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  1. rb1957

    Aircraft Loads Simplification

    if your project is about the buckling of the skin, and the modelling the FeMap, then that's what to focus on ... not the flight loading to create a stress on the wing panel. Just assume a stress level.
  2. rb1957

    Fatigue Test of Metal Parts

    fatigue is about capturing the generalities of the operation with enough detail (and tolerance) that specific usage is reasonably captured. OEMs classify the operation of their plane with several configurations and mission descriptions ... a limited set of conditions so they can crunch the...
  3. rb1957

    Manager Says Keep the Restraints — I Think They’re Unnecessary. Who’s Right?

    don't double post ! ... this seems to have more response, so "report" your student forum thread, and ask for it to be deleted.
  4. rb1957

    Pulley & Winch Reaction Loads

    yeah ... not a FBD ... the vertical mast will have axial load and moment (assuming the horizontal arms don't run to ground).
  5. rb1957

    Shaved CSK NAS1097 rivet strength allowables

    wow will !, just wow !! I had no history on bucked tails though it is something we do here (sometimes) ... good to know. I thought CSK rivets were introduced as a drag reduction. I've heard that on some WW2 development (I think Lincoln/Shackleton from Lancaster) the engineers wanted flush...
  6. rb1957

    Fatigue Test of Metal Parts

    5G is the ultimate (or limit) static design load ... on the airplane (loads that are almost never experienced in real life). This will produce a bunch of loads (including aero, so talking inertia loads isn't complete or accurate) on the structure. Fatigue loads are not static design loads...
  7. rb1957

    Manager Says Keep the Restraints — I Think They’re Unnecessary. Who’s Right?

    Boss has already spoken to the team. There should be a single line of communication to the architects, else they say "someone told us something yesterday, today someone else tells us different ... what are we to do ?"
  8. rb1957

    Shaved CSK NAS1097 rivet strength allowables

    sounds like a nice thesis project ?
  9. rb1957

    How to find the position of the joint axis for Eccentrically Loaded Joints in ECSS-E-HB-32-23A

    ok, I downloaded the report ... the term "joint axis O-O" is not well defined, there is a lot (TLDR) in chapter 8 about this, maybe this clarifies the meaning. Else, contact the authors.
  10. rb1957

    Kinematics - force analysis

    and spherical chickens in a vacuum ... tan (theta) is where I went.
  11. rb1957

    How to find the position of the joint axis for Eccentrically Loaded Joints in ECSS-E-HB-32-23A

    it should be defined in the report, but my guess is the NA of the effective plates (that make up the joint) ... the effective widths of the flanges
  12. rb1957

    Design of Built-up section.

    ...to a short squat one. I think the flanges should be as wide as the beam web is tall ... it doesn't Have to be, but I is going to be mostly Aflange*height^2/2 on one side and Aplate*width^2/2 on the other ... rough and approximate ... so if you're getting a very thick plate, you need to...
  13. rb1957

    Python method to find maximum I-beam

    forgive me, but I think your handle perfectly describes this idea ! The flanges of pretty much every spar I've seen conform to the OML of the wing ... ie a rectangular spar doesn't fit a wing ... unless you're in a very small plane (like a kit plane, where expense may be more important ...
  14. rb1957

    Learning Structural Connection Types – Pin vs Fixed (Real World Example)

    your example is simpler than that. The horizontal arm is a simple cantilever, and so statically determinate. whether is is fixed or partially fixed is up for grabs, but it cannot be pinned. the base of the cantilever will react the required moment, where it does so with negligible deflection...
  15. rb1957

    Valid Pin Boundary Condition?

    "where does the moment go ?" ... in a pinned base, there is no moment ... though this will support "some" moment. I guess the failure scenario would see the connection lose moment capability before it fails completely ... so pinned might represent the final state. You could analyze as pinned...
  16. rb1957

    Shaved CSK NAS1097 rivet strength allowables

    we might use B for non-structural rivets in composites, where we don't want to over-squeeze the composite laminate
  17. rb1957

    Shaved CSK NAS1097 rivet strength allowables

    BB is AD material, full CSK.
  18. rb1957

    Shaved CSK NAS1097 rivet strength allowables

    when we need a custom CSK (and are "happy" that it is not a critical installation) we'll sometimes shoot BB rivets, so they overfill the CSK, and shave flush. or flip the rivet around, head on the inside, buck into the CSK, overfill, and shave flush.
  19. rb1957

    Shaved CSK NAS1097 rivet strength allowables

    AFAIK you are not allowed to shave 1097 heads. ... IDU, you mention something like 0.07" corrosion damage, but this leads to 0.003" shaving on the heads ? I'd replace the rivets, and see if anyone can notice the 0.003" heads ? But if your DER will buy what you're selling then go for it ! IF...
  20. rb1957

    JetZero Blended wing proposal

    all it'll need is (more) dollars and decades

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