In master's thesis work, a dedicated acquisition device is developed for capturing acoustic emission signals in polymer composite materials. Using this device, we determine the elastic modulus, anisotropy and dispersion curves of relatively thin composite plates with unknown mechanical properties. A method for determining dispersion curves using passive emission and narrow-band frequency filtering of the acoustic emission signal obtained through the Hsu-Nielsen test is also presented. The method is validated by comparing the results obtained via the active emission method and by observing the propagation of a Gaussian-modulated sinusoidal wave through the composite material.
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