Composite Toughness and Charpy Test Quiz
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Questions and Answers

What type of test is the Charpy test for composite toughness?

  • Compression test
  • Impact test (correct)
  • Tensile test
  • Shear test
  • What happens to the fracture energies in the Charpy test compared to quasi-static tests?

  • They are the same
  • They are lower
  • They are unpredictable
  • They are higher (correct)
  • What happens to the fracture energy for most composite materials as crack length increases?

  • It decreases linearly
  • It increases until a limit length and then stops (correct)
  • It remains constant
  • It increases linearly
  • What happens to the fracture energy for uniaxial plies as the loading angle increases?

    <p>It sharply decreases</p> Signup and view all the answers

    Under what conditions does a crack remain stable if the energy absorbed by it is lower than its critical value Gc?

    <p>Both fatigue loading and corrosion-stress</p> Signup and view all the answers

    What is the impact of failure strain of the matrix on fatigue handling in thermoset composites?

    <p>It reduces stress intensity at crack tips via load redistribution</p> Signup and view all the answers

    What effect does cycling frequency have on fatigue strength in composites?

    <p>Fast deformations cause localized heating, decreasing matrix toughness</p> Signup and view all the answers

    Which type of materials have the most stable thermal behavior?

    <p>Ceramics</p> Signup and view all the answers

    What is the impact of boiling glass-epoxy composites on fatigue resistance?

    <p>It increases resistance to fatigue</p> Signup and view all the answers

    How do materials with higher α behave in terms of thermal expansion?

    <p>They have more variation in thermal expansion with temperature</p> Signup and view all the answers

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