A vibroacoustic study on damaged composite plates

Composite materials are widely used in aviation and maritime industries due to their high rigidity / weight ratios and other advantages. The mechanical and chemical properties of composite materials exposed to many environmental influences during their use are affected by this situation. For woven composite materials used in aviation, the most important concern is the effect of noise and temperature on the mechanical properties of these materials. The physical structure of the resin, which is the matrix phase in the composite materials, changes with the change of temperature. The rigidity of the resin changing physical form is decreasing and this can lead to dynamic instability in the structure of the composite material. In order to understand the effect of temperature on the composite plates, it is important to analyze the sound properties of the vibration structures together with the vibration analysis in the thermal environment in order to make a more accurate analysis. In this study, damage analysis will be experimentally determined by considering different types of composite plates (unidirectional fiber reinforced, woven). The importance of this work is to make a methodological evaluation for the further service usage with respect to vibroacoustic testing approach in the range of 20-50 °C.