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Research of Fatigue Limit and Stress Concentration on Structural Steel with Double-Notches

机译：双缺口结构钢的疲劳极限和应力集中研究

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摘要

The fatigue limit of parts and components that have the multi-notches is important data for the design and manufacture of machinery and traffic equipment which are operated under the high speed or pressure. In this paper the rotating bending fatigue tests have been carried out to investigate the fatigue limit of specimen with double-notch that is constructed of step and blind hole, and analyzed the effect of stress concentrations at the double-notched bottoms on the fatigue limits, using three-dimensional elastic finite element method. Firstly, the fatigue tests of 8 group specimens have been performed for examining the of fatigue limits of the single-notched specimen and double-notched specimen, respectively. Additionally, the stress field interactions between two stress fields by the blind hole notch and step are discussed using three-dimensional elastic finite element method. The main results obtained in this study are as follows: The fatigue limit of the double-notched specimen are down comparison with the fatigue limit of the single-notched specimen; the fatigue limit of the double-notch specimen is insensitive to distance between the blind hole and step for the low carbon structure steel with better ductility; for the high-strength steel, superposition and intensification of the stress concentration by the blind hole and step mutually may be avoided so that their adverse effects on the fatigue strength may be become to minimize, as take appropriate distance between the blind hole and step. The results are significant for the design of engineering design of the multi-notched parts, and the study of fatigue strength.
机译：具有多槽口的零部件的疲劳极限是设计和制造在高速或高压下运行的机械和交通设备的重要数据。本文进行了旋转弯曲疲劳试验，以研究由阶梯和盲孔构成的双缺口试样的疲劳极限，并分析了双缺口底部应力集中对疲劳极限的影响，使用三维弹性有限元方法。首先，进行了8组试样的疲劳试验，分别检查了单缺口试样和双缺口试样的疲劳极限。另外，利用三维弹性有限元方法，讨论了盲孔切口和台阶在两个应力场之间的相互作用。本研究获得的主要结果如下：双缺口试样的疲劳极限比单缺口试样的疲劳极限低。对于低延展性较好的低碳结构钢，双缺口试样的疲劳极限对盲孔与台阶之间的距离不敏感。对于高强度钢，通过在盲孔和台阶之间保持适当的距离，可以避免盲孔和台阶之间的应力集中的叠加和加剧，从而使得它们对疲劳强度的不利影响最小化。该结果对多槽口零件的工程设计和疲劳强度的研究具有重要意义。

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  • 来源
    《Key Engineering Materials》 |2010年第2010期|849-852|共4页
  • 作者

    Wang Sheng-wu; Sun Shu-juan; Wen Ai-fing; Wang Wei-da; Nishida Sin-ichi;

  • 作者单位

    Schooi of Civil and Safety Engineering, Dalian Jiao tong University, Dalian 116028, China;

    Instute of Information Engineering, Dalian Jiao tong University, Dalian 116052, China;

    School of Mechanical Engineering, Dalian Jiao tong University, Dalian 116028, China;

    Graduate school of Dalian Jiao tong University, Dalian 116028, China;

    Faculty of Mechanical Science & Engineering, Saga University, Saga 740-8502, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    double-notch; fatigue limit; stress concentration;

    机译：双缺口疲劳极限应力集中;

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