Chapter 16

Question 1

composite

Answer 1

any multiphase material that exhibits a significant proportion of the properties of both consitituent phases such that a better combination is realized

Question 2

principle of combined action

Answer 2

better property combinations are fashioned by the judicious combination of two or more distinct materials

Question 3

matrix phase

Answer 3

• continuous and surrounds the other phase
• glue that holds everything together, binds fibers
• protects fibers from mechanical abrasion which prevents cracks from propagating from fiber to fiber

Question 4

dispersed phase

Answer 4

for composites and some two-phase alloys, the

discontinuous phase surrounded by the matrix phase

Question 5

PMC

Answer 5

polymer matrix composite

Question 6

GFRP

Answer 6

glass fiber reinforced polymer (ex. pipe)

Question 7

CFRP

Answer 7

carbon fiber reinforced polymer (ex. tennis rackets, fishing pole)

Question 8

CMC

Answer 8

ceramic matrix composite

Question 9

EDM

Answer 9

electrical discharge machining (also called spark machining)

Question 10

4 groups of composites

Answer 10

particle reinforced (concrete & tires), fiber reinforced (fiberglass composites), structural (tennis court & ski), and nano

Question 11

pultrusion

Answer 11

-continuous-fiber rovings are first impregnated
with a thermosetting resin
-these are then pulled through a steel die that preforms to the desired shape
-the stock then passes through a curing die that is precision machined so as to impart the final shape
-this die is also heated to initiate curing of the resin matrix
-a pulling device draws the stock through the dies
and also determines the production speed.

Question 12

filament winding

Answer 12

process by which continuous reinforcing fibers are accurately positioned in a predetermined pattern to form a hollow (usually cylindrical) shape

Question 13

properties of composites depend on:

Answer 13

• constituent phases
• amount of those phases
• geometry of dispersed phase