Metallic Materials Testing

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What are some of the properties tested for in metallic materials after a heat-treatment process?

Hardness, Tensile strength, Fatigue strength, Impact resistance (correct)

Malleability, Toughness, Electrical resistivity, Thermal expansion

Density, Conductivity, Ductility, Corrosion resistance

Elasticity, Brittleness, Creep strength, Shear strength

What is the purpose of measuring the hardness of a metal?

To assess the strength of the metal (correct)

To evaluate the weight of the metal

To measure the electrical conductivity of the metal

To determine the color of the metal

Which two methods are commonly used for measuring the hardness of metals?

Mohs and Vickers methods

Brinell and Rockwell methods (correct)

Barcol and Leeb methods

Knoop and Shore 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 Signup and view all the answers

What is measured to determine the Brinell number in hardness testing?

The diameter of the impression left on the sample surface Signup and view all the answers

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 Signup and view all the answers

What is the purpose of conducting fatigue strength testing on aircraft?

To determine the stress level at which structural failure will occur Signup and view all the answers

How is fatigue life determined in fatigue strength testing?

By counting the number of cycles until fatigue failure occurs Signup and view all the answers

What type of machine is commonly used for airframe fatigue testing?

Wohler Cantilever bending fatigue machine Signup and view all the answers

In fatigue strength testing, what is gripped at one end of the test piece?

A ball race Signup and view all the answers

What does a fatigue test on an F35 Lighting II aim to identify?

Causes of premature fatigue damage or wear Signup and view all the answers

How is the test piece stressed in tension and compression during fatigue strength testing?

By rotating it with an electric motor Signup and view all the answers

What is the main difference between the Brinell and Rockwell hardness testers?

Brinell measures diameter of impression, while Rockwell measures depth of penetration. Signup and view all the answers

How is the depth of penetration indicated in a Rockwell hardness tester?

On either a red or a black scale Signup and view all the answers

What is the purpose of zeroing the Rockwell hardness tester after applying a minor load?

To prepare for applying a major load Signup and view all the answers

How is the Tensile Strength Testing of a ferrous metal conducted?

By applying a longitudinal load and plotting load against resulting elongations Signup and view all the answers

What type of load is initially applied in a Rockwell hardness test?

Minor load Signup and view all the answers

What do Rockwell testers use to measure hardness?

Rockwell numbers on red or black scale Signup and view all the answers

What is the main difference between the Izod impact test and the Charpy impact test?

The beam configuration used Signup and view all the answers

What type of material is commonly used for the specimen in the Charpy V-notch impact test?

Metal Signup and view all the answers

In the Charpy V-notch technique, how does the fracture of the specimen occur?

At the notch due to the pendulum's impact Signup and view all the answers

What type of configuration is used in the Izod impact test?

Cantilevered configuration Signup and view all the answers

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 Signup and view all the answers

What instrument is used to fracture a standard-size notched piece of material in both Charpy and Izod impact tests?

Pendulum hammer Signup and view all the answers

Metallic Materials Testing

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Questions and Answers

What are some of the properties tested for in metallic materials after a heat-treatment process?

What is the purpose of measuring the hardness of a metal?

Which two methods are commonly used for measuring the hardness of metals?

How is hardness testing typically conducted using a Brinell hardness tester?

What is measured to determine the Brinell number in hardness testing?

Why is it necessary for a test piece to consist of the same material and thickness as the component being tested during material testing?

What is the purpose of conducting fatigue strength testing on aircraft?

How is fatigue life determined in fatigue strength testing?

What type of machine is commonly used for airframe fatigue testing?

In fatigue strength testing, what is gripped at one end of the test piece?

What does a fatigue test on an F35 Lighting II aim to identify?

How is the test piece stressed in tension and compression during fatigue strength testing?

What is the main difference between the Brinell and Rockwell hardness testers?

How is the depth of penetration indicated in a Rockwell hardness tester?

What is the purpose of zeroing the Rockwell hardness tester after applying a minor load?

How is the Tensile Strength Testing of a ferrous metal conducted?

What type of load is initially applied in a Rockwell hardness test?

What do Rockwell testers use to measure hardness?

What is the main difference between the Izod impact test and the Charpy impact test?

What type of material is commonly used for the specimen in the Charpy V-notch impact test?

In the Charpy V-notch technique, how does the fracture of the specimen occur?

What type of configuration is used in the Izod impact test?

What happens to the pendulum after it strikes and fractures the specimen in the Charpy V-notch technique?

What instrument is used to fracture a standard-size notched piece of material in both Charpy and Izod impact tests?

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