29 Questions
What are resin matrices composed of?
Resin and hardener
How are thermoplastic resins formed into desired shapes?
Heat manipulation
What are two types of transparent thermoplastic materials used for aircraft windshields and side windows?
Cellulose acetate and acrylic
Why were early aircraft windshields made of cellulose acetate plastic?
Transparency and light weight
What happens when a thermoplastic is heated a second time?
It forms another shape
Why do resin matrix systems need to be reinforced with other materials for structural applications?
To enhance strength
What type of fabric is described as having no fill fibres and is occasionally held together by small cross threads?
Unidirectional fabric
In which fabric orientation do the fibres run in two or more directions?
Bidirectional/Multi-directional
Which weave pattern provides good stability, porosity, and the least yarn slippage for a given yarn count?
Plain weave
What type of weave pattern involves the warp floating or skipping over many fill yarns before being woven in?
Satin weave
Which type of fabric is more resistant to fibre breakout, delamination, and damage compared to unidirectional materials?
Unidirectional fabric
How are bidirectional fabrics usually woven with respect to the orientation of warp and weft threads?
With more warp threads than weft threads
Why are fabrics preimpregnated with resin matrix?
To reduce the problems associated with completely wetting the fabric with resin
What advantage do pre-preg materials offer over raw fabrics?
Pre-preg materials contain the proper amount of resin matrix
What problem can occur during hand lay-up when using a resin system with high viscosity?
Difficulty getting the resin into each individual fiber
How do pre-preg fabrics help in producing a stronger component or repair?
By completely encapsulating reinforcing fibers with the matrix
What problem were pre-pregs initially invented to solve for aircraft manufacturers?
To reduce issues related to completely wetting the fabric with resin
Why are pre-preg fabrics considered convenient compared to raw fabrics?
Pre-preg fabrics eliminate the need for weighing and mixing components
How are the resin and catalyst initially stored in pre-packaged materials?
In separate containers attached at one end
What is the process for mixing the resin and catalyst in pre-packaged materials?
By squeezing and kneading the package
How are mixing-ratio errors eliminated with pre-measured cartridges?
By storing the resin and catalyst separately in the cartridge
What must be done to start using epoxy cartridges?
Break the seal between the two components with a plunger
What is one of the advantages of disposable cartridges for two-component materials?
They store, mix, and apply materials separately
How is the resin dispensed after mixing in pre-packaged materials?
By cutting the package with scissors
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
What should not be disposed of in general waste bins?
Unmixed, uncured polyester resin/epoxy
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
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
Why is it advisable to contact local hazardous-material-collection agencies?
For proper disposal of large quantities of uncured product, accelerators, and catalysts
Test your knowledge on fabric weaving techniques like unidirectional fibers held by cross threads and bidirectional/multi-directional fabric orientation. Learn about the characteristics of fabrics that are not woven together with fill fibers.
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