Abstract
Wideband acoustic spectroscopy with a laser ultrasound source for quantitative analysis of the effect of porosity on the attenuation coefficient of longitudinal acoustic waves in carbon fiber reinforced plastic (CFRP) composite materials was experimentally implemented. The samples under study had different bulk-porosity levels (up to 10%), which were determined using X-ray computer tomography. A resonance ultrasound attenuation peak associated with the one-dimensional periodicity of the layered composite structure was observed for all samples. The absolute value of the resonance-peak maximum and its width depend on the local concentration of microscopic isolated pores and extended delaminations in the sample structure. The obtained empirical relationships between these parameters of the frequency dependence of the ultrasound attenuation coefficient and the type of inhomogeneities and their volume concentration can be used for rapid evaluation of the structural quality of CFRP composites.
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Original Russian Text © A.A. Karabutov, N.B. Podymova, I.O. Belyaev, 2013, published in Akusticheskii Zhurnal, 2013, Vol. 59, No. 6, pp. 714–721.
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Karabutov, A.A., Podymova, N.B. & Belyaev, I.O. The influence of porosity on ultrasound attenuation in carbon fiber reinforced plastic composites using the laser-ultrasound spectroscopy. Acoust. Phys. 59, 667–673 (2013). https://doi.org/10.1134/S1063771013060080
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DOI: https://doi.org/10.1134/S1063771013060080