Abstract
The critical root radius, named as branch point, exists in notch fatigue limit, below which the fatigue limit appears to be independent of the root radius. Two theoretical models were proposed in this paper to discuss the characteristics of critical root radius and notch fatigue limit. The first one was the qualitative model by modifying the Dugdale model for fatigue crack growth from notch tip and it was used to analyze the forming mechanism and notch size dependence of critical root radius. Upon on the above systematical analysis for critical root radius, the second model was presented, based on crack closure concept, to quantitatively predict the notch fatigue limit for various notched specimens. Its effectiveness and capability were demonstrated by fatigue experimental data from ten kinds of materials under different stress ratios.
| Original language | English |
|---|---|
| Article number | 105261 |
| Journal | International Journal of Fatigue |
| Volume | 130 |
| DOIs | |
| Publication status | Published - Jan 2020 |
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All Science Journal Classification (ASJC) codes
- Modelling and Simulation
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
- Industrial and Manufacturing Engineering
Cite this
Revealing the mechanism of critical root radius in notch fatigue limit based on crack closure concept. / Li, Bochuan; Jiang, Chao; Noguchi, Hiroshi; Liu, Long.
In: International Journal of Fatigue, Vol. 130, 105261, 01.2020.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Revealing the mechanism of critical root radius in notch fatigue limit based on crack closure concept
AU - Li, Bochuan
AU - Jiang, Chao
AU - Noguchi, Hiroshi
AU - Liu, Long
PY - 2020/1
Y1 - 2020/1
N2 - The critical root radius, named as branch point, exists in notch fatigue limit, below which the fatigue limit appears to be independent of the root radius. Two theoretical models were proposed in this paper to discuss the characteristics of critical root radius and notch fatigue limit. The first one was the qualitative model by modifying the Dugdale model for fatigue crack growth from notch tip and it was used to analyze the forming mechanism and notch size dependence of critical root radius. Upon on the above systematical analysis for critical root radius, the second model was presented, based on crack closure concept, to quantitatively predict the notch fatigue limit for various notched specimens. Its effectiveness and capability were demonstrated by fatigue experimental data from ten kinds of materials under different stress ratios.
AB - The critical root radius, named as branch point, exists in notch fatigue limit, below which the fatigue limit appears to be independent of the root radius. Two theoretical models were proposed in this paper to discuss the characteristics of critical root radius and notch fatigue limit. The first one was the qualitative model by modifying the Dugdale model for fatigue crack growth from notch tip and it was used to analyze the forming mechanism and notch size dependence of critical root radius. Upon on the above systematical analysis for critical root radius, the second model was presented, based on crack closure concept, to quantitatively predict the notch fatigue limit for various notched specimens. Its effectiveness and capability were demonstrated by fatigue experimental data from ten kinds of materials under different stress ratios.
UR - http://www.scopus.com/inward/record.url?scp=85072283932&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85072283932&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2019.105261
DO - 10.1016/j.ijfatigue.2019.105261
M3 - Article
AN - SCOPUS:85072283932
VL - 130
JO - International Journal of Fatigue
JF - International Journal of Fatigue
SN - 0142-1123
M1 - 105261
ER -