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  • Users: rybose
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  1. rybose

    Output Beam Local Coordinate System

    I am looking to output orientation vectors of beam elements to either the ODB or FIL. I have done this for shells using: *OUTPUT, FIELD *ELEMENT OUTPUT, DIRECTIONS=YES SF The local coordinate system shows up in the ODB in the fieldValue.localCoordSystem member. It also appears in the FIL...
  2. rybose

    Buckling Composite Curved Panel

    Looking for some methods to perform a buckling analysis on a composite cylindrical panel (simply supported on all edges). Most references for cylindrical shell buckling seem to implicitly assume a full cylinder. Whitney (Structural Analysis of Anisotropic Plates) has a solution for a curved...
  3. rybose

    Eigenmode Imperfections - Postbuckling

    Is there any way in Nastran to apply geometric imperfections for a postbuckling analysis? In Abaqus, you can use the *Imperfection command to point to a results file of a buckling eigenvalue analysis. *Imperfection, file=buckle_results 1, 0.05 2, 0.05 .. (specify mode number and max...
  4. rybose

    Parsing FIL file with Python

    Hello all, I am looking to access the .FIL file instead of going through the .ODB. The Abaqus documentation says that each entry is 8 bytes long whether it's a string, float, or integer. I am trying to used the struct module to convert the binary. I am unsure what format to use to read 8 byte...
  5. rybose

    random vibration fatigue - normal mode method

    All of the literature available I've found on random vibration fatigue assumes the existence of a stress response PSD. This is required for the many methods that estimate fatigue life of broadband vibration response (i.e. Dirlik). The FEA package I use, applies the Normal Mode Method to...

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