Vibration characteristics of carbon fiber reinforced composites fabricated by electrodeposition molding method

抄録

The present paper investigates the vibration characteristics of CFRPs including the anisotropic damping properties. Carbon fiber (CF) preforms are prepared by a tailored fiber placement (TFP) machine, and the electrodeposition resin molding (ERM) method is used to impregnate the resin into CF preforms. CFRP plates are fabricated by two different methods which are the ERM and vacuumed assisted resin transfer molding (VaRTM), and experimental modal analysis is conducted to compare the vibration characteristics of those plates. The experimental results show plates fabricated by the ERM exhibit higher damping properties than those by VaRTM. Then, anisotropic damping properties of the present CFRP plates composed of plain weave layers and TFP layers are identified using the finite element analysis (FEA) with the experimental results. In this analysis, the damping properties are modeled by specific damping capacity (SDC) that is defined as the ratio of the dissipated energy and the maximum strain energy in one cycle of loading. Those parameters are determined by minimizing the difference between modal SDCs calculated by the FEA and measured by the experiment. To solve the minimization problem, particle swarm optimization (PSO) is used. Obtained damping parameters enable us to design damping properties more flexibly for CFRPs with arbitrarily shaped fibers.