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. {'text': 'Carbon (Graphite)', 'label': 'B'}

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

{'text': 'Boron', 'label': 'D'}

Answer

{'text': 'Kevlar', 'label': 'C'}

Answer

{'text': 'Glass', 'label': 'A'}