A new composite sandwich panel connection structure without metal connectors and its design method

Abstract

The invention discloses a novel metal-free connector composite material sandwiched plate connecting structure and a design method thereof. The novel metal-free connector composite material sandwiched plate connecting structure is characterized by comprising glass fiber cloth (1A), a PVC foam core (1B), a composite material sandwiched plate (1), a composite material connector (2) and a composite material reinforcing rib (3), wherein the glass fiber cloth (1A) is layered in a crossed mode respectively at 0 degree and 90 degrees by surrounding the PVC foam core (1B) to prepare the composite material sandwiched plate (1), the composite material connector (2) and the composite material reinforcing rib (3), and a composite material sandwiched plate connecting structure is prepared by secondary bonding. The novel metal-free connector composite material sandwiched plate connecting structure can be used for structures with special requirements, such as high rigidity, high strength, and electromagnetic wave invisibility. Compared with a traditional connecting structure, the novel connecting structure disclosed by the invention has the characteristics of high connecting efficiency, compact structure, capability of meeting the electromagnetic invisibility requirement, simple and flexible molding technology and the like, and has wide application prospect in national defense and industrial equipment.

Description

technical field [0001] The invention relates to the technical field of full composite material sandwich structure connection, in particular to the metal-free connection technology of the same or a kind of composite material sandwich panels. Background technique [0002] Fiber-reinforced composite materials have a series of excellent properties such as high specific strength, high specific modulus, fatigue resistance, corrosion resistance, designability, low density, thermal expansion coefficient and good dimensional stability, and have been widely used in aviation, aerospace, and navigation. and other fields. [0003] Despite the continuous development of composite material forming technology, the integrity of composite material structure has been greatly improved. However, due to the technical level of composite material forming technology, structural requirements and road transportation requirements, composite material components are inevitably connected with parts. From ...

AI Technical Summary

Problems solved by technology

[0005] The mechanical connection needs to drill holes in the connection area, and the opening causes delamination around the hole, resulting in lower extrusion strength in the connection area (the strength criterion for the design of composite bolted connections is extrusion strength), resulting in increased thickness and weight in the connection area. increase, so that the weight reduction effect of composite materials is greatly reduced

At the same time, the existence of pores leads to a decrease in the watertightness and airtightness of the structure, which cannot meet the normal use requirements.

The most important thing is that metal is a total reflection material, and the use of metal connectors cannot achieve electromagnetic wave stealth

Images