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Numerical and experimental study on the optimization of overload parameters for the increase of fatigue life

机译:优化过载参数以延长疲劳寿命的数值和实验研究

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Fatigue life and crack growth retardation due to periodic tensile overloads, which are superposed on constant amplitude cycles, have been investigated in the present study. In the numerical analyses, the Walker equation with the generalized Willenborg model has been used. The analyses and experiments have been performed on C(T) specimens made of 7075 aluminium. The periodic overloads have been induced at two different periodicities and the effect of overload ratio and overload periodicity on the fatigue life has been studied. The results of the experiments and analyses reveal that the normalized fatigue life versus overload ratio curve has a maximum point, which indicates that there are greater retardation effects in the intermediate overload ratio values. Also, the numerical and experimental results indicate that at the occurrence ratios (the ratio of the number of overload cycles to the number of constant-amplitude cycles between overloads) of 1/50 and 1/500, the maximum interaction occurs at the overload ratios of 1.5 and 2.0. respectively.
机译:在本研究中已经研究了由于周期性拉伸过载而导致的疲劳寿命和裂纹扩展延迟,这些载荷叠加在恒定振幅循环上。在数值分析中,使用了具有广义Willenborg模型的Walker方程。已经对由7075铝制成的C(T)标本进行了分析和实验。在两个不同的周期上引起了周期性的过载,并且研究了过载比和过载周期对疲劳寿命的影响。实验和分析的结果表明,归一化疲劳寿命与过载比曲线具有最大值,这表明中间过载比值具有更大的延迟效应。而且,数值和实验结果表明,在1/50和1/500的发生率(过载循环数与过载之间的恒定振幅循环数之比)下,最大相互作用发生在过载率下1.5和2.0。分别。

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