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  • Users: franc11
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  1. franc11

    Catia V5 GAS modulus to simulate fsateners

    Hi, Does anyone know the best way to simulate a bolt and a shearpin connection with CAtia V5 GAS modulus??
  2. franc11

    Heel and tow effect reversed

    I get you on this, but my point is, if you apply the load up on the lower plate like shown with (2) is there any way that the right fastner could NOT be in tension, considering that the pivot would be the right edge of the upper plate.
  3. franc11

    Heel and tow effect reversed

    Hi, Head scratching question here. If you bolt two plates, one over the other, with two rows of fasteners like this : (note that the two plus sign over one another means the lengths of the bolt linking one plate over the other...hope it's clear) +++++++++++++++++ + +...
  4. franc11

    Lug under tranverse load formula question

    Hi there, Little question here. Usually, to calculate the allowable load for a lug under transverse load, you have to calculate and average area of the section of the lug. The formule is : Aavg = 6/(3/A1+1/A2+1/A3+1/A4). Here's my question. In all the books and references, they show without...
  5. franc11

    Export Mesh from CAtia V5 to patran

    Hi, I read in this post thread560-140535 that it was possible to export a mesh from CAtia V5 to a bdf file that can be read by Nastran and Patran. Anyone knows exactly how to do this? I'm looking for some export data but can't find any. Thanks!
  6. franc11

    Lug analysis as a cantilever beam

    Dooron, I've just read ESDU 91008 : Lug strength and their approach is exactly the same as in Niu or Bruhn. Maybe there's another ESDU I didn't find. But Niu and Bruhn propose to analyse the lug as a cantilever beam if Ktru or Ktry fall under an approxiamte cantilever strenght curve, but they...
  7. franc11

    Lug analysis as a cantilever beam

    Thanks for those advice. I have access to ESDU, so I'll look it up more closely. I read them quickly a couple of time age and thought is was basically the same as in Niu or Bruhn. I'll also look in Roark which I only have the fifth edition, but I guess it's mostly the same.
  8. franc11

    Lug analysis as a cantilever beam

    Hi, I'm reading a single lug stress analysis. The theory being used is not familiar to me. I was expecting an analysis based on what we can find in books like Bruhn and Niu. When using this method, the margins of safety were very negative. So what they used is an analysis considering the lug...
  9. franc11

    Margin of safety for combined loads

    It seems fair to me. That's what I've had done. I used Von Mises 3D and compared it to Ftu on 15 points on my section. At some points, it showed that my structure would fail, especially because of the bending. i'm now considering plastic bending to give me better margins. But is there a way to...
  10. franc11

    Plastic bending

    Hi, Here's a question that's been bothering for some times now. Cozzone showed a method to calculate an ultimate or yield bending moment considering the beam is in pure bending. The catch is that most of the beams also have axial loads. For example, a tube I'm trying to analyse has a bending...
  11. franc11

    Margin of safety for combined loads

    Here's a question that's been bothering me for some time. I have a rectangular section in the XY plane. For this section, I have an out of plane tension force, I have one shear force along Y axis, one shear force along Y axis, plus a bending moment around X axis and a bending moment around Y...
  12. franc11

    Vertical axle travel vs increase weight

    Basically, you mean that it depends on the gear and tire stiffness and it might increase or it might also decrease? Because, the thing is that I have results of the simulation and it gives me lower VAT for the increase weight on gear of the aircraft. I was just wondering if that could be...
  13. franc11

    Vertical axle travel vs increase weight

    Hi, I'm looking at the loads on a MLG obtained with a simulation software. The aircraft I'm studying has has a weight increase. So for the same landing cases, we have an increase in drag load ans in vertical reaction. So I was wondering if the vertical axle travel should increase or decrease...
  14. franc11

    Mershing a 3D cylinder

    All right, seems like I've been albe to mesh my cylinder, but I have a lot of difficulties to constrain de model. I want to simulate an interfrence fit between a cylinder and a pin. I've calculated equivalent pressure on the pin and I'm applying it on my pin model. How am I suppose to constrain...
  15. franc11

    fatal message

    Usually, it should come with a message stating that you have to constraint your model in a proper way. I have the exact same error message but can't figure out how to constrain it properly.
  16. franc11

    Mershing a 3D cylinder

    I have a problem on what seems a pretty easy problem. I made in Patran a sylinder. Since i do not have the license to use primitive, I had to make a rectangular surface and revolve it around the z-axis. Then, I only want to mesh this cylinder, but Patran tells me that it is not meshable. I...
  17. franc11

    What happens when bolt threads in member joint?

    Hi, I have this little question. Does it make any difference on the bolt prelaod or clamping force wheter the bolt thread in the second member or it is clamp with a nut outside de member? Thanks!
  18. franc11

    Axisymmetry using Patran

    Not that I'm an expert, but what do you mean by it doesn't work? Is there an error message in Patran? A fatal error in Nastran? Or just it gives you crazy results?
  19. franc11

    Elements coordinate systems.

    Thanks.
  20. franc11

    Elements coordinate systems.

    Hi all, I have a little problem. I'M using MSC Patran and I realized that when I'm meshing, the coordinates system of my different sections of meshing are not oriented the same way. Is there any way to just modify the orientation of the element? Or, when I'm accessing the results. I can make a...

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