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Dynamic mechanical characterization of viscoelastic materials using bending wave correlation vibrometry

Direct solid-borne sound measurements allow incorporation of phase in characterizing viscoelastic materials. In the absence of excessively large samples, reflections from specimen boundaries obscure this valuable data. Circularly crested bending waves generated in plates provide a means of preserving phase information while maintaining reasonable sample sizes. The coherence of signals measured equidistant from the source and the lack thereof concerning reflections, enables isolation of the direct sound. This talk presents developments in a laser Doppler vibrometer based dynamic mechanical characterization method aimed at broadband classification of viscoelastic materials. The applicability of this technique to in-situ applications is demonstrated. Material properties are shown to correspond with results from existing methods.Direct solid-borne sound measurements allow incorporation of phase in characterizing viscoelastic materials. In the absence of excessively large samples, reflections from specimen boundaries obscure this valuable data. Circularly crested bending waves generated in plates provide a means of preserving phase information while maintaining reasonable sample sizes. The coherence of signals measured equidistant from the source and the lack thereof concerning reflections, enables isolation of the direct sound. This talk presents developments in a laser Doppler vibrometer based dynamic mechanical characterization method aimed at broadband classification of viscoelastic materials. The applicability of this technique to in-situ applications is demonstrated. Material properties are shown to correspond with results from existing methods.