Abstract
This paper reports on nonlinear wave propagation in quadratic nonlinear silicon rubber. A bifrequency harmonic tone burst is transmitted to the specimen, which leads to a distortion of the wave due to the nonlinear interaction of the fundamentals. Thus, higher order harmonic waves are generated. Each of the four second order harmonic waves at the difference frequency, the sum frequency and at twice the fundamental frequencies are analyzed and allow for an evaluation of the quadratic nonlinear elastic parameter, β. Emphasis is placed on the performance of the experimental set up. Piezocrystal transducer (PZT) and laser interferometer (LI) are tested and the advantages and disadvantages are pointed out. The laser detection in the near field of the transducer leads to variations in the result as well as the irreproducible couplant between PZT and specimen.
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