Structural probabilistic model of fatigue cumulative damage under uncertain cyclic load

被引：0
|
作者：
Gao J. [1 ]
An Z. [1 ]
Kou H. [1 ]
机构：
[1] School of Mechatronic Engineering, Lanzhou University of Technology, Lanzhou
来源：
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2017年 / 38卷 / 02期
关键词：
Cumulative damage; Fatigue life; Probability distribution; Reliability; S-N curve;
D O I：
10.11990/jheu.201509085
中图分类号：
学科分类号：
摘要：
Probabilistic fatigue cumulative damage theory is the key issue of product reliability assessment and fatigue life prediction, which focuses on the probability distributions of the instantaneous cumulative damage and the critical damage. Based on the fundamental relationship between stress and fatigue life (that is, the equation of S-N curve), a probability density function of fatigue life was derived from the probability density function of stress; Then, a probabilistic model of fatigue cumulative damage was proposed based on the Miner's rule; Finally, the validity of the proposed model was verified by a practical case. The result shows that the distribution of fatigue cumulative damage is affected by the external factors (characteristics of the load) and the internal factors (fatigue performance parameters of material), and the proposed model can provide a theoretical basis for reliability design and fatigue life prediction. © 2017, Editorial Department of Journal of HEU. All right reserved.
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页码：263 / 268
页数：5
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