Active learning ideas
Engineering does not happen in a vacuum; every material used has a history and an environmental footprint. This topic explores the lifecycle of materials, from the extraction of ores and the drilling for oil to the energy-intensive processes of refining and manufacturing. Students examine the global supply chain and the specific environmental challenges associated with mining and plastic production.
Activity 01
Groups trace the lifecycle of an aluminum can: bauxite mining, smelting, manufacturing, use, and recycling. They create a visual map showing the energy used and the waste produced at each stage.
Where do raw engineering materials come from?
Activity 02
Students take on roles as mining engineers, environmental activists, and local residents. They debate the opening of a hypothetical new mine in Ireland, balancing economic benefits with environmental protection.
What is the environmental cost of extracting metals and plastics?
Activity 03
Students look at a common workshop project and brainstorm three ways to reduce material waste during its manufacture, such as better 'nesting' of parts on a sheet of metal.
How can engineers reduce material waste?
A few notes on teaching this unit
Watch Out for These Misconceptions
Recycling a material uses no energy.
While recycling often uses significantly less energy than primary extraction (especially for aluminum), it still requires energy for transport and reprocessing. Lifecycle analysis helps students understand the 'net' benefit.
Plastics are always the 'worst' environmental choice.
In some cases, lightweight plastics can reduce transport emissions more than heavier alternatives. Students need to look at the 'total impact' rather than making assumptions based on material type alone.
Methods used in this brief
Introduction to Materials
Classify basic engineering materials including metals, polymers, and smart materials used in modern manufacturing.
8 methodologies
Sustainability and the Circular Economy
Explore sustainable engineering practices and how the circular economy model can be applied to product design.
8 methodologies