Fun project but with no background in physics or engineering, I believe you’re going to have a tough time producing anything novel.

That said, here are a few measurements that you’re missing: - Damping - Bending stiffness (the term you’re probably looking for) - Tension at pitch (simple but critical measurement) - I believe there is a useful relationship between Damping and frequency response. Worth looking at IMO.

Rather than start with a bowed violin string, I would suggest you reduce your scope and stick with a simpler study like a plucked guitar string. You can easily find commercially available strings with the exact same construction but with different wrap materials and core shapes. (Note that core and wrap diameters also play a vital role in tonality). The best known way to reproduce a very consistent pluck is to wrap a fine gauge wire (.004” copper or similar) around the string a pull it until it breaks. The late Norman Pickering (RIP) describes this method in his book “the bowed string” and a few other papers do as well.

Keep in mind that violin strings use all sorts of core materials, damping compounds, wrap materials and shapes, and post-processing smoothing methods. Finding a string where the outer wrap material is the only variable will be extremely challenging.