A PARAMETRIC STUDY OF MATERIAL DAMPING IN FIBER-REINFORCED PLASTICS

In this paper, the important parameters causing energy dissipation in unidirectional glass fibre-reinforced epoxy laminae are investigated. Three parameters are considered: matrix and fibre damping and the effe ct of the interface. An energy balance approach is used to find closed -form relationships between material properties and design parameters. This approach shows that the fibre or matrix contribution to damping lies in the partition of elastic strain energy, which is highly depend ent on the elastic properties of the fibres and matrix. A three-phase model is developed which clearly shows that a poor quality interface, with low elastic stiffnesses, has a significant effect on the energy d amping capacity of the unidirectional laminate. However, in the case o f a normal quality interface, more sensitive and accurate damping meas urement methods are needed to identify the contribution of interface d amping to the global laminate damping behaviour.