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Well-posedness of two-phase local/nonlocal integral polar models for consistent axisymmetric bending of circular microplates

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Abstract

Previous studies have shown that Eringen’s differential nonlocal model would lead to the ill-posed mathematical formulation for axisymmetric bending of circular microplates. Based on the nonlocal integral models along the radial and circumferential directions, we propose nonlocal integral polar models in this work. The proposed strain-and stress-driven two-phase nonlocal integral polar models are applied to model the axisymmetric bending of circular microplates. The governing differential equations and boundary conditions (BCs) as well as constitutive constraints are deduced. It is found that the purely strain-driven nonlocal integral polar model turns to a traditional nonlocal differential polar model if the constitutive constraints are neglected. Meanwhile, the purely strain- and stress-driven nonlocal integral polar models are ill-posed, because the total number of the differential orders of the governing equations is less than that of the BCs plus constitutive constraints. Several nominal variables are introduced to simplify the mathematical expression, and the general differential quadrature method (GDQM) is applied to obtain the numerical solutions. The results from the current models (CMs) are compared with the data in the literature. It is clearly established that the consistent softening and toughening effects can be obtained for the strain- and stress-driven local/nonlocal integral polar models, respectively. The proposed two-phase local/nonlocal integral polar models (TPNIPMs) may provide an efficient method to design and optimize the plate-like structures for microelectro-mechanical systems.

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Funding

Project supported by the National Natural Science Foundation of China (No. 12172169) and the Research Fund of State Key Laboratory of Mechanics and the Priority Academic Program Development of Jiangsu Higher Education Institutions of China

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  1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Hai Qing

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  1. Hai Qing
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Correspondence to Hai Qing.

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Qing, H. Well-posedness of two-phase local/nonlocal integral polar models for consistent axisymmetric bending of circular microplates. Appl. Math. Mech.-Engl. Ed. 43, 637–652 (2022). https://doi.org/10.1007/s10483-022-2843-9

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  • DOI: https://doi.org/10.1007/s10483-022-2843-9

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