Identification of the dynamic characteristics ofan epoxy-glass composite plate

In addition to the advantages of high stiffness and light weight structures, the fiber reinforced composites exhibit the prominent vibration damping. In general, the mechanical characteristics of composite materials depend on various parameters such as materialscombination, lay-up configuration and techniques of production. Hence, usually there is no standard datasheet for these characteristics. In this paper, the inverse eigenvalue sensitivityidentification method is employed to identify the viscoelastic and damping properties of an epoxyglass composite plate. Experimental modal parameters are extracted from measured frequencyresponse function (FRF) data and compared to their analytical counterparts. The finite element mesh is constituted by shell elements lying on the median surface of the layered plate. In order tomodel the damping between the fibers and resin as well as the inter-laminar damping, a viscous proportional damping matrix is considered.

Keywords:

inverse eigen sensitivity (IES) identification method , Frequency response function (FRF) , Epoxy-glasscomposite plate , proportional damping