Industrial Materials 2320 Final

Materials test in which the load is applied gradually

Static

Consistency of the results when tests are run on the same sample

Repeatability

A test in which human judgement and/or skill plays no significant role

Objective

Machinability would be considered a

Processing property

Material choice in manufacturing is always a compromise between

Technical requirements & cost

The amount of heat energy required to raise one pound of water one *F is one

BTU

Specific gravity is expressed in which of the following units?

None

A 140kg person stands on a platform. The force being applied to the platform is

1372N

A cylindrical tank is 1 foot in diameter, 3 feet tall, and filled with water. What will be the pressure on the bottom of the tank?

187.2 lbs/ft^2

Property generally considered the opposite of brittleness

Toughness

Ability of a material to return to its original size and shape once a load has been removed

Elasticity

Property allowing a material to be deformed by compressive loads without failing

Malleability

Property allowing a material to be formed into thin wite

Ductility

Resistance to continuous and repeated loads that do not exceed the elastic limit

Fatigue

A strength generally associated with adhesives

Peel

A material's resistance to bending loads

Flexure

The resistance of a material to deformation from loads over a very long time

Creep

Plastic region

C

Elastic region

A

Elastic limit

B

Rupture (yield) strength

E

The stress at a load of 600lbs is

3000 lbs/in^2

The strain at a load of 800lbs is

.00035 in/in

The rupture strength of this material is

7500 lbs/in^2

The ultimate tensile strength of this material is

9500 lbs/in^2

When a crack appears in a part due to fatigue, about how much of the life of the part is left?

20%

Errors are most likely in shear tests when the sample is placed in

A single shear

Creep tests attempt to accelerate the effects of long term loads by using

Heat

The ultimate compressive strength of the sample is

5660 lbs/in^2

What is its ultimate shear strength in lbs/in^2

12000

The energy absorbed by the sample in this test is

44 ft�lbs

The Brinell, Tukon and Vickers hardness tests actually measure which of the following properties of the surface of the sample?

Plasticity

Uses either a ball or diamond indentor

Rockwell

Measures the elasticity of a surface by bouncing a hard ball from it

Scleroscope

Used to measure hardness of softer and/or very elastic surfaces

Durometer

Makes use of its ultrasonic resonance to determine hardness

Sonadur

The oldest standard industrial hardness test

Brinell

Uses a hardened shell ball indentor

Brinell

Hardness tests of thin samples suffer from errors caused by

Anvil effect

Consider all of the following statements about the Brinell hardness test family

They are only limited to a laboratory environment

The most common Rockwell scale used for very hard materials is

Rc

The Rockwell superficial scales are used to determine the hardness of

Thin samples

The heat treatment of steel in which the metal is heated above the critical temperature and then forced to cool very quickly is

Quench hardening

If the hardness of a steel sample shows little or no difference. Score and after it is quench hardened, the carbon content of the steel is

Low

The oldest surface hardening method id

Carburizing

If a material is cooled from the molten state quickly, grain structure

Becomes finer

Which of the following is the least severe quenching medium

Air

The heat treatment used to remove work hardening in metals is

Process annealing

The traditional metal alloy called bronze consisted of

Copper and tin