Re: ATM AO and Youngs Modulus for glass

[Johan Vanbeselaere <jvb@digilife.be>]

> 
> For formules for thin disk, you should state how the disk is supported !
> I guess it's on several points, you can easily find formules for disks
> on continuous rings, but
> on several points FEM should be used.
> 
> For instance :
>  a plate simply supported at the edge and with a central
> force f follows the law
> 
> w(r) = f.[(R^2-r^2)/2-r^2.ln(R/r) ]/(8.PI.D)
> 
> where R is the outer radius of the plate. D=E(t^3)/12(1-v^2) with t the
> thickness.
> 
For a bimorph mirror you will need the curvature calculated because
that's being
steered with a bimorph mirror. I guess that's the second derivative of
the height function ?

Johan Vanbeselaere
ACG vzw Belgium