Composite material and metal connection structure and forming method thereof

Abstract

The invention relates to a composite material and metal connection structure comprising a metal connector and a composite material connector. The composite material and metal connection structure is characterized in that connected parts of the metal connector and the composite material connector are provided with thin pins; one end of every thin pin is fixedly connected to the metal connector, and the other end of every thin pin is inserted into the composite material connector. The invention further discloses a forming method of the connection structure. The forming method includes the steps of a, fixedly connecting one end of every thin pin to the metal connector; b, placing the other end of every thin pin into composite material, and not cutting off reinforcing material of fiber with the direction matching with the shape of the thin pins; c, solidifying the composite material to form. The composite material and metal connection structure and the forming method thereof have the advantages that the composite material of fiber is not cut off by the thin pins on the metal connector, the problem of hole-edge stress concentration caused by hole making is avoided, glue cracking and laminate outside layering can be suppressed, the connection structure has the advantages of both the glued structure and the mechanically connected structure, and defects in the glued structure and the mechanically connected structure are largely overcome.

Description

technical field [0001] The patent of the invention relates to a connection method between heterogeneous materials, especially a connection technology between fiber-reinforced composite materials and metal materials. Background technique [0002] Compared with traditional metal materials, fiber-reinforced composite materials (including resin-based carbon fiber-reinforced composite materials, resin-based glass fiber-reinforced Composite materials, as well as metal matrix and ceramic matrix composite materials, etc.) have high specific strength, high specific stiffness, high temperature resistance, corrosion resistance, fatigue resistance, good damping and shock absorption, good damage safety, designable performance, anisotropy The advantages of multi-functionality and developability make composite materials more and more used in engineering fields such as aviation, aerospace, vehicles, ships, construction, petroleum, bridges, wind power and construction. However, compared wit...

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Problems solved by technology

However, the metal-composite mechanical connection also has the following disadvantages: 1) Since the composite fiber and metal material are cut off during the hole making process, the stress concentration at the edge of the hole is seriously concentrated, so the thickness of the composite material and the metal connection has to be increased, which leads to Increased weight; 2) The use of a large number of fasteners requires a lot of hole making and assembly work, high cost, long cycle, and increased structural weight; 3) Fasteners and holes may cause potential corrosion problems; 4) Due to the different mechanical properties of composite materials and metal materials, the requirements for assembly parameters such as tightening torque and interference fit are also different, but these parameters are usually the same in the mechanical connection structure of composite materials and metal hybrid structures

[0004] Compared with mechanical connection, the structural weight gain of glued joint is smaller, the stress concentration at the joint part is lower, and the fatigue resistance is good. However, due to the process characteristics of glued joint, it has the following disadvantages: 1) The mechanical properties of glued structural parts are scattered 2) Sensitive to external force on the surface; 3) Poor resistance to heat and humidity, and the adhesive layer has the risk of aging and failure; 4) Brittleness, sudden failure and unpredictable failure; 5) Difficult to detect; 6) Difficult to disassemble

[0005] The rubber-screw hybrid connection overcomes the shortcomings of the previous two connection methods and brings their advantages into full play, but the use of fasteners increases the cost and weight of the structure, which weakens the advantages brought by the use of composite materials to a certain extent

The interlaminar cracking performance of composite bonded joints can be increased by directly embedding cured fiber or metal stubs with a diameter of 0.2-1mm in the prepreg of the bonded joint, and then curing the prepreg to form a laminate , but the fibers or short metal rods used in this process cannot be embedded in metal, so it is not suitable for the hybrid connection structure of metal and composite materials

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