Steel and Composite Structures
Volume 58, Number 5, 2026, pages 595-611
DOI: 10.12989/scs.2026.58.5.595
Nonlinear thermomechanical buckling analysis of porous GOri-reinforced auxetic sandwich cylindrical shells
Farzad Ebrahimi , Mohammadhossein Goudarzfallahi , Ali Alinia-ziazi
Abstract
This study investigates the nonlinear thermomechanical buckling and postbuckling behavior of porous sandwich cylindrical shells. The shells consist of a graphene-origami-reinforced auxetic metamaterial core and porous carbon nanotube (CNT)-reinforced face sheets, supported by a Winkler–Pasternak elastic foundation and subjected to external pressure in a thermal environment. To assess the influence of porosity, various porosity distribution models are examined across the shell thickness. Governing equations are formulated based on Reddy's third-order shear deformation theory (TSDT) and solved via the Galerkin method. Validation against established solutions in the literature demonstrates the high accuracy and reliability of the proposed model. A comprehensive parametric study is conducted to examine the effects of porosity characteristics, temperature variations, auxetic core, and Winkler Pasternak foundation properties on the buckling and postbuckling responses. The findings reveal that both porosity and temperature significantly influence the nonlinear buckling behavior, underscoring the necessity of accounting for these effects in designing advanced auxetic sandwich structures.
Key Words
carbon nanotube-reinforced composite; cylindrical shells; graphene-origami reinforced auxetic metamaterial; nonlinear thermomechanical buckling; porosity effects; temperature effects
Address
- Farzad Ebrahimi — Department of Mechanical Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran
- Mohammadhossein Goudarzfallahi — Department of Mechanical Engineering, SR.C., Islamic Azad University, Tehran, Iran
- Ali Alinia-ziazi — Department of Mechanical Engineering, SR.C., Islamic Azad University, Tehran, Iran
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