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http://dx.doi.org/10.12989/anr.2020.9.1.033

On post-buckling characteristics of functionally graded smart magneto-electro-elastic nanoscale shells  

Asrari, Reza (Faculty of Industrial and Mechanical Engineering, Qazvin Branch, Islamic Azad University)
Ebrahimi, Farzad (Department of Mechanical Engineering, Faculty of Engineering, Imam Khomeini International University)
Kheirikhah, Mohammad Mahdi (Faculty of Industrial and Mechanical Engineering, Qazvin Branch, Islamic Azad University)
Publication Information
Advances in nano research / v.9, no.1, 2020 , pp. 33-45 More about this Journal
Abstract
Geometrically nonlinear buckling of functionally graded magneto-electro-elastic (FG-MEE) nanoshells with the use of classical shell theory and nonlocal strain gradient theory (NSGT) has been analyzed in present research. Mathematical formulation based on NSGT gives two scale coefficients for simultaneous description of structural stiffness reduction and increment. Functional gradation of material properties is described based on power-law formulation. The nanoshell is under a multi-physical field related to applied voltage, magnetic potential, and mechanical load. Exerting a strong electric voltage, magnetic potential or mechanical load may lead to buckling of nanoshell. Taking into account geometric nonlinearity effects after buckling, the behavior of nanoshell in post-buckling regime can be analyzed. Nonlinear governing equations are reduced to ordinary equations utilizing Galerkin's approach and post-buckling curves are obtained based on an analytical procedure. It will be shown that post-buckling curves are dependent on nonlocal/strain gradient parameters, electric voltage magnitude and sign, magnetic potential magnitude and sign and material gradation exponent.
Keywords
post-buckling; classical shell theory; functionally graded material; magneto-electro-elastic material; nonlocal strain gradient theory;
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