25 Questions
What test is typically used to determine the strength, elastic, and ductility properties of materials?
Tensile test
What is measured and recorded continuously during a tensile test?
Change in length (strain)
What is considered the ultimate tensile strength (su) during a tensile test?
Peak apparent stress on the test bar
How is stress related to the applied force during a tensile test?
Stress is directly proportional to the applied force
What happens to the stress–strain curve after the peak of the ultimate tensile strength?
It drops off
Which type of metal property is sometimes called the ultimate strength or simply the tensile strength?
Ultimate tensile strength
What method is used to measure Poisson’s ratio, Young’s modulus, and shear modulus of material?
Ultrasonic pulse-echo technique
Which testing fixtures are typically used for ASTM D790 and ISO 178 standards?
3-point bending fixtures
What does the Brinell hardness tester employ as the penetrator for steels?
Hardened steel ball
For which materials does the Rockwell hardness tester use a diamond penetrator?
Heat-treated alloy steels
What is machinability related to?
Ease of machining
What is toughness related to in materials?
Impact resistance
What is the modulus of elasticity?
The slope of the straight-line portion of the stress–strain diagram
What is Poisson’s ratio?
The ratio of shortening strain to tensile strain
What indicates a material's stiffness under shear loading?
The ultimate strength in shear
What is the measure of a material's ductility?
The percent elongation
What represents the resistance to shear deformation?
The modulus of elasticity in shear (G)
What is the apparent stress computed by when creating stress–strain diagrams?
Dividing the load by the original cross-sectional area
What property of a material is indicated by its ability to transfer heat?
Thermal conductivity
What is the measure of the change in length of a material subjected to a change in temperature?
Coefficient of thermal expansion
What phenomenon occurs when a material under stress experiences progressive elongation over time at high temperatures?
Creep
What is the property defined as the mass per unit volume of a material?
Density
Which property is used to indicate the weight per unit volume of a material?
Density
What property should be considered for metals operating at high temperatures?
Creep
At what temperature should creep be checked for a loaded metal member?
$0.3Tm$
Learn about a method that uses ultrasonic pulse-echo technique to measure the velocity of sound in a material, along with a thickness measuring device, in order to determine Poisson’s ratio, Young’s modulus, and shear modulus. This method is particularly useful for materials like plastics.
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