Abstract
Residual creep life prediction under variable creep loading is an important issue in structural design. The loading sequence has a significant effect on the rupture life, which refers to the sequence effect, including the temperature sequence at constant stress and the stress sequence at constant temperature. This paper investigates the creep life prediction model taking into account the sequence effect. First, the experimental results from the literature were collected to summarize the sequence effect they revealed. Then various creep life prediction models were reviewed and their main limitations were pointed out. A novel creep life prediction model was proposed based on the time fraction model. Finally, two-level tests were carried out on nickel-based superalloy FGH96 to validate the model. In addition, two-level and multi-level creep test results from public literature were used to validate. The results show that the proposed model effectively consider the sequence effect under various loading conditions.
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