Composites & Non-metalic Flashcards
Define ‘C’ glass fibre
High resistance to corrosive material
Define ‘A’ glass fibre
Standard window glass
Define ‘D’ glass fibre
Improved electrical grade
For radomes
Define ‘E’ glass fibre
Low alkali content
Good resin adhesion
Define ‘R’ glass fibre
American and European glass ‘s’
Define ‘S’ glass fibre
Strength 40% greater than ‘E’ glass
Temp stable 700C
Define filament
A single fibre of glass fibre
Define size
A lub used on the fibres used in manufacture
Define Finish
Compound to improve handling
Define strands
A number of filaments bound together
TEX count
Weight of strands in g/km
Define Roving
Loose combination of strands with no twist
Define yarn
- > Single yarn -> one or more strand with twist 20-40 turns per metre
- > plied yarns -> two or more single yarns with opposite twists.
Define cheese
A roll or spool of roving prior to weaving
Define warp
Longitudinal direction
Define weft
Lateral directions
Define bolt
A roll of cloth
Define SELVEDGE
Edge reinforcement
Aramid fibres properties
- > highest tensile strength & resistance to impact
- > stiffer than glass
- > half as stiff as carbon fibre
- > 40% stronger than glass
- > 20% stronger than carbon
Aramid ident
Yellow tracer every 2” along weft & 6” along warp
Aramid fibres disadvantage
Damaged in ultra violet light
Carbon fibre AKA
Graphite fibres
Carbon groups
- > standard modulus (high strength)
- > intermediate modulus (high stiffness)
- > high modulus
- > ultra high modulus
Define pot life
Usable life of resin whilst in pot
Define category A storage
Blue lebel -> -18c and above
Define category B storage
Yellow label 1c to 5c
Define category C storage
Red label ambient temp
