Numerical Investigation of Vibration Characteristics and Damping Properties of CNT-Based Viscoelastic Spherical Shell Structure

Abstract

The carbon nanotubes (CNTs) have exceptional mechanical and thermal properties which make CNT-based nanocomposites ideal for the real-life applications in aerospace engineering, sports industries, underwater applications, etc. Experimental study is carried out for viscoelastic material characterization of CNT-reinforced nanocomposite with dynamic mechanical analyzer (DMA). Agglomeration and dispersion study is done with the help of scanning electron microscopy (SEM). Further Rayleigh damping model is incorporated for the spherical shell structure. Different volume fractions of CNTs are considered for such deep spherical shell structure. Frequency responses and time responses are obtained for such shell structures. Higher volume fraction of CNTs exhibits better mitigation of vibration in the shell structure. Improved damping properties are observed for such CNT-based viscoelastic shell structure.