Finite amplitude flexural vibrations at ultrasonic frequencies in metallic bars

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Abstract
9 páginas, 15 figurasThis paper deals with a theoretical and experimental study about the nonlinear behavior of metals\ud subjected to intense ultrasonic, flexural vi brations. In the theoretical analysis a one-dimensional,\ud second-order wave equation is established and solved by means of the successive approximation\ud method. The solution for standing, flexural waves is obtained by applying the superposition\ud principle. Spatial distributions of force, momentum, and particle velocity are derived as well as the\ud waveforms. The experimental study is carried out with resonant, prismatic bars driven at their\ud central sections at frequencies in the range of 20-30 kHz. The samples are driven by means of a\ud piezoelectric transducer. The vibration amplitudes and waveforms are monitored by using a laser\ud vibrometer. Good agreement is found comparing the experimental and theoretical results.This research was supported by the Plan Nacional de\ud Tecnologías Avanzadas de la Producción (research project\ud TAP 93-230). The authors thank Dr. F. Montoya-Vitini and\ud Mr. P.T . Sánz-Sánchez for the designm and construction of the\ud electronic excitation system and Dr. T. Hoffmann for revision.Peer reviewe

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