摘要
为了更准确地预估高温材料的低循环疲劳裂纹萌生寿命,将低循环疲劳的裂纹萌生过程视作损伤累积过程,基于连续损伤力学建立了损伤累积模型。结合360℃、650℃下GH4169合金的低循环疲劳寿命数据拟合出模型的具体表达式,进而开展了对低循环疲劳裂纹萌生寿命的预测试验。结果表明:该方法针对GH4169合金低循环疲劳裂纹萌生寿命的预测结果较为理想,其分散带基本在2倍以内,且能很好的反映变幅加载对GH4169合金低循环疲劳裂纹萌生寿命的影响。
In order to predict the low cycle fatigue crack initiation life of high temperature materials, the low cycle fatigue crack initiation life was regarded as a process of damage accumulation and a damage accumulation model was established based on the continuum damage mechanics. Parameters for low cycle fatigue life of GH4169 alloy at the temperatures of 360 ℃ and 650 ℃ were fitted to obtain the definite expression of the model, and low cycle fatigue crack initiation life predictions test were carried out. The results show that the low cycle fatigue crack initiation life used by the approach gives better estimation within about twice of scatter band for GH4169 alloy and a definite influence of variable amplitude loading on the low cycle fatigue crack initiation life of GH4169 alloy can be greatly reflected.
引文
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