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Defomation mechanics homework

  1. Sep 15, 2009 #1
    1. The problem statement, all variables and given/known data

    What does it mean when a measure of defomation is 'not invariant with respect to large rotations of the body as rigid'?
    i found that a measure of deformation is a 3x3 matrix:
    cos(a),0,0
    0,cos(a),0
    0,0,0
    where a is a constant
    so why does this prove that this measure is 'not invariant with respect to large rotations of the body as rigid'?

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 16, 2009 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi sara_87! :smile:

    I think it means that the deformation is only in the x and y directions, so if for example you swap round the x and z directions, the matrix will be different.
     
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