Membrane Elements

FatmacFatmac


I have been experimenting a little with membrane elements on a simple pillow (with a longer term plan to use them to model sails). To use M3D8 elements I had to omit the shell key card add a new *MEMBRANE CARD and introduce a custom card for the M3D8 elements. Is this the best approach, and have I missed anything? When the model uses membrane elements the max deflection is some 50% greater - this sounds reasonable to me but do others feel this is likely??

Comments

  • VictorVictor
    There have been bugs with membrane elements in CCX so be careful. That's why it's not enabled in the GUI.

    You can use CCX -> custom element type to change quad8 to M3D8 so you don't have to rewrite all the element definitions.
  • FatmacFatmac
    I could not make the membrane work without defining the section as a *MEMBRANE card and disabling the *SHELL card. See attached file. I now think that part of the difference in the shell and membrane solution is the constraints. I have tied the 2 layers together, i'm think in the shell this may restrict the degrees of rotation between these layers -to get a better comparison I probably need to work on the constarints/boundary conditions
  • VictorVictor
    Yes, you'll have to define *MEMBRANE and disable *SHELL like you did. I wasn't sure you'd used custom element type, that's all. It looks like you have membrane working fine. I'm not sure what the bug was or if it's still present.
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