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MECHANICS OF FIBER REINFORCEMENT COMPOSITES

Introduction:

We know metals have more strength and toughness but they are more

corrosive and weight is also more that is they are denser. While in case of

ceramics and polymer they are lighter in weight and anticorrosive but when we

want more toughness ceramics lack behind. Now a day for some application we

required a material which is light in weight having more strength and toughness

with anti corrosiveness property. Fiber reinforcement composite is best solution

of our requirement which is a material in which a homogeneous matrix

component is reinforced by a stronger and stiffer constituent that is usually

fibrous in shape. Compressive strength of matrix and tensile strength of fiber

makes it stronger. Fibers are strong due to removal of flaws in the case of

ceramics and molecular alignment foe polymer.

Fiber reinforcement composite mainly used where individual material

cannot meet specific requirement.

M1= material of matrix

M2= material of fiber

C1= fiber reinforcement composite

M1 + M2 = C1

(Light weight and anticorrosive) (High strength and tough) (Light weight, anticorrosive

High strength and tough)

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Function of fiber is to carry load along the longitudinal axis direction commonfiber reinforcement materials are

Aluminum, Asbestos, Carbon (graphite), Glass, Steel, Titanium,

Tungsten, Quartz, Polyamide (aromatic polyamide, Aramid )

example: kelvar49

Function of matrix is to transfer of stresses between the reinforcing the fibersand protect them from mechanical damages material for matrix are as follows

Resin matrix:

Epoxy, Phenolic, Polyester, Polyurethane, Vinyl ester

Metal matrix:

Aluminum, Copper, Lead, Magnesium, Silver

Matrix

Fibers

Fig. Fiber reinforcement composites

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APPLICATIONS:

fiber reinforcement composite have a wide range of applications like in

aerospace engineering, boat construction, in buildings, bridges etc.

Fiber reinforcement composites in industry

1. Automotive: Automotive industry adopted composites slowly as the cost offiber reinforcement composites is much higher. Generally fiber

reinforcement composites are used in sport car mostly carbon

reinforcement composites are used. Recently in BMWi3 and i8 car carbon

reinforcement composites are used.

2. For wind power turbine blade: because of some properties of fiberreinforcement composites like light weight, high strength and stiffness,

anti-vibration, anticorrosive and weather resistance it is used in making of

wind power turbine blade.

3. Marine: fiber reinforcement composites are used in boat structure. As glassfibers gives more uniform properties these are used in large structure. Use

of carbon fiber is more expensive as compare to the glass fibers.

4. Aerospace: Carbon reinforcement composites are now common in militaryand aviation. The Boeing 787 and airbus A350XWB have roughly 50% of

structure is of composite. Carbon fiber materials are also used in helicopter

system, rocket motors satellite system and turbine engine.

5. Miscellaneous applications: For making tennis rackets fiber reinforcement composites are used

as they provide light weight and stiffness.

These are also used in dental application. Used in furniture etc.