Mechanical Engineering Fourth Year Impact Toughness Chapter 3
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Questions and Answers

What is the primary difference between the Charpy and Izod impact test techniques?

  • The type of pendulum used
  • The manner of specimen support (correct)
  • The temperature of the impact test
  • The material of the specimen

    • What is the formula to calculate the impact strength ($\sigma_{impact}$)?

  • $\sigma_{impact} = mh/h̀$
  • $\sigma_{impact} = E/Ah$
  • $\sigma_{impact} = E/mh$
  • $\sigma_{impact} = E/A$ (correct)

    • What does the ductile-to-brittle transition temperature (DBTT) indicate?

  • The temperature at which a material experiences maximum brittleness
  • The temperature at which a material behaves in a brittle manner in an impact test (correct)
  • The temperature at which a material experiences maximum ductility
  • The temperature at which a material behaves in a ductile manner in an impact test

    • What is the impact energy related to in the ductile-to-brittle transition?

    <p>Mode of fracture</p> Signup and view all the answers

    What does the appearance of a dull and fibrous surface indicate in the context of fracture surfaces?

    <p>Ductile fracture</p> Signup and view all the answers

    What factor has an important influence on the impact test result?

    <p>Temperature of the specimen</p> Signup and view all the answers

    What is the measure of impact energy in the Charpy V-notch (CVN) technique?

    <p>$m(h-h̀)$</p> Signup and view all the answers

    How does the impact energy change with decreasing temperature during the ductile-to-brittle transition?

    <p>It decreases suddenly over a narrow temperature range</p> Signup and view all the answers

    What is used to determine whether a material experiences a ductile-to-brittle transition?

    <p>Temperature dependence of measured impact energy absorption</p> Signup and view all the answers

    What is the primary purpose of using the Charpy V-notch (CVN) technique in impact testing?

    <p>To evaluate energy absorption</p> Signup and view all the answers

    What does the impact test involve?

    <p>Striking a standard specimen with a pendulum and measuring the energy absorbed in breaking the specimen</p> Signup and view all the answers

    What does the impact energy value indicate?

    <p>The toughness of the material under test</p> Signup and view all the answers

    What shape is the specimen used in Charpy and Izod tests?

    <p>Bar of square cross-section</p> Signup and view all the answers

    What type of notch is machined into the specimen for Charpy and Izod tests?

    <p>V-notch with 45° angle and 2-mm depth</p> Signup and view all the answers

    Under what conditions can impact test conditions be chosen to represent those most severe relative to the potential for fracture?

    <p>Deformation at a relatively low temperature, high strain rate, and triaxial stress state</p> Signup and view all the answers

    What are the two standardized tests used to measure impact energy or impact toughness?

    <p>Charpy and Izod</p> Signup and view all the answers

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