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首页> 美国卫生研究院文献>Materials >Application of the S-N Curve Mean Stress Correction Model in Terms of Fatigue Life Estimation for Random Torsional Loading for Selected Aluminum Alloys
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Application of the S-N Curve Mean Stress Correction Model in Terms of Fatigue Life Estimation for Random Torsional Loading for Selected Aluminum Alloys

机译：S-N曲线平均应力校正模型在选定铝合金随机扭转负荷的疲劳寿命估计方面的应用

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The paper presents the experimental fatigue test results for cyclic constant amplitude loading conditions for the case of the torsion of the PA4 (AW-6082-T6), PA6 (AW-2017A-T4) and PA7 (AW-2024-T3) aluminum alloy for a drilled diabolo type test specimen. The tests have been performed for the stress asymmetry ratios = −1, = −0.7, = −0.5 and = −0.3. The experimental results have been used in the process of a fatigue life estimation performed for a random generated narrowband stress signal with a zero and a non-zero global mean stress value. The calculations have been performed within the time domain with the use of the rainflow cycle counting method and the Palmgren−Miner damage hypothesis. The mean stress compensation has been performed with the S-N curve mean stress model proposed by Niesłony and Böhm. The model has been modified in terms of torsional loading conditions. In order to obtain an appropriate = 0 ratio S-N curve fatigue strength amplitude, the Smith−Watson−Topper model was used and compared with literature fatigue strength amplitudes. The presented solution extends the use of the correction model in terms of the torsional loading condition in order to obtain new S-N curves for other values on the basis of the = −1 results. The work includes the computational results for new fatigue curves with and without the mean stress effect correction. The results of the computations show that the mean stress effect plays a major role in the fatigue life assessment of the tested aluminum alloys and that the method can be used to assess the fatigue life under random conditions.
机译：本文介绍了对PA4（AW-6082-T6），PA6（AW-2024-T4）和PA7（AW-2024-T3）铝合金扭转的循环恒定幅度负载条件的实验疲劳试验结果用于钻孔的竹节型试样。已经对应力不对称比率= -1，= -0.7，= -0.5和= -0.3进行了测试。实验结果已经用于对随机产生的窄带应力信号进行的疲劳寿命估计的过程中使用，其具有零和非零全局平均应力值。在时域内进行了计算，利用雨流程循环计数方法和PalmGren-Miner损伤假设。已经用Ni​​esłony和Böhm提出的S-N曲线平均应力模型进行了平均应力补偿。该模型已经在扭转负载条件方面进行了修改。为了获得适当的= 0比率S-N曲线疲劳强度幅度，使用史密斯 - Watson-Topper模型并与文献疲劳强度振幅进行比较。所提出的解决方案在扭转负载条件方面延伸了校正模型的使用，以便基于= -1结果获得用于其他值的新的S-N曲线。该工作包括具有和没有平均应力效应校正的新疲劳曲线的计算结果。计算结果表明，平均应力效应在经过测试的铝合金的疲劳寿命评估中起主要作用，并且该方法可用于评估随机条件下的疲劳寿命。

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