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为了考虑应力集中对构件疲劳寿命的影响,采用能量参数作为疲劳损伤评估参量,发展了一种基于能量的非局部缺口疲劳寿命预测方法,该方法通过相同寿命条件下缺口试样与光滑试样的疲劳损伤等效关系确定用于定义缺口试样非局部临界体积的能量参数门槛值,并建立了能量参数门槛值与疲劳寿命的关系,进而通过迭代程序便可进行缺口试样寿命预测。试验验证结果表明:缺口试样能量参数门槛值与疲劳寿命在双对数坐标系下呈线性关系;所发展的方法对缺口疲劳试验试样的寿命预测精度较高,预测寿命分散带在2倍以内。
In order to consider the influence of stress concentration on the fatigue life of components, an energy-based fatigue prediction method based on energy parameters was developed. This method developed a non-local fatigue life prediction method based on energy. The fatigue damage equivalence relation determines the energy parameter threshold used to define the non-local critical volume of the notched specimen and establishes the relationship between the threshold of energy parameter and the fatigue life. Then the life expectancy of the notched specimen can be predicted through the iterative procedure. The experimental results show that the threshold value of the energy parameter of the notched specimen and the fatigue life have a linear relationship in the double logarithmic coordinate system. The developed method has higher prediction accuracy for the fatigue life of the notched fatigue test specimen, Within.