The influence of surface roughness characteristics on fatigue stress concentration

摘要：

　　Numerical simulations have been performed to analyze the influence of surface roughness on the fatigue stress concentration with finite element method (FEM).The parameters to characterize the rough surface topology are analyzed,and the inherent relationships between the characteristic parameters of the rough surfaces are described based on statistical theory.The quantitative mathematical expressions for stress concentrations are given in terms of the dimensionless parameters of rough surface for both plane stress and plane strain states,and the consistent form is summarized.The errors for the stress concentration factor (Kt) and the fatigue stress concentration factor (Kf) predicted from the proposed model were within 4% and 1% of those from FEM numerical simulations.Results show that the standard deviation of the valley radius of the surface profile must be taken into account as an important parameter in the prediction of fatigue stress concentration.

关键词： fatigue surface roughness characteristic parameter finite element simulation

作者: J.F.Zhang Q.Li D.Mu X.D.Bian

作者单位: Key Laboratory for Mechanics in Fluid and Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

会议类型: 国际会议

会议名称: International Conference on Airworthiness & Fatigue -7th ICSAELS Series Conference(大飞机安全性能与疲劳国际会议)

会议地点: 北京

会议语种:英文

页码: 107-112

在线出版日期: 2013-03-24（万方平台首次上网日期，不代表论文的发表时间）