07 Composite Materials Free Online FlashCards

What defines a composite material?

A material made by combining two or more distinct materials that remain identifiable as separate phases.

What is the primary role of reinforcement?

The reinforcement provides much of the composite’s stiffness or strength.

What is the composite interface, and why does it matter?

The interface is the boundary between reinforcement and matrix; its bonding and chemistry affect load transfer, damage, and failure.

What is a lamina?

A lamina is one reinforced layer, often with fibers aligned in a particular direction.

How do unidirectional fibers affect composite properties?

They provide high stiffness and strength mainly along the fiber direction, with much less across it.

What roles can 0° and ±45° laminate layers serve?

A 0° layer supports lengthwise loading, while a ±45° layer can help carry in-plane shear.

How does a sandwich structure achieve bending stiffness?

The separated face sheets provide bending stiffness, while the lightweight core supports them and carries shear.

What does it mean for a composite to be anisotropic?

Anisotropic materials have properties that depend on the direction of the applied load.

Which design choices can tailor composite properties?

Choosing constituents, reinforcement fraction, architecture, and layer orientations can tailor stiffness, strength, and thermal expansion.

Name two factors that can limit composite performance.

Composite parts may be sensitive to impact damage, defects, temperature, moisture, or manufacturing quality.

Where are silicon-carbide composites developed for use?

Silicon-carbide-fiber-reinforced silicon-carbide-matrix composites are developed for gas-turbine hot sections and other demanding thermal environments.

What does the matrix do in a composite?

The matrix surrounds and supports reinforcement, transfers load, and helps protect it from the environment.