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Nonlinear analysis of soft auxetic core sandwich plates: layer-wise third-order model with core compressibility and shear deformation
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DOI：10.1016/j.compstruct.2026.120757.png)
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Abstract
En 中文
The nonlinear static analysis of soft auxetic core sandwich plates subjected to pressure and a localized point load is carried out using a layer-wise model. The sandwich plate consists of two identical stiff face sheets and a core placed in the middle. The layer-wise model introduces a second-order displacement field function for the face sheets, which well describes the transverse shear and neglects thickness deformation due to their high stiffness compared to the core. The thickness deformation and transverse shear deformation are modelled with a third-order displacement function within the soft core. 16 kinematic variables with 198 degrees of freedom are introduced to model the present layer-wise sandwich plate theory. The interfacial bond between core and face sheets is modelled by satisfying the continuity, and an independent kinematic parameter is used to describe the core’s thickness deformation. Polydimethylsiloxane (PDMS) is considered a suitable material for designing the auxetic core, and the response is compared with that of the polyvinyl butyral (PVB) material. The numerical results show that the auxetic cell structure may result in a lightweight compared to the PVB core sandwich plate, and core compressibility is moderate compared to that of the honeycomb core sandwich plate.
Keywords:
Sandwich plate
Soft core
Auxetic
Nonlinear analysis
Layer-wise theory
Thickness deformation
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7.1
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1.8W
Citations:
8.0W
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