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Conventional fracture mechanics have made it possible to quantify the slow propagation of a crack subjected to cyclic loadings,as well as the fracture phase. Unfortunately,it is still impossible to quantify seperately the initiation phasc of a crack. Fatigue crack initiation was investigated by testing 2124T351 Aluminum alloy with 12 mm thick ASTM compact tension specimens having various notch-root radii between 0.1 and 10 mm . Crack initiation was detected by electric potential method. In order to calculate the number of cycles required to initiate a crack,notch root behavior was investigated through two main approaches: Elastic and Elasto-plastic analysis of stress concentration under fatigue. The effect of confined plasticity at the notch root was analysed. Consideration of this plasticity would ameliorate to a great extent the crack initiation analysis and prediction. Lecturers,Dept. of Aeronautical Engineering,Military Technical College,CAIRO. ** Lecturer,Dept. of Machine Design,Military Technical College,CAIRO.

Low Cycle Fatigue and Crack Initiation Prediction at the Root of a Notch