6.3.1- Reinforcing Materials Flashcards
Name the common reinforcing fibres in composite. (6 examples)
Nomex Fibreglass Aramid Kevlar Carbon Fibre Graphite.
What material is a DuPont development, is an infusible, wholly aromatic polymer made only as a fibre?
Nomex.
What properties does Nomex have? (3 examples)
1) High thermal stability
2) Temp Resistant
3) Flame Resistant.
What type of clothing is Nomex used in?
Flame proof suits.
Nomex in contrast to its chemical isomer (twin) Kevlar has what property?
Radiation Resistance.
How is Nomex honeycomb made?
Nomex paper sheets and phenolic resin.
What is fibreglass made of?
Strands of molten silica gel then spun together and woven into cloth.
What makes fibreglass so popular? (2 examples)
1) Low cost
2) Wide range of applications.
What are two negative characteristics of fibreglass compared to other fibre materials?
1) weighs more
2) less strength.
Name the two types of fibreglass used in aircraft.
E-glass- electrically resistant
S-glass- High tensile strength.
What is the density of fibreglass?
2.1 g/cm³.
Does fibreglass have high fracture toughness?
Yes.
Does fibreglass have good ‘wet out’?
Yes.
What makes Aramid recognisable?
The fibres are bright yellow.
What company is Aramid the registered trade name to?
DuPont.
What is Aramid an ideal material for?
Parts subject to high stress and vibration e.g. rotor blades. Also used in bullet proof vests.
What is Aramid the shortened name form of?
Aromatic Polyamide.
What is damage to Aramid repaired with?
Fibreglass.
The word aromatic does not refer to the smell in fact it means…
a benzene compound.
What is the density of Aramid?
1.45 g/cm³.
To what temperature is Aramid heat resistant?
260°c.
Kevlar is another development from what company?
DuPont.
What is the description of Kevlar?
Man-made organic fibre with high tensile strength and flexibility.
What are some disadvantages of Kevlar? (3 examples)
1) fibres absorb moisture
2) ‘easily’ compressed
3) difficult to cut- special scissors and drill bits.