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...
The premise of the question is also confusing. Aerodynamic pressure would certainly contribute to the stress in the skin.
However, I would expect a skin panel to primarily be sized by it's ability to take tension and shear loads as part of a box beam structure reacting wing bending loads (yes...
To be clear, I wasn't implying that they will try to "catch" anything on the moon. I'm just talking about their reusable boosters. I wasn't stating anything about their off-earth infrastructure at all.
What I'm saying is that their "stage 0" on earth, their launchpad, is the same infrastructure...
I see in the forums that each post now keeps track of a "reaction score" (the thumbs up). Based on how this is accumulated (the up/down arrows on the right of each post), it seems like this is intended to be a direct replacement to the "little purple star" system.
However, on the members...
Well, it really depends on what you are doing. As others have mentioned, it's a sensitive material to work with and I imagine most of the time critical loads are going to be dictated by boundary conditions and contact mechanics.
But in general, like all materials, pure tension or pure...
The most common way, in association with instrumentation, would be dimensional tolerance checks. You know what the design parts are supposed to measure / look like. If you have permanent deformation, things would have shrunk or stretched in a way that is measurable. Preload/alignment at joints...
Possibly because these forums are used primarily by seasoned engineers who tend to be.. how should I say... more dour/cynical/"realistic" about these types of challenges than the average "techie" or cult-of-personality type follower of SpaceX that you might see on social media or tech news...
It's definitely a welding related symbol. It looks to me like it would indicate a 1-sided V-groove weld. The double line indicates the other side is the EOP and the curve on top indicates the weld material is to be concave.
See...
I should note that superimposed on all of the charts in Section E is the following statement:
"NOTE: CURVE DETERMINED BY A SEMI-EMPIRICAL METHOD WHICH ASSUMES THAT THE BUCKLING STRENGTH OF THE VARIOUS PLATE ELEMENTS CAN BE ADDED TOGETHER TO OBTAIN THE ULTIMATE STRENGTH OF THE ENTIRE SECTION...
Hi, I have the manual Volume II you are looking for, it is the same number DAC 25-2066 (3-71).
There are curves for formed sections if you are searching for "compression panel allowables" which I assume you are based on your reference to Volume I B6.5.2.1.
Unfortunately I have no idea what the...
Failure of joints is general in what we call "transitional" regime... neither pure bearing or pure shear failure.
As mentioned it is commonplace to check bearing yield MoS.
If your joints are shear critical and you are worried about yielding of the shank in shear, you have bigger problems...
Circling back to the thrust links (an no, I'm not trying to kick Boeing when they are down):
The 777X thrust links are made from Titanium, although I'm not sure which alloy.
Most thrust links I have knowledge of, including those of the 777-200 and 777-300 are made from 15-5PH, so they...
For strain-life analysis you need to index the SWT (or some other method) correct e-N curve with the cyclically stable local notch strain range.
As you mention the material may have hardening/softening or relaxation properties which you can account for with a local notch strain analysis using a...
If I'm understanding what you're concerns are, you are saying the manufacturing process leaves the parts with a residual stress at certain details which will affect the mean stress during the duty cycle.
If that is true, the "proper" way to approach F&DT with the spectrum factor approach is to...
If this is an OEM hole on every production A/C, then why did whoever got hold of the OEM FEM has to make the hole in the model?
Likely the OEM doesn't put that level of fidelity in their model. They are probably using it as a loads model, and using some other analysis technique to substantiate...
