Abstract: The optimum riveting parameters were obtained through self-piercing riveting (SPR) contrast tests, and the SPR joints in dissimilar sheets about TA1 titanium alloys were fabricated with the optimum parameters. The mechanical properties were studied with the static tests and fatigue tests, and the S-N curves were fitted by the fatigue empirical formula of three parameters. Finally, the fracture analysis and spectrum analysis were conducted with scanning electron microscope and alpha ray spectrometer to study the fatigue failure mechanisms. The results showed that the peak load of STH joints was superior to that of STA joints. STH joints had a better fatigue life at low fatigue loads, but STA joints was better at high fatigue loads. The fatigue failure modes of STA joints were the locked sheet fracture, and two failure modes occurred in STH joints. The severe fretting wear taken place between the two sheets or the contact area of the rivet and sheets was the main cause of the fatigue crack initiation.
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2017, Vol. 31 
