Fretting Fatigue and Fracture Mechanism of Fasteners in Composite Mechanical Connected Structures

Abstract

Based on the contact fretting fatigue theory and fatigue tests, the fastener fatigue fracture mechanism of composite large interference fit connection was conducted in this paper. Test results showed that the fatigue fracture mode of composite mechanical connections in large interference fit (1.8% and 3%) were fastener fatigue fracture. Under the impact of cyclic load, fastener fretting wear and damage type of fretting fatigue were generated between blind bolted fastener and composite hole. According to the theory of fretting white layer, the failure mechanism of fastener fatigue fracture was explored, which provided theoretical basis and experimental basis for the design of mechanical connected structure with higher fatigue life.