Re: [ATM] Flex Software

["Bill Kelley" <flex@commspeed.net>]

Bob is right.  If I remember correctly Poisson's ratio for plate is about 
1.22, for Pyrex about 1.24.  Since the figure is created by adjusting the 
tension and testing i.e. star testing, zonal, auto-collimation, etc., the 
required tension to optimize the optic may be slightly different for 
different materials. Alternatively, if the tension can be applied as 
calculated by flex, the optic will have nearly the correct shape.
For precise tensioning, Alan Adler has, but has not published a flex program 
that requires entering the Poisson's ratio for the selected material. An 
example might be carbon fiber composite mirrors.

Bill Kelley


Subject: Re: [ATM] Flex Software


> Suspect that the difference between Pyrex and plate glass isn't that big 
> for
> flexing.  The article, I think, also expects fine tuning due to inability 
> to
> get an accurate thickness as well as the change of thickness over the area
> of the mirroro.
> Bob May
> bobmay@nethere.com
> http://nav.to/bobmay
> http://bobmay.astronomy.net
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>
> 


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