Toward the measurement of angular dependence of in-plane ultrasonic properties of unidirectional carbon fiber-reinforced composites

Johnston, Patrick H.; Boghosian, Jeffrey S.; Hinders, Mark K.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1135
Academic Journal
Modern textile-based composite materials have complex fiber architectures, which present new challenges for ultrasonic characterization. As a step toward developing a measurement scheme for examining in detail the ultrasonic properties of textile composites, the present work addresses measurement of the angular dependence of the angular dependence of ultrasonic properties in unidirectional composite specimens. Cylindrical composite specimens of diameter 19 mm were fabricated, some with the fibers parallel to the cylinder axis and others with the fibers perpendicular to the cylinder axis. Additional specimens of varying diameters were made from acrylic. Small-diameter holes were drilled along the center axis of some specimens to serve as fiducial markers for the geometrical center of the cylinder. The measurement apparatus consisted of a ring of 100 matched transducers, spaced by 3.6°, facing the center of the ring. Each specimen was placed in turn at the center of the ring. Transmission measurements of attenuation and sound speed were performed by transmitting and receiving using pairs of transducers opposite each other on the ring. Backscattered waves were measured by transmitting and receiving with each transducer alone. The ultrasonic backscatter, attenuation and speed measured along a diameter of the cylinders were found to qualitatively and quantitatively match values measured in flat specimens. Angular “scattering” measurements were made by transmitting with one transducer and receiving with all 100 transducers. Substantial ultrasonic signals were generated in the “scattered” waves by phenomena related to the geometry of the cylindrical water/composite or water/acrylic interfaces, and at several angles these overlapped the desired scattered waves arising from the center of the cylinder. © 2000 American Institute of Physics.


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