Anomalous ultrasonic dispersion in fluid-coupled, fibrous composite plates
1986; American Institute of Physics; Volume: 49; Issue: 9 Linguagem: Inglês
10.1063/1.97127
ISSN1520-8842
AutoresDale E. Chimenti, Adnan H. Nayfeh,
Tópico(s)Mechanical Behavior of Composites
ResumoThe ultrasonic dispersion characteristics of vertically polarized plate waves in fluid-coupled plates of unidirectional graphite-fiber reinforced epoxy have been found experimentally to display anomalous dispersion. This anomaly consists of a mixing of the two fundamental plate modes at phase velocities near the bulk composite transverse wavespeed. A calculation of ultrasonic reflection from a fluid-coupled composite plate accounts very well for the previously unreported experimental observations. It is demonstrated that the anomalous dispersion is a consequence of the presence of the fluid and is strongly enhanced by the highly anisotropic elastic nature of the composite. It is further shown that a much weaker manifestation of the effect also exists in fluid-coupled plates of elastically isotropic materials.
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