广布疲劳损伤裂纹萌生寿命概率分布分析模型

发布时间：2018-11-19 17:03

【摘要】：提出了一种广布疲劳损伤裂纹萌生寿命概率分布的分析模型。通过研究广布疲劳损伤敏感结构中裂纹萌生机理,将多细节结构裂纹萌生寿命的取值事件转化为3个独立事件的积事件,前者的发生概率等于3个独立事件发生概率的乘积,3个独立事件的发生概率可由单细节结构裂纹萌生寿命的概率分布求得。从而可由单细节结构裂纹萌生寿命概率分布得到多细节结构中依次出现的各条裂纹的萌生寿命的概率分布。进行了单细节带孔板与多细节带孔板的裂纹萌生试验,并利用本文分析模型对多细节带孔板的裂纹萌生寿命进行了预测。预测结果和试验结果吻合良好,表明该模型是有效的。
[Abstract]:An analytical model of probability distribution of fatigue crack initiation life is proposed. By studying the mechanism of crack initiation in wide-spread fatigue damage-sensitive structures, the value events of crack initiation life of multi-detail structures are transformed into the product events of three independent events. The occurrence probability of the former is equal to the product of the occurrence probability of the three independent events. The occurrence probability of three independent events can be obtained from the probability distribution of crack initiation life of single detail structure. Thus, the probability distribution of crack initiation life of multi-detail structures can be obtained from the probability distribution of crack initiation life of single-detail structure. In this paper, the crack initiation test of single and multi-detail plate with holes is carried out, and the crack initiation life of the plate with multiple details is predicted by using the analytical model in this paper. The predicted results are in good agreement with the experimental results, which shows that the model is effective.
【作者单位】：上海飞机设计研究院强度设计研究部;南京航空航天大学机械结构力学及控制国家重点实验室;
【基金】：国家自然科学基金资助项目(51275241)
【分类号】：V215.5

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