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Questions and Answers
What does the Rockwell hardness tester measure?
What does the Rockwell hardness tester measure?
How is the depth of penetration represented by the Rockwell hardness tester?
How is the depth of penetration represented by the Rockwell hardness tester?
What does the Brinell hardness tester measure?
What does the Brinell hardness tester measure?
What kind of load is initially applied by the Rockwell hardness tester?
What kind of load is initially applied by the Rockwell hardness tester?
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How is tensile strength of ferrous metal tested?
How is tensile strength of ferrous metal tested?
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What does the Rockwell hardness tester indicate in its test results?
What does the Rockwell hardness tester indicate in its test results?
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What is one of the properties tested for in metallic materials after a heat-treatment process?
What is one of the properties tested for in metallic materials after a heat-treatment process?
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Which hardness testing method uses a hydraulic force to impress a spherical penetrator into the surface of a metal sample?
Which hardness testing method uses a hydraulic force to impress a spherical penetrator into the surface of a metal sample?
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What is typically used to measure the hardness of metals?
What is typically used to measure the hardness of metals?
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Why is it necessary to test metallic materials after a heat-treatment process?
Why is it necessary to test metallic materials after a heat-treatment process?
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Which property is often correlated with the hardness of most metals?
Which property is often correlated with the hardness of most metals?
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How is the Brinell number calculated in the Brinell hardness testing method?
How is the Brinell number calculated in the Brinell hardness testing method?
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What is the purpose of fatigue strength testing?
What is the purpose of fatigue strength testing?
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How is fatigue life determined in fatigue strength testing?
How is fatigue life determined in fatigue strength testing?
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What is a key purpose of airframe fatigue testing for aircraft?
What is a key purpose of airframe fatigue testing for aircraft?
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How are aircraft components benefited from fatigue strength tests?
How are aircraft components benefited from fatigue strength tests?
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In what way does tensile testing differ from fatigue strength testing?
In what way does tensile testing differ from fatigue strength testing?
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Why is it important to conduct airframe fatigue tests on aircraft?
Why is it important to conduct airframe fatigue tests on aircraft?
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What is the main difference between the Izod and Charpy impact tests?
What is the main difference between the Izod and Charpy impact tests?
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Which impact testing method is most commonly used for metals today?
Which impact testing method is most commonly used for metals today?
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What shape is the specimen in the Charpy V-notch impact test?
What shape is the specimen in the Charpy V-notch impact test?
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What type of hammer is used in impact resistance testing?
What type of hammer is used in impact resistance testing?
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What happens to the pendulum in the Charpy V-notch impact test after striking the specimen at the notch?
What happens to the pendulum in the Charpy V-notch impact test after striking the specimen at the notch?
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In the Izod impact test, what type of beam configuration is used?
In the Izod impact test, what type of beam configuration is used?
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Study Notes
Hardness Testing
- The Brinell hardness tester measures the diameter of the impression made by a spherical penetrator on a metal surface, which is then converted to a Brinell number.
- The Rockwell hardness tester measures the depth of penetration of a penetrator into a metal surface, indicated by a Rockwell number on a red or black scale.
Rockwell Hardness Tester
- Uses minor and major loads, with three types of penetrators and three major loads available.
- Provides the same information as the Brinell tester, but measures the depth of penetration instead of the diameter of the impression.
Tensile Strength Testing
- Tests the tensile strength of a ferrous metal by applying a longitudinal load to a sample and plotting the load against the resulting elongations on a graph.
- Provides data on the strength of a metal.
Testing of Metallic Materials
- Testing is carried out with a test piece of the same material and thickness as the component being tested.
- Properties tested for include hardness, tensile strength, fatigue strength, and impact resistance.
Impact Resistance Testing
- The Charpy and Izod impact tests measure the impact resistance (or impact strength) of a metal.
- Both tests involve a pendulum hammer fracturing a notched piece of material with one blow.
- The main difference between the two tests is the beam configuration used.
Charpy V-Notch (CVN) Technique
- A common impact testing method used for metals.
- Involves a specimen with a V-notch, which is struck by a weighted pendulum hammer.
- The pendulum continues its swing, rising to a maximum final height, which is lower than the initial height.
Fatigue Strength Testing
- Establishes the stress level at which structural failure will occur.
- Involves a specially shaped test piece subjected to tension and compression stresses in a rotating machine.
- The number of cycles completed is measured to determine fatigue failure, which is then classified as fatigue life.
Airframe Fatigue Testing
- Aircraft are subjected to fatigue tests to determine the likelihood and causes of premature fatigue damage or wear on the airplane's structure and structural components.
- Provides data for the development of maintenance programs.
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Description
Learn about the testing of metallic materials after heat treatment to ensure desired qualities such as hardness, tensile strength, fatigue strength, and impact resistance. Find out how testing is done using a test piece matching the material and thickness of the component.
