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<p>In this study, the free-vibration behavior of hybrid sandwich cylindrical panels and plates is investigated, comprising carbon–epoxy face sheets reinforced with shape memory alloy (SMA) wires and a polyurethane (PU) foam core enriched with alumina nanoparticles. This work introduces a novel hybrid sandwich structure that integrates shape memory alloys and nanocomposites and examines its behavior through nonlinear free-vibration analysis. The sandwich panel displacement field was according to Third-order Shear Deformation Theory (TSDT). The Hamilton's principle was used for deriving the governing equations. The one-dimensional Brinson model was employed to model SMA behavior. The solution was performed using a consistent TSDT non-linear Finite Element Method (FEM). The influences of boundary conditions, SMA and nanoparticle contents, pre-strain, stacking sequence, temperature, amplitude to thickness ratio <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\((w_{\max } /h)\)</EquationSource> </InlineEquation> and geometric parameters on the natural frequencies of the cylindrical panels and plates were evaluated. The results showed that as the pre-strain increases, the recovery stress intensifies, counteracting thermal stresses and delaying structural instability, ultimately causing the natural frequency to approach zero at higher temperatures.</p>

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Effect of shape memory alloy and alumina nanoparticles on nonlinear free vibration of hybrid sandwich panels

  • 期刊论文

  • 发表日期：

    2026年7月2日

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  • Arman Soltani,
  • Abdolhossein Fereidoon,
  • Mohammad Mahdi Khatibi,
  • Alireza Albooyeh

摘要

In this study, the free-vibration behavior of hybrid sandwich cylindrical panels and plates is investigated, comprising carbon–epoxy face sheets reinforced with shape memory alloy (SMA) wires and a polyurethane (PU) foam core enriched with alumina nanoparticles. This work introduces a novel hybrid sandwich structure that integrates shape memory alloys and nanocomposites and examines its behavior through nonlinear free-vibration analysis. The sandwich panel displacement field was according to Third-order Shear Deformation Theory (TSDT). The Hamilton's principle was used for deriving the governing equations. The one-dimensional Brinson model was employed to model SMA behavior. The solution was performed using a consistent TSDT non-linear Finite Element Method (FEM). The influences of boundary conditions, SMA and nanoparticle contents, pre-strain, stacking sequence, temperature, amplitude to thickness ratio \((w_{\max } /h)\) and geometric parameters on the natural frequencies of the cylindrical panels and plates were evaluated. The results showed that as the pre-strain increases, the recovery stress intensifies, counteracting thermal stresses and delaying structural instability, ultimately causing the natural frequency to approach zero at higher temperatures.