tensile strength formulas

[Brian Trout]

Hi Jeff, Hi Diane,

I'm no math whiz by a long shot, but I looked up some figures.

According to my sources:

1 pound = 4.44822 Newtons

1 square inch = 645.16264 square millimeters

1 Newton = 0.22481 pounds

1 square millimeter  = .00155 square inches

 If I use the above figures, I'm thinking that:
                       1newton / sq. mm  = 0.22481 lbs / 0.00155 in.

or reduced further:
                        N/mm2  = 145.03871 lbs / sq. in.

To go the other way:

                        1 lb / sq.in.  =  4.44822 Newtons / 645.16264 sq. mm

or reduced further:
                        lbs / sq. in  =  0.0068947 N / mm2


Help me out math types.  Am I on the right track?  Did I screw it up
completely?

Jeff and Diane, please don't take this on my above guesses and speculations.
I'm trying to provide what limited ideas I have.  I always wanted to take
more math courses, but haven't been able to yet.  I wouldn't want to be the
cause of major catastrophe!!!!

Good luck with your project.  I look forward to any responses, myself.

Have a good day.

Brian Trout
Quarryville, PA
btrout@desupernet.net


----- Original Message -----
From: Diane Hofstetter <dianepianotuner@hotmail.com>
To: <pianotech@ptg.org>
Sent: Saturday, October 16, 1999 1:32 PM
Subject: tensile strength formulas


> List,
>
> Can you help us convert the "N/mm2" description of tensile strength to
> "lb./in2" ?   We are re-restringing a Viennese grand (Anton Pokorney)
> c.1850, which appears to have been "foreshortened" around the turn of the
> century.  (Several clues lead us to this conclusion including evidence
that
> the case has been altered, that the plate has been cut, a notation in an
> inaccessible location dated 1903 and round, rather than oval, tuning
pins.)
> The piano is straight strung, the bass strings are brass wound uni-chords
> and steel wound bi-chords. We are exploring several types of wire and find
> some analayzed with the formula N/mm2 and others with lb./in2, so it is
hard
> to compare them.
>
> We thank you for any light you can shed on this for us!
> Jeff Williams
> Diane Hofstetter
>
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