Abstract: Fatigue experiments were carried out on the self-piercing riveted (SPR) joint of aluminum alloy and the foam metal sandwich structures. Based on the three parameter empirical formula, S-N curve fitting method was used to draw the F-N curves of the joints. The fatigue life of the joints and the influence of the metal foam interlayers on the fatigue properties of the SPR joint were analyzed. The fatigue failure fracture of the joints was observed by scanning electron microscope (SEM), and the microscopic failure mechanism was analyzed. The results show that the metal foam interlay reduces the fatigue life of the SPR joint, and different metal foam has the different influence on fatigue performance of SPR joint. Under the high fatigue load, the copper foam sandwich joint has better fatigue performance. The fatigue failure modes of the three groups of joints are the lower sheet fracture, and the cracks easily occur in the locked region under the high fatigue load. The crack initiates at one side of the lower sheet under the low fatigue load, and extends to the other side of the sheet along the underside of the locked region.
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2018, Vol. 32 
