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Desired
Fan Properties
· Low weight
- a light/strong structure
·
Impact
resistance - hail stones, birds, rain, debris during take-off, etc..
· Long life under variable aerodynamic
loads - good blade stiffness and damping.
· Corrosion resistance
Materials Selection Issues
· Fan blades are in tensile loading,
and for a light/strong structure, shape independent selection is based
on (E/ρ) and (σy/ρ).
· Titanium
alloys and composite
materials are possible choices based
on these criteria.
·
A
Titanium alloy is the choice for which (E/ρ) = 27 GPa/Mg m-3.
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