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  1. freebody

    Buckling of thin shells/membranes

    Corus makes a good statement. Thin shell/membrane buckling is highly dependent on thickness, geometry, and boundary conditions. It also occurs usually due to compression and/or shear loading. I like to first run an eigenvalue buckling solution (based on the differential stiffness matrix) to...
  2. freebody

    Extracting loads from measured strains

    Correlating measured strain data to a finite element model can be extremely tricky, especially if the applied loads are unknown. Also, other influential factors include modeling details of your parts, measured strains in high gradient areas, mechancal attachment assumptions, etc... I have...
  3. freebody

    Help for PATRAN needed

    Hello Spirit, I would recommend the two suggestions by zuardy, especially "attaching" the xdb file. This will not read the results into Patran, merely reference to it. Also, I would like to suggest two other options. 3. If you have more than 1 subcase in the run, lessen the number...
  4. freebody

    about rigid connections in nastran

    Hello folks, I like zuardy's post for the explanation of the connection of a node at the center of the hole. In both cases (RBE2 and RBE3) the degrees of freedom at the center node DEPEND on the motion of the surrounding nodes. Also, with both you can specify any DOF that you wish. For...
  5. freebody

    about rigid connections in nastran

    For linear static analysis in NASTRAN, the RBE2 and RBE3 elements are different methods for transfering nodal displacements between grids. The RBE2 element rigidly "ties" the independent and dependent degrees of freedom together in the directions specified. The RBE3 is different...

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