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ENGINEERING, AE 2023 HSC 25a

Describe the process of compression moulding when used to manufacture aircraft components.   (3 marks)

 

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  • The process of compression moulding of aircraft components requires a polymer to be fed into an open, heated mould cavity.
  • Once the polymer is soft, the mould is then closed and compressed.
  • Compression allows the material to fill the mould entirely. The charge cures within the heated mould.
  • When the piece is cured it is removed and the mould can be reused.

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  • The process of compression moulding of aircraft components requires a polymer to be fed into an open, heated mould cavity.
  • Once the polymer is soft, the mould is then closed and compressed.
  • Compression allows the material to fill the mould entirely. The charge cures within the heated mould.
  • When the piece is cured it is removed and the mould can be reused.
♦ Mean mark 50%.

ENGINEERING, AE 2023 HSC 21d

Draw, label and describe the microstructure of a thermosetting polymer.   (3 marks)
 

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  • Thermosetting polymers have a three-dimensional network structure, where polymer chains are cross-linked by covalent bonds in a network of polymer chains.
     

♦♦ Mean mark 36%.

ENGINEERING, PPT 2018 HSC 26d

The components of the bearing assembly used in the fidget spinner are shown.
 

The retainer can be made from either glass fibre-reinforced nylon or stainless steel.

Compare the in-service properties of these materials for use in the retainer.   (4 marks)

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ENGINEERING, AE 2019 HSC 25b

Some materials have properties that allow them to be used in the manufacture of both modern racing yachts and aircraft. These materials include Kevlar® aramid fibre, carbon fibre epoxy composites and aluminium alloys.

Complete the table by providing a property which makes each of these materials suitable for the manufacture of both yachts and aircraft.   (3 marks)
 

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Include one of the properties in the second column:

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Include one of the properties in the second column: