Ultrasonic Resin Impregnation Monitoring in Hand Layup and RTM Molding and Mechanical Property Evaluation

Abstract

In this study, the monitoring method using ultrasonic waves, which has been developed in our laboratory for RTM molding, were applied to hand layup molding, and the effect of the FRP molding method on the mechanical properties of the molded products was evaluated. From the results of resin impregnation monitoring, it is confirmed that the reflected waves from the upper and lower interface of FRP layer could be detected not only in RTM molding but also in hand layup molding, indicating that ultrasonic resin impregnation monitoring is effective in hand layup molding as well. In addition, tensile tests of the molded plates with different molding methods showed that FRP molded by RTM method has lower mechanical properties than hand layup products.