What is Carbon Fiber Honeycomb Sandwich Panels?

Carbon fiber Honeycomb Panel is made of carbon fiber and different core like nomex, PVC, pp, glassfiber and so on, it has high fatigue resistance and anti chemical corrosion ability, the excellent dielectric and radar conductive property as well.

We also need to know what is honeycomb panel.Honeycomb means beehive. By laying out hexagons like a beehive, it is possible to achieve "maximum strength with minimum material," so a honeycomb structure is mechanically ideal.Honeycomb panels are ultra-lightweight, high-strength panels with a honeycomb core sandwiched between face plates, the majority of the volume is air. These panels can be tapped, drilled, notched, or otherwise processed and treated in the same way as ordinary metal materials.Honeycomb panels are used when a significant weight reduction is desired without compromising strength.

General speaking,honeycomb panel is made from aluminum, paper, and plastic, honeycomb panels are selected for different applications because their strength and weight vary depending on the coarseness of the honeycomb core. Aramid fiber composites and carbon fiber composites are used in the aerospace field, while aluminum is generally used for building materials, medical equipment, and furniture.In addition, honeycomb cores have the effect of regulating turbulent air flow (rectifying action) and can be used as rectifying plates for showcases and the like. It is also applied in various ways to muffle sound and insulate heat.

The construction of Carbon Fiber Honeycomb Sandwich Panels

Sandwich Material Construction
There are three components to any sandwich material; the facing, the core and the glue that holds it all together. Each of these will affect the material weight, strength and its performance characteristics. Generally, the faces are extremely strong and the core is lightweight and very much weaker, but with the use of an excellent adhesive, the benefits of both can be realised.

Composite Panel Facing materials
Facing materials vary enormously. They can be purely functional or they can be purely cosmetic. Most are a combination. Facing materials are either composite or non-composite. Non-composites, i.e. timber veneers, metallic sheets, plastic sheets, melamine etc are manufactured first and then incorporated into the sandwich. Composite facings can be laminated directly onto the core material, reducing manufacturing time and finished composite panel weight, or they can be premanufactured but many are only finally cured during the sandwich finishing process.

The Core
The second part of the sandwich is the core. The core of the material performs two principal functions; it keeps the sandwich faces the correct distance apart during bending or compressive loading and it stops them from sliding over one another due to sheer loads. For this, core materials need to have suitable strength and stiffness qualities.

Apart from the aerospace industry, which generally uses honeycomb or corrugated materials, the most commonly used core materials for sandwich construction are expanded thermoset and thermoplastic foams. These foams can be closed-cell foams, open-cell foams or a mixture of closed and open-cell foams. Almost any polymer can be foamed, but the most frequently used in sandwich structures are polyurethanes (PUR), polystyrenes (PS), polyvinylchloride (PVC), polymethacrylimides (PMI), polyetherimides (PEI) and polyphenolics (PF). Some can be performed to complex shapes before they are faced and some, such as polyurethanes (PUR), can be foamed between the pre-constructed faces of the sandwich allowing even more complex shapes to be made in these materials.

The features of Carbon Fiber Honeycomb Sandwich Panels

1. High Rigidity

The structure of a honeycomb panel can be thought of as a collection of hexagonally arranged I-shaped beams, making the entire panel resistant to deformation. The honeycomb-supported surfaces achieve high out-of-plane stiffness, allowing for higher loads.

2. Fatigue Properties

Compared to welded or mechanically bonded plate structures, there is no stress concentration, resulting in superior fatigue properties. It also has superior acoustic fatigue due to honeycombing.

3. Surface Smoothness

No distortion that occurs when bolting or riveting, and a smooth, flat surface can be obtained during molding and assembly, resulting in a beautiful appearance.

4. Shock Absorption

When subjected to load in the direction of thickness, honeycomb buckles while maintaining an almost constant load, which is the reason for its high shock-absorbing property.

5. Heat Insulation

More than 90% of the air volume is contained within each independent cell, preventing air convection.

6. Sound Deadening Properties

When a small hole is made on one side of the board, acoustic energy resonates in the air inside to produce a muffling effect. The frequency at which the sound is muffled depends on the cell size of the honeycomb and the thickness of the panel.

Specification of Carbon Fiber Honeycomb Sandwich Panels