Technical principles 3.1.1 Materials and their applications - Classification of materials — AQA A-Level Design and Technology: Product Design
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Technical principles 3.1.1 Materials and their applications - Classification of materials explained
Modern materials are developed through engineering to give properties that traditional materials lack, and they sit alongside smart materials, which respond to a stimulus.
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Learn to recognise them and to name examples. Kevlar is a high-strength aramid fibre used in protective clothing and composites. Precious Metal Clay (PMC) is a mouldable clay of fine metal particles and binder that fires to solid metal, useful for jewellery. Carbon fibre reinforced polymer is a composite, not a modern material, and titanium is a non-ferrous metal, so neither belongs in this group. When classifying, ask what the material is made of and how it behaves: a modern material is engineered for enhanced performance, while a smart material changes a property in response to a stimulus such as heat, light or stress.
Your focus
- Define what makes a material 'modern'.
- Name examples of modern materials and state a use for each.
- Correctly classify materials that are often mistaken for modern materials.
Technical principles 3.1.1 Materials and their applications - Classification of materials exam tips
Marking Points
- Modern materials are engineered to give enhanced properties beyond those of traditional materials.
- Kevlar is a modern high-strength aramid fibre used in protective clothing and composites.
- Precious Metal Clay (PMC) is a modern mouldable material that fires to solid metal.
- Carbon fibre reinforced polymer is classified as a composite, not a modern material.
- Titanium is classified as a non-ferrous metal, not a modern material.
- Smart materials respond to a stimulus, for example shape memory alloy or thermochromic pigment, and are distinguished from modern materials.
Examiner Tips
- 💡Learn two named modern materials with a use each, such as Kevlar in body armour and PMC in jewellery.
- 💡When a distractor names a composite or a metal, check its true family before selecting it.
- 💡Use the stimulus-response test to separate smart materials from modern materials.
Common Mistakes
- Listing carbon fibre as a modern material: correct this by classifying carbon fibre reinforced polymer as a composite.
- Listing titanium as a modern material: correct this by classifying titanium as a non-ferrous metal.
- Confusing modern and smart materials: correct this by reserving smart for materials that change in response to a stimulus and modern for engineered high-performance materials.