The Connection Methods Of Carbon Fiber Products

Carbon fiber composite material is a new type of structural material, which is characterized by high strength, high stiffness and light weight. When used to manufacture aircraft structural parts, in addition to other research work, it is also necessary to solve the problem of its connection with other components.

This test aims to explore the structurally applicable connection forms of carbon fiber composite materials and examine the characteristics of different connection forms, laying a foundation for the design and application of composite component connections.This time, only tensile and shear tests of carbon fiber composite material connection samples were conducted.

There are six types of connection forms: screw joints, rivet joints, locally reinforced screw joints, glue joints, glue-rivet hybrid connections, and glue-screw hybrid connections. Except for bonding, the connecting materials are all aluminum plates with a thickness of 2.5 mm.

Screw Connection

Including bolted joint tests on aluminum plates with two thicknesses: 1.5 mm and 2.0 mm. This was done for comparison with the composite material connection test, and there were also three different lay-up forms of carbon fiber composite bolt-joint tests to compare the bolt-joint properties of different lay-up forms.

Riveting

Including riveting tests on carbon fiber composites using three different rivets (countersunk rivets, raised head rivets, high shear rivets).

Locally reinforced screw joint test: refers to the screw joint test of carbon fiber composite materials reinforced with titanium sheets and glass cloth.

Glue

Including bonding tests of carbon fiber composite materials, carbon fiber composite materials and titanium alloys.

Glued riveting hybrid connection: refers to a test in which carbon fiber composite materials and aluminum plates are first glued and then riveted.

Glue-screw hybrid connection: refers to a test in which carbon fiber composite materials and aluminum plates are first glued and then screwed.

In mechanical connection tests, most composite materials are damaged in the form of nail hole extrusion, plate breakage, delamination and edge shearing. However, in fact, when the latter types of damage do not occur, Crush failure has occurred first. Therefore, the failure criteria of mechanical connections should be based on extrusion damage. The lamination form of carbon fiber composite materials has a relatively large impact on the strength of screw connections, so it must be considered in the design.

The performance of mechanical connection and riveting of carbon fiber composite materials under the same layup form is not as high as that of screw connection. This may be mainly due to the bulging and riveting vibration of the nail-free rod in the screw connection, the nail hole is reamed, the damage around the hole is smaller than that of the drilled hole, and the fit is good. Of course, screwed joints are heavier than riveted joints.

Tests show that the mechanical connection properties of carbon fiber composites are lower than those of aluminum alloys. Therefore, it is necessary to study strengthening measures for the mechanical connection of carbon fiber composite materials. Tests have shown that using titanium sheets for reinforcement can achieve certain results. The connection strength of carbon fiber composites varies greatly with the layup direction. From the perspective of stress level under failure load, carbon fiber composite materials are not as strong as aluminum sheet fabrication screw joints. Comparing the size of the damage load, the mixed connection of rubber screws and rivets is the best; glue connection is second; screw connection is the third; and riveting is the worst. Since fatigue and hot and cold alternating tests have not been carried out, the above test results are only preliminary and limited.

Carbon fiber products have been used in medical equipment, rail transit, automobile industry and other fields. The main advantages are light weight, high strength, high temperature resistance, corrosion resistance, etc. Some carbon fiber products need to be connected. The editor of the Be-cu prototype in this article will give you Introduce the connection method of carbon fiber products.

For components whose thickness, length, and overall volume account for a large proportion of the entire device, mechanical connection is a good choice. Large mechanical equipment will generate a certain amount of vibration and friction during operation. The mechanical connection can transmit a large load, and if the components need to be disassembled and replaced, the mechanical connection is also more convenient.  

The gluing process is suitable for parts with light weight and small volume. Since the glue connection is made of glue, it will not affect the overall weight, but the strength of the glue may be reduced with the change of temperature and environment. , and the glue is not removable. Adhesive connection does not need to open holes in the product, so basically there is no problem of stress concentration.  

China Be-cu Prototype Material Technology Co., Ltd. is a powerful manufacturer of carbon fiber products. It has accumulated rich production experience in the production of carbon fiber products. It has advanced fiber reinforced composite material sheets, pipes, molding, autoclave, CNC machining and other production lines, dedicated to bringing high-quality carbon fiber products to customers.

ISO 9001 certified. BE-CU Prototype Offering CNC machining carbon fiber and other manufacturing services for carbon fiber marterial. Various capabilities include notching, labeling, drilling carbon fiber, grinding, laser cutting carbon fiber, finishing, plating, marking, CNC milling carbon fiber and turning carbon fiber.We stock high quality 3k carbon fiber sheet in a variety of thickness, types and finish. Its a great material used in applications where light weight and strength are needed such as drones. Unlike other workshops, we have no min order and are often filling orders with a single part. We also don’t make you pay for the full sheet and you only get charged for what is used. With a large selection of material, you should find everything you need to make your project come to life. We are also able to handle larger production runs and provide a competitive pricing. If we don’t have the material or finish you require, we are more the willing to look at bringing it in for you.

What Is Carbon Fiber?Carbon fiber is made of polyacrylonitrile (PAN) (or pitch, viscose) and other organic fibers by carbonization (removal of most elements except carbon) by pyrolysis method under inert gas at high temperature above 1,000 °C. Inorganic polymer fibers with a carbon content of more than 90%.