[AR] Re: Blank flare fittings
- From: George Herbert <george.herbert@xxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Mon, 14 Oct 2013 20:10:05 -0700
Looking around for more data on this, interested because Al is used
extensively for seaplane and floatplane design without SCC issues. And
they get scratched...
(Amusingly - first ref I find on google, halfway through the paper, I stop
and laugh, because they included (and cited) a diagram I did on Wikipedia
describing Metacentric height on floating objects...).
On Mon, Oct 14, 2013 at 4:21 PM, Ben Brockert <wikkit@xxxxxxxxx> wrote:
> On Mon, Oct 14, 2013 at 5:01 PM, George Herbert
> <george.herbert@xxxxxxxxx> wrote:
> > 2024 is SCC sensitive? Or did you have another alloy in mind?
>
> "Alloys 7079-T6, 7075 -T6 and 2024 - T3 contributed to more than 90%
> of the service failures of all high-strength aluminum alloys."
>
> http://www.keytometals.com/article17.htm
>
> Alcoa says it's much better in -T351 and -T851. Either way, anodizing
> the parts after modifying them would be a fairly easy step to take if
> you expect them to be in a corrosive environment. For the typical life
> cycle of land-based amateur rocket projects it probably won't be an
> issue.
>
> Elon: "First of all, it is important to appreciate that the
> DARPA/SpaceX board finding – which was unanimous by the way, there was
> no dissension – felt that the most PROBABLE cause was stress corrosion
> cracking of an aluminum nut."
>
> Ben
>
>
--
-george william herbert
george.herbert@xxxxxxxxx
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