Damping Model of Fiber Reinforced Composites and Factors Affecting Damping and Dynamic Response

A damping model of fiber reinforced composites was established in this study. Meanwhile, the accuracy of the damping model was verified through experiments. Subsequently, the factors affecting the damping ratio and dynamic response under sinusoidal excitation force of fiber reinforced composites were explored and the measures improving the damping ratio were proposed. The damping model of the fiber reinforced composite was applied to its dynamic equation, and then the dynamic response curves were calculated by the direct time integration method, and the calculated dynamic response curves were compared with the experimental dynamic response curves. The two groups of curves almost coincided, verifying the excellent accuracy of the damping model. Additionally, this study discussed the effects of the fiber volume fraction, the thickness of each layer, the number of layers, the orientation of laying-up, and the sequence of layers on the damping ratio and dynamic response of composite material laminates. The damping model proposed in this paper was suitable for calculating the response curves of composite laminates under sinusoidal concentrated loads. The damping model can be used to calculate the response of the laminate in the elastic range. The accuracy of the model was verified through experiments in the frequency range of 10–200 Hz. The method of calculating the dynamic response of fiber reinforced composites proposed in this study can be easily inserted into the finite element analysis software and directly applied to engineering practice.