Self-heating of Polymeric Laminated Composite Plates Under the Resonant Vibrations: Theoretical and Experimental Study

The self-heating effect caused by the energy dissipation during vibration of viscoelastic materials is an important criterion in the evaluation of the structural degradation. In this study the theoretical model of the self-heating of the polymeric layered FRP plate subjected to the resonant vibration was proposed. The model is based on the complex parameters, which could be obtained in DMA tests. The theoretical model is validated in several experiments. The experiment contains two stages: first, the modal analysis was performed for the evaluation of natural frequencies of vibration and further the specimens were excited to harmonic vibration with their resonant frequencies in the constant strain rate mode. During the second stage the force response and evolution of the temperature distributions on the surface of the specimens were registered. Obtained results allow identifying the self-heating temperature evolution of the composite and determining the relation of the excitation frequency and self-heating temperature. Several phenomena observed during the experiments were interpreted following their physical nature. Investigated problem could be applied for predicting the structural life of such composites and in diagnostics and structural health monitoring of the parts and constructions made of polymeric composites. POLYM. COMPOS., 33:138-146, 2012. (C) 2011 Society of Plastics Engineers