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Shear stress acting on an element

  1. Oct 14, 2016 #1
    1. The problem statement, all variables and given/known data
    When an element of material is subjected to pure shear stress , equlibrium requires that equal shear stress must be developed on four faces of an element .

    2. Relevant equations


    3. The attempt at a solution
    I cant understand the statement . I assume the 'element ' is cubic ... When the element is subjected to pure shear stress , equal shear stress must be developed on all six surfaces of element , right ?
     
  2. jcsd
  3. Oct 15, 2016 #2
    is there anything wrong with the notes ?
     
  4. Oct 18, 2016 #3

    Mapes

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    Pure shear stress involves only four planes; e.g., a shear stress ##\tau_{xy}## implies that there is traction on the planes with positive- and negative-facing normal vectors in the ##x## and ##y## directions. There's no normal or shear force applied to the remaining two planes (in this case, the planes with positive- and negative-facing normal vectors in the ##z## direction).
     
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