Creep-fatigue Life Design Methods in High-temperature Structures: From Materials to Components

doi:10.3901/JME.2021.16.066

Abstract

Abstract: Structural components used in many fields operate under harsh environment of high temperatures and cyclic loadings, the service process of which is always associated with serious creep-fatigue interactions. With the urgent demands of long life and high reliability of high-temperature structures, the creep-fatigue life design method has been paid more and more attentions from both engineering and academics. The creep-fatigue interaction is firstly introduced, and microscopic damage mechanisms under complex creep-fatigue loading waveforms are subsequently summarized. At the material level, creep-fatigue life prediction models based on different theoretical methods are reviewed. At the structural level, the effect of multiaxial stress on creep and fatigue damage is clarified and the life design method based on creep-fatigue interaction diagram is elaborated. Moreover, the creep-fatigue reliability analysis method ranging from creep-fatigue crack initiation to propagation is reviewed. Finally, further directions on creep-fatigue study are explored and concluded.

Key words: creep-fatigue, damage assessment, life design, multiaxial stress, reliability method

CLC Number:

O346

WANG Runzi, LIAO Ding, ZHANG Xiancheng, ZHU Shunpeng, TU Shantung, GUO Sujuan. Creep-fatigue Life Design Methods in High-temperature Structures: From Materials to Components[J]. Journal of Mechanical Engineering, 2021, 57(16): 66-86,105.

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