Composite Materials Quiz

What is a composite material?

• A material system composed of two or more physically distinct phases

• A material system composed of only one phase

• A material system composed of three or more physically distinct phases

• A material system composed of four or more physically distinct phases

What are the functions of the matrix in reinforced plastics?

• Support the fibers in place and protect the fibers against physical damage and the environment

• Support the fibers in place and enhance the color of the fibers

• Protect the fibers against physical damage and enhance the color of the fibers

• Support the fibers in place and protect the fibers against chemical damage

What is an example of a metal matrix composite (MMC)?

• Composite Military Helmets and Body Armor

• Graphite Fiber

• Aluminum-matrix Composite Brake Calipers

• Glass Fibers

What type of fibers are the least expensive of all fibers?

• Glass Fibers

• Carbon Fiber

• Ceramic Fiber

• Graphite Fiber

What is the benefit of laminar composite?

• Low density, honeycomb core

• High tensile strength

• Small weight, large bending stiffness

• Balanced, in-plane stiffness

What does the rule of mixture represent in composite calculation?

• Volume fraction of the reinforcing material

• Physical properties of the reinforcing material

• Length of the fibers

• Type of the reinforcing material

What is the elastic modulus of the graphite–epoxy reinforced plastic composite with 20% graphite fibers?

• 140 GPa

• 120 GPa

• 160 GPa

• 180 GPa

What is the purpose of the matrix in composite materials?

• Support the fibers and enhance the color of the fibers

• Protect the fibers against chemical damage and enhance the color of the fibers

• Support the fibers and protect the fibers against physical damage and the environment

• Support the fibers and protect the fibers against chemical damage

What is the elastic modulus of the carbon–epoxy reinforced plastic composite with 30% carbon fibers?

• 160 GPa

• 180 GPa

• 200 GPa

• 140 GPa

Which type of composite material is composed of two or more physically distinct phases?

• A material system composed of only one phase

• A material system composed of three or more physically distinct phases

• A material system composed of four or more physically distinct phases

• A material system composed of two or more physically distinct phases