FIBER REINFORCED PLASTICS by sairam

FIBER REINFORCED PLASTICS What is a Polymer Composite-FRP FRP: also referred to as a fiber-reinforced polymer is a composite material made of a polymer matrix and some reinforcing materials (eg. Fibers, particles) The reinforcing materials are also referred to as dispersed phase Process definition • A polymer is generally manufactured by • Step-growth polymerization • Addition polymerization. • When combined with various agents to enhance or in any way alter the material properties of polymers the result is referred to as a plastic. Composite plastics refer to those types of plastics that result from bonding two or more homogeneous materials with different material properties to derive a final product with certain desired material and mechanical properties Classification Fiber reinforced Particle reinforced Structural • Fibre reinforced plastics are a category of composite plastics that specifically use fibre materials to mechanically enhance the strength and elasticity of plastics The original plastic material without fibre reinforcement is known as the matrix. The matrix is a tough but relatively weak plastic that is reinforced by stronger stiffer reinforcing filaments or fibres Fiber reinforced Factors affecting Properties of FRP mechanical properties of both the fibre and matrix their volume relative to one another fibre length and orientation within the matrix Commonly used fibres GLASS • Insulating material • to form a very strong and light FRP composite material called glass-reinforced plastic (GRP), popularly known as " fiberglass“ • not as strong or as rigid as carbon fiber, it is much cheaper and significantly less brittle. CARBON • fibers about 5–10 μm in diameter and composed mostly of carbon atoms • carbon atoms are bonded together in crystals that are more or less aligned parallel to the long axis of the fiber • The crystal alignment gives the fiber high strength-to-volume ratio (makes it strong for its size). • high stiffness, high tensile strength, low weight, high chemical resistance, high temperature tolerance and low thermal expansion ARAMID class of heat-resistant and strong synthetic fibers. They are used in aerospace and military applications, for ballistic rated body armor fabric and ballistic composites eg Kevlar , nomex Para-aramid structure [...]... is usually • Epoxy vinyl ester • polyester • thermosetting plastic • phenol formaldehyde resins Silicon fibreglass sheating The reason the fiber was discussed in more detail is because they are what actually differentiate the FRP from its parent polymer Particle reinforced The most important feature is the equidistibution of paticles in all direction The strength of the bonding at matrixparticle interface . material and mechanical properties Classification Fiber reinforced Particle reinforced Structural • Fibre reinforced plastics are a category of composite plastics that specifically use fibre materials. FIBER REINFORCED PLASTICS What is a Polymer Composite-FRP FRP: also referred to as a fiber- reinforced polymer is a composite material made. called glass -reinforced plastic (GRP), popularly known as " fiberglass“ • not as strong or as rigid as carbon fiber, it is much cheaper and significantly less brittle. CARBON • fibers about