16 Questions
What is the primary difference between the Charpy and Izod impact test techniques?
The manner of specimen support
What is the formula to calculate the impact strength ($\sigma_{impact}$)?
$\sigma_{impact} = E/A$
What does the ductile-to-brittle transition temperature (DBTT) indicate?
The temperature at which a material behaves in a brittle manner in an impact test
What is the impact energy related to in the ductile-to-brittle transition?
Mode of fracture
What does the appearance of a dull and fibrous surface indicate in the context of fracture surfaces?
Ductile fracture
What factor has an important influence on the impact test result?
Temperature of the specimen
What is the measure of impact energy in the Charpy V-notch (CVN) technique?
$m(h-h̀)$
How does the impact energy change with decreasing temperature during the ductile-to-brittle transition?
It decreases suddenly over a narrow temperature range
What is used to determine whether a material experiences a ductile-to-brittle transition?
Temperature dependence of measured impact energy absorption
What is the primary purpose of using the Charpy V-notch (CVN) technique in impact testing?
To evaluate energy absorption
What does the impact test involve?
Striking a standard specimen with a pendulum and measuring the energy absorbed in breaking the specimen
What does the impact energy value indicate?
The toughness of the material under test
What shape is the specimen used in Charpy and Izod tests?
Bar of square cross-section
What type of notch is machined into the specimen for Charpy and Izod tests?
V-notch with 45° angle and 2-mm depth
Under what conditions can impact test conditions be chosen to represent those most severe relative to the potential for fracture?
Deformation at a relatively low temperature, high strain rate, and triaxial stress state
What are the two standardized tests used to measure impact energy or impact toughness?
Charpy and Izod
Test your knowledge of impact toughness and design against impact in mechanical engineering with this quiz covering topics like impact test, ductile-to-brittle transition, and design against impact. Taught by Dr. Reham Reda Abbas.
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