PARAMETER IDENTIFICATION OF FIBER-REINFORCED COMPOSITE MATERIAL BASED ON THE NON-CONTACT VIBRATION EXCITATION-MEASURING INTEGRATED TECHNOLOGY

A parameter identification method of fiber-reinforced composite material was proposed based on the non-contact vibration excitation-measuring integrated technology. The advantages of planar acoustic wave excitation and high-precision laser vibration measurement were comprehensively utilized. Firstly, by taking a composite thin plate of this kind as an example, a theoretical model under planar acoustic wave excitation was established. A theoretical solution to the time-domain vibration response was also obtained through the formula derivation, which was combined with the classical laminate theory, complex modulus method, strain energy method, etc. Subsequently, based on theoretical and measured data, the material parameters of CF140 carbon fiber/epoxy resin were successfully identified by the particle swarm iterative-solving method. By comparing with the material parameters provided by the manufacturer, it was found that this method not only had a high identification accuracy when acquiring the elastic moduli and Poisson's ratios, but also could identify the loss factors in the longitudinal, transverse and shear directions of fiber-reinforced composite material.