24 Questions
What is the purpose of fatigue strength testing?
To determine the fatigue life of components
Which type of test piece is used in fatigue strength testing?
Test piece with a ball race fitted at one end
What is measured to determine fatigue failure in fatigue strength testing?
Number of cycles completed
Why are aircraft subjected to fatigue tests?
To identify causes of premature fatigue damage
What does an airframe fatigue test provide for design engineers?
Data to develop maintenance programs
In airframe fatigue testing, what is determined to aid in the development of maintenance programs?
Fatigue life of components
What are some of the properties tested for in metallic materials after a heat-treatment process?
Hardness, tensile strength, and fatigue strength
Why is it necessary to test the material after a heat-treatment process?
To verify the desired qualities have been achieved
Which of the following methods is NOT mentioned as a commonly used method for hardness measurement?
Mohs scale
In the Brinell hardness tester, what is used to impress a spherical penetrator into the surface of a sample?
Hydraulic force
How is the hardness value converted in the Brinell method?
Using a special calibrated microscope
Which of the following properties is NOT typically tested in metallic materials after a heat-treatment process?
Electrical conductivity
What does the Rockwell hardness tester measure?
The depth of penetration of the penetrator into the material
How are results displayed in a Rockwell hardness test?
In Rockwell numbers on either a red or a black scale
What does a Brinell hardness tester measure?
The diameter of the impression left by the penetrator
How is tensile strength tested in ferrous metals?
By applying a longitudinal load and plotting load against elongation
In a Rockwell hardness test, what do the Rockwell numbers represent?
Hardness level of the material
How do Rockwell testers differ from Brinell testers in terms of measurement units?
Rockwell testers indicate depth in Rockwell numbers, while Brinell testers indicate diameter
What is the main difference between the Izod and Charpy impact tests?
The beam configuration used
What shape is the specimen in the Charpy V-notch impact test?
Bar of square cross section
What type of configuration does the Izod impact test use?
Cantilevered configuration
What instrument fractures the standard-size notched material in both the Charpy and Izod impact tests?
Pendulum hammer
What happens to the pendulum hammer after it strikes and fractures the specimen at the V-notch in the Charpy V-notch impact test?
Rises to a maximum final height
What is the most common impact testing method used for metals today?
Charpy V-notch impact test
Test your knowledge on the testing of metallic materials after undergoing heat-treatment processes. Explore concepts related to hardness, tensile strength, fatigue strength, and impact resistance in this quiz.
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