Fiber-Reinforced Composites Worksheet

Front

What is the typical function of the matrix in a fiber-reinforced composite?

Back

Bind and transfer stress to fibers

Front

Which property is most improved by using high-modulus carbon fibers? Options: Fracture toughness, Stiffness, Density, Damping ratio

Back

Stiffness

Front

Which manufacturing method is most common for making aerospace-grade prepregs? Options: Hand lay-up, Resin infusion, Hot-melt impregnation, Injection molding

Back

Hot-melt impregnation

Front

The "critical fiber length" in short-fiber composites depends on: Fiber modulus, Matrix viscosity, Interfacial shear strength, Fiber orientation angle

Back

Interfacial shear strength

Front

Which reinforcement offers highest toughness? Options: E-glass, Aramid (Kevlar), Carbon, Basalt

Back

Aramid (Kevlar)

Front

What type of failure does the “double cantilever beam” test evaluate?

Back

Delamination (Mode I)

Front

The stiffness of a composite increases with: Decreased fiber aspect ratio, Decreased matrix viscosity, Increased fiber volume fraction, Increased cure time

Back

Increased fiber volume fraction

Front

Which fiber orientation provides isotropic in-plane properties? Options: 0°, 90°, ±45°, Quasi-isotropic layup

Back

Quasi-isotropic layup

Front

Which of the following is a thermoset resin commonly used in composites? Nylon, Epoxy, ABS, Polycarbonate

Back

Epoxy

Front

Voids in composite laminates mostly affect: Color, Density, Interlaminar strength, Fiber stiffness

Back

Interlaminar strength