A new calculation approach is suggested to the fatigue life evaluation of notched specimens under multiaxial variable amplitude loading. Within this suggested approach, if the computed uniaxial fatigue damage by the pure torsional loading path is larger than that by the axial tension–compression loading path, a shear strain‐based multiaxial fatigue damage parameter is assigned to calculate multiaxial fatigue damage; otherwise, an axial strain‐based multiaxial fatigue damage parameter is assigned to calculate multiaxial fatigue damage. Furthermore, the presented method employs shear strain‐based and axial strain‐based multiaxial fatigue damage parameters in substitution of equivalent strain amplitude to consider the influence of nonproportional additional hardening. The experimental data of GH4169 superalloy and 7050‐T7451 aluminium alloy notched components are used to illustrate the presented multiaxial fatigue lifetime estimation approach for notched components, and the results reveal that estimations are accurate.

中文翻译：

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变幅载荷下基于支配载荷控制模式的多轴缺口疲劳寿命预测

提出了一种新的计算方法，以评估缺口试样在多轴可变振幅载荷下的疲劳寿命。在这种建议的方法中，如果通过纯扭转载荷路径计算出的单轴疲劳损伤大于通过轴向拉伸-压缩载荷路径计算出的单轴疲劳损伤，则将基于剪切应变的多轴疲劳损伤参数指定为用于计算多轴疲劳损伤的方法。否则，将分配基于轴向应变的多轴疲劳损伤参数来计算多轴疲劳损伤。此外，本文提出的方法采用基于剪切应变和基于轴向应变的多轴疲劳损伤参数来替代等效应变幅度，以考虑非比例附加硬化的影响。