On Thu, 07 Aug 2008 20:00:01 -0500, dpb <none@[EMAIL PROTECTED]
> wrote:
>Tom Watson wrote:
>> On Thu, 07 Aug 2008 20:38:33 -0400, Tom Watson <notme@[EMAIL PROTECTED]
>
>> wrote:
>>> It's like a woodworking application of the uncertainty principle.
>>
>>
>> Please do not respond to me with posts that explain the workings of
>> the actual uncertainty principle.
>>
>> It was an attempt at humorous analogy.
>...
>
>:)
>
>Being a nuclear engineer/physicist by training, I'll refrain (w/
>difficulty)... <vbg>
>
>The actual is owing to the general test layout and the physics of plate
>bending as noted in an earlier thread. If the material were actually
>entirely uniform as we all know wood isn't, the bending stresses would
>be perfectly symmetric and a solid piece of the same dimensions would
>bend then break right down the middle.
>
>There's a small effect at the edge owing to the discontinuity of the
>fibers across the joint but w/ reasonably straight-grained wood it's a
>secondary issue. The glue joint is, in fact, stronger than the breaking
>strength and which side the test sample breaks upon depends on which
>board has the weaker point flaw assuming even loading.
>
>If you look at some of the web sides that have the "sagulator"
>calculators for beam loading, some of them also have stress/strain
>curves associated with them for various loading patterns. For
>simply-sup****ted ends and point load in the middle, the bending moment
>diagram is linear from the endpoints to the middle, then decreases in
>the other direction to zero again at the other edge. Something like
>
> Load
> |
> \|/
> ------------- Beam/panel
>
> \ / -- 0 (zero bending moment)
> \ /
> \ /
> \ /
> \ /
> \ / ------ M (max bending moment)
I am mindful of your explication.
My point, and I would say, my premise, is that the act of gluing
introduces some deterioration to the fibers along the line.
The test that I have planned should be interesting in either proving
it out to a degree that it becomes a theory, or putting the idea to
bed.
I would be disinclined to bring Heisenberg into this discussion beyond
saying that every time that I would try to look at my experiment the
parameters would change - and that would piss me off.
Regards, Tom.
Thos. J. Watson - Cabinetmaker
http://home.comcast.net/~tjwatson1/
tjwatson1ATcomcastDOTnet
|
