Composites

Question 1

are the combination of the first three materials which are metals, ceramics and polymers.

Answer 1

Composite materials

Question 2

is considered to be any multiphase material that exhibits a significant proportion of the properties of both constituent phases such that a better combination of properties is realized.

Answer 2

composite

Question 3

of composite materials which consists
of four main divisions:

Answer 3

particle-reinforced, fiber-reinforced, structural, and nanocomposites.

Question 4

a common large- particle composite in which both matrix and dispersed phases
are ceramic materials.

Answer 4

Concrete

Question 5

most important composites are those in which the dispersed phase

Answer 5

form of a
fiber. Design

Question 6

Fibers for which its length is greater than the critical length (lc) (normally l > 15 lc) are

Answer 6

continuous;

Question 7

On the basis of diameter and character, fibers are grouped into three different classifications:

Answer 7

whiskers, fibers, and wires.

Question 8

These are very thin single crystals that have extremely large length-to-diameter ratios;
they are among the strongest known materials.

Answer 8

Whiskers

Question 9

Whisker materials

Answer 9

graphite, silicon carbide, silicon nitride, and aluminum oxide

Question 10

are either polycrystalline or amorphous and have
small diameters

Answer 10

Fibers

Question 11

have relatively large diameters; typical materials include steel, molybdenum,
and tungsten

Answer 11

Wire

Question 12

simply a composite consisting of glass fibers, either continuous or
discontinuous, contained within a polymer matrix. T

Answer 12

Fiber glass

Question 13

There are a number of aramid materials; the two of the most common trade names

Answer 13

Kevlar and Nomex.

Question 14

The most widely used and least expensive polymer resins are the

Answer 14

polyesters and
vinyl esters.

Question 15

Some of the advantages of these materials over the polymer-matrix composites include

Answer 15

higher operating temperatures, nonflammability, and greater resistance to degradation by organic fluids.

Question 16

are inherently resilient to oxidation and deterioration at elevated
temperatures; were it not for their disposition to brittle fracture, some of these materials would be ideal candidates for use in high temperature and severe-stress applications, specifically for components in automobile and aircraft gas turbine engines.

Answer 16

Ceramic materials

Question 17

used for the manufacture of components having continuous lengths and a
constant cross-sectional shape (i.e.,rods,tubes,beams,etc.).

Answer 17

I.Pultrusion

Question 18

composite industry’s term for continuous-fiber reinforcement
preimpregnated with a polymer resin that is only partially cured.

Answer 18

Prepreg

Question 19

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

Answer 19

Filament Winding

Question 20

is composed of two-dimensional sheets or panels that have a
preferred high-strength direction such as is found in wood and continuous and aligned fiberreinforced plastics.

Answer 20

laminar composite

Question 21

are designed to be
light-weight beams or panels having relatively high stiffness and strengths.

Answer 21

Sandwich panels,

Question 22

composed of nanosized particles (or nanoparticles) that are
embedded in a matrix material.

Answer 22

NANOCOMPOSITES

Question 23

CERAMIC-MATRIX COMPOSITES

Answer 23

CARBON–CARBON COMPOSITES
HYBRID COMPOSITES

Question 24

POLYMER–MATRIX COMPOSITES

Answer 24

Glass Fiber–Reinforced Polymer (GFRP) Composites
Carbon Fiber–Reinforced Polymer (CFRP) Composites
Aramid Fiber–Reinforced Polymer Composites