This paper deals with the prediction of short and long fatigue crack growth in notched members using linear elastic fracture mechanics (LBFM) and includes the stochastic nature of the fatigue process. The probabilistic approach to modelling of crack growth in the depth of components links up with the authors' previous work, which considered surface crack growth in notched and unnotched samples. The capability of the discussed method in terms of crack growth prediction and lifetime estimation has been verified using experimental data gained for the (α+β) Ti-6Al-3Mo-2Cr (Vt3-1) alloy tested under reversed torsion and reversed bending, at room temperature, and in the range of high cycle fatigue (HCF). Characteristic features of crack initiation and propagation in the examined titanium alloy components with a circumferential notch are shown. Micro-observations of fracture surfaces using both a SEM and TEM allowed us to establish the mechanism of cracking.
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