Chpt 1

Question 1

Strands

Answer 1

Approx 200 filaments

Question 2

Rovings

Answer 2

Untwisted parallel filaments

Question 3

Yield

Answer 3

Length to weight ratio (m/kg) (yds/lb)

Question 4

Typical yield

Answer 4

225-1800 yds/lb

Question 5

Fabric

Answer 5

Glass fabrics weigh 12-40 oz / sq yd

Question 6

Chopped strand mat

Answer 6

Randomly oriented short fibers

Question 7

Continuous strand mat

Answer 7

Unchopped spiraled fiber

Question 8

Surface veil

Answer 8

Decorative fine weave

Question 9

Carbon fiber diameter

Answer 9

5-10 microns

Question 10

Tows

Answer 10

Bundles of filaments

Most commonly 3k - 12k

Question 11

PAN based fibers

Answer 11

Poly Acrylon Nitrile
carbon fibers made from PAN
Black from oxidation
Some shrinkage

Question 12

Carbon Fiber

Answer 12

Made from PAN fibers

Ladder structure

Question 13

Pitched based Carbon Fiber

Answer 13

Not as string as PAN C.F.

Question 14

Plain weave

Answer 14

Simple criss cross

Thin at .009”

Question 15

Twill Weave

Answer 15

Thicker than Plain Weave, thick .024”

2x2 weave, over 2 tows, then under two tows, next fiber only skips one row

Question 16

Aramid

Answer 16

kevlar, Twaron

Question 17

Kevlar types

Answer 17

Kevlar 29: high toughness
Kevlar 49: high modulus
Kevlar 149: ultra high modulus

Question 18

Satin weave

Answer 18

Many “floats”, not many under warps

Easily drape-able

Question 19

Basket weave

Answer 19

Double down plain weave

Question 20

Leno weave

Answer 20

Locking type, prevents shifting

Question 21

Organic fibers

Answer 21

Bad for heat

Light, strong weight to strength ratio

Question 22

Matrix purpose

Answer 22

Transfer load

Protect reinforcement from elements

Question 23

3 types of matrices

Answer 23

Polymers 
-thermosets
-thermoplastics 
Metals 
Ceramics

Question 24

Thermoset

Answer 24

Liquid at room temp
Cured to strengthen
Cannot be remelted
more rigid than thermoplastic

Question 25

Thermoplastic

Answer 25

Solid at room temp Melted to reshape Can be reprocessed

Question 26

Metals and ceramics

Answer 26

Used in high temp conditions | Higher strength

Question 27

Viscoelastic

Answer 27

Material both viscous and elastic Honey viscous Elastic rubber band Doesn’t always produce the same test results

Question 28

Polyester Matrix

Answer 28

``` VERY COMMON pools, boats, cars Cheap low viscosity Fast cure ``` Doesn’t weather well

Question 29

Inhibitors

Answer 29

Add pot life or storage life

Question 30

Catalysts

Answer 30

Start chemical reaction Peroxide based MEKP

Question 31

Accelerators

Answer 31

Quicken cure time

Question 32

Very little neede

Answer 32

Catalysts and Accelerators | Very flammable

Question 33

Vinyl Ester

Answer 33

Shrinks | Very toxic

Question 34

Epoxy

Answer 34

Better adhesion to fibers/fillers Yellows with age Can be “pre-pregged”

Question 35

Amorphous

Answer 35

Clear, transparent | Good formability

Question 36

Crystalline

Answer 36

Opaque Bad formability Difficult to bond

Question 37

Crystalline products

Answer 37

Low cost Low temp Low strentgh

Question 38

Fiber weight fraction

Answer 38

Weight of fibers ———————————— Total weight of composite

Question 39

Fiber volume fraction

Answer 39

Volume of fibers ———————————- Total composite weight