SEDL / STP / STP787-EB / STP28489S

Nondestructive Evaluation of Fiber-Reinforced Composites with Acoustic Backscattering Measurements

Bar-Cohen, Y
NDE Principal Investigator, Systems Research Laboratories, Inc., Dayton, Ohio

Crane, RL
Materials Research Engineer, Air Force Wright Aeronautical Laboratories, Wright-Patterson Air Force Base, Ohio

Pages: 12    Published: Jan 1982

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Abstract

Experimental studies of acoustic backscattering in the Rayleigh region (0.1 ≤ ka ≤ 1.0) from fiber-reinforced composites were conducted. A significant increase in backscattering was observed for those orientations which place the axis of the fibers or other discontinuities at normal incidence to the acoustic beam. Fiber orientations and the distribution of cracks within specific plies were easily mapped by this technique.