Abstract
A method for deriving the dispersion law for I-section beams is presented, which explains discrepancies between experiment and the Timoshenko beam equation. The discrepancies are accounted for by allowing the flanges of the model beam to vibrate. The method is confirmed experimentally for different I-section shapes. Application of viscoelastic damping material to the flanges is found to have only small effects on the dispersion law, but flange vibration results in increased loss factors at higher frequencies.
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