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首页> 外文期刊>Mechanical systems and signal processing >Static behaviour of a shaft with an elliptical crack
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Static behaviour of a shaft with an elliptical crack

机译：椭圆形裂纹轴的静态行为

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摘要

Cracks in mechanical components produce changes in their behaviour like increases of displacements or decreases of frequencies due to the flexibility increase. Some works related to the analysis of the behaviour of cracked shafts consider the front of the transversal fatigue cracks to be straight, but experience says that the front of these kind of cracks is approximately elliptical. Many expressions have been given for the flexibility of a cracked shaft with a straight front whereas, for elliptical cracks, only an approximate expression for the flexibility has been found in the literature. In the present work, flexibility expressions for cracked shafts having elliptical cracks are obtained, based on the polynomial fitting of the stress intensity factors, taking into account the size and shape of the elliptical cracks showing results according with reality. The static displacements in bending of the shaft for different support conditions have been calculated. The comparisons between these results and those obtained by FEM analysis and by experimental tests show that the closed-form expressions for the flexibility give us a very good approximation to the behaviour of the cracked shaft.
机译：机械组件中的裂纹会由于挠性的增加而改变其行为，例如位移增加或频率降低。一些与裂纹轴性能分析相关的工作认为横向疲劳裂纹的前部是笔直的，但经验表明此类裂纹的前部近似为椭圆形。对于具有笔直前部的裂纹轴的挠性，已经给出了许多表达式，而对于椭圆形裂纹，在文献中仅发现了挠性的近似表达式。在目前的工作中，基于应力强度因子的多项式拟合，考虑到椭圆裂纹的大小和形状，可以根据实际情况获得具有椭圆形裂纹的裂纹轴的挠性表达式。计算了不同支撑条件下轴弯曲时的静态位移。这些结果与通过FEM分析和实验测试获得的结果之间的比较表明，挠性的闭合形式使我们可以很好地近似裂纹轴的性能。

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  • 来源
    《Mechanical systems and signal processing》 |2011年第5期|p.1674-1686|共13页
  • 作者

    L. Rubio; B. Munoz-Abella; G. Loaiza;

  • 作者单位

    Department of Mechanical Engineering, Universidad Carlos III of Madrid, Avda. de la Universidad, 30, 28911 Leganes, Madrid, Spain;

    Department of Mechanical Engineering, Universidad Carlos III of Madrid, Avda. de la Universidad, 30, 28911 Leganes, Madrid, Spain;

    Department of Mechanical Engineering, Universidad Carlos III of Madrid, Avda. de la Universidad, 30, 28911 Leganes, Madrid, Spain;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    flexibility; shafts; elliptical fatigue cracks;

    机译：灵活性;轴椭圆疲劳裂纹;

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