Aramid Drilling and Carbon Fibre Corrosion Quiz
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Questions and Answers

What is the purpose of the selvage edge in a fabric?

  • To create a diagonal bias
  • To prevent edges from unravelling (correct)
  • To add strength to the fabric
  • To enhance the flexibility of the fabric
  • Which direction does the bias run in relation to the warp threads?

  • Horizontally at a 90° angle
  • Parallel to the warp threads
  • Perpendicular to the warp threads
  • Diagonally at a 45° angle (correct)
  • What is the main characteristic of a unidirectional fabric orientation?

  • Major fibers running in one direction (correct)
  • Major fibers running in both warp and weft directions
  • Major fibers running diagonally
  • Major fibers running in multiple directions
  • Why is the weave of the selvage edge different from the body of the fabric?

    <p>To prevent unravelling of the edges</p> Signup and view all the answers

    What allows fabrics to be stretched along the bias?

    <p>Unidirectional fibers</p> Signup and view all the answers

    In composite construction, which fabric style contains major fibers that run in multiple directions?

    <p>Multidirectional</p> Signup and view all the answers

    What type of corrosion can occur when carbon fibre is bonded to aluminium or steel?

    <p>Galvanic corrosion</p> Signup and view all the answers

    Why do special corrosion-control techniques need to be applied when carbon materials are bonded to aluminium components?

    <p>To prevent galvanic corrosion</p> Signup and view all the answers

    What is the advantage of using carbon-fibre composites in aircraft structural components?

    <p>High tensile strength</p> Signup and view all the answers

    Why are reinforcing bulkheads, ribs, and stringers reduced in number in aircraft designed with carbon-fibre composites?

    <p>To reduce weight</p> Signup and view all the answers

    At what temperature can ceramic fibres retain most of their strength and flexibility?

    <p>1200°C</p> Signup and view all the answers

    How does the compressive strength of carbon fibre compare to Kevlar®?

    <p>Carbon fibre is stronger in compressive strength than Kevlar®.</p> Signup and view all the answers

    What is the function of the catalyst or hardener in resin matrices?

    <p>Acts as a curing agent</p> Signup and view all the answers

    Which weave is known for its smooth surface created by long warp yarn floats?

    <p>Satin weave</p> Signup and view all the answers

    What is a characteristic feature of twill weaves?

    <p>Distinctive diagonal line</p> Signup and view all the answers

    Why do companies sometimes refer to composites as fibre-reinforced plastics?

    <p>To emphasize the use of fibers in the resin matrix systems</p> Signup and view all the answers

    What would happen if a thermoplastic resin is heated a second time?

    <p>It will flow to form another shape</p> Signup and view all the answers

    Which weave pattern repeats on three or more warp and fill yarns?

    <p>Twill weave</p> Signup and view all the answers

    What is the primary function of the matrix in a composite material?

    <p>Transfers stress to the fibres</p> Signup and view all the answers

    Why were cellulose acetate plastics used in early aircraft windshields?

    <p>For their transparency and light weight</p> Signup and view all the answers

    Which matrix material is known for being used with fibreglass in early non-structural applications?

    <p>Polyester resin</p> Signup and view all the answers

    What is a distinguishing feature of acrylic plastics used for aircraft windows?

    <p>Trade names like Lucite or Plexiglas</p> Signup and view all the answers

    Why do resin matrices need to be reinforced with other materials for structural applications?

    <p>Resins alone lack sufficient strength</p> Signup and view all the answers

    What characteristics have been improved in newer matrix materials compared to older ones?

    <p>Chemical resistance and heat resistance</p> Signup and view all the answers

    How are the resin and catalyst initially stored in pre-packaged materials?

    <p>In separate containers attached at one end</p> Signup and view all the answers

    What action is required to allow the resin and catalyst to mix in pre-packaged materials?

    <p>Breaking the partition between the containers</p> Signup and view all the answers

    How is the resin/catalyst mixture blended together in pre-packaged materials?

    <p>Squeezing and kneading the package</p> Signup and view all the answers

    What is a key advantage of using disposable cartridges for two-component materials?

    <p>They eliminate mixing-ratio errors</p> Signup and view all the answers

    How are epoxy cartridges prepared for use?

    <p>Breaking the seal that separates the two components with a plunger</p> Signup and view all the answers

    What additional item may be attached to an epoxy cartridge after mixing is complete?

    <p>A needle or syringe</p> Signup and view all the answers

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