Composites (4.2f)

What is the definition of a composite?

• Composites are when you weld two or more metals together to form a new type of metal.

• Composites are a combination of two or more materials that are bonded together to improve their mechanical or physical properties.

• Composites are when you take 2 or more metals and fuse them through melting.

• Composites are when you take 2 or more matrix and mix them to create a new material.

Laminated glass is often used to make...

• Greenhouses

• Windows in high-rise buildings

• Windows in residential buildings

• Vehicle windshields

True or False - Particle re-enforcing in composites is a less effective means of strengthening than fibre reinforcement

• True

• False

What is a matrix?

• A material used to bond composite materials

• A type of carbon fiber

• A type of concrete used in the building industry

• A type of laminated wood to make cheap furniture

What is the matrix used to join carbon fibers?

• PVA

• Epoxy resin

• Cyanoacrylate

• Urea formaldehyde

What are cermets a composite of?

• Carbon fiber and epoxy resin

• Carbon fiber and polyester

• Ceramic and metals

• Cement, sand and aggregate

Which composite would be most suitable to manufacture turbine blades in a jet engine?

• Kevlar

• Fiberglass (GRP)

• Carbon fiber

• Cermet

What are the properties of Kevlar?

• Heavy, incredible strength, low cost

• Flexible, elastic, ductile

• Waterproof, rigid, low cost

• Vibration absorption, incredible strength, abrasion resistance

What does GRP stand for?

• Glass rigid plastic

• Glued rigid polymer

• Glass reinforced polymer

• Glass reinforced plastic

Plywood has the following properties...

• Resistance to cracking, breaking, shrinking, twisting and warping

• Resistance to insects, moisture, mould

• Good weight strength ratio, comes in wider board sizes than solid wood, more economical than using expensive solid wood

• Heavy and relatively weak, easy to cut and join