The plane with the maximum variance of the resolved shear stress is taken as the critical plane. Two algorithms are used along with the maximum variance method (MVM) to determine the orientation of the critical plane. The maximum variance of the normal stress on the potential critical planes is calculated to determine the one experiencing the maximum extent of fatigue damage. A new multiaxial cycle counting method is proposed to count cycles on the critical plane. The modified Wöhler curve method is used to assess fatigue damage. About 200 experimental results were collected from the technical literature to validate the approaches being proposed. The results show that the improved design technique being proposed is successful in assessing fatigue damage under variable amplitude multiaxial cyclic loading.

中文翻译：

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一种改进的临界面和循环计数方法，用于评估可变振幅多轴疲劳载荷下的损伤

解析剪切应力变化最大的平面被视为临界平面。与最大方差法（MVM）一起使用了两种算法来确定临界平面的方向。计算潜在临界面上法向应力的最大方差，以确定一个疲劳破坏程度最大的应力。提出了一种新的多轴循环计数方法来对临界面上的循环进行计数。改进的沃勒曲线法用于评估疲劳损伤。从技术文献中收集了大约200个实验结果，以验证所提出的方法。结果表明，提出的改进设计技术可以成功地评估可变振幅多轴循环载荷下的疲劳损伤。