Fibres & Matricies Flashcards
What are the advantages of glass fibres
Low cost
High tensile strength
Chemically resistant
Electrically/thermally insulating
Radar transparent
What are the disadvantages of glass fibres
What are the disadvantages of glass fibres
Low tensile modulus
High density
Easily abraded
Low fatigue resistance
High hardness
Absorbs water
What are the advantages of carbon fibres
High tensile strength & modulus - weight ratio
Low linear thermal expansion
High fatigue strength
Corrosion and moisture resistant
What are the disadvantages of carbon fibre
Low strain to failure
Low impact resistance
High electrical conductivity
High cost
Which matrices are used with glass fibres
Unsaturated polyesters
Epoxies
Which matrices are used with carbon fibres
Epoxies
What are the advantages of aramid fibres
High tensile strength-weight ratio
Low linear thermal expansion
Good impact resistance and toughness
No sizing required
Good temperature and corrosion resistance
What are the disadvantages of aramid fibres
Hard to process
Low matrix compatibility
Poor in compression
Absorbs moisture
Susceptible to UV radiation
High cost
What are the advantages of UHMWPE
Very high tensile strength-weight ratio
Very low density
Low moisture absorption
High abrasion resistance
High impact resistance
What are the disadvantages of UHMWPE
Low temperature tolerance
Poor matrix compatibility
What is the purpose of the matrix phase
Binding reinforcement
Transfers stress the reinforcement
Protects reinforcement
Adds properties like toughness and shear resistance
Mitigates buckling of reinforcement
What are the advantages of unsaturated polyester matrix
Good mechanical and thermal properties
Easy to cure
Low cost
What are the disadvantages of unsaturated polyester matrix
Thermally unstable
Shrinkage on cure
Volatiles - health concerns
What are the advantages of epoxy matrix
Excellent mechanical and thermal properties
No curing volatiles
Low shrinkage on cure
Excellent chemical resistance
Excellent adhesion to fibres
