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Strength and Fatigue Performance of Lug (FEM presentation)

Strength and Fatigue Performance of Lug (FEM presentation)

Strength and Fatigue Performance of Lug (FEM presentation)

(OP)
Hi,

I found the following document online:
http://www.agingaircraftconference.org/all_files/43/43c/99_ppt.pdf

Now, I am thinking about the classical (handcalc) lug analysis under oblique load as per BRUHN Method § D1.11. We may also consider rework in our dimensions. But, I believe that we may be too much conservative by adding our load with the radial load due to press-fit effect. Because, by loading our lug we are actually relieving the load due to press-fit at load application direction (at least).

I guess that the outcome of the above presentation confirms my statement. Please let me know about your experience?

Thanks,
A.A.Y.
 

RE: Strength and Fatigue Performance of Lug (FEM presentation)

i think the presention shows (i scanned over the static portion) shows the effects of excessive bushings.  i don't see why a 0.75" dia bush is superior (from a lug point of view) to an un-bushed hole ... possibly this size of bush has a nice stable wall, supporting the lug better; the larger bushes remove too much material, weakening the lug.

i think superposition is a valid approach, i don't see anything here that proposes an alternative.  from my experience, be carefull generalising anything about lugs !

RE: Strength and Fatigue Performance of Lug (FEM presentation)

looking at the presentation again, i wonder if forcemate would have a negative impact on static strength as the interference is much higher than press fit.

RE: Strength and Fatigue Performance of Lug (FEM presentation)

(OP)
Hi rb1957,

Thank you for your response. I am agree with you, I think that superposition is O.K. even if it might be too conservative. As you mentioned, by generalization we may take an unsafe approach.

A.A.Y.

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