Abstract
Low cycle fatigue tests were performed to investigate the effect of notch shape for an aluminum alloy A6061-T6. The normal notched cylindrical specimen and the one with protuberances were employed. The total strain range from 0.007 to 0.03,which includes the strain levels for the extremely low cycle fatigue, was applied at the net section. The fracture ductility of the material employed is a main factor dominating the fatigue life. The fatigue life depends strongly on the total strain range at the notch root. The stress triaxiality at the net section has a strong effect on the fatigue life when a total stress range is applied.
