定向合金DZ125热/机械疲劳寿命预测模型评估
Life Predication of Thermomechanical Fatigue in DS Superalloy DZ125
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摘要: 分别用微裂纹扩展模型、Manson-Coffin方程和拉伸迟滞能模型对DZ125定向凝固铸造镍基高温合金的热/机械疲劳寿命进行预测。预测结果发现:三种模型都能较好对DZ125合金的热/机械疲劳寿命进行预测(分散带为2倍左右)。通过分散带和标准差的定量比较发现:对于同相位、-135°相位和同相位带保持时间的热/机械疲劳,拉伸迟滞能寿命预测模型的预测结果比微裂纹扩展模型和Manson-Coffin方程的预测结果好;而对于反相位热/机械疲劳,微裂纹扩展模型的预测结果比拉伸迟滞能寿命预测模型和Manson-Coffin方程的预测结果好。Abstract: Manson-Coffin equation,Ostergren method and microcrack propagation model were chosen to predict TMF life in DS Superalloy DZ125.The results of TMF life prediction showed that all of methods chosen were able to give a reasonable life prediction result for DS superalloy DZ125.For in-phase TMF,in-phase with hold time TMF and -135° phase angle TMF,Ostergren model gave a better life prediction result than Manson-Coffin equation and microcrack propagation model did. But for out-of-phase TMF,microcrack propagation model gave better results than Ostergren model and Manson-Coffin equation did.
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Key words:
- aerospace propulsion system /
- thermomechanical /
- fatigue /
- life prediction /
- in-phase /
- out-of-phase
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