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首页> 外文会议>Proceedings of International conference on airworthiness amp; fatigue >The influence of surface roughness characteristics on fatigue stress concentration
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The influence of surface roughness characteristics on fatigue stress concentration

机译：表面粗糙度特性对疲劳应力集中的影响

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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.
机译：通过有限元方法（FEM）进行了数值模拟，分析了表面粗糙度对疲劳应力集中的影响。分析了表征粗糙表面拓扑的参数，并描述了粗糙表面特征参数之间的内在联系。根据平面理论和平面应变状态下粗糙表面的无量纲参数，给出了应力集中的定量数学表达式，并总结了一致形式。应力集中系数（Kt）和该模型预测的疲劳应力集中系数（Kf）在有限元数值模拟的4％和1％之内。结果表明，必须将表面轮廓的谷半径的标准偏差作为重要参数在疲劳应力集中的预测中。

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  • 来源
  • 会议地点 Beijing(CN)
  • 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;

    Key Laboratory for Mechanics in Fluid and Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;

    Key Laboratory for Mechanics in Fluid and Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;

    Key Laboratory for Mechanics in Fluid and Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 飞机的疲劳;
  • 关键词

    fatigue; surface roughness; characteristic parameter; finite element simulation;

    机译：疲劳;表面粗糙度;特征参数;有限元模拟;

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