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Craig Hair
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Same concept. There is the proof that we are actually stretching the steel strings (Peter, where are you?) smile

Pretty amazing to watch that thick a steel bar actually stretch before snapping. Really neat.

Last edited by Rick_Parks; 05/31/19 06:30 PM.

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Not what I expected, and I've seen quite a few of these tests in engineering school.

Check out this torsion video of a steel bar:

https://www.youtube.com/watch?v=94Bu1DiHOoM


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Rick, I'm here. 😎

Cool video. Yes, stretching just prior to snapping. So, one kip is 1000 lbs.

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That is interesting. However, piano strings are a different grade of steel. When they break, there is a noticeable thinning of the wire at the point of breakage.


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BDB,
No analogy is perfect; however, the closeup at 4:35 does show necking


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Have these slomo guys done a video with piano wire?

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Originally Posted by P W Grey
Rick, I'm here. 😎

Cool video. Yes, stretching just prior to snapping. So, one kip is 1000 lbs.

Pwg

Peter,
Piano wire is stretching the whole time--- just as this metal was stretching... Notice the marker on the machine- the metal is being stretched the entire time. It deforms the greatest just before breaking. Which would be why we would not want to "stretch" the string too sharp, as major deformation takes place (degrading string tone).


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Slightly off topic, but when I was a kid, I used piano wire for control linkages in model airplanes. I noticed something interesting, which is that if you heat some types of piano wire to red heat with a torch, then remove the torch, you will see the wire cool from incandescent to black again, just as expected. But if you watch closely, right after the wire goes dark, you will see it briefly go red hot again before resuming cooling. I'm guessing this is latent heat of crystallization being released.

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Originally Posted by BigIslandGuy
Slightly off topic, but when I was a kid, I used piano wire for control linkages in model airplanes. I noticed something interesting, which is that if you heat some types of piano wire to red heat with a torch, then remove the torch, you will see the wire cool from incandescent to black again, just as expected. But if you watch closely, right after the wire goes dark, you will see it briefly go red hot again before resuming cooling. I'm guessing this is latent heat of crystallization being released.

Did the same but missed the red resuming. I wonder if this latent heat is a factor why some heat quenching processes are two stage?
Ian


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