基于局部应变能密度法的缺口多轴疲劳寿命评估

本文提出了包括实验和数值工作在内的综合分析，阐明了缺口行为对比例多轴疲劳寿命的影响。方法对45钢和45QT钢进行了考虑缺口半径和开口角的多轴疲劳试验，基于平均应变能量密度理论的多轴疲劳分析的分析和计算框架进行了研究，以处理能量梯度。结果显示，大量新的疲劳数据首先通过法向应力和剪应力进行汇总，然后通过凹口尖端周围受控体积中的局部应变能密度重新分析。结论缺口角度对比例载荷下多轴疲劳数据的影响较小，而缺口半径是影响疲劳寿命的主要因素。

Assessment of Notch Multiaxial Fatigue Life Based on Local Strain Energy Density Method

In this paper, a comprehensive analysis including experimental and numerical work is presented to illustrate the effect of notch behavior on proportional multiaxial fatigue life. Methods multiaxial fatigue tests were carried out on 45 steel and 45QT steel considering notch radius and opening angle. The analytical and computational framework of multiaxial fatigue analysis based on the theory of average strain energy density was studied to deal with energy gradient. A large number of new fatigue data were first summarized by normal stress and shear stress, and then reanalyzed by local strain energy density in the controlled volume around the notch tip. Conclusion the notch angle has little effect on the multiaxial fatigue data under comparative load, and the notch radius is the main factor affecting the fatigue life.