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問題一覧
1
what tools are required for visual inspection ?
light source, magnifying glass
2
Is the de-bulking process the same as preparing a final bag for curing? If not, state one difference.
de-bulking required when laying up complex or heavy section components: post cure wrinkles, squeegee, vacuum bag “is the compacting or squeezing out of air and volatiles between plies or prepreg laminates under moderate heat and vacuum. PREVENTS WRINKLES, promotes ADHESION
3
Where would you find ply orientation/sequencing for a layup
drawing
4
What are 2 ways to prepare a mould surface before applying release agents?
1. buffing 2. polishing
5
NDT inspections and personnel are regulated by Transport Canada?
true, regulated by transport Canada
6
What trimming tool leaves a high-quality surface finish by meeting, vaporizing, burning or blowing a jet of gas?
laser
7
What is the purpose of de-bulking?
compacting / squeezing out air between the plies under moderate heat and or vacuum prevents wrinkles, promotes adhesion
8
If the ambient temperature is too cold can it affect a room temperature cure?
yes, can affect room temp cure
9
Why are respirable fibres dangerous?
capable of being taken in by breathing, reaches deepest part of the lungs
10
Should you use waterjet equipment to cut a honeycomb sandwich panel? why or why not?
no, would contaminate honeycomb core.
11
most common wood in composite sandwhich structure?
balsa
12
what is the most commonly used release agent?
wax
13
What is the purpose of tap testing a composite structure?
detects delamination or disbond in composite structure
14
Why is ply orientation and sequence important when performing a layup?
to achieve proper amount of strength of the part in correct directions
15
Can a fabricated part be damaged while separating from a mould?
yes, they can be damaged
16
Why do heating devices need to be controlled?
so the correct amount of heat can be applied to the part curing
17
What is it called when a temperature stays constant?
thermal arrest
18
List 2 advanced trimming tools and techniques:
1. Laser 2. water jet
19
List some examples of damage that can be found using visual inspection.
1. scorch 2. dent 3. abrade 4. stain 5. penetrate 6. chip
20
What is the purpose of weighing fabric?
to find the correct amount of resin mix needed to impregnate material
21
What type of curing process is the most accessible in terms of equipment required?
room temp cure
22
Name 3 examples of release films used to prevent the part curing to the vacuum bag.
1. perforated “allows air and volatiles out of the lay up, prevents bleeder from sticking to the part of repair 2. Parting film “solvent resistant, parting agent for polyester or expoxy resin, will not shrink” 3. peel ply “will stick to laminate, but will pull away without difficulty”. protective layer that peels away 4.solid release film
23
are most honeycombs anisotropic or isotropic?
anisotropic
24
Why create layup tooling/templates for pre-preg layups?
help with repeatability, takes less time
25
Name some techniques for impregnating fabric with resin
1. brush 2. squeege 3. roller 4. vacuum assisted
26
What is the purpose of a mould release agent?
used so the part comes off the mould easily after curing. can be sprayed, brushed, wiped on
27
different types of core materials
1. balsa 2. foam 3. honeycomb 4. aluminum 5. fibreglass 6. nomex
28
Which is the main purpose gel coats are used for?
1. structural “not common for structural use” 2. cosmetic “void filling” 3. protection from water/uv “protects from water egress”
29
What does a sandwich honeycomb panel construction (i.e. floor board) consist of?
two relatively thin face sheets bonded to a relatively thick light core
30
How do thick tools or caul plates affect curing?
1. supports part during curing 2. leaves smooth finish 3. more uniform heated area (hot monitor)
31
What are the 3 main segments of a cure cycle?
1. ramp up, soak, ramp down
32
most common material used for aircraft honey comb
nomex/korex
33
A resin system has to be uniformly cured to meet design parameters.
true, uniform cure is essential
34
Which one below is a release agent?
1. WAX “most common”, room temp only, use rag and buff 2. Poly vinyl alcohol “leaves slight texture, must be polished 3. Parting film “solvent resistant” dissolves in water, won’t shrink
35
In a sandwich panel construction, if the skins are pre-cured, what material are used to bond them to the core?
film adhesives
36
Pre-preg materials can be cured at room temperature?
false, they can’t be cured at room temp
37
is tap testing better on thick or thin composite material?
thin, less than 4 plies
38
What is placed on curing parts to monitor temperature?
thermocouple