Abstract: The corrosion resistance of sandwich structure self-piercing riveted joint with AA5052-O aluminum alloy as substrate in periodic immersion environment was explored, fatigue performance tests were carried out on samples under different pre-corroded time. According to the three empirical parameters, the S-N curves of samples were fitted by S-N curve fitting method, and the influence of pre-corrosion on the fatigue life of joints was analyzed. In addition, the fatigue fracture was observed by scanning electron microscopy to study the damage characteristics and the micro fatigue failure mechanism of the joints. The results show that pre-corrosion can cause multiple fatigue sources on the joint and accelerate the crack pro-pagation, fatigue cracks of joints are easy to initiate at the defects caused by pre-corrosion. There is a competitive relationship between corrosion damage and mechanical damage during the tests, pre-corrosion significantly affects the fatigue life of joints at low stress levels. In general, the fatigue life of the joint decreases with the increase of the pre-corrosion time. Fatigue failure patterns of the joint include the fracture of the lower plate in the riveting region and the fracture of the lower plate on side of the riveting region. The fatigue source fracture of the joint emerges the characteristics of quasi-cleavage fracture.
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2019, Vol. 33 
