Abstract
Non-elastic audiofrequency vibrational modes in aluminium and other metals are suggested as a possible reason for the differences reported by various observers using large aluminium alloy bars (or disks) as gravity-wave detectors. Loading of suspended gravity-wave detector bars resulting from the gravitational attraction of the Earth is also sufficient to produce the small stresses required for the self-generation of audiofrequency sounds (acoustic emission) in materials. Both the non-elastic mode response and acoustic emission frequencies depend critically on the exact microstructure and/or residual stress state of a bar.
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Fitzgerald, E. Audiofrequency vibrations and gravity-wave detectors. Nature 252, 638–640 (1974). https://doi.org/10.1038/252638a0
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DOI: https://doi.org/10.1038/252638a0
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