Post Test Composite Materials

What is a composite material?

• A material made from a single constituent material

• A material made from two or more distinct constituent materials

• A material found only in nature

• A synthetic material that cannot be combined with others

Which phase in most composites contains the desirable material properties like high strength or improved ductility?

• Core phase

• Laminate phase

• Dispersed phase

• Matrix phase

What are the two main categories of matrix material in composites?

• Polymer and Glass

• Ceramic and Metal

• Polymer and Ceramic

• Metal and Polymer

What is the most basic form of fiber reinforcement in composites?

• Helical fibers

• Weave patterns

• Unidirectional tape

• Bundled fibers

What is the diameter of a typical fiber used in composites, compared to human hair?

• Same as

• 10 times thinner

• 5 times thicker

• 100 times thinner

What property do fiber-reinforced materials exhibit when fibers are all running in the same direction?

• Heterogeneous

• Anisotropic

• Isotropic

• Homogeneous

What is the term for a laminate that has very similar properties in all of the in-plane directions?

• Isotropic laminate

• Quasi-isotropic laminate

• Homogeneous laminate

• Anisotropic laminate

Which manufacturing method involves winding unidirectional tape that has been impregnated with resin around a mandrel?

• Injection moulding

• Filament winding

• Vacuum bagging

• Wet layup method

What is the main advantage of using fiber-reinforced composites in aerospace?

• High thermal conductivity

• Unbelievable strength-to-weight and stiffness-to-weight ratios

• Resistance to chemical reactions

• High electrical conductivity

What is a significant drawback of fiber-reinforced polymers compared to metals?

• Higher cost

• Lower strength

• Better electrical conductivity

• Higher weight