中国铁道科学2017，Vol.38Issue(5)：22-29,8.DOI:10.3969/j.issn.1001-4632.2017.05.04
基于小样本数据的构件疲劳破坏全寿命区S-N曲线
S-N Curve of Fatigue Failure Life Cycle of Component Based on Small Sample Data
摘要
Abstract
The applicability of traditional S-N curve in fatigue failure life cycle of component was not strong.The high cycle fatigue tests of HRB400 high strength steel bars connected by flash butt welding were carried out based on single point method,and a series of small sample data were got.Accordingly,double-logarithmic double-dogleg S-N curve was studied and proposed which was suitable for the fatigue failure life cycle of component.The improved Chauvenet criterion was proposed to select the test data of the first segment of dogleg line,and then the equation for the first segment was obtained according to a linear regression principle.Based on the gradient obtained by three-parameter exponential function curve and the fatigue strength determined by staircase method of the second segment,the equation for the second segment was worked out.Double-logarithmic double-dogleg S-N curve suitable for the fatigue failure life cycle of component was obtained by the simultaneous equations of two segments.On this basis,the calculation method considering dependability and reliability was further studied and proposed for double-logarithmic double-dogleg S-N curve suitable for the fatigue failure life cycle of component.关键词
构件/疲劳破坏/全寿命/S-N曲线/小样本/双对数双折线/一元线性回归/升降法Key words
Component/Fatigue failure/Life cycle/S-N curve/Small sample/Double-logarithmic double-dogleg/Unary linear regression/Staircase method分类
交通工程引用本文复制引用
盛兴旺,郑纬奇,雷佶洲..基于小样本数据的构件疲劳破坏全寿命区S-N曲线[J].中国铁道科学,2017,38(5):22-29,8.基金项目
中国铁路总公司科技研究开发计划项目(z2014-038) （z2014-038）
