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<DIV><FONT face="Bookman Old Style" size=2>I don't think this degree of plastic
deformation stands in the way of the "strings don't stretch over the long term"
idea. First, keep in mind the amount of stretch cited here. Even at
the 300 pound tension, the plastic deformation was given as about 5
thousandths of an inch. Maybe significant in some way, but it sure
wouldn't account for any "winding up of wire on the tuning pin." I don't
know the pitch change for an increase in wire length of 5 thou for 17 ga
wire, but maybe our scaling guys can tell us. I would enjoy
knowing.</FONT></DIV>
<DIV><FONT face="Bookman Old Style" size=2></FONT> </DIV>
<DIV><FONT face="Bookman Old Style" size=2>More to the point, when did this
plastic deformation occur, i.e., how long was the wire left
tensioned? I tried wading through this study, but didn't find the methods
outlined very well. It appears the wires were only tensioned for a short
period (less than a day). In other words, this plastic deformation of
music wire occurred <U>as the wire was initially brought to tension</U>, and
stayed there for the duration. It does not conclude that the wire
continued to deform over any length of time.</FONT></DIV>
<DIV><FONT face="Bookman Old Style" size=2></FONT> </DIV>
<DIV><FONT face="Bookman Old Style" size=2>So, for our purposes, this study
seems to suggest that as we chip or raise pitch, there is bound to be some
plastic deformation, but that once tensioned, no more deformation occurs over
the long-term. So, the theory that strings stretch over the long-term does
not seem to be supported by this study/information.</FONT></DIV>
<DIV><FONT face="Bookman Old Style" size=2></FONT> </DIV>
<DIV><FONT face="Bookman Old Style" size=2>William R. Monroe</FONT></DIV>
<DIV><FONT face="Bookman Old Style" size=2></FONT> </DIV>
<DIV><FONT face="Bookman Old Style" size=2></FONT> </DIV>
<DIV><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p><FONT face="Bookman Old Style"
size=2>SNIP</FONT> </o:p></SPAN></FONT></DIV>
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<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">It is important to
understand though that some plastic deformation does occur before Yield
Strength, though not really appreciable. If you’re really bored check out this
site: <A
href="http://books.google.com/books?id=dVQOAAAAYAAJ&pg=RA7-PA319#PRA7-PA335,M1">http://books.google.com/books?id=dVQOAAAAYAAJ&pg=RA7-PA319#PRA7-PA335,M1</A><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Scroll down to page
336, for example. You will find a strain table for 17 gauge wire. At 100 lbs
tension the wire elongated .0122 inches. When they took the 100 lbs off it had
a permanent set (i.e., plastic deformation) of .0002 inches. When they got up
to 300 lbs the permanent set was .0047 inches. At 422 lbs the wire sample
broke (ultimate strength). <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Mike, do you have a
reference we can look at that says differently? The reference above was
printed in 1918 and perhaps “modern” piano wire would be different.
<o:p></o:p></SPAN></FONT></P>
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style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
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<DIV>
<P class=MsoAutoSig><B><FONT face="Bradley Hand ITC" color=navy size=6><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 22pt; COLOR: navy; FONT-FAMILY: 'Bradley Hand ITC'">Dean</SPAN></FONT></B><FONT
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<P class=MsoAutoSig style="MARGIN: 0in 0in 0pt"><U1:PERSONNAME
u2:st="on"><st1:PersonName w:st="on"><FONT face="Times New Roman" color=navy
size=3><SPAN style="FONT-SIZE: 12pt; COLOR: navy">Dean
May</U1:PERSONNAME></SPAN></FONT></st1:PersonName><FONT color=navy><SPAN
style="COLOR: navy">
cell 812.239.3359
<o:p></o:p></SPAN></FONT></P></DIV></DIV></BLOCKQUOTE></BODY></HTML>