An Evaluation of Appropriate Probabilistic S-N Curve for the Turbine Blade Steel in the Low Pressure Steam
In order to evaluate the variation of fatigue data of turbine blade steel in low pressure (LP) steam, it is important to estimate probabilistic stress-life (P-S-N) curve to accurately define the probability distribution. In this study, a new procedure was introduced to determine the expression of P-S-N curves. For this purpose, 3-parameter Weibull distribution was found to be the most appropriate among assumed distributions when the probability distributions of the fatigue life were examined by a comparative analysis. Furthermore, the parameter of P-S-N curve was evaluated using various optimization techniques to maximize the correlation coefficient. As a result, the sequential linear program method is used for estimation of P-S-N curve.
Young-Jin Kim, Dong-Ho Bae and Yun-Jae Kim
C. S. Kim et al., "An Evaluation of Appropriate Probabilistic S-N Curve for the Turbine Blade Steel in the Low Pressure Steam", Key Engineering Materials, Vols. 297-300, pp. 1751-1757, 2005