基于对数正态分布的多部位疲劳结构的疲劳寿命预测方法

doi:10.7527/S1000-6893.2016.0210

Abstract

Abstract:

To predict the fatigue life of multi-site fatigue structure, a probabilistic fatigue life prediction method based on the probabilistic accumulated damage rule is proposed, considering that fatigue life obeys lognormal distribution. According to the precondition that the damage critical value is independent of stress level, the damage critical value is transformed from the traditionally deterministic value 1 into a random variable, and the accumulated damage is calculated by the median S-N curve. An accumulated damage-probabilistic damage critical value interference model is thus built. When logarithmic fatigue life standard deviation is constant, life prediction result of the proposed interference model is compared with that of the Miner accumulated damage model based on Monte Carlo simulation. The comparison result verifies accuracy and efficiency of the proposed model. When logarithmic fatigue life standard deviation is varied, the damage critical value is decided by damage equivalent stress, and a high-precision and safer life prediction result can be gained.

Key words: multiple-site fatigue, fatigue life, reliability, median damage, critical value of probabilistic damage, Monte Carlo simulation

CLC Number:

TAN Xiufeng, XIE Liyang, MA Hongyi, ZHANG Na, LUO Yijian. Fatigue life prediction method for multi-site fatigue structure with lognormal fatigue life[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(2): 220376-220382.

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Fatigue life prediction method for multi-site fatigue structure with lognormal fatigue life

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