Hi Berkshire,
Thanks again for keeping up with this thread. I think a splitter plate is a great idea...while the current design i was investigating is too late to change, i can make the suggestion for future designs. And to answer your question...there isn't anything there to really provide...
Actually, I'm as confused as those of you keeping up with post on some of the things that were (or weren't done)...such as heat treating the connection after welding. But I'm just asked to figure out what caused the failure.
Also, I'm being asked to figure out why there was such low damping in...
Hi Berkshire,
No need to appologize! Help of any kind is greatly appreciated. Yes, the alloy is standard 6061 for both the duct and the rods. However, neither the assembly nor the connections were heat treated after the weld, so the strength of the rod near the connection is uncertain...
Hi Aviat:
- The materials engineer concluded it was fatigue, but there were no beach marks or necking where it occured.
- I appologize for using the term "tie rod" incorrectly. That's the term used in the design reports and such so have kinda gotten used to using it.
- The duct and the rods...
MTS is what I think of when you talk about vibration and test equiptment. Here's one of their pages for a shake table (or seismic simulator).
http://www.mts.com/Uniaxial/
Hi Everyone,
I've posted this question in the aerospace forum, but it seems more appropriate here. I'm investigating the low damping and failure of aluminum rods in a duct. The duct is used in a heat exchanger for an aircraft with high velocity air flowing through it so it'll have negative...
Thanks Greg...my team and I have already done a physical test of the system and determined the resonances and modes and so forth. Was just wondering if anyone has seen acoustic feedback contributing more to the dynamic response than pure configuration of the system and the resonance that results.
HI Steven(Sparweb)..thanks much for the replies. Sorry about the confusing description. The duct is used in a heat exchanger for an aircraft with high velocity air flowing through it so it'll have negative pressure inside. The negative pressure is sucking in the sides of the duct and would...
Hi everyone!
As a young engineer, I am turning to the experience of you older and wiser engineers. My situation is this: several tie rods that were used to negative pressure and thus buckling of a duct snapped during vibration tests. The tie rods were welded to opposing sides of the duct (a...
Hi Steven,
Thanks a lot for your suggestion. I'm beginning to think it is the same or similar rack as well. The rack is 55 or 54" tall and the foward (largest) load case is 9x. However, we are trying to do this analysis completely on paper and a simple finite element analysis (using...
Thanks Vince and Cory,
To answer your question Vince, the rack is to be used in a Coast Guard aircraft- so that should be Military not FAA. And yes, all the static and dynamic analysis for the rack and it's payload have been done. It's just that the rack was overweight (2x actually) and the...
Hi, I'm involved with an analysis project on a rack for an aircraft for my internship this summer. While I've completed most of the other parts of the dynamic analysis, I'm unfamiliar with this particular aspect of the analysis so I appologize in advance if any of these questions seem stupid...
