問題一覧
1
In aircraft engineering terms, a composite usually consists of
a plastic resin matrix and reinforcing fibres of various materials.
2
Epoxy resins
are the most widely used resin types for aerospace adhesive and composite applications.
3
Epoxy resins advantage that they
do not react with the solvents and dopes used for fabric coverings.
4
a thermosetting resin
once cured , it cannot be become liquid again by heating .
5
A disadvantages of Thermoplastic
lack rigidity not commonly used for aeronautical composite resins.
6
a resin characteristics
Have ambient temperature storage
7
Cyanate esters
the material’s has dielectric properties for manufacturing high speed radomes.
8
The composite part must be as strong and durable as
the original.
9
the fibres in composite can be wound tightly to increase
strength
10
Non-heat treatable aluminum alloys can be hardened by
strain hardening.
11
In (5052-H24) the letter H indicates
Strain hardening .
12
The composite structural defect of separation of composite panel plies is called
delamination.
13
Common method of non-destructive of composite material are:
●Tap test ●Ultrasonic inspection ●Radiography/ X ray ●Vibration method and ●Thermal imaging
14
Specific repair instruction and limitations of damage of composite are provided in
Structural Repair Manual.
15
Adhesive joints are liable to experience main types of stress:
●Tensile ●Shear ●Cleavage and ●Peel .
16
proposed repair scheme should meet all the original design requirements
for the structure.
17
Strength
is the name of the ability to support load without breaking.
18
Impact resistance
is the ability of a material to withstand impact without shattering.
19
Stiffness
is the ability of a material to support a load without bending too much.
20
The name given to the longitudinal direction of the fiber in woven fabric is
warp
21
is a standard soda glass in common use for windows , etc.
‘A’ Glass
22
is high resistance to corrosive materials. It is normally produced and used only as a surface matt to reduce cost
C’ Glass
23
is an improved electrical grade of glass for modern radomes
D’ Glass
24
A fibre made
of glass.
25
do not resist flame well and burn through more quickly than other fibres.
Aramid fibres
26
are made from pure carbon and are black in colour.
Carbon fibres
27
Carbon fibre composites are known of these general characteristics :
High tensile strength and High compressive strength
28
Ceramic fibres are used in heat resistant blankets and to weave fireproof cloth for engine and pylon protection.
high temperature application is required ,e.g. a firewall.
29
Phenolics are fairly brittle system but they have a
good fire/smoke toxicity performance.
30
are two or three-part systems have good environmental resistance and heat resistance up to150˚C.
Polyesters
31
Polyester fabric, used on a fabric covered airplane may be attached to the structure by
strings or by use of fabric adhesives.
32
is a simple structure built-up from layers of cloth impregnated with resin.
A laminate
33
Plastics are made from materials obtained from
animal or vegetable products and coal or petroleum by-products.
34
Most aircraft control system pulleys are made from
Tufnol
35
The best type of wood to be used in the construction of aircraft is
Sitka Spruce
36
The standard wood type for aircraft wood structures is
Spruce
37
When selecting wood suitable for aircraft structural use, the growth
rate should be more than 6 rings per inch (25 mm).
38
The usual method of repairing elongated bolts in a wooden structure is done by
fitting steel bushes.
39
Ring shake defect of wood is indicated by a parting of the
annular rings.
40
A visible wrinkle found across the face of piece of wood , in a wooden structural member , is most likely
a compression shake caused by compression load.
41
On a wooden aircraft structure if there is no evidence of fiber adhesion in the glue in a failed glued joint,
this may indicate glue deterioration .
42
Curved wooden parts are made by
soaking or steaming wood strips then clamping in a jig to set the bend.
43
wood shrinkage occurs greatest in the
tangential direction to the growth ring.
44
Fish – eyes are small areas which have not dried uniformly due to
surface contamination with oil, wax or silicone products.
45
Iron oxide is sometimes added to aircraft dope to improve its
durability to adhesion
46
Retarder is used to slow the drying time of dope finishes to prevent
blush
47
is the only inspection method for identifying excess tension in aircraft fabric covering .
Observation
48
Excessive tension in aircraft fabric is
usually caused by excessive dope film on new covering.
49
Fabric repair seams on a fabric covered aeroplane should be
covered with tape.
50
Lacing cord or stringing chord used on aircraft fabric covering must have a minimum breaking strength of
60 Ib
51
Lap seam is the only seam type in a fabric covering requires that the selvedge be left on ,or the fabric edge cut with
pinking shears.
52
The name of time between heating and quenching
is cooling time (typically seven seconds)