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首页> 外文会议>Proceedings of International conference on airworthiness amp; fatigue >Probability of multiple site damage occurrence and experimental validation
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Probability of multiple site damage occurrence and experimental validation

机译：多站点损坏发生的可能性和实验验证

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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.
机译：本文研究了三种评估多站点损伤（MSD）发生概率的方法，目前有两种，一种是新提出的。一种可用的方法是基于统计理论和每种结构的疲劳特性的概率分析方法。详细地讲，另一种方法是通过蒙特卡洛模拟来定义初始损伤情况，并随机生成多个初始裂纹情况。本文提出了一种改进的方法，其中考虑了应力的随机波动，在提出的方法中，假设单个细节的裂纹萌生寿命服从对数正态分布，并且基于蒙特卡洛模拟法计算了包含多个细节的结构元件中MSD发生的概率。单个结构细节的pSN曲线。使用包含21个相似的通过对材料的基本疲劳特性和应力波动程度进行测试，并进行了单细节试验和静态校准测试，对上述三种方法进行了比较和验证。试验结果。

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