Re: Uses of Bulk Nano Materials (was beanstalks)
From: N:dlzc D:aol T:com \(dlzc\) (net_at_nospam.com)
Date: 06/13/04
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Date: Sat, 12 Jun 2004 21:02:54 -0700
Dear Ian Stirling:
"Ian Stirling" <root@mauve.demon.co.uk> wrote in message
news:40ca67aa$0$530$ed2619ec@ptn-nntp-reader02.plus.net...
> In sci.space.policy "N:dlzc D:aol T:com \(dlzc\)" <N: dlzc1 D:cox
T:net@nospam.com> wrote:
...
> >> Why zero thermal expansion?
> >
> > The stranding exposed to the Sun will get longer, and the other side
get
> > shorter. This will increase internal stresses, as the cool side will
carry
> > the majority of the load.
>
> The cables being talked about are microscopically thin.
> There is essentially no temperature gradient.
"essentially no" is not "identically no". Kevlar is a horrible conductor
of heat. There is a temperature gradient, and there will be differential
stress. And as you point out, "kevlar is just an example".
David A. Smith
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