Dynamic analysis of functionally graded carbon nanotube–reinforced shell structures with piezoelectric layers under dynamic loads

Abstract

This research makes a first attempt to investigate the dynamic characteristics of functionally graded carbon nanotube–reinforced composite plates and shell structures with surface-bonded piezoelectric layers. A variational formulation is derived based on the linear double director shell theory to ensure realistic parabolic variation of transverse shear strain along the thickness direction. The assumed natural strains method is adopted to enhance the accuracy of the four-node piezoelectric shell element developed in this study. Numerical studies are conducted to validate the efficiency and numerical stability of the proposed model to predict the behavior of piezolaminated composite shell structures. Furthermore, dynamic responses are extended to functionally graded carbon nanotube–reinforced composite shells covered by two active layers. The host structure is reinforced by single-walled carbon nanotubes, which are assumed to be graded through the thickness direction with different types of distributions and embedded in a polymer matrix. The effect of the volume fractions, distribution type, and geometrical parameters of the carbon nanotubes is examined.

Mandibular bone remodeling around osseointegrated functionally graded biomaterial implant using three dimensional finite element model

“…In recent years, FG concept has become an issue of great interest and has prompted a significant amount of research activities worldwide in several areas and advanced sectors. [15][16][17][18][19][20] Furthermore, disparity of mechanical properties between engineered and inherent biomaterials represents a crucial concern facing dental implantation clinic, which makes osseointegration and bone remodeling critical. Additionally, the use of functionally graded biomaterials in implant prostheses have been proposed as a promising improvement to common implant materials due to their ability to simultaneously satisfy biocompatibility, strength, corrosion resistance.…”

“…Generally, properties of the FG material vary continuously throughout the long of the structure with different volumes fractions governed by several laws. In recent years, FG concept has become an issue of great interest and has prompted a significant amount of research activities worldwide in several areas and advanced sectors 15–20 . Furthermore, disparity of mechanical properties between engineered and inherent biomaterials represents a crucial concern facing dental implantation clinic, which makes osseointegration and bone remodeling critical.…”

Nonlinear oscillations of elliptical and sector prefabricated nanoplate-type structures made of functionally graded building material

“…Goulas et al [6] employed 3D printing process using fused filament fabrication technique to produce FG composites having variable relative permittivity to be applied in microwave devices. Mallek et al [7] employed the linear double director shell theory for dynamic analysis of FG composite shells with piezoelectric facesheet subjected to dynamic load. Li et al [8] fabricated FG ultra-high performance cementitious beam-type structures using slurry-infiltrated fibrous concrete together with ultra-high performance concrete.…”

Frequency manipulation of a light-activated shape-memory polymer-laminated cylindrical shell

“…Smart materials [1][2][3][4][5] are widely utilised in the fields of architecture, automobiles, aeronautics and astronautics, biomedical devices, active control [6][7][8] and intelligent sensors. Shape-memory material, a type of smart material that can be potentially used for active vibration control, is particularly suitable for functioning in sensors and actuators.…”