TY - JOUR
T1 - Effect of inclusion on subsurface crack initiation and gigacycle fatigue strength
AU - Wang, Q. Y.
AU - Bathias, C.
AU - Kawagoishi, N.
AU - Chen, Q.
N1 - Funding Information:
The authors appreciate Mr JY Berard and Mr G Baudry for their support of this experimental work. This study was sponsored in part by the Japanese Society for the Promotion of Science (JSPS) under Grant No. JSPS-P01042.
PY - 2002/12
Y1 - 2002/12
N2 - The effect of inclusions on crack initiation and propagation in gigacycle fatigue was investigated experimentally and analytically in six high strength low alloy steels. Fatigue testing was performed at very high numbers of cycles through ultrasonic fatigue tests at 20 kHz. Inclusions at subsurface are common sites for fatigue crack nucleation in these alloys when cycles to failure was > 107 cycles. A significant change in the slope of the S-N curve was observed accompanying the transition from surface to subsurface crack initiation. A deterministic model has been developed to predict the total fatigue life, i.e. crack initiation life and crack propagation life, from the measured inclusion sizes. The predicted fatigue strength agreed reasonably well with the experimental results. It is a tendency that smaller inclusions are associated with longer fatigue life. The results demonstrated that the portions of life attributed to subsurface crack initiation between 107 and 109 cycles are > 99%.
AB - The effect of inclusions on crack initiation and propagation in gigacycle fatigue was investigated experimentally and analytically in six high strength low alloy steels. Fatigue testing was performed at very high numbers of cycles through ultrasonic fatigue tests at 20 kHz. Inclusions at subsurface are common sites for fatigue crack nucleation in these alloys when cycles to failure was > 107 cycles. A significant change in the slope of the S-N curve was observed accompanying the transition from surface to subsurface crack initiation. A deterministic model has been developed to predict the total fatigue life, i.e. crack initiation life and crack propagation life, from the measured inclusion sizes. The predicted fatigue strength agreed reasonably well with the experimental results. It is a tendency that smaller inclusions are associated with longer fatigue life. The results demonstrated that the portions of life attributed to subsurface crack initiation between 107 and 109 cycles are > 99%.
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U2 - 10.1016/S0142-1123(02)00037-3
DO - 10.1016/S0142-1123(02)00037-3
M3 - Article
AN - SCOPUS:0036883732
SN - 0142-1123
VL - 24
SP - 1269
EP - 1274
JO - International Journal of Fatigue
JF - International Journal of Fatigue
IS - 12
ER -