[TowerTalk] Response to R for math

[Stan Griffiths]

>  The idea does beg an interesting question though, how does one
> calculate the bending strength of a mast made of two different materials? For
> example, what if I have an aluminum mast with a steel insert inside of it? How
> does the bending moment distribute itself between the two materials. In this
> case I suspect it depends on the Youngs modulus of the two materials (stress/strain).
> The stiffer material (not necessarily the stronger material) will take most of the
> load (kind of like two concentric springs with different Hook's constants) when subject
> to a bending moment.
>
> I recall getting a pretty good grade in my statics course in college, but thats about all I
> remember. I will definetly have to get out a book to figure out this one. Any other
> mechanical mavens out there who know the answer?
>
> 73 de Mike, W4EF........

I'll take a guess . . .  I would find the bending moment each would stand by itself and add the
two together.  This would assume a fairly tight fit between the telescoped tubes.  I am open
for challenges to this idea . . .

Stan  w7ni@teleport.com




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