An insurance cut is an additional trim-out of material made after the removal of initially assessed damage boundaries.
Usually an insurance cut is specified as 0.040".
There are several reasons for insurance cuts to be specified in a repair plan:
If damage such as corrosion or gouges /...
I don't think you want to look at Niu, Megson, or Bruhn for this. Instead look in any Strengths of Materials / Mechanics of Materials Textbook, look in the index, and find where they cover topics like "moment of area for composite shapes", "parallel axis theorem" etc.
These methods generally...
Just to clarify, are you only interested in the secondary bending moment specifically? Not to be pedantic, but what Bruhn works down to is the location and magnitude of the maximum moment, or the formula for the moment at and point along the span. But these would be for the total moment due to...
This is true, crippling is a failure stress, although to be crippling critical you need an L'/rho usually <20 and this is really only a term used for failure of thin-walled members of stiffened shell structures.
That is one form of post-buckled strength but not the only one. Flat plates in...
Alteon was a company that did structural analysis training for engineers and was acquired by Boeing. So it's a Boeing company but they have a lot of training slides/notes out there that are not proprietary material.
In this case I just did it graphically. Use the stress-strain curve, draw a...
In that case the reference data I mentioned is not going to help you.
It sounds like this is not really a question of how to do fatigue analysis, but rather what you're asking is effectively:
"How do I develop an operational loads envelope and spectrum for this UAV?"
Usually this would be...
Well there is quite a bit of data out there regarding gust and maneuver exceedance curves for commercial aircraft.
Just try searching: "dot/faa statistical loads data for commercial aircraft"
For example: https://apps.dtic.mil/sti/tr/pdf/ADA378308.pdf
Theoretically if you have a CFD that...
I went through and calculated critical interfastener buckling strengths based on the references I outlined above and the info you provided. Here are the results:
1. Peery using the Secant Modulus corresponding to Sigma_0.7 (MMPDS-2023 Figure 3.2.4.1.6(i)) on a tensile stress-strain curve to get...
So there are a few things that can be a bit confusing about general interfastener buckling methods. What you'll find is that they typically rely on indexing column buckling curves from Euler-Engesser relations rather than starting from derived plate buckling formulas from Gerard or Kuhn, etc...
In my experience, match drilling and it's counterpart match-forming are generally not specified in much detail on a repair plan / repair instruction or installation instructions. As a stress liaison / repair engineer you learn to tow a balance between being specific enough in your instructions...
I understand the caution with this data and I also would not necessarily recommend posting the SB in a thread like this. Having said that, the SB is mandatorily incorporated by FAA final rule via AD and it is standard practice for the FAA to provide all data necessary for compliance with the AD...
Respectfully, I think I understand the problem. OP said:
He's saying the O/D of the bearing is set into an aluminum housing and he wants to know if there should be a steel sleeve press fit into the housing to act as a wear layer between the OML of the bearing outer race and the inner face of...
RB, the source of this graph is originally from Rabinowicz who "wrote the book" on wear, so to speak. The source of the figure from Norton is actually from the Wear Control Handbook by MB Peterson and Wo Winer. I have done some checking to make sure it is correct.
I think the thing to keep in...
There are some models that cover fretting fatigue and abrasive or adhesive wear. I'd have a look through some of the classics. I have done these type of calculations to inform inspection requirements/schedules for pin/bushing interfaces before.
A good reference is Robert Norton's "Machine...
