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Stiffness of specimen under tension

  1. Jun 23, 2013 #1
    Hello,

    I am conducting FE modelling on specimen of steel surrounded by concrete,
    and i obtain curve which have stiffness similar to experiment(all assume linear behaviour for all materials)
    but the start of curve is not convenient
    displacement
    -0.0071033
    0.0123265
    0.0310888
    0.059264
    0.101501
    0.164798
    0.259773
    0.402099
    0.615813
    0.93855
    1.42313
    1.87749

    force
    -5.13E-10
    7006.94
    8918.8
    11488.5
    15339.3
    21095.9
    29776.8
    43126.5
    63036.4
    90018.3
    129831
    169167

    the negative displacement at the beginning is anticipated due to the fact the sample was preloaded(shrink in length)

    So what i did is shift the curve to the right by subtracting all displacement value from the initial one
    and maintain the same values of force

    AND I got the following curve which is not convenient in the beginning
    so did i do maths error when i shift the curve or what?

    ANY HELP IS APPRECIATED

    please consider the blue line
     

    Attached Files:

  2. jcsd
  3. Jun 24, 2013 #2

    CWatters

    User Avatar
    Science Advisor
    Homework Helper

    Not my field but...

    Don't you need to know or work out the preload force and subtract/add that as well?
     
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