Abstract
Thermal transient stress analyses and pressure stress analyses were conducted using simplified turbine casing models with the variations of dimensional parameters. Thermal stress concentration factors were evaluated by the empirical formula and utilized for elastic-plastic strain analyses. Creep-fatigue damage was evaluated by the cumulative damage rule expressed in terms of cycle fraction and time fraction. The 2-dimensional probability function was used for calculating the failure probability under creep-fatigue damage, which was converted into time-based and cycle-based probability functions. The optimum dimensions were selected by equi-probability contours and the optimum maintenance intervals were determined using risk-cost functions. The proposed method was proved to be effective for the optimum design and maintenance decision making of high temperature components.
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