Mechanical Engineering: Fatigue Failure and Design Quiz

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

Cyclic stress

Which test provides useful values for material selection and component dimensioning for statically loaded components?

Tensile test

What type of failure is caused by the applied load on the material in service application?

Permanent deformation failure

What type of stress changes constantly in components subjected to dynamic loads?

Cyclic stress Signup and view all the answers

What properties are obtained from the fatigue test result?

S–N Curve Signup and view all the answers

What is the phenomenon known as when a material fails due to repeated loading and unloading, even at low loads?

Fatigue failure Signup and view all the answers

Under what conditions does fatigue failure typically occur?

After a lengthy period of repeated stress or strain cycling Signup and view all the answers

What type of stress is necessary for fatigue to occur in a material?

Tensile stress Signup and view all the answers

In which components/structures is fatigue failure a common phenomenon?

Bridges, cars, and airplanes Signup and view all the answers

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

It results in no gross plastic deformation associated with failure Signup and view all the answers

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

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

What does the repeated (alternating) stress cycle involve?

Asymmetric maximum and minimum stresses Signup and view all the answers

In which type of stress cycle do the maximum and minimum stresses have equal magnitude?

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

Which of the following is a distinguishing feature of dynamic loads as compared to static loads?

Dynamic loads cause the stress intensity to change constantly and the direction of the stress to vary. Signup and view all the answers

In which type of fatigue tests does the stress intensity change constantly and the direction of the stress vary?

Cyclic tests Signup and view all the answers

What is the primary focus of fatigue life improvement techniques?

To extend the duration before fatigue failure occurs in a material under dynamic loading Signup and view all the answers

Which type of failure mechanism is commonly associated with components subjected to dynamic loads?

Fatigue failure Signup and view all the answers

What type of stresses are necessary for fatigue life improvement techniques to be most relevant?

Cyclic stresses Signup and view all the answers

What distinguishes fatigue failure from failure in application due to permanent deformation?

Fatigue failure involves cyclic stresses, while permanent deformation involves constant stresses. Signup and view all the answers

What type of stress is necessary for fatigue to occur in a material?

Tensile stress only Signup and view all the answers

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

Brittle-like with very little gross plastic deformation Signup and view all the answers

Under what conditions does fatigue failure typically occur?

After a lengthy period of repeated stress or strain cycling Signup and view all the answers

What type of failure is caused by the applied load on the material in service application?

Fatigue failure Signup and view all the answers

What properties are obtained from the fatigue test result?

Fatigue strength and fatigue life Signup and view all the answers

In which type of stress cycle do the maximum and minimum stresses have equal magnitude?

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

What does the repeated (alternating) stress cycle involve?

Asymmetric maximum and minimum stresses Signup and view all the answers

What type of stress changes constantly in components subjected to dynamic loads?

Fluctuating stress Signup and view all the answers

Mechanical Engineering: Fatigue Failure and Design Quiz

Questions and Answers

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

Which test provides useful values for material selection and component dimensioning for statically loaded components?

What type of failure is caused by the applied load on the material in service application?

What type of stress changes constantly in components subjected to dynamic loads?

What properties are obtained from the fatigue test result?

What is the phenomenon known as when a material fails due to repeated loading and unloading, even at low loads?

Under what conditions does fatigue failure typically occur?

What type of stress is necessary for fatigue to occur in a material?

In which components/structures is fatigue failure a common phenomenon?

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

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

What does the repeated (alternating) stress cycle involve?

In which type of stress cycle do the maximum and minimum stresses have equal magnitude?

Which of the following is a distinguishing feature of dynamic loads as compared to static loads?

In which type of fatigue tests does the stress intensity change constantly and the direction of the stress vary?

What is the primary focus of fatigue life improvement techniques?

Which type of failure mechanism is commonly associated with components subjected to dynamic loads?

What type of stresses are necessary for fatigue life improvement techniques to be most relevant?

What distinguishes fatigue failure from failure in application due to permanent deformation?

What type of stress is necessary for fatigue to occur in a material?

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

Under what conditions does fatigue failure typically occur?

What type of failure is caused by the applied load on the material in service application?

What properties are obtained from the fatigue test result?

In which type of stress cycle do the maximum and minimum stresses have equal magnitude?

What does the repeated (alternating) stress cycle involve?

What type of stress changes constantly in components subjected to dynamic loads?

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