The high-cycle fatigue life with respect to the multiaxial variable-stress amplitude was evaluated by applying the newly proposed total path length method for calculating the stress amplitude. Variable-stress-amplitude fatigue tests were conducted for verification based on the combined axial and torsional loads on AISI 4340 steel. The fatigue test load waveform denoted that the stress amplitude, mean stress, and load direction varied within one loop. The obtained lives were shorter than those predicted using the Wang–Brown method, longer than those predicted using the PDMR method, and comparable to those predicted using the total path length method.

中文翻译：

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关于AISI 4340钢在多轴可变振幅载荷下的疲劳寿命预测，基于路径长度计算出的雨水损失

通过应用新提出的总路径长度方法计算应力幅值，评估了相对于多轴可变应力幅值的高周疲劳寿命。基于AISI 4340钢的轴向和扭转载荷组合，进行了可变应力振幅疲劳测试，以进行验证。疲劳测试载荷波形表明，应力幅值，平均应力和载荷方向在一圈内变化。获得的寿命比使用Wang-Brown方法预测的寿命短，比使用PDMR方法预测的寿命长，并且与使用总路径长度方法预测的寿命相当。