Current status and issues on creep-fatigue life evaluation in elevated temperature design

Elevated temperature design standards have been developed in many countries to be applied for the designing of components operated at high temperature such as fossil power plant, petroleum plant and fast breeder reactor. Dominant failure mode considered in these components is creep-fatigue crack initiation under cyclic thermal stress at elevated temperature. It is important to develop the estimation methods for strain behavior and strength under the nonlinear conditions to perform a rational design. This paper presents a comparison among creep-fatigue life prediction methods in representative design codes such as ASME Sec. III NH in USA, BDS and DDS in Japan, R5 in UK and RCC-MR in France. (author)