High-Cycle Notched Fatigue

Lukas, P., Kunz, L. Influence of notches on high cycle fatigue life. Mat. Sci. Eng. 47, 93... 

High- and low-cycle fatigue data for smooth and notched specimens of Ti-6211 tested in air and in salt water exhibited a decrease in the fatigue strength for notched specimens at all cychc hves. The Severn River salt water, however, had no significant detrimental effect. The notch effect was... 

Fatigue strength is sensitive to stress concentration such as that caused by notches or sharp corners. It depends on the stress frequency - its effect at low frequencies is much more severe, and therefore failure can occur earlier than that predicted using high-frequency tests. The number of cycles to failure decreases with increasing temperature. 

It can be concluded that the geometry considered is not capable to withstand fatigue for more than 10 cycles. It will be necessary, at least, to increase the shoulder fillet radius that is too small, resulting in a notch factor too high. 

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