Smart Materials, Composites and Technical Textiles
Three families of advanced material - one that reacts, one that combines, one that is woven for a job. Learn what sets each apart, because mixing them up is where the marks are lost.
Learn it by doing, the way you will be assessed
Free and interactive, so you can rehearse the thinking away from the workshop or studio.
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Materials with a trick up their sleeve
Modern products use materials that do more than just sit there. Some change on demand, some are stronger combined than alone, and some are woven for one exact job. They fall into three families - smart materials, composites and technical textiles - and the single most common exam mistake is mixing them up. This tour keeps them firmly apart, because telling them apart is exactly what the marks are for.
Three families, three definitions
Learn these five now. Everything else in the module is a test of whether you can keep the first three apart.
Spot the smart definition
What makes a material a SMART material?
- It makes a reversible change in response to a stimulus like heat, light or pressure
- It is any material that has been invented recently
- It is made by combining two or more materials
- It is a fabric designed for a technical job
Match each smart material to what it does
- Shape-memory alloy (Nitinol)
- Thermochromic pigment
- Photochromic lens
- Piezoelectric material
- Returns to a remembered shape when heated
- Changes colour as its temperature changes
- Darkens in bright light and clears in the shade
- Produces a small voltage when it is pressed
The line that trips people up
Here is the distinction the examiner is testing. A smart material must make a reversible, stimulus-triggered change - take the heat or light away and it goes back. A composite responds to nothing; it is simply a combination of materials chosen for better strength or lower weight. And "modern" on its own means nothing - a material is not smart just because it is new. Keep these three ideas separate and the marks are yours.
Which are actually smart?
Select the THREE materials that are SMART materials - they make a reversible change when a stimulus is applied.
- Shape-memory alloy
- Thermochromic pigment
- Photochromic glass
- Plywood
- Carbon-fibre reinforced polymer
Stronger together: composites
A composite combines materials so the mixture beats either one alone - usually much stronger, or much lighter. It does not react to anything; the cleverness is in the combination.
Match each composite to a use
- Reinforced concrete
- Plywood
- GRP (fibreglass)
- Carbon-fibre reinforced polymer
- Bridges and building frames
- Furniture and flooring
- Boat hulls and water tanks
- Racing-bike frames and aircraft parts
Spot the composite definition
What makes a material a COMPOSITE?
- Two or more materials are combined to give better properties than either alone
- It reverses its shape when it is heated
- It is a fabric engineered for a specific function
- It is a single, pure metal
Fabrics with a job to do
Technical textiles are not about looks - they are engineered for a function. The name usually tells you the job: Geo-textiles stabilise soil under roads and railways; agro-textiles protect crops; construction textiles reinforce buildings; protective textiles like Kevlar stop bullets and flames; sports textiles wick sweat away; and environmentally friendly textiles break down safely - Biopol is a well-known trademarked biodegradable polymer. Same idea every time: a fabric built for a purpose.
Name the textile
Technical textiles are fabrics engineered for a _____ rather than for fashion. A _____ textile stabilises the soil beneath a new road, a _____ textile such as Kevlar is used for body armour, and _____ textiles wick sweat away during exercise. Biopol is an example of a _____ polymer.
Pick the right material
Three design problems, one from each family. Choose the material that fits - and do not let the others tempt you.
- A designer wants spectacle lenses that darken automatically in sunshine and clear again indoors.
- An engineer needs a racing-bike frame that is very strong but extremely light.
- A civil engineer needs to stop soil washing away beneath a new road.
Three material families
Advanced materials fall into three families. A smart material makes a _____ change in response to a stimulus such as heat or light. A composite _____ two or more materials to get better properties than either alone. A technical textile is a fabric built for a _____. The exam trap is mixing these up: only a smart material gives a stimulus-triggered response, and only a composite is a true _____ of materials.
Choose the racing wheelchair material
A designer is choosing materials for a new racing wheelchair. Explain why a composite such as carbon-fibre reinforced polymer suits the frame, and suggest one smart material or technical textile that could improve the design, giving a reason.
- Say what a composite is, and name the property that suits a racing frame
- Explain why carbon-fibre reinforced polymer is chosen over a single material
- Name one smart material OR technical textile that could improve the wheelchair
- Give a clear reason linked to how that material behaves or performs