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  1. glulambeam

    looking for inputs on dragonplate and how to define ply orientation of certain structural components

    Thanks. I was able to get some help at work with this.
  2. glulambeam

    looking for inputs on dragonplate and how to define ply orientation of certain structural components

    Hi, so one of the designers at my company has decided to go cutting-edge and create a structure using COTS carbon fiber structural members from dragonplate.com In particular, there are shapes like this one: https://dragonplate.com/075-Square-Tube-Carbon-Fiber-Gusset-90-Tee I am not...
  3. glulambeam

    re: 12L14 steel, increasing strength through heat-treatment

    What's the upper maximum that this steel can be heat-treated to? (e.g. becomes too brittle for practical use)? Is there a materials guide somewhere that covers this information for a broad set of steel grades? Please advise. Thanks!
  4. glulambeam

    in times of desperation to get a welded aluminum structure to pass, what is the better choice?

    Again, I'm sorry that I hadn't included that important tidbit earlier. Duly noted; I should not be posting on a whim when I'm tired and about to retire to bed for the evening/early morning. Thanks all, for the inputs.
  5. glulambeam

    in times of desperation to get a welded aluminum structure to pass, what is the better choice?

    sorry guys...I forgot to qualify earlier that the issue I'm often faced with is trying to get the welds to pass on aluminum 6061-T6 structures, typically b/c my designers tend to undersize things and not take into account the strength knockdowns that are associated with welded aluminum...
  6. glulambeam

    in times of desperation to get a welded aluminum structure to pass, what is the better choice?

    It's cards on the table time. An aggressive design schedule on a welded aluminum 6061-T6 structure has forced you into a corner [edit: in terms of getting welds to meet strength requirements]. Do you... (A) specify 5356 filler? (B) call out CJP welds on more than just a few places...
  7. glulambeam

    Welded aluminium

    https://smile.amazon.com/Aluminum-Structures-Guide-Specifications-Design/dp/0471019658/ref=sr_1_1?ie=UTF8&qid=1522741286&sr=8-1&keywords=aluminum+design Aluminum Structures by Randolph Kissell. This's a pretty good read; some of the tables are printed too dark though, so you may want to hunt...
  8. glulambeam

    re: cbush elements with non-coincident nodes - how long is too long?

    thread825-358723 As a follow-up to this old thread, it's known that CBUSH elements can be used to connect surfaces with offsets (e.g. the cbush elements can have non-coincident nodes), but is there a rule of thumb on how large the gap/how long the cbush can really be? Like say for example...
  9. glulambeam

    how critical is it NOT to use martensitic steels in condition A without heat treatment?

    Thanks for the inputs!
  10. glulambeam

    how critical is it NOT to use martensitic steels in condition A without heat treatment?

    On the surface, 15-5 in condition A, AMS5659 has excellent strength properties (F.tu = 160 ksi, F.ty = 140 ksi on the AK Steel website (aksteel.com), etc) I was told by one of the older materials engineers (now retired), that one should never use 15-5 in just its annealed condition due...
  11. glulambeam

    How do I do an impact analysis if using velocity and weight of an item? (enforced displacement)

    thread825-204956 I have a cover that I need to analyze for an impact load (in this case, a 1 lb object that is dropped from a height of 20 in). I have an analysis document, but the person who wrote it skipped a bunch of steps and also might be too busy to answer any questions/get involved...
  12. glulambeam

    re: loads on keenserts follow-up

    Hey Draw...thanks. When re-reading Shigley, the same though occurred to me. It's no different than when checking a nut (some people have gotten crazy enough to go that far around my office).
  13. glulambeam

    re: loads on keenserts follow-up

    thread404-275179 referring to this earlier thread: http://www.eng-tips.com/viewthread.cfm?qid=275179 Don't the threads on the insert take any amount of the external load? I've been usually adding the preload + the full amount of external load to check and see if the parent material the...
  14. glulambeam

    re: bolt bending

    I'm thinking I probably need to bring up an issue with a legacy design at my company, b/c somewhere along the line, someone decided that loading 100 lbs on a threaded rod in bending was a perfectly good idea. Mind you, it's also a 300 series stainless steel threaded rod as well. Thanks for...
  15. glulambeam

    re: bolt bending

    I usually use the basic minor diameter for computing the section modulus of a bolt in bending. It's the smallest diameter, and thus conservative. But is there perhaps a way to be less conservative? Has anybody else used the effective diameter that can be back-calculated from the stress...
  16. glulambeam

    stuck in the same situation (bolts attaching two plates, separated by spacers...)

    Thanks all. I'm probably going to have the designer thread into the spacer, or better yet, have the spacers removed from the design. It turns out the no10's are limited to a max torque of 10 in-lbs. If the system fails Tmoose, an expensive piece of hardware falls to the ground, and I'll...
  17. glulambeam

    stuck in the same situation (bolts attaching two plates, separated by spacers...)

    @rb that's my feeling. It doesn't make sense without sufficient preload being present to prevent wedging/gapping from happening. @jg yes, 115 lbs isn't alot, but is it known if any of it can actually get transmitted to the sleeve?
  18. glulambeam

    stuck in the same situation (bolts attaching two plates, separated by spacers...)

    thread404-400310 Hi smart people...I also need your help. Please refer to Irene's diagram. The spacers are 1" in diameter, with a 0.2" concentric thru hole to allow a #10-32 bolt. They are about 2" long and separate two plates as in the diagram in the referenced thread. The...

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