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    Multi-load effect on the deformation analysis of composite nano reinforced origami sandwich panel
    (Informa UK Limited, 2024-06-19)
    Cizhen Yu
    ;
    Peng Lin
    ;
    Zhixin Wu
    ;
    Mostafa Habibi
    ;
    Wei Zhang
    Graphene origami in a copper matrix is used as a composition of core in a sandwich panel between two piezoelectric/piezomagnetic layers. More accurate modeling of the composite sandwich structure is performed using a higher-order model including thickness stretching term. Principle of virtual work is used in order to derive governing equations in terms of resultant components of force and moment as well as electromagnetic loads. The resultant components are derived in higher-order framework with accounting electric and magnetic potentials using the effective material properties of graphene origami in Halpin-Tsai and rule of mixture framework. The deformation/strain/stress components are analytically obtained in terms of thermal, mechanical, electrical, and magnetic loads as well as folding degree and content of graphene origami. Verification is performed for justification of the numerical results. A foldability dependent parametric analysis is presented to show controllability of stress, strain and deformations along the thickness direction.
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    Electro-magneto-mechanical critical load analysis of piezoelectric/piezomagnetic sport force plates used for testing athlete performance
    (Informa UK Limited, 2024-10-16)
    Nannan Wang
    ;
    Tai Zhang
    ;
    Jin Yang
    ;
    Mostafa Habibi
    ;
    J. Feng
    Electro-magneto-thermo-mechanical critical loads of a sandwich microplate composed of a core integrated with piezoelectric/piezomagnetic face-sheets are analyzed in this paper based on higher order shear and normal deformation theory and modified couple stress theory. The constitutive relations are developed based on generalized Hooke’s law and electromagnetic relations. In order to measure athletic performance and his/her quantitatively or qualitatively grades, a force plate is used. The thickness stretching of the sport force plates is accounted based on a new function in displacement field. The electric and magnetic potentials are assumed as summation of a linear function including applied electric/magnetic potential and two functions for satisfying the zero condition at top and bottom of the sport force plates.