Study and analysis of vibration and mechanical characteristics of PVC-carbon fiber-graphene nanocomposite pipes designed for oil and gas applications

This paper presents an innovative plastic injection molding technique for producing polyvinyl chloride/carbon fiber/graphene nanocomposite pipes. It includes calculating the natural frequencies and vibration properties of the composite pipe under various flow velocities of (Gas oil) fluid with a density of 0.822 g/cm³. The mechanical performance of the fabricated composite nano pipes is evaluated using three tests: axial tensile, axial compression stress, and ultimate strain. Young’s modulus varies, ranging between 40 GPa and 120 GPa depending on the composite metal’s percentage of polyvinyl chloride/ carbon fiber/ graphene. Mathematical results using MATLAB demonstrate that the reprocessed PVC/CF/Gr composites demonstrated superior mechanical performance relative to (FEM) predictions in the Ansys software workbench 21.0 package. Specifically, a 170% increase in Young’s modulus and a 140% increase in ultimate tensile strength were observed at 2 wt% graphene. Due to the bonding between the fibers and the polymer matrix, the highest difference in the fundamental natural frequency between the theoretical and numerical results was found to be 8.18%, at a speed of 2 m/s.