> 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
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|