T-shaped connection structure of composite material laminboard

Abstract

The invention provides a T-shaped connection structure of a composite material laminboard, comprising a connecting bottom plate, a honeycomb laminboard and a T-shaped reinforcing block, wherein the honeycomb laminboard is provided with a groove the shape of which is same with the shape of the upper end of a web of the T-shaped reinforcing block; the upper end of the web of the T-shaped reinforcing block is inserted into the groove; and a wing rafter of the T-shaped reinforcing block is in glue joint with the connecting bottom plate. The T-shaped connection structure also comprises two waveform connecting pieces, wherein the two waveform connecting pieces are positioned on two sides of the honeycomb laminboard; the waveform connecting pieces, the T-shaped reinforcing block and the honeycomb laminboard are fastened and connected by bolts; and the waveform connecting pieces and the connecting bottom pate are connected by glue and bolts in a mixing mode. The T-shaped connection structure has the advantages that the flexural rigidity is high; a bigger space is formed between the two waveform plates to bring convenience for overlaying a number of pipelines and subsequently maintaining; stress concentration on a joint can be effectively alleviated; the structural efficiency is improved; the bearing capability is enhanced, and the like. The T-shaped connection structure disclosed by the invention is suitable for mechanical connection between the composite material laminboard in a large-sized structure and other structures.

Description

technical field [0001] The invention relates to a connection structure of composite material sandwich panels, and is especially suitable for the mechanical connection between composite material sandwich panels and other structures in large-scale structures. Background technique [0002] Compared with general engineering materials, fiber-reinforced resin matrix composites have anisotropy in strength and stiffness, lower interlaminar strength and lower ductility, so the load redistribution ability in the stress or strain concentration area of ​​the joint is weaker. According to some data, the mass of joints accounts for about 20%-30% of the mass of the entire structure, and most of the damage (60%-80%) of composite structures also occurs at the joints. Therefore, the connection problem is one of the key technologies that affect the performance of composite materials. Solving the connection problem of composite material structures is of great significance for reducing structura...

AI Technical Summary

Problems solved by technology

Although the bonded connection is strong in shear, it has poor resistance to peeling

When the "T" joint of the bonded composite material is subjected to normal force and peeling force, due to the weak bearing capacity of the adhesive, the load-bearing capacity of these two types is insufficient, and debonding and delamination of the laminate are prone to occur, which ultimately affects Airtightness and load-bearing characteristics. At the same time, because the adhesive damage is not easy to be found in time, it is prone to relatively sudden catastrophic damage, causing heavy losses.

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