3A1 Chapter 13: Metallurgy & Materials
questions well answered to pass
Mechanical property - correct answer ✔✔Properties of a material that predict how material will behave
under loads
Mechanical properties of a material depend on: - correct answer ✔✔-Composition
-Grain structure
Property that determines whether material will break or stretch under force
ex. cast iron - correct answer ✔✔Brittleness
Materials resistance to wear, abrasion and penetration
ex. diamond - correct answer ✔✔Hardness
Measure of how much material can be stretched under tensile load without fracturing above elastic limit
Opposite being brittle
ex. copper - correct answer ✔✔Ductility
What happens to a material when its being stretched causing a reduction in the cross sectional area -
correct answer ✔✔Necking
Materials ability to deform by compression without cracking or rupturing
Hammered (cold) into various shapes
Increases when material heated - correct answer ✔✔Malleability
Materials ability to return to its original shape when load is removed - correct answer ✔✔Elasticity
,Material is said to be _______ if its soft and easily deformed
Doesn't return to original shape - correct answer ✔✔Plasticity
Determines materials ability to withstand sudden impact/hard blow - correct answer ✔✔Toughness
Toughness is also known as - correct answer ✔✔Impact strength
Determines mechanical behaviour of material under static loading conditions - correct answer
✔✔Tention testing
Tension testing provides measurement of _________ & ___________ properties of materials - correct
answer ✔✔elastic and plastic
Ratio of applied load to original cross sectional area - correct answer ✔✔Nominal stress
Nominal strain - correct answer ✔✔Ration of elongation to original length
How is elongation determined in tension test? - correct answer ✔✔By measuring change in distance
between 2 gauge points
Distance between gauge points of unstressed specimen - correct answer ✔✔5cm
What is the slope defined as on a stress/strain diagram - correct answer ✔✔Young's Modulus of
Elasticity
What does Young's Modulus of elasticity measure? - correct answer ✔✔Stress required to cause strain
deformation
When this point is reached, specimen will no longer return to original shape - correct answer ✔✔Yield
Point/Elastic limit
, Stress at yield point is referred to as - correct answer ✔✔Yield strength
Ultimate tensile stress is the _________ ___________ of the material - correct answer ✔✔ultimate
strength
Resistance of a material indentation is the basis for testing... - correct answer ✔✔Hardness
Hardened steel or tungsten ball under specific load pressed into material surface - correct answer
✔✔Brinell Hardness Test
Size of ball and time load applied in Brinell Test - correct answer ✔✔10mm, 10-15sec
What do 40, 500, 10 and 20 represent in the following Brinell Hardness Number
40HB 10/500/20 - correct answer ✔✔40 - BHN obtained
10 - ball diameter
500 - kg load applied
20 - seconds load was applied for
Most used, versatile hardness test - correct answer ✔✔Rockwell Hardness Test
How many loads applied in Rockwell Hardness Test? And what do they do? - correct answer ✔✔1st-
preload removes any effects of surface impurities
2nd- major load, increases depth of indentation
Difference in _________ ________ provides Rockwell hardness number - correct answer ✔✔indentation
depth
Describe B reading Rockwell Test - correct answer ✔✔-Soft material
-1.6mm indent piece
-10kg load
questions well answered to pass
Mechanical property - correct answer ✔✔Properties of a material that predict how material will behave
under loads
Mechanical properties of a material depend on: - correct answer ✔✔-Composition
-Grain structure
Property that determines whether material will break or stretch under force
ex. cast iron - correct answer ✔✔Brittleness
Materials resistance to wear, abrasion and penetration
ex. diamond - correct answer ✔✔Hardness
Measure of how much material can be stretched under tensile load without fracturing above elastic limit
Opposite being brittle
ex. copper - correct answer ✔✔Ductility
What happens to a material when its being stretched causing a reduction in the cross sectional area -
correct answer ✔✔Necking
Materials ability to deform by compression without cracking or rupturing
Hammered (cold) into various shapes
Increases when material heated - correct answer ✔✔Malleability
Materials ability to return to its original shape when load is removed - correct answer ✔✔Elasticity
,Material is said to be _______ if its soft and easily deformed
Doesn't return to original shape - correct answer ✔✔Plasticity
Determines materials ability to withstand sudden impact/hard blow - correct answer ✔✔Toughness
Toughness is also known as - correct answer ✔✔Impact strength
Determines mechanical behaviour of material under static loading conditions - correct answer
✔✔Tention testing
Tension testing provides measurement of _________ & ___________ properties of materials - correct
answer ✔✔elastic and plastic
Ratio of applied load to original cross sectional area - correct answer ✔✔Nominal stress
Nominal strain - correct answer ✔✔Ration of elongation to original length
How is elongation determined in tension test? - correct answer ✔✔By measuring change in distance
between 2 gauge points
Distance between gauge points of unstressed specimen - correct answer ✔✔5cm
What is the slope defined as on a stress/strain diagram - correct answer ✔✔Young's Modulus of
Elasticity
What does Young's Modulus of elasticity measure? - correct answer ✔✔Stress required to cause strain
deformation
When this point is reached, specimen will no longer return to original shape - correct answer ✔✔Yield
Point/Elastic limit
, Stress at yield point is referred to as - correct answer ✔✔Yield strength
Ultimate tensile stress is the _________ ___________ of the material - correct answer ✔✔ultimate
strength
Resistance of a material indentation is the basis for testing... - correct answer ✔✔Hardness
Hardened steel or tungsten ball under specific load pressed into material surface - correct answer
✔✔Brinell Hardness Test
Size of ball and time load applied in Brinell Test - correct answer ✔✔10mm, 10-15sec
What do 40, 500, 10 and 20 represent in the following Brinell Hardness Number
40HB 10/500/20 - correct answer ✔✔40 - BHN obtained
10 - ball diameter
500 - kg load applied
20 - seconds load was applied for
Most used, versatile hardness test - correct answer ✔✔Rockwell Hardness Test
How many loads applied in Rockwell Hardness Test? And what do they do? - correct answer ✔✔1st-
preload removes any effects of surface impurities
2nd- major load, increases depth of indentation
Difference in _________ ________ provides Rockwell hardness number - correct answer ✔✔indentation
depth
Describe B reading Rockwell Test - correct answer ✔✔-Soft material
-1.6mm indent piece
-10kg load
