For the working conditions of the ball eye on the overhead line, it is the first time to carry out the fatigue test which bases on the following data:r = 0.25, S = 500 MPa, then curving the plotting of S-N, analyzing the fatigue mechanism and characteristics of the ball eye.
From the macro point of view, it is the first time to analyze the mechanical properties and fatigue fracture characteristics of the ball eye in the process of fatigue evolution.
From the microscopic point of view, it is the first time to analyze movement law and evolution characteristics of grain in the process of fatigue failure.