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A MODIFIED LEFM APPROACH FOR THE PREDICTION OF THE NOTCH EFFECT IN FATIGUE

机译：预测疲劳缺口效应的改进LEFM方法

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Engineered designs usually contain stress-raising details such as holes, fillet, grooves and keyways which are known to have a deleterious effect on the fatigue limit and fatigue lifetimes because of the growth of fatigue cracks emanating from these details. A recent paper has dealt with the behavior of small cracks emanating from one type of stress-raiser, namely holes. In that paper, a modified LEFM approach was used and it involved consideration of elastic-plastic behavior, the Kitagawa effect, and the development of crack closure in the wake of a newly formed crack. The present paper extends this approach to deal with notches of elliptical shape. The proposed approach is validated by comparing predicted and experimental results.
机译：工程设计通常包含应力增加的细节，例如孔，圆角，凹槽和键槽，由于这些细节产生的疲劳裂纹的增长，已知这些细节会对疲劳极限和疲劳寿命产生有害影响。最近的一篇论文处理了一种由应力引起的小裂纹的行为，即孔。在那篇论文中，使用了一种改进的LEFM方法，该方法考虑了弹塑性行为，北川效应以及在新形成的裂纹之后裂纹闭合的发展。本文将这种方法扩展为处理椭圆形的缺口。通过比较预测结果和实验结果验证了该方法的有效性。

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