Abstract
In recent years, there has been a need to develop safety evaluation methods for structures such as power generation facilities in overloading. However, the failure criterion for cracks in structures under extremely low cycle fatigue is not clear. In addition, the fracture criteria proposed in previous studies have not been sufficiently verified in terms of the applicable range. Therefore, the experimental results of fatigue crack propagation in SGV410 material with 1.5 inch CT specimens at stress ratios of R=-1.0 and -1.5 are reproduced by analysis using ΔJ as the crack propagation condition. The objective is to extend the applicability of the equation by correcting the failure criterion, which consists of stress triaxiality and equivalent strain increment, by the stress ratio. In this paper, the applicability of the fracture criterion to R=-1.5 is verified.
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