Metallic Materials Testing Quiz

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What is the purpose of fatigue strength testing?

To determine the fatigue life of components (correct)

To establish the stress level at which structural failure will occur

To measure the compressive strength of materials

To measure the tensile strength of materials

Which type of test piece is used in fatigue strength testing?

Test piece with a ball race fitted at one end (correct)

Test piece with a flat plate shape

Round test piece with a smooth surface

Specially shaped test piece with a square cross-section

What is measured to determine fatigue failure in fatigue strength testing?

Number of revolutions completed

Number of cycles completed (correct)

Amount of tension and compression applied

Duration of the test

Why are aircraft subjected to fatigue tests?

To identify causes of premature fatigue damage Signup and view all the answers

What does an airframe fatigue test provide for design engineers?

Data to develop maintenance programs Signup and view all the answers

In airframe fatigue testing, what is determined to aid in the development of maintenance programs?

Fatigue life of components Signup and view all the answers

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

Hardness, tensile strength, and fatigue strength Signup and view all the answers

Why is it necessary to test the material after a heat-treatment process?

To verify the desired qualities have been achieved Signup and view all the answers

Which of the following methods is NOT mentioned as a commonly used method for hardness measurement?

Mohs scale Signup and view all the answers

In the Brinell hardness tester, what is used to impress a spherical penetrator into the surface of a sample?

Hydraulic force Signup and view all the answers

How is the hardness value converted in the Brinell method?

Using a special calibrated microscope Signup and view all the answers

Which of the following properties is NOT typically tested in metallic materials after a heat-treatment process?

Electrical conductivity Signup and view all the answers

What does the Rockwell hardness tester measure?

The depth of penetration of the penetrator into the material Signup and view all the answers

How are results displayed in a Rockwell hardness test?

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

What does a Brinell hardness tester measure?

The diameter of the impression left by the penetrator Signup and view all the answers

How is tensile strength tested in ferrous metals?

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

In a Rockwell hardness test, what do the Rockwell numbers represent?

Hardness level of the material Signup and view all the answers

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 Signup and view all the answers

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

The beam configuration used Signup and view all the answers

What shape is the specimen in the Charpy V-notch impact test?

Bar of square cross section Signup and view all the answers

What type of configuration does the Izod impact test use?

Cantilevered configuration Signup and view all the answers

What instrument fractures the standard-size notched material in both the Charpy and Izod impact tests?

Pendulum hammer Signup and view all the answers

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 Signup and view all the answers

What is the most common impact testing method used for metals today?

Charpy V-notch impact test Signup and view all the answers