Performance characteristics of materials Performance characteristics of papers and boards - Composites — AQA A-Level Design and Technology: Product Design
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Performance characteristics of materials Performance characteristics of papers and boards - Composites explained
Composites combine a reinforcement (such as glass or carbon fibre) with a matrix (such as polyester resin).
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For some uses they are easier to manufacture than traditional materials because the composite can be laid up, moulded or formed into complex, curved, one-piece shapes in a single process, reducing the number of separate parts and joints needed. A glass-fibre-reinforced polyester boat hull, for example, can be moulded as one shell rather than assembling many timber planks. Traditional materials such as timber or steel may need cutting, joining and finishing in several stages. The advantage is use-specific: for simple flat products a traditional material may still be quicker, so 'ease of manufacture' depends on the shape and batch required.
Your focus
- Describe how a composite combines reinforcement and matrix.
- Explain why composites can be easier to manufacture for some uses.
- Compare composites with traditional materials for a given product.
Performance characteristics of materials Performance characteristics of papers and boards - Composites exam tips
Marking Points
- A composite combines a reinforcement with a matrix material.
- Composites can be moulded or laid up into complex one-piece shapes, reducing separate parts and joints.
- This can make manufacture easier than assembling traditional materials such as timber or steel for some uses.
- The advantage depends on the product: for simple forms a traditional material may still be simpler.
Examiner Tips
- 💡Name a specific composite (e.g. glass-fibre-reinforced polyester) and a product to anchor the point.
- 💡Explain the mechanism: fewer parts and joints because the shape is moulded in one piece.
- 💡Qualify the claim with 'for some uses' to match the statement.
Common Mistakes
- Claiming composites are always easier to manufacture: correct this by saying ease depends on the use and shape required.
- Forgetting the two-part structure: correct this by naming both reinforcement and matrix.
- Ignoring that traditional materials may suit simple products better: correct this by noting the comparison is use-specific.