Abstract
Abstract Mechanistically-based fracture mechanics models are presented for the prediction of multiple semi-elliptical crack growth in Q1N (HY80) pressure vessel steel. Following a review of the mechanisms of multiple coplanar and non-coplanar semi-elliptical fatigue crack growth, mechanistically-based fracture mechanics models are presented for the prediction of fatigue crack growth. The models include simplified fracture mechanics idealizations of crack interaction and coalescence of coplanar and offset non-coplanar cracks. Predictions obtained from the models are shown to be in closer agreement with measured fatigue crack growth data than the predictions obtained from current ASME Section XI and BS PD 6493 codes. The implications of the models are discussed for the prediction of fatigue life of structures and components that contain multiple configurations of semi-elliptical fatigue cracks.
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