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Along with the amplitude and dispersion directivity, conditioned by the material
anisotropy, source-induced elastic guided waves in layered fiber-reinforced polymer composite
structures exhibit non-neglectable attenuation due to the polymer matrix viscosity. The latter
should be adequately accounted for in ultrasonic nondestructive testing and structural health
monitoring systems for their reliable operation. In the current paper, the influence of attenuation
on guided wave propagation in anisotropic laminates is investigated experimentally and
numerically. In the computational model, viscosity driven wave amplitude decay is addressed
through the complex stiffness matrix, and semi-analytical integral approach is employed for
parametric analysis. Experimental measurements are performed for piezoelectrically excited
guided waves with scanning laser Doppler vibrometry technique.
Keywords: elastic guided waves; laminate composites; attenuation; linear viscoelasticity. |
full paper (pdf, 1776 Kb)