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Solid Mechanics questions - A new challenge

  1. Nov 20, 2009 #1
    Solid Mechanics questions - A new challenge :)

    Hi all :wink:

    I got 3 new questions that need to be solved in about 3-4 days as part of a 'challenge' homework. Those who solve correctly will basically get their names read out loud on the next lecture but I do it to understand the material of the course

    First Question:

    http://up185.siz.co.il/up3/n2i5uwddmczo.jpg [Broken]

    I first tried to write all that I think that has to do with the questions, expressions that I learned and think that I'll use.
    Then I thought of first expressing E1111 but then I figured there's no need to.
    How do I express E'1111 ? do I use the last formula (transition formula) first?
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Nov 22, 2009 #2

    Mapes

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    Re: Solid Mechanics questions - A new challenge :)

    The solution doesn't involve any sines or cosines (or trigonometry at all). It's hard to say more without giving the "Aha!" away.
     
  4. Nov 22, 2009 #3
    Re: Solid Mechanics questions - A new challenge :)

    My thoughts are that I should find E1111 and then E'1111 will be equal to E1111 since the stiffness matrice E does not change from one system to another (?)
     
  5. Nov 22, 2009 #4

    Mapes

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    Re: Solid Mechanics questions - A new challenge :)

    Agreed, because the material is isotropic.
     
  6. Nov 22, 2009 #5
    Re: Solid Mechanics questions - A new challenge :)

    Thanks!
    Now for the more challenging part:

    3ejyngnz22mw.jpg

    I havent met any student in my semseter that managed to get any progress in that question yet.
     
  7. Nov 23, 2009 #6
    Re: Solid Mechanics questions - A new challenge :)

    help, anyone ?
     
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