Abstract
Detecting plastic deformation area at crack tips of FRM is very important for understanding the mechanism of reinforcing matrix by fibers. Few method, however, are proposed to detect the plastic deformation inside the FRM. Recently, a scanning acoustic microscope has developed and this gives us chance to detect the plastic deformation area. In this study, several acoustic methods including a scanning acoustic microscope were examined to detect the image of it. As results, acoustic velocity change as a function of plastic strain of aluminum alloy was obtained and the change was discussed with a dislocation vibration model. The images with 50 MHz acoustic lens and 200 MHz acoustic lens were obtained and investigated in detail.
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