Stress analysis for a lug under interference fitting
Stress analysis for a lug under interference fitting
(OP)
Hi Guys,
We do lug analysis under oblique load as per BRUHN Method § D1.11 (classic approach). We also consider rework in our dimensions. Now, I would like to know that do you combine press-fit effect too? or not?
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). What do you think?
By the way, there is good presentation at:
http:/ /www.aging aircraftco nference.o rg/all_fil es/43/43c/ 99_ppt.pdf
Thanks,
A.A.Y
We do lug analysis under oblique load as per BRUHN Method § D1.11 (classic approach). We also consider rework in our dimensions. Now, I would like to know that do you combine press-fit effect too? or not?
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). What do you think?
By the way, there is good presentation at:
http:/
Thanks,
A.A.Y





RE: Stress analysis for a lug under interference fitting
RE: Stress analysis for a lug under interference fitting
i agree (for whatever that's worth) with superimposing the applied load on top of the press-fit.
RE: Stress analysis for a lug under interference fitting
from the presentation, i think it's dangerous to generalise about lugs. This is a specific lug geometry, with steel bushes. The residual stress field due to interference is highly dependent on the local geometry. the local stress field due to loading is (obviously) highly dependent on loading direction. the interaction between geometry and loading is pretty unique for each lug.
I thought it was "bad" practice to repair bores in Al with Steel bushes. i thought part of the point of a bush was to be a removable, an easy way to repair a damaged bore. if the parent material is Al and the bush is Steel, then the bush will bear into the parent material; if the bush is Al then the bore will bear into the bush, and replaceing the bush should repair the hole (without affecting the parent lug).