Material strength
Material strength
(OP)
I have a small "L" bracket made from 2024-T3 QQ-A-250/5 at .13 thick each leg. The drawing calls out 2024-T351 QQ-A-200/3 in the latest revision. Is there much difference between the strengths of the 2 materials? All the other dim's are the same. What do you think?





RE: Material strength
Not the same animal.
If the clip is supposed to be made from an extruded angle, then it can be 200/3. That would be a cut-to-length & deburr before drilling fabrication process.
If instead the clip should be made from sheet, then it has to be bent first. Consider the miniumum bend radius of a 0.13 thick SHEET... Wow, that's at least 0.38".
I'm pretty sure you should do this with an extrusion. The drawing is probably correct. Why would you try to make this bracket by bending sheet?
STF
RE: Material strength
RE: Material strength
Could it have been machined from a thick plate ? which would be very significant if it was meant to be an extrusion. I would expect an extrusion would have a much smaller bend rad than a s/m part (possibly not if the s/m was formed on O or W condition and heat treated.
in any case the part is not to B/P so it needs an engineering buy-off.
another day in paradise, or is paradise one day closer ?
RE: Material strength
My favorite -not- was an aluminum tube bent into a shape like an unused staple. The making company charged a huge amount because it was called out 6061-T6, but the bend radius was a bit too small. They bought T6, annealed it, formed it, and then re-heat treated back to -T6. The tubing was just a grab handle for a box; the radius didn't matter much. But at least we got rid of sensible checkers.
RE: Material strength
What seems to be missing from Your side is an extruded profile number, such as: AND10134-xxxx, 'corporate profile #', etc.
Regards, Wil Taylor
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