the successive release of finite element mesh nodes in the plane of propagation. The release of the nodes is controlled by the value of the Smith-Watson-Topper fatigue damage parameter in the surrounding elements. The effect of the material thickness on the fatigue crack growth and on the fatigue crack front shape is investigated.
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