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mod 6 > m6. composite materials m > Flashcards

m6. composite materials m Flashcards

1
Q

what is the term composite used to describe?

A

two or more materials combined to form a much stronger structure than the material by itself

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2
Q

wat are composite composed of?

A

a matrix and re reinforcing fibers

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3
Q

what state is the matrix and the reinforcing fibbers?

A

matrix is a liquid
reinforcing fibbers are a solid

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4
Q

what is the third component added to the composite?

A

a core material

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5
Q

what are the advantages of composite?

A

high strength to weight ratio
longer service life
higher corrosion resistance
design flexibility
easily repairable

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6
Q

what are the disadvantages of composites?

A

difficult for inspections
lack of long term design data base
expensive
toxic and hazardous
lack of methodology

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7
Q

what are the reinforcing fibers?

A

fiberglass
aramid
black graphite / carbon fibre
boron
ceramic

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8
Q

what is the most widely used composite?

A

fibereglass

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9
Q

how is fibre glass made?

A

glass heated up until molten then feed it through small holes to create glass filaments

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10
Q

what is the advantage of fibreglass?

A

less expensive
does not conduct electricity

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11
Q

what are the 2 most common types of fibreglass?

A

E glass and S glass

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12
Q

what is another name for aramid?

A

Kevlar

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13
Q

what types of aramid are the most communally used?

A

49 and 29

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14
Q

what are the advantages of aramid?

A

low density
flexible
high tensile strength
non flammable and non fusible
heat resistant
good chemical resistance
high toughness

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15
Q

what prevents aramid turning brown?

A

protection from the environment

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16
Q

carbon fibre is very what?

A

strong and used for its rigid property’s

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17
Q

carbon fibre has stronger compressive strength than what?

A

Kevlar

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18
Q

what are the advantages of carbon fibre?

A

high strength
low density
low fracture resistance
resistance to high temps
good electrical conductivity property’s

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19
Q

what are two different materials we use as sandpaper and which one will last longer?

A

aluminum oxide and silicon carbide
silicon carbide lasts longer

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20
Q

how is boron made?

A

apply small amount of vaporized boron onto tin tungsten or carbon wire

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21
Q

what is boron used for?

A

cracked aluminum parts and panels

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22
Q

wat are the advantages of boron?

A

excellent compressive strength
high tensile strength
high stiffness
very hard wearing

23
Q

when are cermic fibers used?

A

when high temp application is needed

24
Q

cermic reattains most of its strength and flexibility up to what temperature?

A

1200 degrease Celsius

25
Q

what is the warp?

A

along the length of the fabric

26
Q

what is the weft / fill?

A

perpendicular to the warp fibers

27
Q

what is the salvage edge

A

tightly woven edge
parallel to warp threads
prevents unraveling

28
Q

what is the bias?

A

45 degree angle to warp threads

29
Q

what are the different styles of fabric?

A

unidirectional
bidirectional
quai isotropic
mats

30
Q

what are unidirectional fibers?

A

major fiber runs in warp direction

31
Q

what are bidirectional fibres?

A

fibres run in two or more directions

32
Q

what is quasi isotropic lay up?

A

carbon fiber piles stacked in 0, -45, 45, 90 or 0, -60, 60

33
Q

what are mats?

A

chopped fibers that are compressed

33
Q

the orientation of the lay up results in what?

A

constant strength and stiffness

34
Q

wat are mats used with?

A

woven or unidirectional layers of fabric

35
Q

where are mats used?

A

marine industry

36
Q

wat are fibric waves resistant to?

A

fibre break out
delamination
damage

37
Q

what are the most common types of plain weaves?

A

plain
twill
satin

38
Q

what are the characteristics of a plain weave?

A

simplest form of weave
stable
difficult to cover complex shapes
high degree of crimp

39
Q

what is the characteristics a twill weave?

A

provide superior wet out to plain weaves
flatter
more mechanical properties bc of reduced crimp

40
Q

what are the characteristics of a satin weave?

A

modified twill weaves with fewer inter sections
flat
facilitates wetting out
good mechanical properties
difficult to handle
used for repairs

41
Q

wat is the matrix?

A

bonding material that surrounds the fibers

41
Q

what is an example of an early matrix?

A

polyester

42
Q

what does a resin matrix consist of?

A

resin and a hardener

43
Q

what are the two general categories of plastics?

A

thermosetting
thermoplastic

44
Q

what are thermosetting plastics?

A

use heat or a catalyst to set
low melting points
can not change from new position

44
Q

what are thermoplastics?

A

heat up to form desired shape
can be reheated to change shape

44
Q

what uses epoxy resins?

A

most advanced composite materials

45
Q

what are epoxy resins well know for?

A

good strength and resistance to moisture and chemicals

46
Q

is every type of epoxy suitable for every repair?

A

no

47
Q

where is information about epoxy resins?

A

product safety data sheet

48
Q

what are pre pregs?

A

fabrics that already have the correct amount of resin already saturated into the fabric

49
Q
A

mod 6 (12 decks)

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