Probability of multiple site damage occurrence and experimental validation
Three methods,two currently available and a newly presented,for evaluating the probability of Multiple Site Damage (MSD) occurrence were studied in this paper.One of the available methods is a probabilistic analysis approach based on the statistical theory and fatigue characteristics of each structural detail,the other is an approach which defines the initial damage scenario by means of Monte-Carlo simulation,and multiple initial crack scenarios are randomly generated.A modified method was proposed in this paper,in which the random fluctuation of the stress was considered to give more accurate evaluation results.In the presented method,crack initiation life of a single detail was assumed to follow the logarithmic normal distribution,and the probability of MSD occurrence in a structural element containing multiple details was calculated based on Monte-Carlo simulation and the p-S-N curve of a single structural detail.Fatigue tests were accomplished using specimens containing 21-similar-details to obtain the fatigue life corresponding to MSD occurrence.Tests on single-detail specimens and static calibration tests were also conducted to get the basic fatigue properties of the material and the degree of stress fluctuation.The aforementioned three methods were compared and validated via the test results.
multiple site damage (MSD) fatigue crack initiation probability stress fluctuation
J.P.Zhang R.Bao J.Y.Zhang X.L.Zheng
Insititute of Solid Mechanics,Beihang University,Beijing,100191,China Beijing Aeronautical Science & Technology Research Institute,Beijing 102211,China
国际会议
International Conference on Airworthiness & Fatigue -7th ICSAELS Series Conference(大飞机安全性能与疲劳国际会议)
北京
英文
113-116
2013-03-24（万方平台首次上网日期，不代表论文的发表时间）