Abstract: Mechanical clinching is a widely used connection technology in different industrial fields. Because it has several advantages such as simple operating process, high efficiency and so forth. Fatigue damage is a main failure mode of the metal mechanical part. In this paper, tensile-shear tests and fatigue test were carried out to characterize the mechanical properties of the clinched joints of titanium alloy. The tensile-shear strength of the clinched joint of titanium alloy was about 36.7% of that of the material itself with equal size. The fatigue strength for titanium alloy sheets joined by clinching was about 46% of that of titanium alloy and about the average load was about 42% of the static strength of clinched joints. Microscopic characteristics showed that the fracture was brittle fatigue fracture. Fatigue abrasive dust with high hardness was produced due to the fretting wear and oxidation which acted as micro abrasive in the process of fretting wear. In this way, it accelerated the abrasion and crack propagation and eventually leaded to fatigue failure.
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2017, Vol. 31 
