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Nonlinear Guided Waves: Theoretical Considerations and Applications to Thermal Stress Measurement in Continuous Welded Rails

C. NUCERA, F. L. DI SCALEA

Abstract


The interest in nonlinear guided wave propagation has increased dramatically in the last few decades mainly because of the great potential in using nonlinear features of elastic waves in the nondestructive evaluation of structures. Generation of double harmonic and internal resonance phenomena in nonlinear isotropic waveguides have been analyzed in the past for simple geometries where an analytical solution for the waveguide modes is available. In this work the classical Semi-Analytical Finite Element formulation is extended to the nonlinear regime and is implemented into a commercial code. The usefulness of the approach is demonstrated through the study of the internal resonance conditions in a rail track.

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