Functions of fibers and matrix
Fibers
To carry the load
Provide stifness/ strength/thermal stability
Provide electrical conductivity /insulation
Matrix
Binds the fibers together & transfer the load to fiber
Isolates the fibers.(add separately to stop/ slow down crack propagation
Provides a good surface finish quality.
Provides protection to reinforcing fiber against chemical attack & mechanical damage
provides performance characteristics(Ductility, impact strength, toughness)
Failure mode(type of matrix, compatibility with fiber)
Advantages of composites
high performance & light weight
Provides capabilities for part integration(several metallic compound can be replaced by single composite)
In-service or online process monitoring with
the help of embedded sensors (if use)
High specific stiffness (stiffness to density
ratio)
Very high specific strength (strength to
density ratio)
Higher fatigue strength
High corrosion resistance
disadvantages
Very high material cost
The temperature resistance of composite
parts depend on T of matrix.
.
Composites absorb moisture
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Solvent resistance, chemical resistance,environmental stress cracking depend on polymers