Abstract
Ultrasonic attenuation in carbon fiber reinforced epoxy composites (CFRP) was studied experimentally as well as theoretically. Attenuation coefficients of longitudinal and transverse waves were obtained by the spectral analysis of ultrasonic echoes obtained by aid of normal-incidence contact transducers. Measurements were carried out for epoxy resin and for unidirectional CFRP samples with different fiber volume fractions, as well as for CFRP laminates with different stacking sequences. For transverse waves, two polarization directions were examined which were parallel and perpendicular to the fiber direction in unidirectional composites. From these measurements, correlations between the fiber volume fraction, the wave mode (polarization direction) and the attenuation behavior were investigated. Furthermore, the attenuation behavior was discussed in the light of a theoretical model for ultrasonic attenuation in unidirectional CFRP.
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