Abstract
Accurate characterization of stress states is essential to assess structural integrity and predict fatigue crack growth life. Strong three dimensional constraints always raise at cracks and holes, but have never been investigated in the frame of three dimensional fracture theory for part-through cracks emanating from a hole. Here the three dimensional constraint and its effect on crack tip fields of corner and surface cracks emanating from a circular hole in tensile plates are comprehensively analyzed using finite element method. Distributions of the out-of-plane constraint factor Tz are strongly dependent on relative circular hole size and relative thickness parameters, but the K-Tz description of the stress field remains efficient with the present of circular hole. The equivalent thickness conception based on Tz distributions is applied to crack tip stress field description. Based on the equivalent thickness conception and plasticity-induced fatigue crack closure model, evaluation of fatigue growth of corner crack emanating from a circular hole is demonstrated and validated against test data in the literature.
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