Chapter Eight Quiz Flashcards
In carrying out the Charpy V-notch test, why is the specimen loaded into the anvil with a pair of special tongs?
Facilitate location of specimen in the machine.
Transition temperature or transition range temperature refers to impact testing of welds and materials. If the transition temperature for a given weld is minus 20 ᵒC, this means:
Weld cannot perform well below this temperature.
What is the nick break test used for?
Revealing internal weld defects.
N/mm2 is equal to?
Mpa
What is elongation?
Measure of ductility of the material.
Plastic deformation happens before the yield point?
No
In the Charpy test, if the pendulum swings through the specimen almost to its original height, what does this indicate?
Brittle and has absorbed little energy.
With regards to tensile testing, when the stress rises to a maximum value it is known as?
UTS ultimate tensile strength
A proof test on a pressure vessel is usually performed using which medium?
Water
What would happen if a sufficiently high stress, beyond the elastic limit, is applied to a metal bar?
Bar will not return to original length and contain permanent set.
What happens to the notch in the Charpy specimen when it is struck by the pendulum?
Goes into tension causing initiation of the fracture from the notch.
What other terms do we use for permanent deformation?
Permanent set
What are the three ways in which a load can act on a cross-sectional area in a body?
Tension, compression, and shear/torsion.
A major advantage of the CTOD fracture mechanics test is?
Help assess significance of flaws within a structure.
What is another name for the most common proof test method performed on pressure vessels?
Hydrostatic testing.
When using the fatigue test method, how many tests are usually necessary to get good data?
Several tests are required to produce sufficient data points.
When we pull a sample in the tensile testing machine, the surface has tension stresses acting on it but also has shear stresses acting on it as well.
yes
CSA W47.1 uses the fillet weld break test to:
Reveal defects such as porosity, penetration or other criteria which would determine whether the test has been passed.
When conducting impact tests on welds:
Important the notch is oriented correctly.
What is creep testing?
High temp progressive deformation at constant stress.
The strain in a body is a measurement of:
Change in dimension due to the application of an applied load.
What is an extensometer used for in a tensile test?
Measure strain during the test. Taken off after yield point to prevent damage.
Fatigue failure occurs under:
Repeating or fluctuating loads.
In the tensile test of a metal, what does the term necking mean?
Deformation of test specimen that occurs when the UTS is exceeded.
