寿命和疲劳散射模型不确定性对设计曲线构造的影响

2016 7th International Conference on Mechanical and Aerospace Engineering (ICMAE) Pub Date : 2016-07-18 DOI:10.1109/ICMAE.2016.7549573

S. Yi, S. Duoqi, Y. Xiaoguang, Huang Fei

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引用次数: 0

摘要

疲劳散射是疲劳试验中不可避免的现象，影响部件或系统的寿命预测。在航空航天工程中，飞机和燃气涡轮发动机的部件都是基于设计曲线进行设计的。为了保证安全可靠，通过比较疲劳散射描述能力，分析了寿命和疲劳散射模型不确定性对设计曲线构造的影响。根据Ti-64疲劳试验数据，计算了不同模型下的设计曲线。此外，本文还对测试点的个数进行了讨论。最后，提出了一种基于贝叶斯的小样本疲劳曲线设计新方法，该方法比传统方法更具保守性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Influence of life and fatigue scatter model uncertainty on design curve construction

Fatigue scatter is an inevitable phenomenon in fatigue tests which influences life prediction for components or system. In aerospace engineering, aircraft and gas turbine engine components are designed based on design curves. To ensure safety and reliability, influence of life and fatigue scatter model uncertainty on design curve construction is analyzed by comparing capability to describe fatigue scatter. Design curve with different models are calculated based on Ti-64 fatigue tests data. In addition, the number of test points is also discussed in this paper. Finally, a new curve design approach based on Bayesian is proposed for small fatigue tests sample, which is more conservative than traditional way.

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2016 7th International Conference on Mechanical and Aerospace Engineering (ICMAE)

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