Fabric Weaving Techniques Quiz

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What are resin matrices composed of?

Resin and plastic

Resin and hardener (correct)

Resin and catalyst

Resin and fiber

How are thermoplastic resins formed into desired shapes?

Pressure application

Mechanical stretching

Chemical reaction

Heat manipulation (correct)

What are two types of transparent thermoplastic materials used for aircraft windshields and side windows?

Polyethylene and PVC

Polystyrene and Polypropylene

Cellulose acetate and acrylic (correct)

Polyester and Nylon

Why were early aircraft windshields made of cellulose acetate plastic?

Transparency and light weight Signup and view all the answers

What happens when a thermoplastic is heated a second time?

It forms another shape Signup and view all the answers

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

To enhance strength Signup and view all the answers

What type of fabric is described as having no fill fibres and is occasionally held together by small cross threads?

Unidirectional fabric Signup and view all the answers

In which fabric orientation do the fibres run in two or more directions?

Bidirectional/Multi-directional Signup and view all the answers

Which weave pattern provides good stability, porosity, and the least yarn slippage for a given yarn count?

Plain weave Signup and view all the answers

What type of weave pattern involves the warp floating or skipping over many fill yarns before being woven in?

Satin weave Signup and view all the answers

Which type of fabric is more resistant to fibre breakout, delamination, and damage compared to unidirectional materials?

Unidirectional fabric Signup and view all the answers

How are bidirectional fabrics usually woven with respect to the orientation of warp and weft threads?

With more warp threads than weft threads Signup and view all the answers

Why are fabrics preimpregnated with resin matrix?

To reduce the problems associated with completely wetting the fabric with resin Signup and view all the answers

What advantage do pre-preg materials offer over raw fabrics?

Pre-preg materials contain the proper amount of resin matrix Signup and view all the answers

What problem can occur during hand lay-up when using a resin system with high viscosity?

Difficulty getting the resin into each individual fiber Signup and view all the answers

How do pre-preg fabrics help in producing a stronger component or repair?

By completely encapsulating reinforcing fibers with the matrix Signup and view all the answers

What problem were pre-pregs initially invented to solve for aircraft manufacturers?

To reduce issues related to completely wetting the fabric with resin Signup and view all the answers

Why are pre-preg fabrics considered convenient compared to raw fabrics?

Pre-preg fabrics eliminate the need for weighing and mixing components 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 is the process for mixing the resin and catalyst in pre-packaged materials?

By squeezing and kneading the package Signup and view all the answers

How are mixing-ratio errors eliminated with pre-measured cartridges?

By storing the resin and catalyst separately in the cartridge Signup and view all the answers

What must be done to start using epoxy cartridges?

Break the seal between the two components with a plunger Signup and view all the answers

What is one of the advantages of disposable cartridges for two-component materials?

They store, mix, and apply materials separately Signup and view all the answers

How is the resin dispensed after mixing in pre-packaged materials?

By cutting the package with scissors Signup and view all the answers

How should time-expired two-part epoxy resin systems be disposed of?

By mixing the two components together and disposing of the cured product in accordance with local regulations Signup and view all the answers

What should not be disposed of in general waste bins?

Unmixed, uncured polyester resin/epoxy Signup and view all the answers

How should time-expired polyester resin systems be disposed of?

By mixing them with the appropriate catalyst and then disposing of the cured product in line with local regulations Signup and view all the answers

What is the recommended action for disposal of catalyst-soaked rags?

Do not dispose of them in general waste bins as they could spontaneously combust Signup and view all the answers

Why is it advisable to contact local hazardous-material-collection agencies?

For proper disposal of large quantities of uncured product, accelerators, and catalysts Signup and view all the answers