<p class="MsoNormal">The ASME Boiler and Pressure Vessel (B&amp;PV) Code Section III, Division 5, Subsection HB, Subpart B had provided only one design fatigue curve for grade 91 steel (Gr.91) at 540 °C (or 1000 °F). To improve the this disadvantage, an activity to incorporate the best fit fatigue curve equation of Gr.91 steel developed by the Japan Society of Mechanical Engineers(JSME) into the ASME B&amp;PV Code Section III Division 5 had taken. As the results, the temperature dependent fatigue design curves will be provided in the next edition. To clear the features of the best fit fatigue curve equation developed by the JSME and its database, the 305 data stored in the database were analyzed to inform the detail of the database and relationship between the best fit fatigue curve equation and the data. The statistic values and the values of 95% and 99% lower confidence bound calculated by failure probability assessment are also provided. In addition to best fit fatigue curve equation, an equation for dynamic stress-strain response indicating the feature of cyclic loading of Gr.91 steel is also provided using the same database. Moreover, the additional available data of fatigue and creep-fatigue test obtained in Japan are also indicated for considering the fatigue damage evaluation under elevated temperature condition.</p>

Evaluation of the Japanese Fatigue Test Data in Gr.91 for Elevated Temperature Design

Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2021/volume/85314

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