Dispersion and thermo-acoustoelastic effects of guided waves in the laminated cylindrical shells with SMA-reinforced core and nanocomposite surfaces.

In this paper, dispersion properties of guided waves in multilayer composite cylindrical shells are studied, which is composed of the inner and outer hybrid nanocomposite (MHC) layers and the middle composite core layer reinforced with shape memory alloy (SMA) fibers. According to the Hamiltonian principle and the thermoelastic theory, wave equations of the composite structure at different ambient temperatures are derived and discretized with spectral elements. By combing the thermal effects and the acoustoelastic effects, the modified semi-analytical finite element method is proposed here for the thermo-acoustoelastic effects of wave characteristics in laminated composite shells. The influence of important parameters on the dispersion characteristics of the structure is explored. The results show that the coupling of SMA fiber reinforced composite layer and MHC layers can significantly improve wave propagation characteristics of the composite cylindrical shells. The frequency of modal conversion increases with the increase of CNT volume fraction. Smaller radius-to-thickness ratios are favorable for internal wave propagation in the structure. This work is of great significance for the regulation of elastic wave propagation in multilayered cylindrical shell structures, and provides a valuable guide for the design and optimization of shell structures in engineering applications. [ABSTRACT FROM AUTHOR]