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  1. rb1957

    Best Practices - Skin Repair of Trimout Over Circumferential Splice

    Opinions are like ... If I had a to patch over a splice strap, I would probably (depending on specifics blah, blah, blah ...) combine the splice strap into the repair dbr ... cut out the damage (or cancer as I'll often call it), rebuild frames and stringers, then add a large repair dblr over...
  2. rb1957

    Matrix Analysis Problem

    your problem is that the nodes are co-planar ... so move one node slightly off the plane defined by he other three.
  3. rb1957

    Fuel Bladder Testing

    I do hope you get an LPS for dredging up the exactly correct answer ...
  4. rb1957

    Eclipse 100 error

    sorry, no ... as I don't know anything about what you are doing. Is "eclipse 100" a language, like Python ? You "wrote the code" ... is this "code" a specific problem solving or a more generalised code ?? Is there no one there who can help, a thesis supervisor ?? What support do you have ...
  5. rb1957

    How to fix this?

    "Mrs. KootK, who is also a structural engineer, ..." damn ! I can just imagine the dinner table discussions ! (c'mon, smile)
  6. rb1957

    Eclipse 100 error

    I assume you don't have a user manual, nor anyone who has used this s/ware ? have you run a tutorial problem ? It is obvious that you have really confused it ! A google search "eclipse 100 manual" returned a bunch of hits which looked applicable ?? YT is often a good source ...
  7. rb1957

    Design tools

    verifying to what sort of level ? Just running s/ware isn't enough unless it's something like NASTRAN where there is a lot of knowledge and experience. Simple free FEA is IMO something to be avoided, or at least plan on doing a bunch of work validating the s/ware, and control of the s/ware...
  8. rb1957

    How to fix this?

    Whilst I understand the value of load testing, I agree with Flotsam. Setting up a test would be hard enough, and then what happens if the test fails ?? And this is a low tech residential project (yes?) rather than a high tech commercial project. my 2c ... this looks pretty shite to me (but...
  9. rb1957

    Theoretical Question - Planar Truss Problem

    i was referring to this pic (from reply 19) ... ... which I read as 6.8 kN axial load in one member and 3.2kN shear in the other, so the members have bending stiffness (to support shear loads) ... and the FB looks "off" ... I see the 3.2 kN creating an unbalanced moment about the load, and...
  10. rb1957

    Need help in selecting good course on aerospace or aircraft engineering

    AME ... "This is not a degree, but a licensed course focused on certifying aircraft for flight." not as I understand it ... an AME license is required for someone doing maintenance on a plane. Companies making planes (or modifying them) usually use an AME license as a "ticket through the door"...
  11. rb1957

    Changing Nastran .f06 file Format

    you want the op2 or f04 files. but why are you extracting results from the output, rather than using a post-processor (like FeMap or PATRAN) ? but you can use the predictability of the f06 to find text strings and count lines to the number of interest (what I did some 30 years ago before...
  12. rb1957

    Plate Bending Problem

    BTW, plates are lousy in bending ... add stiffeners, or sandwich panels.
  13. rb1957

    Theoretical Question - Planar Truss Problem

    yeah, but ... you've modelled the spokes as beams, and the lateral one is picking up a lot of load. If axial rods then the result would be "different" (for the load given it would all be reacted by the aligned spoke; for different loads each spoke would react the component load).
  14. rb1957

    Inspections before installation of landing gear

    agreed, all required inspections to "verify the serviceability and operational integrity of the main landing gear" as a complete system (ie the MLG itself and the on-aircraft components of the MLG system) are defined (and prescribed) by the AMM. If you think there is something missing, then you...
  15. rb1957

    Add supports in the Lusas model

    is this a single element ? or 1000 ?? if it is a single element, then you'll need to break it into 5 quite nasty shaped elements. if 1000, then nodes already exist where needed so "NP".
  16. rb1957

    Truss Question - Sanity Check

    maybe worry about things not being perfectly aligned ? But then the buckling is based on a single bay length, so maybe this isn't something to worry about ?
  17. rb1957

    Changing Nastran .f06 file Format

    I think you want the f04 or the op2 files. Why are you not using a post-processor (like FeMap or PATRAN) to view the results ? Alternatively you can do what I did some 40 years ago (OMG) ... the f06 file is very predictable so you can figure out particular text strings and use something like...
  18. rb1957

    Inspections before installation of landing gear

    I'd put the a/c on jacks and cycle the gear. If you want to apply loads, like landing then you need a rig like the manufacturer's have. What are you trying to do ? Why do you want to do this ?? is "break" a typo for "brake" ? Are you trying to test the hydraulic components mounted on the...
  19. rb1957

    Discussion on circumferential non-uniform temperature distribution and deformation in aero-engines

    Have you answered your own question ? I'd've thought that engines were very susceptible to even small loads, but if this is a thing that OEMs don't worry about, then why you ? I'd've thought (like SWC) that OEMs did worry about this, and do so in a proprietary manner, so you may not find open...
  20. rb1957

    Blind rivet tension allowable

    it sounds like your "guideline" is an inhouse stress Analysis Handbook. It sounds like most I've encountered where various other manuals are "shamelessly" plagiarized. And in each copying, some meaning is lost. I've used the McCombs tension table. My suggestion would be to run some tests so...

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