Vibration Analysis of Metal/Polymer/Metal Laminates - Approximate Versus Viscoelastic Methods

In this report, two finite element models are presented which predict the vibration characteristics of metal/polymer/metal laminates. The first model uses an approximate elastic solution, while the second model uses a viscoelastic solution. A finite element preprocessor was created to implement both models. With this preprocessor, four complex geometries and a simple plate are investigated. Predictions are made for natural frequencies, damping values, and frequency responses. In addition, the predictions for the plate and one of the geometries is compared to experimental results. It is shown that the two models predict natural frequencies well, but bound experimental damping values. The conservative estimate of damping is given by the viscoelastic model. It is further shown that if the geometry of the component resembles a beam, that both models agree. Based on these observations, recommendations are made to exclusively use the viscoelastic model in design analysis.