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This article discusses an experimental study of the Timoshenko beam theory, focusing on the existence of a critical frequency and the potential for a second spectrum at higher frequencies. The authors conducted precise measurements of flexural normal-mode frequencies and amplitudes for various beam shapes, confirming that Timoshenko theory is valid below the critical frequency and that a second spectrum exists for free-free boundary conditions. The findings contribute to the ongoing debate regarding the pre

Author

uwu84565

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EN