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Smart Structures and Systems Volume 23, Number 3, March 2019 , pages 215-225 DOI: https://doi.org/10.12989/sss.2019.23.3.215 |
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Nonlocal strain gradient model for thermal stability of FG nanoplates integrated with piezoelectric layers |
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Behrouz Karami and Davood Shahsavari
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| Abstract | ||
| In the present paper, the nonlocal strain gradient refined model is used to study the thermal stability of sandwich nanoplates integrated with piezoelectric layers for the first time. The influence of Kerr elastic foundation is also studied. The present model incorporates two small-scale coefficients to examine the size-dependent thermal stability response. Elastic properties of nanoplate made of functionally graded materials (FGMs) are supposed to vary through the thickness direction and are estimated employing a modified power-law rule in which the porosity with even type of distribution is approximated. The governing differential equations of embedded sandwich piezoelectric porous nanoplates under hygrothermal loading are derived through Hamilton\'s principle where the Galerkin method is applied to solve the stability problem of the nanoplates with simply-supported edges. It is indicated that the thermal stability characteristics of the porous nanoplates are obviously influenced by the porosity volume fraction and material variation, nonlocal parameter, strain gradient parameter, geometry of the nanoplate, external voltage, temperature and humidity variations, and elastic foundation parameters. | ||
| Key Words | ||
| porous materials; thermal stability; refined plate theory; nonlocal strain gradient theory; hygrothermal environment; elastic substrate | ||
| Address | ||
| Behrouz Karami and Davood Shahsavari: Department of Mechanical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran | ||