A kind of fiber-reinforced polymer-based composite material T-joint and its manufacturing method

Abstract

The invention discloses a fiber-reinforced polymer matrix composite T-joint and a making method thereof. The T-joint is formed by a vertical web plate, a bionic knuckle area and a lower wall panel, wherein two ends of the bionic knuckle area are respectively fixedly connected with the vertical web plate and the lower wall panel. According to the invention, the vertical web plate is connected with the lower wall panel by the bionic knuckle area with multiple functions, so that the tensile property and the bending resistance of the T-joint can be improved, the T-joint has good toughness and damage tolerance, and a stress concentration effect is relieved; and a malposition structure formed by a composite unit section in the knuckle area can effectively obstruct propagation of cracks, and therefore, the damage tolerance of a connecting part is improved, and the risk of disastrous structural damage of the T-joint can be reduced.

Description

technical field [0001] The invention relates to a joint of composite material, in particular to a T-shaped joint of fiber-reinforced polymer-based composite material and a manufacturing method thereof. Background technique [0002] In the design and manufacture of ships and aircraft, a large number of composite material parts need to be used. Since composite materials are different from metal materials and single polymers, they have strong anisotropy, and their connectivity issues have received extensive attention. . A typical connection form of composite parts is a T-joint, which is widely used in the aerospace and shipbuilding industries. The parts of the T-joint include: the connection between the bulkhead and the skin, the connection between the wing beam and the skin, and The connection between the reinforcement plate and the skin, etc. The traditional T-joint of composite materials is made by mechanically connecting the vertical web and the lower wall through screws ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the lack of load-bearing fibers in the above-mentioned existing T-shaped joints, which will destroy the stress conduction between the vertical web and the lower wall plate, and easily generate stress concentration. The connection method will cut off the reinforcing fibers inside the composite material. Inhomogeneous stress distribution is caused, and the structure of the T-joint is easily damaged, and a fiber-reinforced polymer matrix composite material T-joint and its manufacturing method are provided.

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