Abstract
High temperature low cycle fatigue analysis is a problem of general concern in engineering. In this paper, which deals with prediction of high temperature low cycle fatigue (LCF) life at the edge of the leakage hole of an aero-turbine disk, the LCF tests have been carried out at 300°C for cylindrical specimens with and without circumferential notch. A new parameter, local equivalent strain energy density (LESED), was suggested. It can be used to describe and predict the high temperature LCF life of notched specimens which are in the multiaxial stress-strain state. Various mechanics parameters including LESED at the notch root of specimens have been calculated using an elastic-plastic finite element program. Comparing the LCF life curves obtained with different methods, it is evident that the LESED method can be used effectively not only for describing the LCF behavior of the notched specimens but also for predicting the LCF life of the notched specimens from the LCF life curves of the smooth specimens.
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