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3 April 2012 Finite element simulation of guided waves generated by laser pulses
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Thermoelastic guided waves, induced by a laser pulse on a material surface, demonstrate advantages for nondestructive evaluation of structures due to the non-contact feature and effectiveness to generate broadband signals. Both symmetric and asymmetric Lamb waves can be generated by the local thermal expansion from the laser energy absorption. We consider the thermomechanical equation and solve the problems using the finite element method. The capability of the finite element method for the modeling of guided wave propagation induced by laser pulses is demonstrated, and the computational efficiency is improved significantly by partitioning the plate into thermomechanical and mechanical subregions. Numerical results are compared with experimental observations of Lamb waves generated by unfocused and line-focused laser sources. Using the wavelet transform, the group velocity of A0 mode is obtained from the detected signal and compared to the solution of Rayleigh-Lamb equations. Lamb waves in a plate with defects of different lengths are examined.
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Wenyang Liu and Jung-Wuk Hong "Finite element simulation of guided waves generated by laser pulses", Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 83450C (3 April 2012);

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