Re: Telescope mirrors under tension.
From: redbelly (redbelly98_at_yahoo.com)
Date: 03/13/05
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Date: 13 Mar 2005 07:33:15 -0800
Robert Clark wrote:
> In this article Geoffrey Landis proposes builing a space tower using
> pressurized structures:
>
> THE TSIOLKOVSKI TOWER RE-EXAMINED
> Journal of The British Interplanetary Society, Vol 52, pp. 175-180,
> 1999.
>
http://www.aeiveos.com/~bradbury/Authors/Engineering/Landis-GA/TTTR.html
>
> He notes that typically materials have higher failure or ultimate
> strength in tension than in compression ...
Funny, I could have sworn it was the other way around.
Fused silica glass is about 20x stronger in compression than in tension
(1100 MPa vs. 50 MPa). See
http://www.sciner.com/Opticsland/FS.htm
and look at "compressive" and "tensile" strength on that page.
Mark
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