Proposal of evaluation method for fiber impregnation condition of discontinuous fiber CFRP based on the measurement of thermal diffusivity distribution in the thickness direction

Abstract

The discontinuous fiber CFRP formed by press forming has a problem in that there is an unimpregnated part where the resin is not sufficiently impregnated in the carbon fiber at the stage of the intermediate base material before forming, which causes voids in the product. It has become. In this study, we propose a new detection method based on the thermal diffusivity distribution in the thickness direction using line heating as a method for detecting the non-impregnated part at the stage of the intermediate substrate. In this paper, we report the validation of the thermal diffusivity measurement using standard samples, and the results of applying and comparing this method to impregnated and unimpregnated CFRP before molding.