Re: Telescope mirrors under tension.

From: redbelly (redbelly98_at_yahoo.com)
Date: 03/18/05 

Date: 18 Mar 2005 10:58:55 -0800

Robert Clark wrote:
> ... Perhaps Landis is considering the materials that
> might be used for a space cable such as steel or carbon fibers for
> instance, where the tensile strength is larger, since he makes a
> comparison to the lengths that could be achieved with current
materials
> for a space cable.

I am surprised by the statement that tensile strength is larger for
steel or carbon. Have you looked up the values?

The force in a typical atomic bond gets ever stronger as the atoms are
compressed together.

But if the atoms are pulled apart, the force will eventually get weaker
(after initially getting stronger for small tensile displacement of the
atoms). Unless there is something unusual about the bonding, that
would mean tensile strength is weaker than compressive strength in most
materials.

Mark

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