Abstract
Fatigue strength and life tend to decrease due to the stress concentration. To examine notch effect quantitatively, it has been paid attention to the relationship between maximum stress at the notch bottom and stress gradient. However, effective critical volume might be a main factor for inclusion induced fatigue failure in the case of high strength steel whose failure dominated by inclusions. The aim of the present study is to experimentally investigate the difference of fatigue strength between un-notched specimen and notched specimen in high strength steel.
