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#2026478 - 02/03/13 06:44 PM E-modulus and yeld stretch
Olek Online   content
7000 Post Club Member

Registered: 03/14/08
Posts: 7065
Loc: France
Hello,

I have read here more than once than the e-modulus of the wire was unrelated to iH, and I dont understand .

Is the e-modulus of American wire similar to Roslau wire ?
Is the e-modulus of Paulello type O similar to the one of other types ? (is the carbon content modifying significantly the Young modulus ?)

I made an experiment measuring the partials of a Paulello string mounted and using a formula to compute the e-modulus from the iH.

It gave 1.96 it is supposed to be 2.05 for Roslau.

Pure sound is 1.87 (N/m2)

I am a little lost there, it sound simple that a less stiff string is providing less iH, I cannot see why it should not be the case.

Any confirmation or something ?

The metal used is different when making the different Paulello wire, but the M type, (was said) plus a different way to make the wire.








Edited by Olek (02/03/13 07:18 PM)
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Isaac OLEG - http://picasaweb.google.fr/PianoOleg pro

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#2026710 - 02/04/13 05:09 AM Re: E-modulus and yeld stretch [Re: Olek]
Olek Online   content
7000 Post Club Member

Registered: 03/14/08
Posts: 7065
Loc: France
Sorry to be confused there. I will record L modes on type O wire and Roslau wire on a small grand I have there

Here is the experiment done to find the E modulus on type 0 wire (precision was said to be 15% method : Hans Velo) :

https://docs.google.com/file/d/0B6GjQDkF_AMQbV9MOWlSQnUteEk/edit?usp=sharing
_________________________
Isaac OLEG - http://picasaweb.google.fr/PianoOleg pro

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