Influence of interference-fit size on bearing fatigue response of single-lap carbon fiber reinforced polymer/Ti alloy bolted joints

Fretting accelerates damage of mechanical joint; however, the interference-fit technology which makes an oversized fastener installed into a hole has been a method for durability enhancement. An experimental investigation was conducted to determine the effect of interference-fit size on the fretting fatigue life, hole elongation, and circumferential strain of carbon fiber-reinforced polymer(CFRP)/Ti alloy bolted joints. The relationship between interference-fit sizes and fretting fatigue life with various stress levels as well as the hole elongation variation is obtained. The circumferential strains of CFRP hole are investigated during dynamic loading, and the relationship between circumferential strain evolution and interference-fit size is presented.