1988 年 54 巻 505 号 p. 1716-1722
The relation between the total fatigue life and the fatigue crack initiation life of a single spot weld tensile shear specimen was determined. Based on the results, the reason why the initial stress intensity factor could control the toota fatigue life was discussed. During the investigation, the methods of determination of fatigue crack initiation at the spot weld were developed, and related phenomena were elocidated.