Dyna result doesn't match Test result

  1. I try many time to model a simple tensile test for steel MAT_024 but the graph doesn't match from Dyna result and Test result.
    Process:
    1. Collect data Tensile strain and stress convert to True stress and strain use formula True stress: eng. stress*(1+eng. strain). True strain= ln(1+eng. strain) and then the true strain convert to plastic strain = true strain - (true stress / Young modulus) and plot the graph
    [​IMG]

    2. Use MAT_024 from dyna
    [​IMG]
    [​IMG]
    3. Then I extract nodout and sec force.
    [​IMG]
    LN1 is left node 1 (triangle on left)
    RN1 is right node (triangle on right)

    4. Eng stress= Force/Ao and eng. strain= delta Length / original length and plot the graph. (original area is 40, original length is 45mm)
    [​IMG]
    [​IMG]
    [​IMG]

    Then the both result was different, why? What the misstake? Anyone can help me solve this problem?
     
  2. jcsd
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