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Advanced Material Properties

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Advanced Material Properties

An engineering team is choosing materials for a new offshore wind farm. Use the property guide and test results to make and justify sound choices. Read each question carefully; some ask you to compare evidence.

Material property guide

Tensile strength: resistance to being pulled apart. Spring-back: ability to return to an original shape after bending or stretching. Density: how much mass is packed into a given volume. Thermal conductivity: how readily heat travels through a material. Corrosion resistance: ability to resist chemical damage such as rusting.

Material

Tensile strength

Spring-back

Low density (light)

Corrosion resistance

Carbon-fibre composite

Stainless steel

Aluminium alloy

1.A blade stretches slightly in a gust, then springs back to its original shape when the gust passes. Which property does this demonstrate?

Tensile strength
Elasticity
Thermal conductivity
Corrosion resistance

2.The turbine's electronics produce heat that must be carried away by a heat sink. Which property should the heat-sink material have, and why?

3.The lab rates carbon-fibre composite 5 for tensile strength and stainless steel 5 as well. What does this tell you about their tensile strength in this test?

They received the same highest rating.
Carbon-fibre composite is five times stronger.
Stainless steel has no tensile strength.
The ratings show their exact strength in megapascals.

4.The blades must be strong but as light as possible. Use the lab evidence to select the best candidate from the table and name two ratings that support your choice.

5.A tower component will be exposed to salty sea spray. Which material in the lab has the strongest corrosion-resistance rating, and what is that rating?

6.An engineer suggests using stainless steel for every part because its tensile strength is rated 5. Give one reason from the lab evidence why a different material could be a better choice for the blades.

7.A foundation is made from reinforced concrete and protected steel parts. Concrete is strong under compression and can support heavy loads. Explain why this property is useful for a foundation and one risk that salty water creates for unprotected steel.

8.True or false: A material with high thermal conductivity is usually a good choice for keeping heat inside an insulated roof.

TrueFalse

9.Imagine a turbine blade is made from a brittle material that cracks instead of bending slightly in a powerful gust. Describe one likely consequence and explain how a material that flexes under load and returns to its original shape could help prevent it.

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