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Originally Posted by Robert Rowe ............ This is because the metal has experienced a "molecular re-arrangement" or "trauma", and the brass-alloy has a "memory"... hence, the "wavy lines" and such evidence as we see. The metal has been "stretched" and is trying to return to it's earlier configuration. She related stories about doing repairs on damaged horns for their tests and exams -- everything corrected and "play-tested" to satisfaction, only to find the horn "out-of-whack" the next day, or a few days later............ |
Exactly, but a metal can be stressed (stretched)
beyond the point where it will return to its original shape. This point is referred to as the 'moment of elasticity'. If stressed beyond that point, the metal will be permanently disfigured.