An Analysis of the Behavior of Small Fatigue Cracks Emanating from Stress Concentrators

Abstract:

The plastic zone size (PZS) at the tip of a crack emanating from stress concentrators subjected to uniform tension was calculated based upon the Dugdale model. A method was proposed for the prediction of fatigue notch effects in terms of the McEvily method that has widely been used for the analysis of small fatigue crack growth. In modifying this method, the elastic-plastic effects due to stress concentration were taken into account using the values of PZS calculated in this study. The results predicted by this method accounted successfully for the behavior of small fatigue cracks near the threshold levels observed in the fatigue tests conducted using notched steel specimens.

• Periodical: Key Engineering Materials (Volumes 385-387)
• Pages: 641-644
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.385-387.641
• Online since: July 2008
• Authors: Satoshi Ikeda, Daisuke Koyanagi, Masahiro Endo, Yuki Sakamoto
• Keywords: Dugdale Model, McEvily Method, Non-Propagating Crack, Notch Effect, Plastic Zone Size, Stress Concentration

References

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