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  1. GodzillaSuit

    Bruhn, The source of Fig.C11.46

    NACA TN 4053 has a discussion and some curves (check the NASA technical report server), I also remember seeing a hilarious paper that had the testing method of asking a bunch of people around the office at Lockheed if a panel looked "permanently buckled" but I can't remember the source, tbh the...
  2. GodzillaSuit

    Is PBS Compute Manager necessary for using HyperWorks on cluster machine?

    You should be totally fine using the open source Torque/MOAB scheduler. They offer less expensive paid support too if you are having issues setting up or running your cluster, which will definitely have occasional outages. PBS pro has some nice features at the expense of having some annoying...
  3. GodzillaSuit

    DIANA TNO FEA - Python - MATLAB

    I've done this with a bunch of solvers in Python. Use the subprocess module to call the command line application with whatever arguments you want. Unless I made a typo somewhere, it should look like this: import subprocess job = subprocess.Popen("<insert diana command here>"...
  4. GodzillaSuit

    Wrinkling vs Inter-rivet buckling

    Inter-rivet buckling is an instability that occurs between two adjacent rivets in a stiffener, the strap of skin between two rivets buckles as if it were a wide column supported by a rivet on each end. Wrinkling is a skin buckle that continues through a stiffener attach flange (possibly) to the...
  5. GodzillaSuit

    Structures Terminology: Longeron vs. Stringer

    You might also categorize them in terms of applied loads. Stringers are generally designed to primarily take axial loads, so in a simple coarse-grid loads model you might represent them with a CROD. Longerons are generally designed to primarily take axial and bending loads so a simple...
  6. GodzillaSuit

    NACA and NTRS Servers Off-Line

    The servers are back up. I heard that they returned everything that had been reviewed for ITAR compliance, and that they will be slowly reviewing and returning everything that had not.
  7. GodzillaSuit

    Good books for Writing FE Code using C++, Fortran, or MATLAB?

    The course materials are likely to disappear at the beginning of a semester, you might have to wait until May for all of the homework and solutions to be posted online. I would use an open-source finite element solver instead. This book is excellent and they have a Python version of their code...

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