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Structural Failure Examination and Analysis

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Structural Failure Examination and Analysis

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Questions and Answers

What is the purpose of step 2 in the failure investigation process?

To select samples and prepare them

To analyze the phases and inclusions

To visually examine the damage

To photograph the failure before destruction for examination (correct)

What does metallographic examination reveal?

Fracture modes and crack initiation

Chemical analysis

Depth of hardening and grain size (correct)

Microanalysis using energy dispersive X-ray spectroscopy

What is the purpose of microanalysis using energy dispersive X-ray spectroscopy (SEM/EDX)?

To reveal depth of hardening and grain size

To analyze the phases and inclusions (correct)

To visually examine the damage

To select samples and prepare them

What does NDT stand for in step 5 of the failure investigation process?

Non-destructive testing Signup and view all the answers

What can be used to evaluate the magnitude of stress in the loading situation?

Metallographic examination Signup and view all the answers

Which of the following can lead to a decrease in strength at high temperature?

Quenched and tempered materials Signup and view all the answers

What is the key aspect of correct design mentioned in the text?

Designing for maximum stress including safety factor Signup and view all the answers

Under what condition does elastic deformation occur in a material?

When subjected to a load exceeding yield strength Signup and view all the answers

What type of material processing may create gas porosity and segregation?

Casting Signup and view all the answers

What can prevent failure due to elastic deformation with unanticipated temperature changes?

Selecting a material with a sufficiently high modulus Signup and view all the answers

Which type of material processing can create cracks, flaws, and distortion?

Cold working and forging Signup and view all the answers

What property of a material is affected by a change in temperature, leading to elastic deformation at smaller loads?

Modulus Signup and view all the answers

What can cause a material to fail without being permanently changed?

Elastic deformation exceeding yield strength Signup and view all the answers

What type of material processing can create gas porosity and cracks?

Welding Signup and view all the answers