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针对镍基单晶和定向结晶合金的高温低循环疲劳/蠕变寿命预测问题,用晶向函数修正总应变范围以考虑疲劳寿命的各向异性,并综合考虑了最大应力、平均应力、应力范围以及峰值保持等载荷因素对寿命的贡献,在循环损伤累积思想的基础上发展了一种低循环疲劳/蠕变寿命预测方法.利用定向结晶合金DZ125、单晶合金DD3和DD6在不同温度、不同取样方向和不同保载形式作用下的试验结果,对方法进行了验证,预测与试验寿命相比基本落在2倍分散带内,表明该方法能更好地适应叶片材料各向异性与低循环疲劳/蠕变载荷的情况.
Aiming at the problems of high temperature and low cycle fatigue / creep life prediction of Ni-based single crystal and oriented crystal alloy, the total strain range is corrected by the crystal orientation function to consider the anisotropy of fatigue life, and the maximum stress, average stress and stress range And the contribution of peak load and other load factors to the life span, a method of predicting the fatigue life of low cycle fatigue / creep was developed based on the cumulative thought of cyclic damage.Using the directional crystal alloy DZ125 and single crystal alloys DD3 and DD6 at different temperatures and different The direction of sampling and the test results under different loading conditions, the method was validated, the prediction and test life basically fell within 2 times dispersion, indicating that this method can better adapt to the leaf material anisotropy and low circulation Fatigue / creep load conditions.