Mechanical Engineering: Fatigue Failure and Design Quiz
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Questions and Answers

Which type of stress changes constantly in dynamic load applications?

  • Intensity of the stress
  • Magnitude of the stress
  • Direction of the stress (correct)
  • Frequency of the stress
  • What type of stress can be cyclic or random in dynamic load applications?

  • Compressive stress
  • Dynamic stress (correct)
  • Bending stress
  • Tensile stress
  • Which parameter values are useful for material selection and component dimensioning in statically loaded components?

  • Cyclic stress values
  • Strength parameters from fatigue tests (correct)
  • Dynamic load values
  • Stress intensity values
  • What must components be designed to prevent in many applications?

    <p>Permanent deformation</p> Signup and view all the answers

    In fatigue failure, what changes constantly along with the stress intensity?

    <p>Direction of the stress</p> Signup and view all the answers

    What is the main cause of fatigue failure in materials subjected to repeated loading and unloading?

    <p>The formation of small cracks that grow as a result of repeated stresses</p> Signup and view all the answers

    In which type of stress cycle does the amplitude alternate from a maximum tensile stress to a minimum compressive stress of equal magnitude?

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

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

    <p>Brittle, with minimal gross plastic deformation</p> Signup and view all the answers

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

    <p>Partially tensile stress</p> Signup and view all the answers

    Where is fatigue failure most commonly observed?

    <p>In load-bearing components, bridges, cars, and airplanes</p> Signup and view all the answers

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