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Change of volume in pure torsion

  1. Apr 27, 2016 #1
    why change of volume in pure torsion is zero?
    if you consider stress in plane with degree of 45 there is normal stress
    normal stress can lead to change of volume
     
  2. jcsd
  3. Apr 27, 2016 #2

    Simon Bridge

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    define "pure torsion"...
     
  4. Apr 28, 2016 #3
    Pure torsion appears when exterior forces acting perpendicular to the bar axis
    produce only moments of torsion acting along the bar axis
     
  5. Apr 28, 2016 #4

    Simon Bridge

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    i.e. pure torsion is defined to be the case where the normal stresses are zero.
     
  6. Apr 28, 2016 #5
    See what you get if you evaluate the three principal stresses. Do they sum to zero?
     
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