【摘要】 在分析Fatemi-Socie疲劳寿命预测模型不足的基础上，定义具有较大法向应变范围的最大切应变范围平面为临界平面，提出了一种基于切应变能密度的多轴疲劳寿命预测模型，给出了模型中各疲劳破坏参数、材料常数和临界平面位置的确定步骤，并利用6种材料的疲劳试验结果对所建模型进行了验证。结果表明：利用平均应力敏感系数修正后的平均切应力，既可以反映不同材料对平均切应力敏感程度的不同，也可以很好地反映平均切应力对材料多轴疲劳损伤的影响。在拉扭比例加载、非比例加载和非对称加载下，分别有100%、93.2%、90.4%的预测结果位于3倍误差带内。更多还原

【Abstract】 A shear strain-energy-density-based multiaxial fatigue life prediction model was proposed after analyzing the draw-backs of the Fatemi-Socie model. In this developed criterion, the critical plane was defined as the plane of maximum shear strain range with larger normal strain. Step-by-step procedures were outlined to determine the orientation of the defined critical plane, the material constants and the damage parameters incorporated in the proposed model. Besides, the reliability of the developed criterion was systematically validated using the experimental data through testing of 6 kinds of materials. It was found that the mean shear stress modified by the introduced mean shear stress sensitivity coefficient can reflect not only the different degrees of sensitivity of materials to mean shear stress, but also the influence of mean shear stress on multiaxial fatigue damage of materials. Under the proportional, non-proportional,and asymmetric loadings, 100%, 93.2%, and 90.4% of the predicted results fell within the factor-of-three boundary, respectively.更多还原