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