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  1. dcascap

    Insert bending test

    The model is a bit more complicated than that haha but of course FEM connections tend to rely in a lot of assumptions to simplify the model itself. Thanks for your help, I appreciate it!
  2. dcascap

    Insert bending test

    yeah that is what I thought... I can't redesign but I think for now I'll need to figure out if the moment is real or if is just because of the way I modelled it. Thanks for your answer!
  3. 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...
  4. dcascap

    MDOF Spring-Mass-Damper Problem

    Oh yeah, sorry I checked the wrong qrg (Altair). But then, it seems that your output is in global coords, at least in Simcenter Nastran (I'm more familiar than with MSC Nastran) you use SDISPLACEMENT in the case control to ask for the modal displacement output. In your code you're using DISP...
  5. dcascap

    MDOF Spring-Mass-Damper Problem

    Hi, From a quick check of your code I see that the DOF entrance for the initial condition card (TIC) is -1, and it should be a number between 1 to 6 (1,2,3 --> tx, ty ,tz 3,4,5 --> rx,ry,rz), what if you change it to: TIC, 20, 1, 1, 0.3914, 0.9071 TIC, 20, 2, 1, 0.4950 , -2.1213 TIC, 20, 3, 1...
  6. dcascap

    Question about NASTRAN execution / installation

    Are you using MSC Nastran? I think what you're looking for is the command PARALLEL which allows you to use SMP in the different solvers. It is also important to notice that performance varies with solver and is not always convenient to put more cores. Check this article for more info :)...
  7. dcascap

    Limit loads on rivets (fasteners)

    Thanks for the answers, it's funny that you mentioned that rb1957, it is literally how the conversation went. But then I thought to myself, well it does trigger my mind a bit and I could ask for an external opinion to verify I'm not missing something
  8. dcascap

    Limit loads on rivets (fasteners)

    I totally agree with you guys, you confirmed my thoughts. I just wondered if there was a reference for it, even though that from experience is not used and it has never been a problem in industry as rb1957 mentioned. It came today in a discussion with a colleague but I said I didn't not have a...
  9. 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...
  10. dcascap

    Plate stress evaluation in the middle

    Thanks for rhe answer, I cannot really show a sketch of the configuration due to IP but with your input I have enough to work with, thanks!
  11. dcascap

    Plate stress evaluation in the middle

    Thanks for the answer! That makes sense, but as you said except when secondary bending plays a bigger role. In my case I'm installing a blade antenna with an inner profile attached to the stringers. I was evaluating aero load using the dive speed, and the resultant side force is considerable...
  12. 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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