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5 Written questions

5 Matching questions

  1. in most cases fracture occurs because of the _____ stress component.

    a. compressive
    b. tensile
    c. shear
  2. Three common methods for measurement of ductility:
  3. Plastic deformation occurs when the ______________ within the prosthesis is exceeded.
  4. As the interatomic spacing increases, the internal energy increases. As long as the stress is <b>not greater than the proportional limit</b>, this <u>energy</u> is known as__________.
  5. Why do prostheses sometimes fail under a very small force, even though the strength of the prosthetic material is relatively high?
  1. a Flaws (could be microscopic)
  2. b 1. the <i>percent elongation</i> <b>after</b> fracture.

    2. the <i>reduction in area </i>of the tensile test specimen

    3. the max # of bends performed in a cold bend test.
  3. c resilience

    the term resilience is associated with 'springiness'
  4. d b. tensile
  5. e Plastic deformation occurs when the <b>elastic stress limit (proportional limit)</b> within the prosthesis is exceeded.

5 Multiple choice questions

  1. strength
  2. Because of the reduction in area, the force required to increase deformation actually decreases.

  3. Maximum stress that a structure can withstand without sustaining a specific amount of plastic strain (yield strength) or stress at the point of fracture (ultimate strength).
  4. Ratio of applied force to the actual cross-sectional area; however, for convenience stress is often calculated as the ratio of applied force to the initial cross-sectional area.

  5. Maximum stress at which stress is proportional to strain and above which plastic deformation occurs.

    in this case: PL= 1020 MPa

5 True/False questions

  1. Two important aspects of microscopic flaws in brittle materials:1. tensile stress
    2. shear stress
    3. compressive stress


  2. Elastic modulusRelative stiffness of a material; ratio of elastic stress to elastic strain


  3. fatigue failure
    Repeated stresses resulting in fractures. the fracture due to fatigue occurs at stress levels well below tensile strength.


  4. Name three properties that are related to heardness:1. Compressive strength
    2. proportional limit
    4. ductility


  5. the stress above which stress is no longer proportional to strain.Force per unit area of a material subjected to flexural loading.


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