Youngs Modulus for Piano wire

John Delacour JD at Pianomaker.co.uk
Sun Aug 27 11:31:53 MDT 2006


At 6:35 pm +0200 27/8/06, Ric Brekne wrote:

>Hi JD.
>
>Well, I ran into a paper which described a fairly sophisticated 
>measuring experiment as part of a university project for a student. 
>Its results are 1,824 * 10^11 N/mm^2.
>
>Actually, I've run into 4 distinct numbers. roughly
>47,000 lbs / mm^2,
>45,000 lbs / mm^2
>41,000 lbs / mm^2
>31,000 lbs / mm^2
>
>For my purposes I can for the moment settle on 45,000 but I would 
>like to get some more input on the matter.

You'll be miles out if you settle on that number!  Never mind about 
sophisticated measuring.  You're talking about Young's Modulus, so 
presumably you know what that is and how it is measured, and once you 
know that you can do the job quite accurately in 20 minutes including 
thinking time. The higher your house the more accurate your result, 
and you have the advantage over me since you probably have wooden 
walls and can more easily knock a nail into them. :-)  I think that's 
enough clues.

Why do you want to know Young's Modulus for cast steel wire?  I know 
when it's useful to me and I wonder if you have the same uses for it.


JD

Away with books!
   -- Marcus Aurelius Antoninus


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