Aircraft wing box using grid structure and design method

Abstract

The invention relates to an aircraft wing part and especially to an aircraft wing box using a grid structure and a design method thereof. The aircraft wing box comprises grid ribs and skin panels; the skin panels wrap the outer sides of the grid ribs so as to form the aircraft wing box; and the aircraft wing box is characterized in that the grid ribs and a plurality of reinforcing ribs mutually intersect and form grid configuration, the grid ribs and the skin panels are both made of a plurality of layers of fiber reinforced composite laminates, the skin panels are fixed at the outer sides of the grid ribs and the grid ribs are made of eight layers of fiber reinforced composites laid at different angles. According to the invention, the grid ribs and the skin panels in a shape of an equilateral triangle are used, and compared to traditional wing boxes, the aircraft wing box provided in the invention has the following advantages: more superior stress distribution under the action of external load can be obtained, higher specific strength, specific rigidity and structural efficiency are obtained, the phenomenon of local stress concentration is reduced, weight of the structure is decreased, dangerous point stress which easily causes a composite material to lose efficacy is reduced, and bearing capacity and the fatigue life of the structure are improved.

Description

technical field [0001] The invention relates to an aircraft wing component, in particular to an aircraft wing box section adopting a grid structure and a design method thereof. Background technique [0002] The concept of grid reinforced structure was first proposed by McDonnell Douglas in the 1970s. Compared with the traditional structure, the grid structure has a large section moment of inertia, good bending resistance and buckling resistance, and high structural efficiency. In addition, the grid structure The reinforcing ribs of the structure are relatively independent, and the cracks are not easy to propagate, and the overall performance is good. The traditional wing box structure adopts structures such as skins, stringers, spars, support plates, etc., usually made of hard aluminum alloy. The skin and the skeleton are used as the main force-bearing parts to transmit the torque load, and the stringers are used to improve the stiffness of the skin. As the aerodynamic load...

AI Technical Summary

Problems solved by technology

The design of modern aircraft raises the problem of large structural scale and ultra-light structure. The traditional wing box structure mainly uses composite materials to meet the requirements of mechanical properties such as weight reduction, high load-carrying and structural rigidity. However, its structural load distribution There are still obvious defects, and it is impossible to achieve an efficient combination of weight reduction and load carrying

As a new type of high-efficiency structure, the advanced composite grid structure has a good application prospect in aviation and aerospace structures, but it has not been applied in the main bearing parts of aerospace vehicles so far.

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