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Flashcards in Quiz 2 Deck (141):
1

What is a clean room?

A clean room is a room in which the amount of airborne particles are controlled in order to limit contamination.

2

What is constructed and operated in a manner to control the introduction, generation, and retention of contaminates inside a space?

A clean room

3

Filtered air flows into a clean room by what?

High Efficiency Particulate Air (HEPA) Filters

4

What are the two types of clean rooms?

Hard Wall
Soft Wall

5

True or False? Hard Wall clean rooms are typically cleaner than Soft Wall clean rooms.

True

6

Clean rooms can also be classified by the direction of air flow. What are the two directions of air flow?

Horizontal:
Air moves parallel to the floor across the room.

Vertical:
Air moves from the top of the room and goes down.

7

Clean rooms are classified under the ISO Standard 14644. What is the least clean ISO, and what is the most clean?

Least: ISO Class 9

Most: ISO Class 1

8

The ISO Standard 14644, is classified base on the ___ and _____ of air borne particles in a clean room.

amount and size

9

The ISO Class 7 and ISO Class 5 are the ______ _____ ______.

most commonly used

10

True or False? Between ISO Class 7 and ISO Class 5, the more clean the room is, the more precaution must be used.

True

11

1. You must remove cardboard, paper, or fiber outer packaging before gowning up and entering the clean room. Why?

Paper and cardboard excessively shed particles, and fibers are prohibited from clean rooms.

12

Only clean room ______ and ____ may be used in a clean room. And if regular paper is used, it must be sealed in a _______ ______.

paper and notebooks

must be sealed in a plastic sheet

13

True or False? Only ball point pens without caps should be used in a clean room.

True

14

If you don't know if an item is prohibited in the clean room, consult who?

Contamination Control Engineer or your Manager

15

Gowning ISO Class 7 or 8; You should always gown from top to bottom. True or False?

True

16

Gowning ISO Class 5 or 6; requires you to wear a coveralls or bunny suit. Also includes a hood and boot. True or False?

True

17

Moving around quickly can produce ___ % more particles, then moving slowly.

50%

18

De-Gowning goes in _____ order.

reverse

19

ESD is what? And must be worn under both the garment and sealed gloves.

Electro Static Discharge

20

Practicing proper clean room ____ is need to maintain a clean room environment, and helps insure the safety and success of a given project.

procedures

21

On a single Venturi Vacuum,, the brass nozzle convert the compressed air into a very tight bead of compressed air at a fast velocity, which creates the _______.

Vacuum.

22

The air would come through the the brass nozzle, down through the vacuum port and through the receiver section of the pump. Which vacuum pump am I referring to?

Single Venturi Vacuum

23

Taking the compressed air through a nozzle, creating a vacuum in a chamber. The air is recycled through another Venturi (A brass nozzle) creating vacuum in a second stage, and creating a vacuum in a third chamber. Which vacuum pump am I referring to?

Multi Venturi Vacuum

24

What vacuum pump uses less compressed air and has more vacuum flow?

Mult-Venturi Vacuum

25

You can only get ___ - ___
cubic feet of vacuum flow in a single venturi.

10-15, because of size restrictions

26

In a multi Venturi you can get ____ cubic feet of vacuum flow.

25

27

Use a ______ when you need more than 25 cubic feet of a single body.

Manifold

28

Bolt the manifold to the _____ 2 times. Allowing 50 cubic feet of vacuum.

pump

29

If you need 100 cubic feet, you will put ____ pumps on a manifold.

4

30

200 cubic fee, you will put ___ pumps on the manifold.

8

31

Dispatch composite curing system is an ______.

out of autoclave

32

Uniflow air flow meaning what?

moves both horizontally and vertically offering temperature uniformity.

33

the precise airflow pattern and directional can be modified for each application to optimize the ___ ____ ______ for the specific part being cured.

time to temperature

34

Air is being directed to the part and recirculated through the ____ ____ and back into the oven for greater energy efficiency.

heater box

35

True or False? The composite industry is shifting to out of autoclave vacuum bagging processes.

True

36

The vacuum bagging technique begins with the _____ _____ which is typically secured on top of a movable cart.

base mold

37

A release agent is applied to the mold and a prepreg layup to be cured is placed on ____.

Top

38

Thermocouples are then applied to the _____ lay up in all areas to ensure that the part is cured completely and uniformly.

pre-preg

39

Jack panels on the oven allow connection for as many thermocouples as necessary. Secondary thermocouples can be added as an ______ back up in case of failure.

automatic

40

The ____ bag is the last item to be placed and is sealed securely over the part.

vacuum

41

The cart is rolled into the item and vacuum connection ports are attached. Vacuum hoses are hooked up up to the connection ports. The air is drawn out of the bag and the part is ready to be cured.

Utilizing the _____ point ___ system.

focal point control system

42

The focal point control system is _____. With remote, i/o- 4 part thermosouple systems include: vacuum systems, and compressed air systems.

modular

43

Prior to starting the ___, batch data is entered is entered manually or by bar-code scan. Recipe data is added through focal points advanced recipe editor program.

cure

44

All documented batch part and oven process data is appended to a main file for inspection/review. Exported to either CVS or ____ format.

SQL

45

True or False? Dispatch composite curing system is good for other processes like aluminum aging and basic curing.

True

46

What is step 1 of Endothermic and exothermic reactions?

Energy must be supplied to break chemical bonds.

47

What is step 2 of endothermic and exothermic reactions?

Energy is released when a new chemical bonds are made

48

What reaction is it, if more energy is RELEASED than supplied?

Exothermic (tip: an ex-lover releases energy by smashing your things)

49

What reaction is it, if more energy is SUPPLIED than is released?

Endothermic (tip: to prepare for the end of the world you need supplies)

50

A chemical reaction that requires or absorbs heat.

Endothermic

51

What is an example of endothermic?

Photosynthesis

52

________ reaction, heat is taken in and temperature of the substance drops

edothermic

53

A chemical reaction that releases heat.

exothermic

54

______ reaction, heat given off and temperature of substance rises.

exothermic

55

More energy is given out than is taken in by burning, respiration, etc.

exothermic

56

energy is taken in but not necessarily given out.

endothermic

57

What are examples of exothermic?

combustion fuels
yeast & hydrogen peroxide
Epson salts & water

58

What are the examples of endothermic?

photosynthesis
acetic acid and sodium bicarbonate

59

It is important to mix ____ resin correctly.

epoxy

60

Carbon fiber is ___ and ___ than fiberglass.

lighter and stiffer

61

The nature of carbon fiber is very ____, ___, and _____.

light, rigid, and strong

62

Most ____ - ____ performance products are being manufactured with carbon fiber.

weight-critical

63

Carbon fiber is very strong and very rigid, while fiber glass is ____>

strong but not as rigid

64

In applications where a small amount of flexibility is desired, _____ _____ is the material of choice.

carbon fiber

65

In applications where a small amount of flexibility is desired, ________ is probably better suited.

fiberglass

66

_____ is better suited to extreme flex patterns.

fiberglass

67

_____ has a relatively small flex window.

carbon fiber

68

any ______ composite is tough.

thermoplastic

69

Fiberglass is actually a _____ material than carbon fiber.

tougher

70

The ability to flex farther without breaking, in general it acts as a _____ material

tougher

71

the incredible ____ of carbon makes it less capable of enduring certain abuses than fiberglass.

rigidity

72

_____ strands of carbon fibers are very difficult and expensive to manufacture, while fiberglass processes much easier.

long

73

____ is considerably less expensive than carbon fiber.

fiberglass

74

What does VIP stand for?

Vacuum infusion process

75

What is vacuum infusion process?

Is a production process used to make parts out of fiber-reinforced polymers (FRP).

76

What is FRP?

Fiber-reinforced polymers

77

____ _____ uses negative pressure to pull out air, while impregnating the reinforcement with resin.

vacuum infusion

78

What does VIP stand for?

Vacuum infusion process

79

What is a VIP?

production process used to make parts out of FRP.

80

How does VIP work?

Vacuum infusion uses negative pressure to pull-out air, while impregnating the reinforcement with resin.

81

Step 1 of VIP?

Dry material are place on either a male or female mold/ thin plastic vacuum bag is sealed

82

using a vacuum pump, air is evacuated and ______ _____ is applied to consolidate the dry materials. Creates a vacuum cavity.

atmospheric pressure

83

Step 2 of VIP?

Resin is introduced into the cavity through resin feeder lines.

84

What are the determining factors for filling time of a VIP part?

Porosity permeability, viscosity of resin,
applied pressure difference,
flow and distance

85

Permeability of the materials is directly proportional to the flow of the ____.

resin

86

Proper infusion requires ___ ____ unless a scored or grooved core is used. Simply put, pathways need to be created to allow the resin to flow.

flow medias

87

The ______ the viscosity of the resin, the lower the flow speed (inversely proportional).

higher

88

A more _____ resin will result in more part saturation.

viscous

89

The ideal viscosity falls in the range of ____ and ____ cps.

100 and 300

90

The bigger the gradient between pressures, the ____ the resin will flow.

faster

91

Not to exceed 54 inches. Adequate flow requires a resin temperature of ___ degrees F or higher.

72

92

For the best infusion process results:

Use a very thin resin
Use very permeable materials
Create the highest pressure differential possible

93

When comparing cycle time of a VIP part to __________________________, it is usually slower.

hand lay-up or spray-up open molding

94

Composite parts made using the Vacuum Infusion Process (VIP) are superior to traditional open molding because they are:

Stronger, Lighter, Cheaper to manufacture

95

Inspections can be done prior to resin being introduced into the part.
If clear ____ _____ is used, the part can be studied for imperfections after infusion.

gel coat

96

What does VOC stand for?

Volatile Organic Compounds

97

What does HAP stand for?

Hazardous Air Pollutants

98

____ is gaining popularity because of relatively low capital investment and an easily manageable learning curve.

VIP

99

Advantage of VIP?

Ability to conform to simple and complex shapes

Control of part thickness

A stronger laminate

100

FRP Composites for short, use a ______ resin as the matrix, which holds the structural fiber firmly in place.

thermosetting

101

What are common thermosetting resins?

Polyester ResinVinyl Ester ResinEpoxyPhenolicUrethane

102

What is the most common thermosetting resin used today?

Polyester resin, followed by vinyl ester and epoxy

103

What are thermosetting resin popular?

uncured, at room temperature, they are in a liquid state.his allows for convenient impregnation of reinforcing fibers such as fiberglass, carbon fiber, or Kevlar.

104

In thermoset resin, Laminators can easily remove all air during manufacturing, and it also allows the ability to rapidly manufacture products using______ or positive pressure pump.

a vacuum

105

____ ____ ____ Beyond ease of manufacturing, thermosetting resins can exhibit excellent properties at a low raw material cost.

(Closed Molds Manufacturing)

106

Properties of thermoset resins include

Excellent resistance to solvents and corrosivesResistance to heat and high temperatureFatigue strengthTailored elasticityExcellent adhesionExcellent finishing (polishing, painting, etc.)

107

In a thermoset resin, the raw uncured resin molecules are crossed linked through a ____ _____ ____.

catalytic chemical reaction.

108

Through this chemical reaction, most often exothermic, the resin creates extremely strong bonds to one another, and the resin changes state from a liquid to a solid. ____ resin

thermoset

109

A______ thermosetting resin, once catalyzed, it cannot be reversed or reformed.

thermosetting

110

Recycle therosetts, removed the resin through _____ and are able to reclaim the reinforcing fiber.

pyrolization

111

______ _____ resins are extremely common, and we come in contact with thermoplastic resins constantly.

Thermoplastic polymer

112

Thermoplastic resins are most commonly ______, meaning, the resin is formed into shapes and have no reinforcement providing strength.

unenforced

113

Many thermoplastic products use short ____ _____ as reinforcement; most commonly fiberglass, but carbon fiber, too.

discontinuous fibers

This increases the mechanical properties and is technically considered a fiber reinforced composite, however, the strength is not nearly as comparable to continuous fiber reinforced composites.

114

n general, FRP composites refers to the use of reinforcing fibers with a length of___ or greater.

¼"

115

thermoplastic resins have been used with ____ _____ creating structural composite products.

continuous fiber

116

What are the two major advantages of thermoplastic composites?

Increase impact resistance
ability to reform

117

Raw thermoplastic composites, at room temperature, are in a ___ state.

solid

118

For ____ _____ When heat and pressure impregnate a reinforcing fiber, a physical change occurs; not a chemical reaction as with a thermoset.

thermoplastic composites

119

What is the disadvantage of thermoplastics?

Difficult to impregnate reinforcing fiber.

120

In thermoplastics, the resin must be heated to the ____ _____, and pressure is required to impregnate fibers, and the composite must then be cooled under this pressure.

melting point

121

What is the major disadvantage of thermoplastic composite?

special tooling, technique, and equipment must be used = expensive

122

For panels ____ tooling is normally preferred because it maintains aero quality.

female

123

What are the two exceptions to female tooling?

fier placing and filament winding

124

For structure ribs, spars, frames, ____ tooling is preferred because it produces best laminate quality, easier to remove parts.

male

125

____ tools for structure provide best interfaces for assembly operations.

female

126

Male tooling is ____.

concave

127

female tooling is _____.

convex

128

Cure for many non-structural applications temp?

250

129

Cure temp for most commercial aircraft structural application?

350

130

what does CTE stand for?

Coefficient of Thermal Expanion

131

3 categories for CTE?

tooling material, cure temp, tool size

132

Why would you want to have thermal growth?

provide additional pressure to laminate

133

Common practice is to closely match the tools CTE with the ___ ____ cte.

part material

134

Dissimilar materials are frequently used in composite tools for

carbon fiber face sheet
tubular steel substructures
brush in working holes

135

in dissimilar materials, ____ ____ need to accommodate differences in thermal growth

attach points

136

___ ___ tools can be produced much quicker than very durable ones.

less-durable

137

____ tools are generally most expensive.

metal

138

____ tools are most durable.

metal

139

what is a low cte alloy, invented in 1896?

invar 36

140

___ _____ typically not used for aerospace composite tooling.

gel coats

141

best predictor of laminate life is ____ ____ ____.

Glass Transition Temp (TG)