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The common core material types and characteristics in the composite sandwich structure

May 12, 2020

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Adhesive sandwich structure has been used in the field of composite materials for more than half a century, and has been a basic component of the composite material industry. The idea of using relatively thin, strong panels bonded to thicker, lightweight core materials has enabled the industry to build strong, strong, lightweight, and highly durable structures. This technology has been proven in ships, trucks, cars, wind turbine blades and building structures. If the core layer and the surface layer are correctly selected, a 3% increase in weight can increase the bending strength and stiffness by 3.5 times and 7 times, respectively.

The panel can be almost any material. In the composites industry, the most common panels are glass fiber and carbon fiber panels. There are many types of core materials to choose from, with a wide range of performance and cost:

Balsa

Balsa has a high aspect ratio and oriented unit cells so that the grains are oriented in the direction of maximum stress. Light wood has a good record in recreational ship hulls, military aircraft, naval ships, vehicles, wind turbine blades, and corrosion-resistant industrial tanks.

The closed-cell structure of telomere balsa consists of elongated prismatic pores with a length (grain direction) of approximately 16 times the diameter. The density of this material is usually between 6 and 16 pounds per cubic foot, so it has excellent stiffness and bond strength. The telomere balsa has a flat form, which can be used in a flat structure or a block arrangement supported by tulle to accommodate complex curves.

Cross-linked PVC foam

Polyvinyl chloride (PVC) foam cores are made by combining polyethylene-based copolymers with stabilizers, plasticizers, crosslinking compounds, and blowing agents. The mixture is heated under pressure to initiate the cross-linking reaction, and then immersed in a hot water tank to expand to the desired density. PVC foam combines strength and weight well, with a density range of 4 to 30 lb / ft?

Source : http://www.up-resin.com/


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