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waqasyuri
waqasyuri asks:
Q:

Can sound resonance be used to crack or fracture metals?

The basis for this question arise from the proposed laws of resonance which state that resonance is forced oscillations or vibrations that can amplify the magnitude of vibration of any object thus causing cracks to appear and sometimes even total failure of the object to be observed?
In Topics: Science fair
> 60 days ago

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Expert

greenprof2
Nov 12, 2011
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What the Expert Says:

Yes, of course, but conditions must be right. You probably have seen those commercials where a singer produces a frequency that is just the right frequency of a wine glass and it shatters. Remember that sound is a wave, and waves can occupy the same space at the same time (it's called interference). Because of this, the sheer amount of sound at any given time will not increase the chance, but actually prevent resonance from occurring because the sound will be less pure. Most sounds aren't pure tones sticking to one frequency. If a metal object resonates, say, at 500Hz and you start talking, you might hit 500Hz occasionally (you'd have a high-pitch voice), but never for more than a short time. Damping also plays a role and absorbs energy. It the metal object is placed on a carpet it will lose energy quickly. The carpet damps the vibrations. Hope this helps.

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