Of these common FRP reinforcing fibers — Glass, Carbon, Kevlar (Aramid…

Question

Of these common FRP reinforcing fibers — Glass, Carbon, Kevlar (Aramid), Boron — which has the HIGHEST SPECIFIC STIFFNESS (E/ρ)?

Accepted Answer

C. Carbon (Graphite)

**Carbon fiber:** E ≈ 230-700 GPa, ρ ≈ 1.8 g/cm³
→ highest specific stiffness in common composites.
Glass E ≈ 70 GPa (lower stiffness, denser).
Kevlar excels in toughness, not stiffness.
Boron is stiff but very dense.

Answer

Boron

Answer

Kevlar

Answer

Glass

Of these common FRP reinforcing fibers — Glass, Carbon, Kevlar (Aramid), Boron — which has the HIGHEST SPECIFIC STIFFNESS (E/ρ)?

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