Aramid Drilling and Carbon Fibre Corrosion Quiz

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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?

To prevent unravelling of the edges Signup and view all the answers

What allows fabrics to be stretched along the bias?

Unidirectional fibers Signup and view all the answers

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

Multidirectional Signup and view all the answers

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

Galvanic corrosion Signup and view all the answers

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

To prevent galvanic corrosion Signup and view all the answers

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

High tensile strength Signup and view all the answers

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

To reduce weight Signup and view all the answers

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

1200°C Signup and view all the answers

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

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

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

Acts as a curing agent Signup and view all the answers

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

Satin weave Signup and view all the answers

What is a characteristic feature of twill weaves?

Distinctive diagonal line Signup and view all the answers

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

To emphasize the use of fibers in the resin matrix systems Signup and view all the answers

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

It will flow to form another shape Signup and view all the answers

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

Twill weave Signup and view all the answers

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

Transfers stress to the fibres Signup and view all the answers

Why were cellulose acetate plastics used in early aircraft windshields?

For their transparency and light weight Signup and view all the answers

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

Polyester resin Signup and view all the answers

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

Trade names like Lucite or Plexiglas Signup and view all the answers

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

Resins alone lack sufficient strength Signup and view all the answers

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

Chemical resistance and heat resistance Signup and view all the answers

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

In separate containers attached at one end Signup and view all the answers

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

Breaking the partition between the containers Signup and view all the answers

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

Squeezing and kneading the package Signup and view all the answers

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

They eliminate mixing-ratio errors Signup and view all the answers

How are epoxy cartridges prepared for use?

Breaking the seal that separates the two components with a plunger Signup and view all the answers

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

A needle or syringe Signup and view all the answers