[AR] Re: Project update - propellant tank hydro tests
- From: Nathan Mogk <nm8911@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Fri, 22 Nov 2013 09:21:52 -0700
There is a rule of thumb which you can use to predict a little bit, along
with a reiteration of Henry's statement about there being no better method
than testing for a particular alloy. Face-centered cubic crystal structures
tend to not become embrittled at low temperatures, since there are a lot of
nice, low energy slip planes. Aluminum and some stainless steels fall into
this category. Other steels are much more hit or miss, and I think in
general that the higher the carbon content, the more likely it will become
brittle at low temperatures.
On Thu, Nov 21, 2013 at 10:18 PM, Keith Henson <hkeithhenson@xxxxxxxxx>wrote:
> On Thu, Nov 21, 2013 at 8:34 PM, Henry Spencer <henry@xxxxxxxxxxxxxxx>
> wrote:
>
> snip
>
> > You could always dunk a few in LN2 for a minute, and then apply a hammer
> > and see what happens!
>
> That's a very good suggestion. It's worth remembering that loss of
> ductility due to cold contributed to the sinking of the Titanic.
>
> Keith
>
>
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