Chapter 14.) Composites

With what kinds of products is tube rolling associated?

Bicycle frames, fishing poles, blind person canes and space trusses.

When is the tread pattern imprinted onto the circumference of the tire

during molding

Pulforming is similar to pultrusion but is capable of producing a semicircular contour with altered cross sections at one or more locations along the length of the part:

True

Which of the following ingredients do not contribute to the vulcanizing process (two correct answers)

carbon black and calcium carbonate

"Of the following rubber additives, which one would rank as the single most important"

"carbon black"

A polymer matrix composite is a composite material consisting of a ceramic embedded with a reinforcing phase such as fibers or powders:

False

A molding operation that uses sheet-molding compound is a form of which one of the following

compression molding

The chemical name of the ingredient recovered from the latex of the rubber tree is which one of the following

polyisoprene

Which one of the following is the most common polymer type in fiber-reinforced polymer composites:

thermosets

Name the four basic categories of processes used to shape rubber.

(1) extrusion, (2) calendering, (3) coating, and (4) molding.

What is the sequence of processing steps required to produce finished rubber goods?

(1) production of the raw rubber, (2) compounding, (3) mixing, (4) shaping, and (5) vulcanization.

How is the rubber industry organized?

(1) rubber growing plantations produce natural rubber, (2) the petrochemical industry produces synthetic rubber, and (3) fabricators take the NR and SR and produce finished rubber goods.

How are FRPs cut?

Uncured are cut by methods that include knives, scissors, power shears, steel?rule blanking dies, laser beam cutting, and water jet cutting. Cured are cut by cemented carbides and HSS cutting tools, diamond cutting tools, and water jet cutting.

The special tooling in filament winding that determines the shape of the filament-wound part is called which one of the following

Mandrel

"Water jet cutting is one of several ways of cutting or trimming uncured or cured FRPs; in the case of cured FRPs, the process is noted for its reduction of dust and noise: "

True

What are some of the additives that are combined with rubber during compounding?

Vulcanizing chemicals, reinforcing fillers, extenders to reduce cost, antioxidants, coloring pigments, plasticizers to soften the rubber, and blowing agents to make foam rubber.

Which of the following products are not typically made by hand lay-up open mold operations (two best answers)

tennis rackets, fishing poles

How is raw rubber recovered from the latex that is tapped from a rubber tree?

the latex is collected into tanks and diluted to half natural concentration; (2) formic or acetic or other acid is added to the solution which causes the rubber to coagulate; (3) the coagulum is then squeezed through rolls to drive off water; and (4) the resulting sheets are dried in smokehouses for several days.

The advantage of using an open mold is which one of the following

the mold costs much less than if two matching molds were used