TY - JOUR
T1 - Essential structure of S-N curve
T2 - Prediction of fatigue life and fatigue limit of defective materials and nature of scatter
AU - Murakami, Yukitaka
AU - Takagi, Toshio
AU - Wada, Kentaro
AU - Matsunaga, Hisao
N1 - Funding Information:
The authors would like to thank Prof. Darrell Socie of University Illinois for his useful discussion and comments throughout completing this paper. The authors are grateful to Dr. Takeshi Horikawa, Emeritus professor of Ryukoku University, for useful discussion on the failure of modified Miner's rule under the high-low stress and sequence combination under step loading fatigue test. The authors are grateful also to Dr. Yoichi Yamashita of IHI for useful discussion on the difference between the very high cycle fatigue failure from nonmetallic inclusions, essentially small crack problems, and the fatigue life in long crack problems. The discussion with Dr. Yamashita was successfully reflected in the present paper. The authors would like to thank Dr. Yoshihiro Fukushima for technical assistance with the experiments.
Publisher Copyright:
© 2021 The Authors
PY - 2021/5
Y1 - 2021/5
N2 - Historically, S-N curve has been expressed in the form of an exponential relationship between applied stress σ and number of cycles to failure Nf. This paper elucidates the essential structure of S-N curve based on the prediction method for fatigue life and limit of materials containing defects from the viewpoint of mechanics of small crack. The extended application of the proposed method to step loading and variable amplitude loading is discussed. The question about the applicability of Miner's rule is also discussed from the viewpoint of continuous decrease in fatigue limit with number of stress cycles and crack growth.
AB - Historically, S-N curve has been expressed in the form of an exponential relationship between applied stress σ and number of cycles to failure Nf. This paper elucidates the essential structure of S-N curve based on the prediction method for fatigue life and limit of materials containing defects from the viewpoint of mechanics of small crack. The extended application of the proposed method to step loading and variable amplitude loading is discussed. The question about the applicability of Miner's rule is also discussed from the viewpoint of continuous decrease in fatigue limit with number of stress cycles and crack growth.
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U2 - 10.1016/j.ijfatigue.2020.106138
DO - 10.1016/j.ijfatigue.2020.106138
M3 - Article
AN - SCOPUS:85099629035
SN - 0142-1123
VL - 146
JO - International Journal of Fatigue
JF - International Journal of Fatigue
M1 - 106138
ER -