Hi Luis,
I believe the method they are using to determine
stiffness or actually modulus of elasticity of the
balsa wood is to find out at what load buckling
occurs. Then you can use Eulers formula for buckling
of columns:
P=n^2*Pi^2*E*I/L^2
Where P= buckling load
n= end constaints factor
Pi=3.14
E= Modulus of elasticity
I= Moment of inertia
L= length
Note: No deflection measurement is needed.
Hope this helps,
Kurt
--- Luis Alvirez <ljacamgd_at_hotmail.com> wrote:
> There is a method to calculate balsa stiffness, by
> John Taylor (INAV
> 108, p11) for which you have to cut several strips
> from a balsa sheet.
> Also Bernard Hunt did a study for balsa sheets. Both
> require (among
> other tings), the deflection of the sample. Lately,
> I was advised that
> in Tim Goldstein's Indoor Duration site there is a
> program that saves
> you the calculations, but it does not ask for
> defection. Anybody there
> could help me to understand how could this be
> calculated without that
> figure?
>
>
>
>
>
Kurt Krempetz
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Received on Fri Jan 13 2006 - 18:47:11 CET