Study of Multirow Highly Loaded Bolt Joints in.Composite Wing Structure

摘要

The purpose of this study is to develop reliable methods for the design, analysis, and evaluation of multirow highly loaded bolt joints of composite structures. Several different fastener flexibility evaluation methods are compared for the single-shear and double-shear joints with fasteners of various types and sizes. The design specimens used in this study were made from stitched/resin film-infused carbon fiber composite material, and the load intensities were on the order of 50 to 60 kips per in. (87598.5 to 105118.2 N/cm), within the specimen width for 0.94-in. (2.39 cm) thick pad-up skin. Linear and nonlinear finite element analyses were performed on both compression and tension high-load specimens. Actual tests were performed, and results are compared with the predictions from the finite element analysis model. As the results indicate, in composite structures the uniform bolt loading is crucial to the design and flexibility calculations of multirow highly load bolt joints.