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· 48 · 机械 2001 年第 28 卷第 5 期
球墨铸铁材料疲劳寿命的统计分布
苏彦江, 王光钦, 高庆, 黄郁仲
(西南交通大学力学系,四川成都 610031)
摘要:对球墨铸铁材料在对称拉压循环载荷下的疲劳寿命统计分布规律进行了研究。在进行材料疲劳试验的基础上对
疲劳寿命试验数据进行了失效率估计并用概率纸图法进行了分布的拟合性检验和参数估计,综合考虑疲劳寿命分布的总体
拟合效果和是否符合疲劳失效机制两个方面研究了该材料疲劳寿命的合理分布。结果表明,球墨铸铁材料的疲劳寿命服从
Weibull 分布。
关键词:球墨铸铁;疲劳寿命;失效率;Weibull 分布
中图分类号:TB114. 3 文献标识码:A 文章编号:1006 - 0316(2001) 05 - 0048 - 03
Ξ Study on statistical distribution of fatigue lifetime for nodular cast iron
SU Yan jiang , WANG Guang qin , GAO Qing , HUANG Yu zhong
(Department of mechanics , Southwest Jiaotong University , Chengdu 610031 , China)
Abstract : The distribution properties of fatigue life of Nodular cast iron in cyclical stresses(stress ratio R = - 1) were studied. Based on
the fatigue life test of nodular cast iron ,the failure rates were estimated and the lifetime distribution examination and distribution parameter esti
mation was done by graphical approach. The rational life distribution was determined after considering synthetically overall fitting effect and con
sistency to failure mechanism. The result indicated that the 2 - Weibull distribution is the rational life distribution of Nodular cast iron.
Key words : nodular cast iron ; fatigue life ; failure rate ; weibull distribution
球墨铸铁材料由于其铸造简单、经济及减震耐次,用概率纸图法考察了对数正态分布、Weibull 分
磨等优点被运用于如柴油机曲轴等机械零部件上。布和最大 I 型极值分布对给定失效数据的总体拟合
由于材料疲劳性能固有的分散性,研究该类材