CFRPの音速特性と新超音波探傷技術の研究

概要

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Ultrasonic wave propagation velocities in composite materials with laminated layer such as CFRP (Carbon Fiber Reinforced Plastic) are very difficult to be measured because of differences on the velocities between resin portion and fiber one. However, in ultrasonic testing, it is necessary to decide its velocities in all directions for detecting the location of defect. The experiment was carried out using two kinds of specimens, the dice (block) type and the plate type. Both specimens are manufactured from CFRP plate. In this paper, an approximate equation is proposed for propagation velocity in any direction of CFRP. Velocity in any direction can be calculated from both the velocities of 0 and 90 degree propagation angle which are able to be measured easily. The difference between calculated value and experimental one was within 10%. Furthermore, new inspection method is proposed. This method could detect exisistance of defects by audible sound converted from ultrasonic wave signals. Experimentally, the sound from defects were clearly distinguished from noise or others.
独立行政法人海上技術安全研究所の論文
1995-10-30