Mechanical Engineering: Fatigue Failure and Design Quiz
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Questions and Answers

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

  • Cyclic stress (correct)
  • Random stress
  • Compression stress
  • Tensile stress

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

  • Cyclic stress test
  • Fatigue test
  • Compression test
  • Tensile test (correct)

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

  • Permanent deformation failure (correct)
  • Fracture failure
  • Static failure
  • Fatigue failure

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

    <p>Cyclic stress</p> Signup and view all the answers

    What properties are obtained from the fatigue test result?

    <p>S–N Curve</p> 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?

    <p>Fatigue failure</p> Signup and view all the answers

    Under what conditions does fatigue failure typically occur?

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

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

    <p>Tensile stress</p> Signup and view all the answers

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

    <p>Bridges, cars, and airplanes</p> Signup and view all the answers

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

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

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

    <p>Reversed (pure alternating) stress cycle</p> Signup and view all the answers

    What does the repeated (alternating) stress cycle involve?

    <p>Asymmetric maximum and minimum stresses</p> Signup and view all the answers

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

    <p>Reversed (pure alternating) stress cycle</p> Signup and view all the answers

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

    <p>Dynamic loads cause the stress intensity to change constantly and the direction of the stress to vary.</p> 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?

    <p>Cyclic tests</p> Signup and view all the answers

    What is the primary focus of fatigue life improvement techniques?

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

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

    <p>Fatigue failure</p> Signup and view all the answers

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

    <p>Cyclic stresses</p> Signup and view all the answers

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

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

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

    <p>Tensile stress only</p> Signup and view all the answers

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

    <p>Brittle-like with very little gross plastic deformation</p> Signup and view all the answers

    Under what conditions does fatigue failure typically occur?

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

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

    <p>Fatigue failure</p> Signup and view all the answers

    What properties are obtained from the fatigue test result?

    <p>Fatigue strength and fatigue life</p> Signup and view all the answers

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

    <p>Reversed (pure alternating) stress cycle only</p> Signup and view all the answers

    What does the repeated (alternating) stress cycle involve?

    <p>Asymmetric maximum and minimum stresses</p> Signup and view all the answers

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

    <p>Fluctuating stress</p> Signup and view all the answers

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