Composite Basics MS-126

Question 1

What is a composite material?

Answer 1

Two or more chemically distinct materials, when combined have improved properties over individual materials. Composite could be natural or synthetic.

Question 2

Composites are combination of two materials in which one of the material is called the _______ ________.

Answer 2

reinforcing phase

Question 3

In the form of fibers, sheets or particles and is embedded in the other material is called the _____ -______.

Answer 3

matrix phase

Question 4

Typically, ____ ______ are strong with low densities while the matrix is usually a ductile or tough material.

Answer 4

reinforcing material

Question 5

______ _____ is two inherently different materials that when combined together produce a material with properties that exceed the constituent materials.

Answer 5

composite material

Question 6

Typically, reinforcing materials are strong with low densities, while the matrix is usually a ____ or _____ material.

Answer 6

ductile or tough material

Question 7

If composite is designed and fabricated correctly, it combines the strength of the reinforcement with the toughness of the ____ to achieve a combination of desirable properties not available in any single conventional materials.

Answer 7

matrix

Question 8

Glass, Carbon, organic, boron, ceramic, metallic are all ____ ____.

Answer 8

reinforcement fibers

Question 9

polymers, metal, ceramics are all ____ ______.

Answer 9

matrix materials

Question 10

bonding surface is _____.

Answer 10

interface

Question 11

weight of aramid fibers are the lightest at ___ -____ g/cc

Answer 11

1.3-1.4 g/cc

Question 12

carbon _____ g/c

Answer 12

1.79 g/cc

Question 13

Fiberglass is the heaviest ____ g/cc.

Answer 13

2.4 g/cc

Question 14

strength carbon is is the strongest at ____ - ____ ksi

Answer 14

600-800 ksi

Question 15

Fiberglass ____ - ____ ksi

Answer 15

400-600 ksi

Question 16

aramids _____ ksi

Answer 16

400 ksi

Question 17

Impact resistance Kevlar is the _____. Next is fiberglass, then carbon.

Answer 17

toughest

Question 18

Carbon is the stiffest at ___ - ____ msi

Answer 18

30-40 msi

Question 19

Aramid stiffness __ msi

Answer 19

14 msi

Question 20

Fiberglass stiffness ___ -___ msi

Answer 20

10-13 msi

Question 21

_____ is cost effective

Answer 21

fiberglass

Question 22

______ is the least cost effective.

Answer 22

carbon

Question 23

Series of interlaced yarns at 90 degrees to each other

Answer 23

woven

Question 24

series of interloped yarns

Answer 24

knit

Question 25

series of intertwined, spiral yarns

Answer 25

braided

Question 26

oriented fibers either mechanically, chemically, or thermally bonded

Answer 26

nonwoven

Question 27

___ goes longitudinal

Answer 27

End

Question 28

___ goes horizontal

Answer 28

pick

Question 29

X axis _____ ____>

Answer 29

fill direction

Question 30

Y axis ____ _____

Answer 30

warp direction

Question 31

Plain weave offers ____ _____, and ______ _____

Answer 31

fabric integrity, and dimensional stability

Question 32

satin 5hs weave offers ___ ____ and _____ _____ of fiber properties.

Answer 32

smoother face, improved translation of fiber properties

Question 33

2x2 Twill weave offers

Answer 33

excellent drape-ability, conformity

Question 34

non-crimp weave offers

Answer 34

minimum crimp in yarns, dimensional stability

Question 35

A ___ consists of two sets of yarn, which are hectically intertwined. Resulting structure is oriented to the longitudinal axis of the ___.

Answer 35

brain

Question 36

Types of braids

Answer 36

diamond brain, regular brain, Hercules braid

Question 37

A system of longitudinal yarns can be introduce which are held in place by the braiding yards. These yarns will ad dimensional stability, improve tensile properties, stiffness, etc. What am I?

Answer 37

triaxial yarns

Question 38

concept of composites is that the load is applied over a larger surface area of the _____.

Answer 38

matrix

Question 39

matrix then transfers the load to the _______, which being stiffer, increases the strength of the composite.

Answer 39

reinforcement

Question 40

about ____ % of all composites are produced are comprised of glass fiber and either polyester or vinylester resin.

Answer 40

90

Question 41

_____ ____ composites offer higher modulus of elasticity, ductility and resistance to elevated temperatures than polymer matrix. but are heavy and difficult to process.

Answer 41

metal matrix

Question 42

____ matrix composites are used in applications where resistance to high temp and corrosive environment is designer CMC are strong and stiff by they lack toughness.

Answer 42

ceramic matrix composites

Question 43

____ are heterogeneous

Answer 43

composites

Question 44

____ are highly anisotropic

Answer 44

composite