Compression Question

[Richard Brekne]

Delwin D Fandrich wrote:

> ----- Original Message -----
> From: "Richard Brekne" <Richard.Brekne@grieg.uib.no>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: August 28, 2003 2:11 PM
> Subject: Re: Compression Question
>
> >
> > Its like you can
> > hypothetically speaking squezze the thing down next to nothing and it
> will
> > still shrink that 1-1.5 % given a drop 8 % drop in EMC.
>
> No, it's not like that at all. There are physical limits to everything.
> Long before you squeeze the thing down to next to nothing you will
> have...well, next to nothing. You certainly won't have anything remotely
> still resembling wood.
>

Well.. yes.. of course.. but then I was speaking hypothetically again...

>
> The compression ridges that develop in some soundboards are the result of
> the wood fibers in that part of the panel (specifically in the earlywood
> portion of the annular rings) being squeezed beyond their physical limits.
> They compress without catastrophic failure up to the point of their elastic
> limit, then structurally fail. That part of the panel, then, no longer
> follows the normal rules of expansion (or compression) and contraction (or
> tension).
>
> Del
>
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--
Richard Brekne
RPT, N.P.T.F.
UiB, Bergen, Norway
mailto:rbrekne@broadpark.no
http://home.broadpark.no/~rbrekne/ricmain.html
http://www.hf.uib.no/grieg/personer/cv_RB.html