40 Questions
What is the correct term for the ability of a metal to expand when heated and shrink when cooled?
Coefficient of Expansion
Which alloy is considered a ferrous metal due to containing iron as its chief constituent?
Steel
What happens when two or more compatible pieces of metal are melted into one continuous part?
Fusibility
Which term describes the process of melting two or more compatible pieces of metal into one continuous part?
Fusion Joining
What is the most common ferrous metal in aircraft structures?
Steel
Which process involves the ability of a metal to be joined by heating and melting?
Fusibility
What does iron readily combine with to form iron oxide?
Oxygen
Which metal is silvery white in colour and combines readily with oxygen to form rust?
Iron
What issue might occur when drilling Aramid material?
A fibre might get pulled until it breaks
Why is special corrosion-control techniques needed when carbon is bonded to aluminium or steel?
Carbon promotes galvanic corrosion
What type of surfaces should be anodised, primed, and painted when being assembled with carbon material?
Aluminium surfaces
Why are carbon-fibre composites used for fabricating primary structural components in aircraft?
Due to high strength and rigidity
How does the compressive strength of carbon fibre compare to Kevlar®?
Carbon fibre is stronger in compressive strength
What distinguishes ceramic fibres in terms of temperature applications?
They retain strength and flexibility at high temperatures
Why are reinforcements like bulkheads and ribs reduced in large aircraft using carbon-fibre composites?
Due to the high strength and rigidity of carbon-fibre composites
What precaution should be taken to prevent galvanic corrosion between carbon materials and aluminium components?
Place sealants and corrosion barriers at the interfaces
How are the resin and catalyst initially stored in pre-packaged materials?
In separate containers attached at one end
What action is taken to mix the resin and catalyst within the pre-packaged mixture?
Squeezing and kneading the package
How is the two-component material dispensed from disposable cartridges?
By installing a needle or syringe onto the end of the cartridge
What is done to eliminate mixing-ratio errors with premeasured packages or cartridges?
Utilizing disposable cartridges
How should the resin and catalyst mixture be thoroughly blended inside a cartridge?
Moving the plunger in a twisting and up-and-down motion
What must be checked before using an epoxy cartridge?
Cartridge part number, shelf-life expiration date, and special instructions
What is required to break the seal that separates the two components in an epoxy cartridge?
A plunger
How many strokes are typically necessary to thoroughly mix the resin and catalyst in an epoxy cartridge?
As described on the label of the cartridge
What is the purpose of the selvage edge in fabric production?
To prevent edges from unravelling
In fabric styles for composite construction, what is the defining feature of a unidirectional fabric orientation?
Major fibers run in one direction
What happens to the selvage edge before the fabric is utilized?
It is removed
Which fiber orientation allows for the manipulation of fabric to create contoured shapes?
Bias
What are some styles of fabrics used in composite construction?
Unidirectional, bidirectional, multidirectional
Which fabric style gives a fabric its strength predominantly in a single direction?
Unidirectional
Why is the weave of the selvage edge different from that of the body of the fabric?
To prevent unraveling of edges
What does the bias fiber orientation allow fabrics to do that is difficult along the warp or fill?
Stretch
What is a kissing bond in composite structures?
A disbond between the skin and core that is not visible externally
Why is disbonding a critical issue in composite structures?
It affects the integrity of the composite structure
In what scenarios can cracks be detected visually in composite structures?
During the final stages of in-service failure
What is the main consequence of cracking in composite structures?
Damage extension under service loading
How do disbands differ from cracks in composite structures?
Cracks are always visible, while disbands may not be externally visible
What is one reason why detecting cracks in composites may require more advanced inspection techniques?
Cracks propagate rapidly making visual detection challenging
Why is cracking particularly concerning in composite structures when compared to metallic ones?
Cracking can allow environmental ingress like metallic structures
What role does end connections play in relation to disbands in composite structures?
Disbands are particularly important to avoid in end connections
Explore the concept of metal conductivity and thermal expansion in the context of aircraft structures. Learn about the predictable nature of thermal expansion and contraction in metals at specific temperatures, and its implications in aviation.
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