Materials, Properties and Design

Table of Contents




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.