The purpose of this work is to show an influence of interlayer separations on dynamic behaviour of simple laminated elements of smart structures. A general bending - extensional model of the response of a simple laminated structure to excitation by a non-symmetric actuator made using piezoelectric elements is presented. Edge delamination is modelled by changing the effective length of debonded actuator. The analysis shows that the edge delamination has a harmful effect on the performance ofpiezoactuators. but the significant decrease of natural frequencies with an increase of delamination length is not observed. The dynamics and stability of rotating hybrid shafts with delamination is also presented. The composite thin-walled rotating shaft, treated as a symmetrically laminated shell, contains both the conventional (e.g. graphite or glass) angle-ply layers and the activated shape memory alloy fibres parallel to the shaft axis. The results indicate that the delamination moderately decreases the critical angular velocity.
PL
W artykule przedstawiono wpływ oddzielania się warstw struktury kompozytowej. Uwzględniono działanie piezoelektryczne układu myślącego. Wykonano też analizę stateczności wirującego wału wykonanego z kompozytu. Stwierdzono, że delaminacja zmniejsza krytyczną prędkość kątową.
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Mathematical modeling of axisymmetric waves in a piezoelectric fiber of circular cross section coated with thin film is studied using three-dimensional theory of piezoelectricity. Potential functions are introduced to uncouple the equations of motion, electric conduction equations. The surface area of the fiber is coated by a perfectly conducting gold material. The frequency equations are obtained for longitudinal and flexural modes of vibration and are studied numerically for PZT-4 ceramic fiber. The computed nondimensional frequencies and attenuation for fiber with and without coating are presented in the form of dispersion curves.
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