| 一种寿命设计曲线构建方法 |
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| 引用本文： | 杨晓光,黄飞,苗国磊,石多奇.一种寿命设计曲线构建方法[J].航空动力学报,2015,30(10):2312-2317. |
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| 作者姓名： | 杨晓光 黄飞 苗国磊 石多奇 |
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| 作者单位： | 北京航空航天大学 能源与动力工程学院, 北京 100191;先进航空发动机协同创新中心, 北京 100191,北京航空航天大学 能源与动力工程学院, 北京 100191,北京航空航天大学 能源与动力工程学院, 北京 100191,北京航空航天大学 能源与动力工程学院, 北京 100191;先进航空发动机协同创新中心, 北京 100191 |
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| 摘 要： | 针对现有建立寿命设计曲线方法的不足,采用容限法建立寿命设计曲线,对比并分析了各种方法的差异.对于大样本的疲劳试验数据,试验结果表明在不同应力水平材料寿命的分散性不同.为此在近似Owen容限法基础上提出了一种包含应力水平的分散性模型建立设计曲线,使其能够满足材料寿命在高应力分散性较小,低应力分散性较大的特点.根据Ti-6246疲劳试验结果,利用该方法计算得到的设计寿命在疲劳载荷为925MPa时提高了146%,在820MPa时减小了60.2%.从而提高了设计的经济性和可靠性.
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| 关 键 词： | 设计曲线 疲劳分散性 容忍限 置信水平 可靠度 疲劳寿命 |
| 收稿时间： | 2014/4/3 0:00:00 |
Approach to construction of fatigue design curve |
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| YANG Xiao-guang,HUANG Fei,MIAO Guo-lei and SHI Duo-qi.Approach to construction of fatigue design curve[J].Journal of Aerospace Power,2015,30(10):2312-2317. |
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| Authors: | YANG Xiao-guang HUANG Fei MIAO Guo-lei and SHI Duo-qi |
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| Institution: | School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;Collaborative Innovation Center for Advanced Aero-Engine, Beijing 100191, China,School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China,School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China and School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;Collaborative Innovation Center for Advanced Aero-Engine, Beijing 100191, China |
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| Abstract: | Tolerance limit concept was used to construct design curves against the deficiencies of the existing methods. Comparative analysis was implemented to evaluate the safety of the design curve. Experimental result shows that fatigue scatter varies with stress levels. Based on approximate Owen tolerance limit, an improved design curve has been developed to comply with the feature of fatigue scatter that becomes small in high stress levels and large in low stress levels. According to the fatigue test results of Ti-6246, the fatigue life derived from the new method increased by 146% at 925MPa and decreased by 60.2% at 820MPa compared with other methods. Reliability and economy can be improved with the new fatigue design curve. |
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| Keywords: | design curve fatigue scatter tolerance limit confidence level reliability fatigue life |
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