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  1. ShroffS

    NASTRAN composite failure mode for Hashin criterion

    A first ply failure analysis of a composite laminate using Hashin type failure criterion is carried out. The failure results in the .f06 file indicate a "failure mode" which are numbered 1 - 4. As I understand it, it is indicating the dominant failure mode - fiber tension/compression or matrix...
  2. ShroffS

    laminate stress in NASTRAN

    Thanks @SW. I did not have this confusion before, however, to double check I read about the NOCOMPS card that is used to output the stress for an equivalent homogenous section. The item in the list that bothered me was that "when Z0 is not defined as -0.5 times the thickness of the laminate...
  3. ShroffS

    laminate stress in NASTRAN

    I am trying to extract composite laminate stresses from NASTRAN. I have read in the NASTRAN manual that the Elements stresses options yields incorrect results. How should I go about calculating the laminate stress from the individual ply stresses?

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