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Homework Help: Strain Energy - Displacement

  1. Jan 10, 2010 #1
    Someone plz help to solve this its urgent..
    1. The problem statement, all variables and given/known data
    2. Relevant equations

    3. The attempt at a solution
    At A-B
    There is No load so dM/dP= 0 and dU/dP= 0

    At B-C
    M = -px - wx.x/2
    dM/dP= -x
    dU/dP = Wx^4/8EI

    At C-D
    M = -Wb + Px
    dM/dP = x
    dM/dP = -Wbx^2/ 2EI

    When i include all vaues to compute total starin energy, (AB+BC+CD)
    it shows a value of 0+ 444.44-2222.22 = -1777.78

    Strain energy = 1/2 x(load.)x (deflection)
    = 1/2 x 2000 x deflection.

    When i equate both valuse, i get deflection value of 1.78m which looks like very big value for a beam of 260mm long
  2. jcsd
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