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EFFECT OF NON-PROPORTIONAL OVERLOADING ON FATIGUE CRACK GROWTH

GAO Hua CHEN Youxuan LI Ming Shanghai University of Engineering Science , Shanghai , ChinaCHEN Dehai Shanghai Dalong Machinery , Shanghai , China Associate Professor , Dept.of Materials , Shanghai University of Engineering Science , Shanghai 200051 , China

金属学报(英文版)

The effect of proportional and non-proportional overloading on mode l fatigue crack growth have been studied,and the influences of crack tip plastic zone,crack tip blunting as well as crack closure were discussed.Proportional(model I)overloading may cause more serious crack growth retardation than non-proportional(mixed mode)overloading.Therefore,for estimating the fatigue life of engineering structures to simplify a real overload which may of- ten be non-proportional as a proportional one is not always safe.

关键词: non-proportional overloading , null , null

疲劳裂纹扩展的非比例过载效应

高桦 , 陈友萱 , 李明 , 陈德海

金属学报

本工作研究了比例(Ⅰ型)过载及非比例(复合型)过载对常幅Ⅰ型疲劳裂纹扩展的影响。结果表明:Ⅰ型过载所引起的裂纹滞后扩展效应远较复合型为强。因此,在估算疲劳寿命时将零、构件实际承受的过载(大都为非比例过载)简单地当作比例过载处理,可能会过高地估计寿命,带来不安全因素。文章从Ⅰ型及复合型过载所引起的裂纹钝化、裂端塑性区的形状、尺寸及裂纹闭合等方面讨论了它们对裂纹扩展滞后效应的影响。

关键词: 非比例过载 , fatigue crack growth , mixed mode loading

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