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  1. YoungTurk

    USC Online Master of Science Aerospace Engineering Degree

    I obtained my MS through this program and completed a few years ago. Here is a general takeaway, let me know if you have any more specific questions. My admission was oddly difficult. I met and exceeded all stated requirements for the program, but they withheld their decision until days...
  2. YoungTurk

    Showing Plate and Beam Stress Results Simultaneously

    What you're looking for is a check box labelled "Additional Vector(s)" in the post processing toolbox. You can actually specify two additional vectors once you check that box.
  3. YoungTurk

    Showing Plate and Beam Stress Results Simultaneously

    Yes, I think there is a way. You have to look in the post process tab/window for second contour or second criteria and not the popup you access from the toolbar. If I recall correctly, you only get one set of levels though, so outputs have to be in the same range. Not sitting in front of...
  4. YoungTurk

    "Dry Pin" Bearing Allowables

    I never got further on this topic than the information shared in this old thread. http://www.eng-tips.com/viewthread.cfm?qid=259226
  5. YoungTurk

    Iosipescu Gage

    We're performing Iosipescu ASTM D 5379 shear lab tests and using foil gages to measure the shear strain. Vishay makes a custom gage for the application, but we had some difficulty with results, lead time and cost. http://www.vishaypg.com/docs/11525/shearpat.pdf Can anyone provide alternative...
  6. YoungTurk

    Additional cost due to fuel consumption of a device in flight

    You forgot to factor in the fuel to carry the fuel you will need to carry the fuel for the chiller. Its turtles all the way down.
  7. YoungTurk

    Can I attach a 2024 T3 doubler to 2024 T42 skin?

    Given that T3 is typical sheet stock, this isn't at all uncommon. T3 is cold worked, T42 is more commonly used for parts which are heat treated after fabrication - permitting easier forming but preventing the use of cold working. One thing to check is whether or not both skin and doubler are...
  8. YoungTurk

    In Plane Displacement Results for Plates/Shells Subject to Normal Force

    I'm trying to estimate the lateral / in plane displacement for a problem that amounts to a plate subject to normal pressure. Research and trial so far makes me think this data can't be obtained from plate elements - in plane displacements always show zero. Trying other formulations but so far...
  9. YoungTurk

    Graduating with barely a 3.0 GPA from a top university- should I worry?

    I recently obtained a Masters in aerospace from another top US university with a similar GPA. It is not on my resume, and it hasn't come up. On the other hand I have experience, so that may affect my responses. My suggestion is leave it off and keep the focus and your qualitative...
  10. YoungTurk

    ANA and JAL Ground 787 fleets

    http://www.chicagotribune.com/news/sns-rt-us-boeing-securaplanebre90j0b3-20130120,0,3617116.story
  11. YoungTurk

    Crippling of Section Due to Bending

    If you're using the plastic bending curve for the same section profile then you needn't check crippling. If you've got a section such as a hat or zee for which plastic curves are not available/applicable, then you need to check the crippling value for the compressive cap as rb says. I've often...
  12. YoungTurk

    Bureau of Labor Statistics - Eng Salaries

    Thanks! Especially find the by area maps informative.
  13. YoungTurk

    Spring Positioning on a Cantilever beam

    Must be the advanced course, last semester we knew the location and only had to calculate the deflection :) http://www.eng-tips.com/viewthread.cfm?qid=333709
  14. YoungTurk

    Fastener Spec Source?

    Give this one a try: http://www.everyspec.com/MIL-SPECS/
  15. YoungTurk

    What is standard industry practice for repair design approval?

    Kirby, I'm not a repair station expert, I work on the other side of the fence with the ODA at a facility which also happens to have a repair station. Also, not all repair stations have the same procedures and requirements, so take my info with a grain of salt and find your repair station manual...
  16. YoungTurk

    What is standard industry practice for repair design approval?

    As I understand it, none. The delegated authority of the repair station lies in the inspection/QC department and is largely limited to performing repairs in accordance with previously approved repairs such as the SRM. Your DER is correct that he is not supposed to approve minor repairs and...
  17. YoungTurk

    M.o.S vs F.o.S

    Kind of, maybe, but no. It simply means that we are choosing to express our result in terms of how much margin is remaining after all required/requested factors are applied. You could argue that a perfecly optimized structure (for weight/performance) would have zero margin everywhere, but then...
  18. YoungTurk

    M.o.S vs F.o.S

    I think we're saying the same thing "reflect the margin after (applying the FF)" = "additional factors are applied before margin" I've even seen some places apply the FF factor directly to the loads, which is WAY before calculating the margin, though my personal preference is to show it in or...
  19. YoungTurk

    M.o.S vs F.o.S

    With respect to rb - I think MS = FS - 1 is a misconception of sorts, though I fall back into it myself. Margin is how much additional strength you have, AFTER all of the relevant factors have been applied. A more accurate formulation is MS = Strength / (Stress x Factor) - 1 The difference...
  20. YoungTurk

    Holes Tearing Out of Sheet Metal Box

    Catastrophic is as catastrophic does. Industry jargon would be an "event" or "emergency landing". rb is stearing you on the right path. Determine the lowest allowables in the joint for shear and tension, then combine using Bruhn's equation or similar. Nice sketch, but don't invent a new...

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