Mechanical Engineering Ch (4) Fatigue Failure and Design Quiz
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Questions and Answers

What is the main cause of fatigue failure in materials?

  • Repeated loading and unloading (correct)
  • Lack of proper maintenance
  • Static load beyond material capacity
  • Excessive tensile or yield strength
  • When does fatigue failure typically occur?

  • After a lengthy period of repeated stress or strain cycling (correct)
  • Immediately upon the application of stress
  • Only under static load
  • At high loads above the material's tensile strength
  • In what way is fatigue failure different from static failure?

  • Fatigue failure occurs without warning (correct)
  • Fatigue failure is always ductile in nature
  • Static failure involves gross plastic deformation
  • Static failure occurs after repeated stress cycling
  • What type of stress is necessary for fatigue to occur in a material?

    <p>At least part of the stress has to be tensile</p> Signup and view all the answers

    In what kind of components/structures is fatigue failure a common phenomenon?

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

    What is the nature of fatigue failure in materials?

    <p>Catastrophic and insidious</p> Signup and view all the answers

    Which fluctuating stress-time mode accounts for fatigue failures with symmetrical amplitude about a mean zero stress level?

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

    What is the term for the type of stress cycle where maximum and minimum stresses are asymmetric?

    <p>&quot;Repeated (alternating) stress cycle&quot;</p> Signup and view all the answers

    What is the term for a material failure caused by the initiation and propagation of cracks due to repeated loading and unloading?

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

    "Fatigue in rotated shaft carries a pulley while rotating" is an example of what kind of fatigue?

    <p>Torsional fatigue</p> Signup and view all the answers

    What type of stress can be cyclic or random in dynamic loads?

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

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

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

    What is the name of the test result that represents the relationship between stress amplitude and the number of cycles to failure?

    <p>S–N curve</p> Signup and view all the answers

    In which type of application must components be designed to avoid permanent deformation?

    <p>Service application</p> Signup and view all the answers

    What does the intensity of stress do in tensile, compression, and bending tests until the load finally fractures the specimen?

    <p>Increases slowly but steadily</p> Signup and view all the answers

    Which factor affects fatigue properties by causing microscopic voids in the material?

    <p>Stress amplitude</p> Signup and view all the answers

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