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<p>In this survey, the torsional and axial buckling analysis of polymer matrix hybrid functionally graded multilayered graphene platelets (GPLs) and carbon nanotubes (CNTs) reinforced composite (FG-GPL/CNT RC) cylindrical shell resting on Winkler elastic foundation is studied for the first time. In order to determine the effective elastic characteristics and mechanical properties of each GPL/CNT RC layer of the composite structure, the extended model of Halpin–Tsai micromechanics and rule of mixtures is applied. A numerical method based on the linear theory of 3D elasticity, incorporating Green’s strain geometric nonlinearity and the virtual work principle, is utilized. Using the finite element procedure and geometric stiffness concept, the desired eigenvalue buckling loads are obtained. The accuracy of the solution procedure is also scrutinized by comparing the buckling loads with those presented in the previously published papers. The numerical results through a detailed parametric investigation, comprehensively present the effects of various parameters on the buckling load of hybrid FG-GPL/CNT RC cylindrical shell in several tabular, graphical, and diagrammatical data. The impact of all possible factors, such as torsional and axial load conditions, the weight fraction and distribution pattern of reinforcing constituents, the number of multilayers, the volume fraction index for nonlinear gradient patterns, the shell’s thickness and length ratios, the Winkler elastic foundation, and boundary conditions, is examined. Parametric analyses show that the FG-X pattern achieves the highest torsional buckling capacity, from 1.20 up to 1.57 times greater than UD, FG-V, and FG-O patterns. GPLs outperform CNTs, with buckling loads 54.3% higher at 0.5 wt% and over 64% at 1.0 wt%.</p>

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Torsional and Axial Buckling Analysis of Functionally Graded Multilayered Hybrid Nanocomposite Cylindrical Shell Reinforced with GPLs and CNTs Surrounded by Elastic Medium

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Mohammad Javad Bayat,
  • Amin Kalhori,
  • Kamran Asemi

摘要

In this survey, the torsional and axial buckling analysis of polymer matrix hybrid functionally graded multilayered graphene platelets (GPLs) and carbon nanotubes (CNTs) reinforced composite (FG-GPL/CNT RC) cylindrical shell resting on Winkler elastic foundation is studied for the first time. In order to determine the effective elastic characteristics and mechanical properties of each GPL/CNT RC layer of the composite structure, the extended model of Halpin–Tsai micromechanics and rule of mixtures is applied. A numerical method based on the linear theory of 3D elasticity, incorporating Green’s strain geometric nonlinearity and the virtual work principle, is utilized. Using the finite element procedure and geometric stiffness concept, the desired eigenvalue buckling loads are obtained. The accuracy of the solution procedure is also scrutinized by comparing the buckling loads with those presented in the previously published papers. The numerical results through a detailed parametric investigation, comprehensively present the effects of various parameters on the buckling load of hybrid FG-GPL/CNT RC cylindrical shell in several tabular, graphical, and diagrammatical data. The impact of all possible factors, such as torsional and axial load conditions, the weight fraction and distribution pattern of reinforcing constituents, the number of multilayers, the volume fraction index for nonlinear gradient patterns, the shell’s thickness and length ratios, the Winkler elastic foundation, and boundary conditions, is examined. Parametric analyses show that the FG-X pattern achieves the highest torsional buckling capacity, from 1.20 up to 1.57 times greater than UD, FG-V, and FG-O patterns. GPLs outperform CNTs, with buckling loads 54.3% higher at 0.5 wt% and over 64% at 1.0 wt%.