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5 Written questions

5 Matching questions

  1. Proportional limit
  2. Percent elongation
  3. Stress concentration
  4. Flexural strength
  5. Brittleness
  1. a
    Area or point of significantly higher stress associated with a structural discontinuity such as a crack or pore or a marked change in dimension of a structure.
  2. b Relative inability of material to deform plastically
  3. c Maximum amount of plastic strain a tensile test specimen can sustain before it fractures (See Ductility).
  4. d
    Maximum stress at which stress is proportional to strain and above which plastic deformation occurs.

    in this case: PL= 1020 MPa
  5. e
    Force per unit area at the point of fracture of a test specimen subjected to flexural loading.

5 Multiple choice questions

  1. b. tensile
  2. Stress and/or strain

  3. Stress = Force / area

    stress units - MPa

  4. 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).
  5. 38%

5 True/False questions

  1. Plastic deformation occurs when the ______________ within the prosthesis is exceeded.Plastic deformation occurs when the <b>elastic stress limit (proportional limit)</b> within the prosthesis is exceeded.

          

  2. Three common methods for measurement of ductility:1. tensile stress
    2. shear stress
    3. compressive stress

          

  3. Shear stress
    • The <b>stress</b> at which a test specimen exhibits a specific amount of plastic strain (0.2%)

    • The YS at 0.2% strain offset from the origin is 1536 MPa in this case.

          

  4. Why do prostheses sometimes fail under a very small force, even though the strength of the prosthetic material is relatively high?Flaws (could be microscopic)

          

  5. Yield strength
    • The <b>stress</b> at which a test specimen exhibits a specific amount of plastic strain (0.2%)

    • The YS at 0.2% strain offset from the origin is 1536 MPa in this case.