INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Experimental plastic response during static loading

Experimental plastic response during static loading

(OP)
Hi! I'm looking for a study where some metallic Component have been statically loaded, preferably to failure while strains have been measured. I'm not looking for a study of an ordinary test specimen but more of a complex geometry like T-joints or bathtub joints. I have looked and looked after a study like this and would be very thankful if someone has a tip.

RE: Experimental plastic response during static loading

? OEMs do this all the time, but probably never publish. And rarely intentionally to failure (some do, to get that last data point; some don't, if it meets requirements that's good enough).

I think you'll need to do your own test.

another day in paradise, or is paradise one day closer ?

RE: Experimental plastic response during static loading

Try searching on the NASA Tecnical Reports server.

RE: Experimental plastic response during static loading

Tests like these do seem more like development tests rather than tests that demonstrate something useful from an aircraft certification point of view.
I've done a few of my own, but, again, just to see what happens. Sometimes there are questions if something fails in a brittle or plastic manner, has long deflections or short, settles to a new shape when relaxed or returns to the original "zero", that only tests can prove beyond a doubt. These deflections usually aren't part of the proof of structure that I'm trying to put forward to people higher up in my company or the aviation authority, so it's not thoroughly documented.

Are you equipped to do tests like the ones you need yourself? Even simple shop tools can be sufficient if you are only looking for general evidence, rather than an exact solution.

STF

RE: Experimental plastic response during static loading

Teodah...

You are interested in tension fitting design... a fairly complex problem for numerous reasons. NOTE each of the following element contributes ~33% importance to successful Tension fitting design.

Shape. There are fundamental elements to the physical design [shape/material distribution, symmetry/asymmetry, padding, thinning, etc] that affect analysis.

Fastening and bolting. Bolting practices, fastener-pattern layout and surface slope effects [need for tapered washers or spot-facing, etc] have a serious effect on highly loaded tension fittings... especially eccentricities and inducement of secondary bending and stress distributions/concentrations.

Materials. Alloy suitability/temper [FTy/FTu, etc], fabrication method, surface finish, grain quality/orientation, etc... make a huge difference in both elongation/ductility/toughness, yield/ultimate load and fatigue durability.

You may find the following report interesting.

Highly Loaded Airframe Fittings
http://www.dtic.mil/dtic/tr/fulltext/u2/a386666.pd...



Regards, Wil Taylor

o Trust - But Verify!
o We believe to be true what we prefer to be true.
o For those who believe, no proof is required; for those who cannot believe, no proof is possible.
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion"]
o Learn the rules like a pro, so you can break them like an artist. [Picasso]

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close