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Clarification on Definition of Green Strain

  1. Sep 7, 2011 #1
    Hey, everyone. I'm new here. This is a continuum mechanics question. If it's the wrong forum, please let me know, of course.

    The question is pretty simple, but since I haven't been able to find an answer, I'm looking for "crowd help". Green strain [itex]\mathbf{E}[/itex] is usually defined implicitly by the following equation:

    [itex]ds^2-dS^2=2\mathbf{dX}\cdot \mathbf{E}\cdot\mathbf{dX}[/itex]

    For the life of me, I can't explain why the 2 is necessary or where it comes from. I assume there's a good reason, though. Any thoughts are appreciated.
     
  2. jcsd
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