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Dyna result doesn't match Test result

  1. Jul 21, 2010 #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
    389954639.jpg

    2. Use MAT_024 from dyna
    389954647.jpg
    389954647.jpg
    3. Then I extract nodout and sec force.
    389954850.jpg
    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)
    389954524.jpg
    389954523.jpg
    389954525.jpg

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