Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Manufactoring > composites > Flashcards

composites Flashcards

1
Q

what is PMC

A

polymer matrix composites
a composite consisting of a polymer imbedded with reinforcing phase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what are shaping processes for PMC

A

open/closed mold proocesses
filament winding
pultrusion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a FRP

A

Fibre reinforced polymer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is a reinforcing aject

A

fibres
particles
flakes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what are some of the forms of continuos filiment

A

Roving- untwisted strands
yarn-twisted filiments
cloth-woven yarns
woven roving- fabric constisted of untwisted filaments
Mat- felt consisted if short fibers held together
preforms- mats that are shaped for lclose molding processes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is open mold processes

A

procwsses that use a single positive or negitive mold to produce the sructures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what are 3 examples of open mold processes

A

hand lay up
spray up
automated lay up

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is the process for the hand lay up method

A
  1. coat mold with release agent
  2. a thin coat of resin is appliedto the outside of the mold
  3. when the resin is set more layers of resin and fibers areapplied
  4. part is cured
  5. part is released
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

whhat kind of products are suited for hand lay-up

A

large in size but low in quality

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what can hand lay up molds made from

A

plaster prototypes
FRP - for medium volume
Matel- high volume

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what are some applications for hand lay up

A

boat hulls
swimming pools
large container tanks
other formed sheets

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what is the spray up method

A

liquid resin is sprayed onto an open mold
spray gun moves fibers 1-3 inches long and add them to resin stream

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what are automated tape laying machines

A

a machine that dispenses prepeg tape onto a an open mold

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what are some applications made by spray up methods

A

boat hulls
bath tubs
shower stalls
automoative body parts
rv components
furnature
large structural pannels
containers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is prepeg

A

a composite material made for pre impregnated fibers and parially cured polymer matrix

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what are automated fiber placement machines

A

despenses prepegs in flat bundles of fibers impregnated with resin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

closed mold processes basics

A

preformed in molds with 2 sections
tool costs twice as much as open molding as more complex equipment is required

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what are the advantages of closed mold processes

A

good finish
high production rates
closer control on tolerances
more complex 3 diensional shapes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what are 3 closed molding processes

A

compression
transfer
injection

20
Q

what is are the 2 differnet types of compression molding

A

preform
elastic reservoir

21
Q

what is preform molding

A

placemeny of a pre cut mat into lower mold secrion and resin goes into the fiber mat

22
Q

what is elastic reservoir molding

A

a sandwich of a foam core has liquid resin brought between the 2 dry fiber layers

22
Q

what is tranfer molding in composites

A

very similar to the plastic version in that fluid polymer is transfered fro pot to mold

23
Q

what process can mold thermosets with short fibres

A

transfer molding for composites

24
Q

what is a common variation of tranfer molding

A

resin transfer molding

25
Q

what are the materials in injection molding

A

thermoplastics
thermosets

26
Q

what is the one thing that has to happen in the injection molding

A

the chopped fibers must be used

27
Q

what happens to to the fibers during the injection molding process

A

they become aligned which can create directional properties

28
Q

what is filament winding

A

continuios fibers are wrapped around a rotating mandrel

29
Q

what is pultrsuion

A

similar to extrusion but filament is pulled through a die

30
Q

what are the 5 steps of pultrsuion

A
  1. filament feeding
  2. dipping fibers in resin
    3.pre die forming
  3. shaping and curing
  4. pulling and cutting
31
Q

what are some other PMC shaping composites

A

centrifugal casting
tube rolling
continuous laminating
cutting of FRPs

32
Q

what are the 2 basic steps in good rubber production

A

production of rubber
processing into finished products

33
Q

what are the steps in processing for rubber

A

compounding
mixing
shaping
vulcanizing

34
Q

what is coumpounding

A

adds chemicals for vulcanizing

35
Q

why are dditives added in rubber

A

tgo enhance mechical properties
to extend the rubber cost

36
Q

what is carbon black

A

the most important filler in rubber

37
Q

what is the effect of carbon black

A

increase tensile strength
increase resistance to abrasion and tearing
provides protection for ultraviolet radiation

38
Q

what is mixing

A

additives being mixed into the rubber

39
Q

what are the 2 stages of mixing

A

1) carbon black and non vulcanizing addives are added
2) vulcanizing agents are added

40
Q

what is vulcanization

A

a treatmet that accomplishes the crosslinking of the elastomer

41
Q

what is the purpose of filament reinforcement

A

reducue extenibility but retain other desirable properties

42
Q

what are bthe 4 basic catagories of shaping

A

extrusion
calendering
coatikng
molding/casting

43
Q

what is some exapmes of rubber products

A

footwear
seals
shock absorbition parts
converyor belts
foamed rubber products
sports equipment

44
Q

what sre the 2 types of hoses

A

plain hose
reinforced tube

Manufactoring (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions