| 疲劳寿命估算中的模糊性研究 |
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| 引用本文： | 王旭亮,聂宏.疲劳寿命估算中的模糊性研究[J].机械科学与技术(西安),2008,27(9). |
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| 作者姓名： | 王旭亮 聂宏 |
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| 作者单位： | 南京航空航天大学,航空宇航学院,南京,210016;南京航空航天大学,航空宇航学院,南京,210016 |
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| 摘 要： | 针对工程中构件疲劳寿命估算存在的模糊现象,引入模糊理论中的隶属函数来描述疲劳极限附近的应力对构件造成损伤的模糊性,提出了应力模糊带的概念。并根据疲劳极限与应力模糊带边界的位置关系,将模糊带类型分为安全型、经济型和兼顾型。算例证明:将模糊理论应用于疲劳寿命分析中可以大大提高疲劳寿命预测的精度;选用安全型模糊带和升半正态分布隶属函数,且a=0.6σr,k=0.5时,与忽略模糊性的传统疲劳寿命预测方法相比误差可以减小38.7%。
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| 关 键 词： | 疲劳寿命 隶属函数 应力模糊带 疲劳损伤 模糊理论 |
A Study of the Fuzziness in Fatigue Life Estimation |
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| Wang Xuliang,Nie Hong.A Study of the Fuzziness in Fatigue Life Estimation[J].Mechanical Science and Technology,2008,27(9). |
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| Authors: | Wang Xuliang Nie Hong |
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| Abstract: | For the fuzzy phenomenon during fatigue life estimation in engineering,membership function is used to denote the fuzziness of the fatigue damage by the stress nearby the fatigue limit.The concept of fuzzy zone of stress is put forward,and is classified as safety fuzzy zone,economy fuzzy zone and compatibility fuzzy zone by the relative position of fatigue limit and edges of the fuzzy zone of stress.The results of calculations show that the method can greatly improve the accuracy of fatigue life estimation.Choosing safety fuzzy zone and increasing half normal distribution in the calculation example with parameters a=0.6σr and k=0.5,the error can be reduced by 38.7% compared with the traditional fatigue life estimation method of ignoring fuzziness. |
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| Keywords: | fatigue life membership function fuzzy zone of stress fatigue damage fuzzy theory |
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