24 Questions
What are some of the properties tested for in metallic materials after a heat-treatment process?
Hardness, Tensile strength, Fatigue strength, Impact resistance
What is the purpose of measuring the hardness of a metal?
To assess the strength of the metal
Which two methods are commonly used for measuring the hardness of metals?
Brinell and Rockwell methods
How is hardness testing typically conducted using a Brinell hardness tester?
Impressing a spherical penetrator into the surface of a sample using hydraulic force
What is measured to determine the Brinell number in hardness testing?
The diameter of the impression left on the sample surface
Why is it necessary for a test piece to consist of the same material and thickness as the component being tested during material testing?
To ensure accurate representation of how the component will perform
What is the purpose of conducting fatigue strength testing on aircraft?
To determine the stress level at which structural failure will occur
How is fatigue life determined in fatigue strength testing?
By counting the number of cycles until fatigue failure occurs
What type of machine is commonly used for airframe fatigue testing?
Wohler Cantilever bending fatigue machine
In fatigue strength testing, what is gripped at one end of the test piece?
A ball race
What does a fatigue test on an F35 Lighting II aim to identify?
Causes of premature fatigue damage or wear
How is the test piece stressed in tension and compression during fatigue strength testing?
By rotating it with an electric motor
What is the main difference between the Brinell and Rockwell hardness testers?
Brinell measures diameter of impression, while Rockwell measures depth of penetration.
How is the depth of penetration indicated in a Rockwell hardness tester?
On either a red or a black scale
What is the purpose of zeroing the Rockwell hardness tester after applying a minor load?
To prepare for applying a major load
How is the Tensile Strength Testing of a ferrous metal conducted?
By applying a longitudinal load and plotting load against resulting elongations
What type of load is initially applied in a Rockwell hardness test?
Minor load
What do Rockwell testers use to measure hardness?
Rockwell numbers on red or black scale
What is the main difference between the Izod impact test and the Charpy impact test?
The beam configuration used
What type of material is commonly used for the specimen in the Charpy V-notch impact test?
Metal
In the Charpy V-notch technique, how does the fracture of the specimen occur?
At the notch due to the pendulum's impact
What type of configuration is used in the Izod impact test?
Cantilevered configuration
What happens to the pendulum after it strikes and fractures the specimen in the Charpy V-notch technique?
Continues its swing to a maximum final height
What instrument is used to fracture a standard-size notched piece of material in both Charpy and Izod impact tests?
Pendulum hammer
Learn about the testing process for metallic materials after heat treatment to ensure the desired qualities have been achieved. Explore properties such as hardness, tensile strength, fatigue strength, and impact resistance. Understand the importance of using a test piece made of the same material and thickness as the component.
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