Why polymer based materials are replacing metallic materials?

Weight reduction, mainly due to the change in density (more than a 50\% reduction). Metals are heavier than polymers, meaning that their supply, operation, and transportation costs are higher. Lighter products are more ergonomic as well, improving the safety of workers. Lower production costs.

What is composite material in dentistry?

Dental composites, or resin-based composites, are synthetic materials that combine polymeric matrix with a dispersion of glass, mineral, or resin filler particles and/or short fibers by coupling agents. Just like dental amalgam, they are used to restore tooth structure lost through trauma, caries, or other diseases.

Why are composites used instead of metals ceramics or polymers?

Composites have less fracture toughness than metals but more than most polymers. Their high dimensional stability allows them to maintain their shape, whether hot or cold, wet or dry. This makes them a popular material for outdoor structures like wind turbine blades.

What are the major advantages of plastics polymers compared to ceramic glasses and metallic materials?

Plastic fabrication is a faster process compared to metals. Plastics are lightweight and are easy to move around compared to their metal counterparts. Plastics are more resistant to chemical attacks and reactions.

Why is Kevlar used in aircraft?

DuPont™ Kevlar® fiber helps deliver durability, lightweight strength, stiffness, and thermal and fire protection in aircraft composites. The remarkable performance characteristics of Kevlar® can help increase fuel efficiency and decrease operating and maintenance costs.

How are composite materials changing the aviation industry?

For the aviation industry, composites and their high strength-to-weight ratio, said Yang, have been “a game changer,” replacing aluminum and steel as the preferred material used to fabricate the fuselage and wings of passenger airliners—a manufacturing evolution that makes aircraft lighter and more fuel-efficient.