And if you need a finer definition of harmonics and get to a level over your head mike its when the vibrations reach a frequency that cause failure at that intensity in different areas of the object
har⋅mon⋅ics /hɑrˈmɒnɪks/ Show Spelled Pronunciation [hahr-mon-iks] Show IPA
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–noun Music. 1. (used with a singular verb) the science of musical sounds.
2. (used with a plural verb) the partials or overtones of a fundamental tone. Compare overtone (def. 1).
3. (used with a plural verb) the flageoletlike tones of a string, as a violin string, made to vibrate so as to bring out an overtone.