Abstract

Prediction of failure life under creep-fatigue condition is of practical importance for sound design and operation of high-temperature plants. Stress-based time-fraction approach often overpredicts failure life because of difference of deformation under monotonic creep and creep-fatigue loading. Strain-based life prediction procedure called ductility exhaustion method has been developed to overcome shortcoming of simpler stress-based approach. However, overly conservative prediction is obtained for some materials by the conventional way of creep damage counting in the ductility exhaustion method. A new method which includes alternative ways of creep damage calculation and modeling creep-fatigue interaction, was developed in this study. This method was applied to a number of creep-fatigue tests conducted for modified 9Cr-1Mo steel (P91) and HCM12A (P122). Excellent agreement was obtained between predicted and experimental lives.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.