String Breakage

[Marcel Carey]

If I remember correctly, this piano is a Disklavier. It could have
been played non stop for so long that the strings are just fatigued.
But still, this doesn't explain why they would break at the bridge...

Marcel Carey, RPT
Sherbrooke, QC

> -----Original Message-----
> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On
> Behalf Of Dean May
> Sent: 10 février, 2004 20:29
> To: Pianotech
> Subject: RE: String Breakage
>
>
> Good points, Don. But aren't the Yamaha pianos a higher
> tension scale design
> that brings the wire closer to its elastic limit? This
> would seem to me to
> push the strings past the endurance limit on high tension
> Asian pianos. It
> also accounts for why you tend to see more string breakage
> in ten year old
> Yamaha/Kawai pianos that are played heavily.
>
> Dean
>
> Dean May, PE            cell 812.239.3359
> PianoRebuilders.com   812.235.5272
> Terre Haute IN  47802
>
>
> Work hardening or "cold work" only occurs when a material
> is plastically
> deformed.  This is basically when you bend a material and
> it doesn't return
> to its original shape.  For example, you can bend the end
> of a paper clip a
> little and it will return to its original position.  This
> is "elastic"
> deformation and will occur over and over as long as you
> don't go past the
>
> Don A. Gilmore
> Mechanical Engineer
> Kansas City
>
>
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