Stress Distribution in Functionally Graded Nanocomposite Cylinders Reinforced by Wavy Carbon Nanotube

This work mainly reports effects of aspect ratio and waviness index of carbon nanotubes on the stress and displacement distributions of functionally graded nanocomposite cylinders reinforced by wavy single-walled carbon nanotubes based on mesh-free method. In this simulation, an axisymmetric model is used and three linear types of functionally graded distributions of wavy CNTs along the radial direction of cylinder are considered, and their results are compared with results of a uniform distribution. The material properties are estimated by a micro mechanical model. In the mesh-free analysis, moving least squares shape functions are used for approximation of displacement field in the weak form of motion equation and the transformation method was used for imposition of essential boundary conditions. Also, the effects of volume fraction and distribution pattern of wavy CNTs and cylinder thickness are investigated on the static responses of carbon nanotube reinforced composite cylinders subjected to internal or external pressure. It is observed that waviness has a significant effect on the effective reinforcement of the nanocomposites.