【摘要】 提出了一种金属材料疲劳裂纹扩展曲线(a~N曲线)的拟合方法,即修正的双曲函数拟合方法。为检验这种曲线拟合方法的适用性,利用2024-T42铝合金CCT试样的疲劳裂纹扩展试验数据,对该铝合金的疲劳裂纹扩展曲线进行了拟合分析,并给出了疲劳裂纹扩展速率和扩展寿命。通过疲劳裂纹扩展寿命计算结果和试验结果的对比分析,证明这种拟合方法具有较高的拟合精度。更多还原

【Abstract】 In this paper, a new curve fitting approach to the fatigue crack growth characteristic of metals is developed, in which modified hyperbolic functions are employed. Based on the of fatigue crack growth testing data of 2024-T42 aluminum alloy, a curve fitting analysis of the fatigue crack growth characteristic is conducted and the fatigue crack growth rate and the fatigue life are given. Compared with experimental data, the results of the present curve fitting approach are shown to be accurate.更多还原