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Influence of geometry properties on fatigue life of V-notched structures

The singular stress gradient associated to a V-notch has great influence on the fatigue life of V-notched structures.The growth rate of the crack initiated from the notch depends on the singular stress of the V-notch.In this paper,the boundary element method is used to investigate crack propagation from the notch tip under fatigue loading.A comparison of the fatigue life between the crack from the notch tip and a purely lateral crack is done by the crack propagation law until these two cracks have the same stress intensity factors.The effect of the notch opening angle,the notch depth and the initial crack length on the crack extension and propagation is analyzed.