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  1. PhilipFry

    Fundamental Question about Dynamic Pressure.

    Yeah, I got it. I've really got to cut down on smoking crack. ;-)
  2. PhilipFry

    Fundamental Question about Dynamic Pressure.

    Ah, yes, I'm retared. I should turn in my degree.
  3. PhilipFry

    Fundamental Question about Dynamic Pressure.

    Oops, my fingers got ahead of me. rho=density=kg/m^3 velocity=m/s rho*velocity^2=kg/m^3*(m^2/s^2)=kg/ms^2=1 Newton!
  4. PhilipFry

    Fundamental Question about Dynamic Pressure.

    Alright, I can't believe I need to ask this question, but I'm looking at the term in Bernoulli's equation for dynamic pressure (1/2*rho*velocity^2). Can someone explain to me the units on this this? When I look closely, it looks like it gives the answer as a unit of force, not pressure...
  5. PhilipFry

    Stress Strain Curve for Al 6061-T4?

    Well, let me be more specific.... 6061-T4 Tubing: 0.028-0.035 inch thick
  6. PhilipFry

    Stress Strain Curve for Al 6061-T4?

    Howdy, Does anyone know where I can find a stress strain curve for Al 6061-T4. I've been able to find 6061-T6 relatively easily, but T4 is giving me fits! Thanks in advance! PJF
  7. PhilipFry

    What do you do when you don't trust your boss?

    "Secondly: This is a nightmare situation - for your boss. " I agree. He is under a lot of pressure to prove than his assumptions won't matter in the long run. You know, no harm no foul. That worries me and I take everything he says with a grain of salt. "Did you "follow" your boss' calcs...
  8. PhilipFry

    What do you do when you don't trust your boss?

    My boss (stress analyst) has made several assumptions that have been flat out wrong. It appears to the rest of the team that these assumptions have been made in order to reduce our calculated stresses. Word of SOME (not all) of these assumptions have reached upper management and we've been...
  9. PhilipFry

    Von Mises Vs Max Principle

    That would be Max Shear criteria then, wouldn't it?
  10. PhilipFry

    Can MSC Nastran solution 600 handle 1D gap elements?

    Because, I heard that it can't. Is that true?
  11. PhilipFry

    Stress Concentration in Aluminum T-Joints

    The loads were provided to us through our loads department. I'm sure there is some conservatism in those estimates, but none of us really know how much. The culprit in question here is non-aged, non post heat treated, al 6061-t6. Thank you again for your suggestions. I know we had...
  12. PhilipFry

    Stress Concentration in Aluminum T-Joints

    You are starting to open the same can of worms that I have on my desk. Q: Where are you getting the Kt to divide by? A: That's the $64,000 dollar question around here. There is no definitive answer for that question. Q: Have you checked your model for consistent units / correct BCs / etc...
  13. PhilipFry

    Stress Concentration in Aluminum T-Joints

    Q: Is the static load due to pressure only? What does it simulate? An ultimate load case or a service load or the proof test load? A: No, but pressure is the biggest contributor. If I don't divide by the Kt, the part shows stresses higher than yield in almost every load case. Q: Are you...
  14. PhilipFry

    Stress Concentration in Aluminum T-Joints

    Yes, it is worrisome, which is why I think I need some direction/encouragement. My background is that I've recently graduated from college with masters in mech eng, with no real industrial FEM experience, no real stress experience, but I’m concerned about the corporate trend of just pushing...
  15. PhilipFry

    Stress Concentration in Aluminum T-Joints

    "Always ask yourself "what am I trying to accomplish / what question am I trying to answer with this FEA?"" That's a difficult question to answer without test data...how do I know what the failure mode is? I'd like to know if I should be concerned about static loading (high loads) on the...
  16. PhilipFry

    Stress Concentration in Aluminum T-Joints

    Thanks. I actually found this article earlier today. Small internet world. Unfortunately, the article raised a few more questions. The article repeated mentions that MOST engineering applications ignore the stress concentration, owning it to localized strain hardening. The example shown in...
  17. PhilipFry

    Stress Concentration in Aluminum T-Joints

    Hi. I'm still a bit new to the stress world, but I think I know just enough to get me into trouble. We've been discussing stresses in t-joints here recently and it came up that we should not be looking at the peak stresses in the fillets for static loads. It's been suggested that we use the...
  18. PhilipFry

    Aluminum Weld Shear Strength?

    Here's an easy question. I'm using 4043 to weld two 6061-T6 tubes and I'm trying to figure out the strength of the weld. I've found some literature that says the minimum shear strength of a weld using 4043 is 15 ksi. Does that figure include the weld efficiency, or would I need to knock that...
  19. PhilipFry

    Sweeping and changing cross-sections.

    "May also be able to use a Multi-section solid\surface." That's actually what I ended up doing...and it worked pretty well once I got the correct closing points.
  20. PhilipFry

    Sweeping and changing cross-sections.

    I'm trying to accurate model the bend of a tube. The cross section of the tube initially starts out as a circle in the straight portions of the tube. It becomes more of an oval in the bend, and has peak ovality at the 45 degree mark in the bend. How should I go about doing this?

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