[CAUT] String stiffness questions

[RicB]

Thanks Alan... I was beginning to think I wasnt going to get any 
response on this at all.  No, its not the Young modulus I'm after.  I 
just need to know how to find this constant <<K>> which keeps coming up 
in formulas about inharmonicity and string stiffness.  I also need to 
know if it changes along with the type of string material used.

Specifically... in both Nossamans and Overs spreadsheets for scaling 
there is a formula for figuring out string stiffness in which a constant 
is used... and I have no idea where this constant comes from or what its 
actual meaning is... and hence have no idea if it remains the same for 
Pure Sound wire as compared to Rosslau for example.

On the side.... I also am working on using the scale tensions that 
result from any given design to determine a basic downbearing picture 
for given string offsets and building that into the spreadsheet.  I 
already have that math in place.... so  the addition of one more specs 
column (for string offsets) and a couple calculation columns will yield 
downbearing in Kg for each unison... and a graph that shows how the 
scales downbearing looks over the entire soundboard.... Thought that 
might be handy :)

Cheers, and thanks for reminding me of the Roberts source... I dont have 
his book... but There are those articles in the journal.

RicB


    Hey Ric,

    Are you referring to Young's Modulus (Y)? Have you checked out The
    Calculating Technician by Dave Roberts? I think there is info in his
    book
    that might be useful.

    Alan


    -- Alan McCoy, RPT
    Eastern Washington University
    amccoy at mail.ewu.edu
    509-359-4627

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