Conductivity and Thermal Expansion of Metals in Aircraft Structures
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Questions and Answers

What is the correct term for the ability of a metal to expand when heated and shrink when cooled?

  • Fusibility
  • Thermal Conductivity
  • Fusion Joining
  • Coefficient of Expansion (correct)

    • Which alloy is considered a ferrous metal due to containing iron as its chief constituent?

  • Bronze
  • Steel (correct)
  • Aluminum
  • Copper

    • What happens when two or more compatible pieces of metal are melted into one continuous part?

  • Thermal Expansion
  • Fusibility (correct)
  • Coefficient of Expansion
  • Thermal Conductivity

    • Which term describes the process of melting two or more compatible pieces of metal into one continuous part?

    <p>Fusion Joining</p> Signup and view all the answers

    What is the most common ferrous metal in aircraft structures?

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

    Which process involves the ability of a metal to be joined by heating and melting?

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

    What does iron readily combine with to form iron oxide?

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

    Which metal is silvery white in colour and combines readily with oxygen to form rust?

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

    What issue might occur when drilling Aramid material?

    <p>A fibre might get pulled until it breaks</p> Signup and view all the answers

    Why is special corrosion-control techniques needed when carbon is bonded to aluminium or steel?

    <p>Carbon promotes galvanic corrosion</p> Signup and view all the answers

    What type of surfaces should be anodised, primed, and painted when being assembled with carbon material?

    <p>Aluminium surfaces</p> Signup and view all the answers

    Why are carbon-fibre composites used for fabricating primary structural components in aircraft?

    <p>Due to high strength and rigidity</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</p> Signup and view all the answers

    What distinguishes ceramic fibres in terms of temperature applications?

    <p>They retain strength and flexibility at high temperatures</p> Signup and view all the answers

    Why are reinforcements like bulkheads and ribs reduced in large aircraft using carbon-fibre composites?

    <p>Due to the high strength and rigidity of carbon-fibre composites</p> Signup and view all the answers

    What precaution should be taken to prevent galvanic corrosion between carbon materials and aluminium components?

    <p>Place sealants and corrosion barriers at the interfaces</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 taken to mix the resin and catalyst within the pre-packaged mixture?

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

    How is the two-component material dispensed from disposable cartridges?

    <p>By installing a needle or syringe onto the end of the cartridge</p> Signup and view all the answers

    What is done to eliminate mixing-ratio errors with premeasured packages or cartridges?

    <p>Utilizing disposable cartridges</p> Signup and view all the answers

    How should the resin and catalyst mixture be thoroughly blended inside a cartridge?

    <p>Moving the plunger in a twisting and up-and-down motion</p> Signup and view all the answers

    What must be checked before using an epoxy cartridge?

    <p>Cartridge part number, shelf-life expiration date, and special instructions</p> Signup and view all the answers

    What is required to break the seal that separates the two components in an epoxy cartridge?

    <p>A plunger</p> Signup and view all the answers

    How many strokes are typically necessary to thoroughly mix the resin and catalyst in an epoxy cartridge?

    <p>As described on the label of the cartridge</p> Signup and view all the answers

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

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

    In fabric styles for composite construction, what is the defining feature of a unidirectional fabric orientation?

    <p>Major fibers run in one direction</p> Signup and view all the answers

    What happens to the selvage edge before the fabric is utilized?

    <p>It is removed</p> Signup and view all the answers

    Which fiber orientation allows for the manipulation of fabric to create contoured shapes?

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

    What are some styles of fabrics used in composite construction?

    <p>Unidirectional, bidirectional, multidirectional</p> Signup and view all the answers

    Which fabric style gives a fabric its strength predominantly in a single direction?

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

    Why is the weave of the selvage edge different from that of the body of the fabric?

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

    What does the bias fiber orientation allow fabrics to do that is difficult along the warp or fill?

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

    What is a kissing bond in composite structures?

    <p>A disbond between the skin and core that is not visible externally</p> Signup and view all the answers

    Why is disbonding a critical issue in composite structures?

    <p>It affects the integrity of the composite structure</p> Signup and view all the answers

    In what scenarios can cracks be detected visually in composite structures?

    <p>During the final stages of in-service failure</p> Signup and view all the answers

    What is the main consequence of cracking in composite structures?

    <p>Damage extension under service loading</p> Signup and view all the answers

    How do disbands differ from cracks in composite structures?

    <p>Cracks are always visible, while disbands may not be externally visible</p> Signup and view all the answers

    What is one reason why detecting cracks in composites may require more advanced inspection techniques?

    <p>Cracks propagate rapidly making visual detection challenging</p> Signup and view all the answers

    Why is cracking particularly concerning in composite structures when compared to metallic ones?

    <p>Cracking can allow environmental ingress like metallic structures</p> Signup and view all the answers

    What role does end connections play in relation to disbands in composite structures?

    <p>Disbands are particularly important to avoid in end connections</p> Signup and view all the answers

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