AIRCRAFT MATERIALS CONSTRUCTION AND REPAIR II (COMPOSITE)

Question 1

Sandwich panels made of metal honeycomb construction are used on modern
aircraft because this type of construction __________ .

Answer 1

has a high strength to weight ratio.

Question 2

The length of time that a catalyzed resin will remain in a workable state is
called the ____________

Answer 2

pot life.

Question 3

A category of plastic material that is capable of softening or flowing “when
reheated is described as a ____________ .

Answer 3

thermoplastic.

Question 4

The classification for high tensile strength fiberglass used in aircraft
structures is _______________.

Answer 4

S.

Question 5

The classification for fiberglass reinforcement material that has high resistivity
and is the most common for is ______ .

Answer 5

E.

Question 6

Composite fabric material is considered to be the strongest in what direction?

Answer 6

warp.

Question 7

Which fiber to resin (percent) ratio for advanced composite wet lay-ups is
generally considered the best for strength?

Answer 7

60:40

Question 8

What is the material layer used within the vacuum bag pressure system to
absorb excess resin during curing called?

Answer 8

Bleeder.

Question 9

Proper pre-preg composite lay-up curing is generally accomplished by
1. applying external heat.
2. room temperature exposure.
3. adding a catalyst or curing agent to the resin.
4. applying pressure.
Which are correct ?

Answer 9

1 and 4.

Question 10

When making repairs to fiberglass, cleaning of the area to be repaired is
essential for a good bond. The final cleaning should be made using…

Answer 10

MEK (methyl ethyl ketone).

Question 11

The part of a replacement honeycomb core that must line up with the
adjacent original is the…

Answer 11

ribbon direction.

Question 12

Which of the following are generally characteristic of aramid fiber (Kevlar)
composites?
1. High tensile strength.
2. Flexibility.
3. Stiffness.
4. Corrosive effect in contact with aluminum.
5. Ability to conduct electricity

Answer 12

1 and 2.

Question 13

Which of the following are generally characteristic of car-bon/graphite fiber
composites?
1. Flexibility.
2. Stiffness.
3. High compressive strength.
4. Corrosive effect in contact with aluminum.
5. Ability to conduct electricity.

Answer 13

2, 3, and 4.

Question 14

____________________is a solid form that provide the primary structural
strength to the composite structure when combined in a matrix?

Answer 14

reinforcing materials.

Question 15

This repair restores full structural properties by forming a joint between the
prepared repair area and the repair patch?

Answer 15

Structural Flush Repair.

Question 16

This occurs when the skin of the sandwich structure becomes separated from
the core?

Answer 16

disbond.

Question 17

This referring to damaged that may be corrected by a simple procedure with
no restrictions on flight operations.

Answer 17

Negligible Damage.

Question 18

Tiny holes, known as pin hole, in the skin are not easily detected however,
they could lead to extensive damage

Answer 18

true.

Question 19

RESIN INJECTION is a type of repair will not regain any strength and is used
only where strength is unimportant. Due to high shrinka

Answer 19

false.

Question 20

A __________ is a localized area of extra layers of reinforcement, usually to
provide stiffness or strength for fastening, or other abrupt load transfers,
such as repairs.

Answer 20

Doubler.

Question 21

In this technique, the objecT which is to be cured is placed into a plastic bag
and the air is evacuated, pressure is applied to the component by surrounding
component.

Answer 21

Vacuum Bagging.

Question 22

_______________ is a manufacturing process that uses a a male and female
mold.The reinforcing fabric is wetted with a matrix or pre-preg materials.

Answer 22

Vacuum Bagging.

Question 23

______________ is a manufacturing method that uses a two part mold
(FEMALE AND MALE MOLD) with the dry fabric laid into the mold.

Answer 23

Resin Transfer Molding.

Question 24

It maybe used to remanufacture a part if the damage is very large and it is
necessary to put the part into the original mold and cure it with high heat and
high pressure.

Answer 24

Autoclaves.

Question 25

It should be used under the heat blanket. It senses the temperature of the part
and relays the information to the controller or monitor.

Answer 25

thermocouple.

Question 26

This reinforcing materials is stronger in compressive strength than Kevlar.
Electrically conductive, have low thermal expansion coefficients, and have high
fatigue resistance.

Answer 26

Carbon Graphite.

Question 27

This reinforcing materials is stronger in compressive strength than Kevlar.
Electrically conductive, have low thermal expansion coefficients, and have high
fatigue resistance.

Answer 27

Fill.

Question 28

How many times does the tensile strength of Kevlar composite is much
better than the aluminum?

Answer 28

4

Question 29

____________materials offer different densities and temperature
characteristics for high-heat applications and fire resistance

Answer 29

foam.

Question 30

_________cannot be cut with a hot wire and this core material is subject to
high heat that produces a hazardous gas

Answer 30

Urathane

Question 31

This resin very useful for bonding nonporous and dissimilar materials.

Answer 31

Epoxy

Question 32

This core materials provide a core with a very high strength to weight ratio &
more flexible than others and may be bent to form a curve.

Answer 32

Foam

Question 33

This reinforcing materials are used when a high temperature application is needed and
this form of composite retains the strength and flexibility at temperature of 2,200 F.

Answer 33

None of the above