電着樹脂含浸法を用いて作製した炭素繊維複合材の振動特性

抄録

An autoclave molding with prepregs is the most general method of CFRP manufacturing. It is well known that this method is time and energy consuming and prevents the cost reduction of CFRPs. Therefore, aiming to improve CFRP productivity, some manufacturing methods without the autoclave have been proposed such as a vacuumed resin transfer molding（VaRTM）method. The authors have been also proposed a new CFRP manufacturing method that is an electro deposition resin molding（EDRM）method. The EDRM is an application of the electro deposition technology which has been used as a coating technology for automobiles, and it is suitable for mass productions. In our previous studies, static mechanical properties including stiffnesses and strength of CFRPs molded by the EDRM have been investigated, but their dynamic properties have not been done yet. Therefore, in this study, in order to evaluate the vibration characteristics of CFRPs produced by the EDRM, an experimental modal analysis and finite element analysis（FEA） were performed on CFRP specimens with straight and curved reinforcing fibers. The specimens were also manufactured by the VaRTM method and their vibration damping characteristics were compared. It was confirmed from numerical and experimental results that natural frequencies and eigenmode shapes agree well with high accuracy, and the FEA is useful for the specimen manufactured by the EDRM. It is also found that CFRPs produced by the EDRM has greater modal damping ratios than CFRPs by the VaRTM.