An Experimental Research On One Bolt Connection Performance Of Composite Material

Along with raw materials cost down, molding technology constant progress and theperformance improvement, composite material has been widely used and developed in energy,aviation, shipping, wind power and other high-tech areas. At the same time, the structure ofthe composite material is more and more complex, and the structure connection problem isalso inevitable. As for composite material connection structure design, the joint is a relativelyweak link, and the connection collapse is the main reason for the failure of the structure,especially some important connection collapse failure, it may endanger the safety andreliability of the whole structure. This paper explores and researches the connectionperformance of laminated composite bolt, and the main contents are as follows:(1) use VARI (vacuum assisted resin infusion) to manufacture glass fiber which is treatedas the specimen in the composite bolted connection tensile test. Through practical operation,improve VARI production techniques, put forward the improvement methods, make itsoperation more convenient, and consequently improve the efficiency of the compositematerials manufacturing and the quality of the products;(2) study the influence of bolt tightening torque on its connection performance byexperiment;(3) study0°and90°failure strength and mode of laminated composite single boltconnection of sole fiber by experiment, and contrast the difference between them;(4) study0°and90°failure strength and mode of laminated composites single boltconnection of hybrid fiber by experiment, compare the results with the sole fiber, and gain thedifferences;(5) study0°,±45°and90°failure strength and mode of laminated composite singlebolt connection of hybrid fiber by experiment, and analyze the difference after adding the±45°layer;(6) with plentiful experiments, the paper draws a conclusion that when the90°layeroccupies10%, it should concentrate on slowing the curve change of factor C with thedifferent proportions of45°layer, and simplify strength calculation method for theengineering application.