Mechanical Engineering Fourth Year: Fatigue Failure and Design Against Fatigue Chapter 4 Quiz

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What is the primary cause of fatigue failure in materials?

Gross plastic deformation

High tensile strength

Repeated loading and unloading (correct)

Static load exceeding the material's strength

Which type of stress is required for fatigue failure to occur?

Part of the stress has to be tensile (correct)

Pure compressive stress

Symmetrical stress about a mean zero stress level

Asymmetric stress with maximum and minimum stresses

When does fatigue failure typically occur?

At low loads causing gross plastic deformation

After a lengthy period of repeated stress or strain cycling (correct)

At high loads exceeding the yield strength

During sudden and expected events

What type of stress cycle has symmetrical amplitude about a mean zero stress level?

Reversed (pure alternating) stress cycle Signup and view all the answers

What is the nature of fatigue failure?

Catastrophic and insidious Signup and view all the answers

Where is fatigue failure commonly observed?

In load-bearing components/structures, cars, and airplanes Signup and view all the answers

What type of stress cycle has asymmetric maximum and minimum stresses?

Repeated (alternating) stress cycle Signup and view all the answers

What type of machine components are susceptible to fatigue failure?

Crankshafts, drive shafts, gears, and springs Signup and view all the answers

What is the nature of fatigue failure even in normally ductile metals?

Brittle with no gross plastic deformation during failure Signup and view all the answers

In which type of consumer products can fatigue failure occur?

Shoes subjected to repetitive stresses Signup and view all the answers

What type of stress is experienced by components subjected to dynamic loads?

Cyclic stress Signup and view all the answers

What are the fatigue properties obtained from the fatigue test?

The S–N Curve and Strength Areas Signup and view all the answers

What type of failure is particularly relevant for components subjected to dynamic loads?

Fatigue failure Signup and view all the answers

What type of components are typically designed to withstand dynamic loads without permanent deformation?

Statically loaded components Signup and view all the answers

What kind of test provides useful values for material selection and component dimensioning for statically loaded components?

Tensile, compression, and bending tests Signup and view all the answers

What type of stress increases slowly but steadily until the load finally fractures the specimen in tensile, compression, and bending tests?

Static stress Signup and view all the answers

What type of stress cycle has symmetrical amplitude about a mean zero stress level?

Reversed (pure alternating) stress cycle Signup and view all the answers

What type of failure is particularly relevant for components subjected to dynamic loads?

Fatigue failure Signup and view all the answers

What is the nature of fatigue failure even in normally ductile metals?

Brittle in nature Signup and view all the answers

What kind of test provides useful values for material selection and component dimensioning for statically loaded components?

Tensile test Signup and view all the answers

What type of components are typically designed to withstand dynamic loads without permanent deformation?

Elastic components Signup and view all the answers

What are the fatigue properties obtained from the fatigue test?

Fatigue limit and endurance limit Signup and view all the answers

What type of stress increases slowly but steadily until the load finally fractures the specimen in tensile, compression, and bending tests?

Static stress Signup and view all the answers

What is the primary cause of fatigue failure in materials?

Repeated loading and unloading Signup and view all the answers

When does fatigue failure typically occur?

At low loads lower than the tensile or yield strength for a static load Signup and view all the answers

In which type of consumer products can fatigue failure occur?

Products subjected to repetitive stresses below the yield strength Signup and view all the answers

Which type of stress can be cyclic or random when components are subjected to dynamic loads?

Dynamic stress Signup and view all the answers

What type of failure is particularly relevant for components subjected to dynamic loads?

Fatigue failure Signup and view all the answers

In which tests does the intensity of the stress increase slowly but steadily until the load finally fractures the specimen?

Bending tests Signup and view all the answers

Mechanical Engineering Fourth Year: Fatigue Failure and Design Against Fatigue Chapter 4 Quiz

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Questions and Answers

What is the primary cause of fatigue failure in materials?

Which type of stress is required for fatigue failure to occur?

When does fatigue failure typically occur?

What type of stress cycle has symmetrical amplitude about a mean zero stress level?

What is the nature of fatigue failure?

Where is fatigue failure commonly observed?

What type of stress cycle has asymmetric maximum and minimum stresses?

What type of machine components are susceptible to fatigue failure?

What is the nature of fatigue failure even in normally ductile metals?

In which type of consumer products can fatigue failure occur?

What type of stress is experienced by components subjected to dynamic loads?

What are the fatigue properties obtained from the fatigue test?

What type of failure is particularly relevant for components subjected to dynamic loads?

What type of components are typically designed to withstand dynamic loads without permanent deformation?

What kind of test provides useful values for material selection and component dimensioning for statically loaded components?

What type of stress increases slowly but steadily until the load finally fractures the specimen in tensile, compression, and bending tests?

What type of stress cycle has symmetrical amplitude about a mean zero stress level?

What type of failure is particularly relevant for components subjected to dynamic loads?

What is the nature of fatigue failure even in normally ductile metals?

What kind of test provides useful values for material selection and component dimensioning for statically loaded components?

What type of components are typically designed to withstand dynamic loads without permanent deformation?

What are the fatigue properties obtained from the fatigue test?

What type of stress increases slowly but steadily until the load finally fractures the specimen in tensile, compression, and bending tests?

What is the primary cause of fatigue failure in materials?

When does fatigue failure typically occur?

In which type of consumer products can fatigue failure occur?

Which type of stress can be cyclic or random when components are subjected to dynamic loads?

What type of failure is particularly relevant for components subjected to dynamic loads?

In which tests does the intensity of the stress increase slowly but steadily until the load finally fractures the specimen?

Which type of machine components are particularly susceptible to fatigue failure?

What type of stress cycle has asymmetric maximum and minimum stresses?

What is the primary cause of fatigue failure in materials?

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