| Citation: | Zhou Yuhang, Zhang Tong, Wang Yanrong, et al. Damage analysis of turbine blade considering creep and fatigue under load spectrum[J]. Journal of Aerospace Power, 2026, 41（8）：20250015 doi: 10.13224/j.cnki.jasp.20250015
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Using the three-stage normalized parametric creep model, the creep behavior of a turbine blade under a typical multi-condition test load spectrum was simulated through the usercreep subroutine. The results indicated that as creep strain increased, stress relaxation occurred in stress concentration regions. Under high operating conditions, significant creep strain accumulation and stress relaxation were observed. Under a single load spectrum cycle, the creep strain induced by high operating conditions accounted for more than 90%. Based on Miner’s linear damage accumulation rule, a damage analysis of the turbine blade was conducted as part of the life prediction process. In practical applications, the test load was significantly higher than the actual operating intensity. Therefore, to more accurately evaluate the mean time to failure (MTTF) of the blade, an equivalent damage factor was employed to assess the equivalent operating time of the blade and establish an estimation process. For the turbine blade and test load spectrum, the equivalent duration under actual operating conditions was calculated to be 26 283.6 h.
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