HIGH PERFORMANCE SLEEVED INTERFERENCE FASTENERS FOR COMPOSITE APPLICATIONS

摘要

A fastener adapted to pass through aligned holes through workpieces is disclosed The fastener includes a pin member having a transition portion wherein the diameter of the transition portion decreases radially as it extends from the smooth cylindrical shank portion to the threaded portion The fastener may also comprise a sleeve member and a clamping means The clamping means includes a collar, a nut, or any other possible clamping means In exemplary embodiments, the workpieces can be formed with a plurality of materials, the materials including composite, metallic, or composite/metallic structures, any combination thereof In particular embodiments, the fastener has interference capability of 0 0005 to 0 0100 inches in composite structures without risk of composite delamination or damage As a result of the fastener interference, gaps between the fastener and the structure are eliminated thereby providing good electrical conductivity between components As a result, the potential for electrical sparks is reduced, providing a safer fastener for use with aerospace applications.