| Citation: | LUO Xianqiang, DAI Jiangbo, FU Shunguo, et al. Forecast technology of aero engine blade HCF stress at high temperatures based on blade profile constant[J]. Journal of Aerospace Power, 2025, 40（5）：20220913 doi: 10.13224/j.cnki.jasp.20220913
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According to the expression of vibration stress of the cantilever beam under the resonance state, the blade shape constant which wouldn’t change with temperature change was defined. This constant can be calculated by testing the linear relationship between the first-order resonance stress and the amplitude of the blade at room temperature. Combined with amplitude and resonance frequency, which were easy to test at high temperature, the prediction of resonance stress at high temperature was realized. Turbine blade strain and amplitude were tested at 500, 600, 800 ℃ and 900 ℃ by high temperature strain gage. Comparison between true result and forecast result showed the applicability of the forecast technology. Absolute Strain error was less than 5×10−5.
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