A new frequency domain method for random fatigue life estimation in a wide-band stationary Gaussian random process
A new frequency domain method for random fatigue life estimation in a wide-band stationary Gaussian random process
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DOI：
10.1111/ffe.12875
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发表时间：
2018-07
影响因子：
3.7
通讯作者：
Q. Han;Jia Li;Jie Xu;Fei Ye;A. Carpinteri;G. Lacidogna
中科院分区：
文献类型：
--
作者：
Q. Han;Jia Li;Jie Xu;Fei Ye;A. Carpinteri;G. Lacidogna
提出了一种新的宽带平稳高斯随机过程中的随机疲劳寿命估计频域方法，并将其应用于疲劳分析。首先对不同类型的功率谱密度进行了仿真，仿真结果表明，现有频域方法的准确性和适用性不仅与谱类型有关，还与被分析材料的类型有关。与现有方法相比，雨流幅值服从Nakagami分布的该方法具有更好的普适性，可以显着减少模拟谱和实际谱的随机疲劳寿命估计误差。验证了随机疲劳寿命和等幅疲劳寿命在铸钢疲劳寿命分析中的应用。结果表明，随机载荷作用下的疲劳寿命分析不容忽视，该方法可作为一种推荐方法。
A new frequency domain method for random fatigue life estimation in a wide‐band stationary Gaussian random process was proposed for application in fatigue analysis. Simulations of the power spectral densities of different types were firstly performed; the simulated results showed that the accuracy and applicability for the current frequency domain methods are not only related to the spectral type but also associated with the types of the analysed materials. Compared with the current methods, the proposed method, in which the rain‐flow amplitude obeys Nakagami distribution, has better universality and could significantly reduce the error for the random fatigue life estimation with simulated and actual spectra. Verified application in cast‐steel fatigue life analysis were performed between random fatigue life and constant amplitude fatigue life. It is shown that the fatigue life analysis under random load cannot be ignored and the proposed new method can serve as a recommended method.