Abstract: The fatigue test of single lap self-piercing riveted joints in TA1 titanium alloy were performed to investigate the fai-lure mode of the joints. The difference of fretting wear on rivet surface and fretting wear mechanism of the joints were studied by scanning electron microscope (SEM) and energy dispersive X-ray (EDX) line scanning. The validity of fatigue data was verified by Weibull distribution. The results showed that the main failure mode of the joints was the upper sheet fracture, the failure mode of the joints with high fatigue cycle were the upper sheet fracture, the failure mode of the joints with low fatigue cycle were the upper sheet and bottom sheet fracture. Fretting debris included O, Ti, Zn and Sn elements, the degree of fretting wear on rivet head was severer than that of rivet shank. Severe delamination, fretting debris accumulation and micro cracks initiation occurred in fretting wear region. Large amount of micro cracks near the fracture part initiated and propagated along depth and width directions during fretting wear process and shear force, finally caused the fatigue failure of the joints.
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2017, Vol. 31 
