[AR] Re: Blank flare fittings
- From: Ben Brockert <wikkit@xxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Mon, 14 Oct 2013 17:21:38 -0600
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
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