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  • Users: dcascap
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  1. dcascap

    SOl103 modes slow

    Hi all, I have a model which is a sandwich CFRP panel connected to a support structure, with around 300.000 nodes. The 4 connection between the panel and support structure is modeled with RBE2 and spring elements. Depending on the stiffness of the spring the sol103 significantly differs on...
  2. dcascap

    Blind rivet tension allowable

    Hi, I came across a guideline that ask for a tension allowable reduction k=20%. So the new tensile allowable would be 20% of what the vendor (as cherrymax) specifies for that blind rivet. Have you encounter similar guideline? I understand that blind rivets should not be designed to be used in...
  3. dcascap

    NAS517 tensile strength

    Hi, For NAS517 screws, which it suppose that they have a min tensile strength of 160 ksi according to the spec. Can I use this value as max strength of the screw in tension? Or should I somehow calculate also if the countersunk head fails before the shank? The later is quite difficult in the...
  4. dcascap

    Tension allowable NAS1204

    Hi, I'm using the NAS1204 bolt in a design and I encounter the following: The tensile stress allowable vs the tension force allowable on this spec significantly differs (for around a factor of 1.3) if we compared it by converting the stress allowable to equivalent tension allowable, as...
  5. dcascap

    Femap to openradioss

    Hi, Does anyone know if there is a way to use openradioss with Femap as a pre-post processor (Femap can translate to ? Or if there a way to circumvent this without buying another pre-post processor? Maybe a translator from Nastran to Openradioss if this exists... Thanks!
  6. dcascap

    Insert bending test

    Hi, I wanted to know if there is any bending test for sandwich CFRP/honeycomb structure insert. Basically I have an insert on the middle of a CFRP sandwich panel which is introducing quite a big bending moment to the panel itself due to the boundary conditions of the structure. I know that...
  7. dcascap

    Limit loads on rivets (fasteners)

    Hi all, Out of curiosity, in general when you evaluate a joint, in general you check ultimate strength of fasteners, plus limit/ultimate of the connected parts. Why limit load of the fastener itself is not checked? Do you have any reference explaining this? My thought is the following: Most of...
  8. dcascap

    Plate stress evaluation in the middle

    Hi, I'm doing a project about an aircraft skin modification, and my client has some guidelines about the FE model that I would like to discuss with you. Do you know why for a thin metallic structure as the skin, that are mostly modelled as shell elements (linear static) it is allowed to take...

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