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Recent content by davezil

  1. davezil

    Nodal Forces

    Hi David, 1.True,nodal forces are in global coordinates.you can set a param to get them aligned to 2d elemnts edges (check the qrg) 2.For static balance, the summation of forces acting on a grid(node) must equal zero.external loads equal internal loads. when you ask for gpforce in nastran it...
  2. davezil

    when to use 12I/T^3 and Ts/T in pshell card ?

    just in general ,wanted to know what nastran do with it. I understand it saves me the trouble of calculating a new equivelent E and thickness when modeling hc panel. does it mean the nastran stress output will be based on equivelent thickness and not on the user defined thickness ? I mean...
  3. davezil

    when to use 12I/T^3 and Ts/T in pshell card ?

    hi guys, could someone please elaborate on the subject? thnx
  4. davezil

    fuselage FEM validation ideas

    Thank you for your replies. I am looking for a better analytic approch(short cantilever beam under moment/transverse shear with thin circle profile) but could only find a correnction factor for shear deflection (Roark) which i dont find much useful. Or even better maybe you can suggest a other...
  5. davezil

    fuselage FEM validation ideas

    hi all, I've been a long time lurker ,this is my first post.I'm glad to be joining your community. my problem : I try to validate an aircraft fuselage fem model(built in nastran/patran),by comparing the axial stresses derived from nastran to a cantilever beam analytic Mc/I. in the model I...

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