Podcast
Questions and Answers
What is the purpose of the impact test?
What is the purpose of the impact test?
- To measure the tensile strength of the material
- To measure the energy absorbed in breaking the specimen (correct)
- To assess the elasticity of the material
- To determine the hardness of the material
What do the Charpy and Izod tests measure?
What do the Charpy and Izod tests measure?
- Impact energy or impact toughness (correct)
- Tensile strength of the material
- Elasticity of the material
- Hardness of the material
What shape is the specimen for both Charpy and Izod tests?
What shape is the specimen for both Charpy and Izod tests?
- Bar of square cross-section with a V-notch (correct)
- Spherical
- Cylindrical
- Rectangular
Under what conditions can impact test conditions be chosen?
Under what conditions can impact test conditions be chosen?
What does the energy value from an impact test indicate?
What does the energy value from an impact test indicate?
What does the V-notch in the specimen for Charpy and Izod tests help to measure?
What does the V-notch in the specimen for Charpy and Izod tests help to measure?
Which impact test uses a weighted pendulum hammer to apply an impact blow at a fixed height?
Which impact test uses a weighted pendulum hammer to apply an impact blow at a fixed height?
What is the primary difference between the Charpy and Izod techniques?
What is the primary difference between the Charpy and Izod techniques?
What is the measure of impact energy calculated from the difference between h and h̀?
What is the measure of impact energy calculated from the difference between h and h̀?
What is the ductile-to-brittle transition temperature (DBTT)?
What is the ductile-to-brittle transition temperature (DBTT)?
At what temperature does the impact energy drop suddenly over a relatively narrow range?
At what temperature does the impact energy drop suddenly over a relatively narrow range?
What is indicated by the appearance of a dull and fibrous fracture surface?
What is indicated by the appearance of a dull and fibrous fracture surface?
What does the Charpy V-notch (CVN) technique measure?
What does the Charpy V-notch (CVN) technique measure?
What factor does the ductile-to-brittle transition temperature (DBTT) depend on?
What factor does the ductile-to-brittle transition temperature (DBTT) depend on?
What is the mode of fracture at higher temperatures according to the text?
What is the mode of fracture at higher temperatures according to the text?
What is used to strike and fracture the specimen at the notch in the Charpy V-notch (CVN) technique?
What is used to strike and fracture the specimen at the notch in the Charpy V-notch (CVN) technique?
The primary difference between the Charpy and Izod techniques lies in the manner of specimen support.
The primary difference between the Charpy and Izod techniques lies in the manner of specimen support.
The energy absorption computed from the impact-testing apparatus is a measure of the impact toughness.
The energy absorption computed from the impact-testing apparatus is a measure of the impact toughness.
One of the important uses of the impact test is to determine whether a material experiences a ductile-to-brittle transition with decreasing temperature.
One of the important uses of the impact test is to determine whether a material experiences a ductile-to-brittle transition with decreasing temperature.
The ductile-to-brittle transition temperature (DBTT) depends only on the strain rate.
The ductile-to-brittle transition temperature (DBTT) depends only on the strain rate.
The temperature of the specimen has no influence on the test result and the fracture mode.
The temperature of the specimen has no influence on the test result and the fracture mode.
As the temperature is lowered, the impact energy increases steadily.
As the temperature is lowered, the impact energy increases steadily.
The appearance of fracture surface is not an indication for the nature of fracture and is not used in transition temperature determination.
The appearance of fracture surface is not an indication for the nature of fracture and is not used in transition temperature determination.
For ductile fracture, the surface appears shiny and smooth.
For ductile fracture, the surface appears shiny and smooth.
The Charpy V-notch (CVN) technique measures impact strength in Joules per meter square.
The Charpy V-notch (CVN) technique measures impact strength in Joules per meter square.
Izod technique uses a weighted pendulum hammer to apply an impact blow at a fixed height.
Izod technique uses a weighted pendulum hammer to apply an impact blow at a fixed height.
The impact test involves striking a standard specimen with a pendulum and measuring the energy absorbed in breaking the specimen.
The impact test involves striking a standard specimen with a pendulum and measuring the energy absorbed in breaking the specimen.
The impact energy value indicates the ductility of the material under test.
The impact energy value indicates the ductility of the material under test.
Charpy and Izod are the names of two standardized tests used to measure impact energy or impact toughness.
Charpy and Izod are the names of two standardized tests used to measure impact energy or impact toughness.
The specimen for both Charpy and Izod tests is in the shape of a bar with a circular cross-section.
The specimen for both Charpy and Izod tests is in the shape of a bar with a circular cross-section.
Deformation at a relatively high temperature is one of the standardized test conditions for representing severe potential for fracture in an impact test.
Deformation at a relatively high temperature is one of the standardized test conditions for representing severe potential for fracture in an impact test.
The Izod test uses a V-notch with 90° depth machined into the specimen.
The Izod test uses a V-notch with 90° depth machined into the specimen.
