I am interested in objects which resonate or ring for as long as possible. In particular, I am interested in Crotales (https://en.wikipedia.org/wiki/Crotales), and if it is possible to make a longer ringing version DIY. I would really like to hear suggestions/comments about the physics involved here!
I guess the three important parameters here are 1) material 2) shape 3) manufacture process.
Material. Many percussion instruments are made of bronze or brass. Are these the best materials? Or is there another metal which will do as well.
It seems that the two most used shapes are either flat plates/circle (e.g. thundersheets or crotales) or bell shapes. I am told that the increasing diameter of bells creates standing waves of decreasing frequency around the perimeter of the bell. However, I am mostly interested in a flat objects.
I made a DIY cymbal out of a circular very thin steel sheet. However, it hardly resonated at all. Do rims (either outside or in the center) create more resonance? Would stretching the metal in some way help it to resonate?