Maya Ellison
Composites are materials made by combining two or more natural or artificial elements to create a new and superior material. They are typically designed with a particular use in mind, such as added strength, efficiency, or durability. Composites are not the same as plastics, but they can be made of plastic. Polymer resins, for example, are sometimes referred to as plastics and are commonly used in composites. Composites can be lighter, stronger, and more durable than common materials, which makes them ideal for a variety of applications, from construction and military equipment to turbine blades.
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What You'll Learn
Composites are a combination of components
Composites are materials made by combining two or more distinct components to create a new, superior material. In other words, composites are a combination of components. The individual components of a composite work together to create a material that is stronger than its individual parts.
A common type of composite is fibre-reinforced plastic (FRP), which combines a fibre and a resin to make a matrix. The fibre provides structure and strength, while the resin (a type of plastic polymer) holds the fibre together. For example, fibreglass is a type of FRP composite made by embedding small glass fibres within a polymeric material, usually an epoxy or polyester. Other common types of FRP composites include carbon-fibre-reinforced polymers and aramid fibre-reinforced polymers.
Another example of a composite is plywood, which is a man-made material that combines natural and synthetic components. Plywood is made by bonding thin layers of wood veneer with adhesive to create laminated wood that is stronger than natural wood.
While some plastics are composites, not all plastics are composites. Most everyday plastics, such as those used in toys and water bottles, are not composites. However, some plastics, such as polyester and vinyl, are derived from petroleum-based composites.
Polymer and plastic composites are a type of composite that combines plastics with fibres, fillers, particulates, or other matrix reinforcements to improve their strength and stiffness. These composites are often used in electrical and electronics applications to provide protection against electrostatic discharge and electromagnetic interference. They can also be designed to provide enhanced thermal characteristics.
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Composites are lighter, stronger and more durable
Composites are not another word for plastics. A composite is a material made by combining two or more distinct materials, resulting in a combination of their properties. Composites are made up of a binding agent, or matrix, and a filler material, which gives the composite substance.
One of the most common composites is fibreglass, which is made up of small glass fibres embedded within a polymeric material, usually an epoxy or polyester. The glass fibre provides stiffness and strength, while the polymer adds ductility and flexibility. This combination of materials results in a composite that is stiffer, stronger, more flexible, and more ductile than either of the original materials.
The use of composites is particularly advantageous when seeking to create a product that is both strong and lightweight. For example, carbon-epoxy composites are now the baseline materials in aerospace and sporting goods. The composite airframes used by Boeing are lighter than conventional airframes, which has a positive impact on operating efficiency and performance. They also do not corrode and resist the fatigue that eventually weakens and cracks metal structures. Carbon fibre is also used in the automotive industry, where its high strength and low weight improve speed and engine efficiency.
The strength and lightweight nature of composites are also beneficial in military applications. In 2007, an all-composite military Humvee was introduced, which was lighter and allowed for higher payloads. Carbon fibre and DuPont Kevlar, which is five times stronger than steel, were combined with enhanced thermoset resins to create military transit cases that were 30% lighter with high strength.
The use of composites is also becoming more common in the field of medicine, particularly in orthopedic surgery. Additionally, composite materials are being used in renewable energy systems, where their high thermal conductivities and low coefficients of thermal expansion are advantageous.
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Composites resist corrosion and are flexible
Composites are not another word for plastics. Composites are materials made up of a binding agent and a filler material. Reinforced plastics, such as fibreglass, are an example of a composite.
Corrosion-resistant composites are a vital part of many industries, including maritime and businesses that transport chemicals and materials. Composites like carbon fibres, glass fibres, and rapid cure resins contain properties that resist corrosion from moisture and oxygen. They can protect steel in humid environments, as well as from saltwater and corrosive chemicals.
The use of corrosion-resistant composites can save businesses money in the long term. The cost of repairing and replacing rusted steel is much higher than protecting it from damage with composites. Corrosion-resistant composites also increase the longevity of products, making them more reliable.
Composites are also flexible in their use across various industries. Composite materials can be less expensive, lighter, stronger, or more durable than common materials. They can be used in construction and technical structures such as boat hulls, swimming pool panels, racing car bodies, storage tanks, and more.
Additionally, advancements in technology have allowed for the development of highly toughened composites with improved impact resistance. For example, interleaving stiff and brittle epoxy-based carbon-fibre-reinforced polymer laminates with flexible thermoplastic laminates can result in composites with improved toughness and impact resistance.
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Composites are used in construction and technical structures
Composites, or composite materials, are used in construction and technical structures due to their advantageous properties, such as high strength, low weight, flexibility in design, and durability.
In construction, composites are used to build bridges, exterior cladding, window components, storage units, and even entire buildings. They are also employed to reinforce concrete structures, particularly with fibre-reinforced polymer (FRP) rebar, which offers superior anti-corrosive properties compared to steel rebar. The use of composites in concrete structures helps prevent issues like cracking, moisture invasion, corrosion, and spalling caused by temperature-induced contraction and expansion. Additionally, composites are utilised to repair and rehabilitate existing structures, including bridge beams, parking garages, and pipelines, providing a more cost-effective solution than new construction.
The flexibility of composite materials allows them to be moulded into various shapes, making them suitable for both structural and decorative purposes. This flexibility also enables the replacement of complex assemblies made of other materials, such as wood, steel, or aluminium, with single parts made of composites. Composite materials are also valued for their lightweighting benefits, which contribute to easier transportation and installation, reducing the environmental impact of construction projects.
Composite materials are used in a variety of technical structures, including boat hulls, swimming pool panels, racing car bodies, shower stalls, bathtubs, storage tanks, and cultured marble countertops. They are also increasingly used in automotive applications, such as in the Nokia 6.2 and Nokia 7.2 phone frames, which are claimed to utilise polymer composites. Composite materials' high specific strength, corrosion resistance, and water resistance make them ideal for these applications.
Furthermore, composites are employed in the fabrication of wind turbine wings, high-pressure gas cylinders for firefighting, and military transit cases. The specific type of composite used depends on the application, with various options available, such as carbon-fibre composites, glass-reinforced plastics, and shape-memory polymer composites, which can be repeatedly heated and reshaped without losing their material properties.
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Composites are used in military vehicles and body armour
Composites are materials made up of a binding agent and a filler material. Reinforced plastics, such as fibreglass and fibre-reinforced polymers, are examples of composites. Fibre-reinforced polymers include carbon-fibre-reinforced polymers and glass-reinforced plastic.
Composite armour is a type of vehicle armour consisting of layers of different materials such as metals, plastics, ceramics or air. Composite armour is used in military vehicles to protect against high-explosive anti-tank (HEAT) projectiles, which were first introduced in World War II. HEAT projectiles are lightweight and small but can penetrate hundreds of millimetres of steel armour. Composite armour can be designed to be stronger, lighter and less voluminous than traditional armour, but the cost is often prohibitive.
All modern third-generation main battle tanks use composite armour arrays in their construction. Some tanks, such as the Japanese Type 10 and Type 90 Kyū-maru MBTs, use a modular composite armour design, where sections of the armour can be easily upgraded or replaced. Composite armour has also been applied to smaller vehicles, such as jeeps.
In addition to vehicle armour, composites are also used in military body armour. For example, in 2008, carbon fibre and DuPont Kevlar were combined with enhanced thermoset resins to create military transit cases that were 30% lighter but maintained high strength.
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Frequently asked questions
No, composites are not another word for plastics. Composites are materials made from two or more different materials that, when combined, are stronger than those individual materials by themselves. Composites are also known as Fiber-Reinforced Polymer (FRP) composites. Polymer resins are sometimes referred to as plastics.
Composites are made from a combination of natural or artificial elements with different physical or chemical properties. Common types of fibers used in FRP composites include fiberglass, carbon fiber, and aramid fiber.
Some examples of composite materials include concrete, reinforced plastics, ceramic matrix composites, and wood.
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