Forming Quality and Fatigue Behavior of Self-Piercing Riveted Joints of DP590 and AA6061 Plates

Figure 9

Fracture surface of the lower plate for group AA40 No. 8: (a) macroscopic morphology of fatigue fracture; (b) 1＃regional microstructure; (c) 2＃regional microstructure; (d) 3＃regional microstructure; (e) 4＃regional microstructure.