Abstract
Time-reversal acoustics (TRA) can provide focusing of broadband frequency pulses in complex structures where different types of elastic waves can propagate. In this work, TRA focusing efficacy in the presence of mechanical damage in a material to test the integrity of various composites has been explored. The experiments were conducted on the following materials: (1) Static and cyclic loaded composite samples made of Grade 11 Garolite. (2) A Garolite plate with local damages created by an air gun bullet. (3) Epoxy/carbon fiber composites with mechanical damage. Experiment results demonstrated that a TRA focused signal passing through a damaged area has a greater level of distortion. This effect is manifested in the shape of a waveform of the TRA focused signal. In the presence of the defect, the density of the acoustic energy in the TRA focused waveform redistributes, decreasing in the center and increasing at the sides. The distortion of the TRA focused signal was significant for the composite samples affected by cyclic loading even when there were no visible defects. [Work supported by NASA.]
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