A review on the mechanics of graphene nanoplatelets reinforced structures

International Journal of Engineering Science, Год журнала: 2023, Номер 186, С. 103831 - 103831

Опубликована: Фев. 24, 2023

Язык: Английский

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Moving load excited dynamics of multi-layered imperfect microplates based on various micromechanical models

International Journal of Engineering Science, Год журнала: 2024, Номер 197, С. 104017 - 104017

Опубликована: Фев. 2, 2024

This paper presents an investigation into the importance of micromechanical models in analysis forced vibrations multi-layered microplates under a moving load. The microplate has core fabricated from functionally graded materials and face sheets consisting metal foam. problem is modelled via quasi-3D shear deformable method modified couple stress theory. study assumes that material follows power gradation pattern. Various models, i.e., Hashin-Shtrikman bounds, Voigt-Reuss-Hill, Voigt, Reuss, Tamura, are applied to estimate characteristics core. sheets, composed foams, possess closed- open-cell solid porosities. System's response time history type determined by numerically solving coupled motion equations obtained using force-moment balance method. A finite element conducted for simplified macroplate system, agreement between numerical results, proposed theoretical approach theory developed this paper, found be very good. results show influence mechanical properties layer, consequently impacting moving-load excited microsystem.

Язык: Английский

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Quasi-3D free and forced vibrations of poroelastic microplates in the framework of modified couple stress theory

Composite Structures, Год журнала: 2023, Номер 330, С. 117840 - 117840

Опубликована: Дек. 22, 2023

In this study, a comprehensive study on the vibration behaviour of functionally graded thick microplates with material imperfections is presented for free and forced vibrations within quasi-3D model modified couple stress (MCS) theory. Axial, transverse, rotation, stretching motions are considered modelling microplate in framework power-law scheme MCS theories. The deformation assumed to be infinitesimal modelled using linear strain–displacement relationships. Using virtual work method, governing motion equations derived. For fourfold coupled (axial-transverse-rotation-stretching) characteristics, partial differential components discretised via trigonometric expressions corresponding natural frequencies time histories (time-dependent deflections) determined numerically. methodology initially validated through comparative analysis between macrolevel simplified structure those obtained finite element software. Additionally, simulation compared, validation purposes, other versions from literature. Once model's validity confirmed, an investigation into conducted new model. results demonstrate considerable effect thickness imperfection characteristics poroelastic microplates.

Язык: Английский

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Bending analysis of functionally graded nanobeams based on stress-driven nonlocal model incorporating surface energy effects

International Journal of Engineering Science, Год журнала: 2023, Номер 189, С. 103887 - 103887

Опубликована: Май 11, 2023

The bending response of Bernoulli-Euler nanobeams made a functionally graded (FG) material with different cross-sectional shapes is investigated in this manuscript by stress-driven model incorporating surface energy effects. In particular, the FG nanobeam composed bulk volume and layer regarded as membrane zero thickness perfectly adhered to continuum. mixture metal ceramic, whose distributions spatially vary from bottom top nanobeams. nonlocal governing equations elastostatic problem are derived using virtual work principle. main results parametric investigation also presented discussed varying parameter, gradient index boundary conditions at ends They show how proposed able study behavior inflected including

Язык: Английский

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Vibrations of porous functionally graded CNT reinforced viscoelastic beams connected via a viscoelastic layer

International Journal of Engineering Science, Год журнала: 2023, Номер 191, С. 103917 - 103917

Опубликована: Июнь 19, 2023

Язык: Английский

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Analyzing of continuous and discontinuous contact problems of a functionally graded layer: theory of elasticity and finite element method

Mechanics Based Design of Structures and Machines, Год журнала: 2023, Номер 52(8), С. 5720 - 5738

Опубликована: Окт. 9, 2023

AbstractContact mechanics analysis is crucial because such problems often arise in engineering practice. When examining contact mechanics, the material property of contacting components a crucially significant aspect. It more complex to solve systems that are composed materials do not have homogenous structure compared homogeneous qualities throughout. While many studies on with exist, those involving non-homogeneous scarce literature. As technology improves fast, there will be greater need problems. In this respect, analytical and finite element method (FEM) solutions continuous discontinuous functionally graded (FG) layer carried out article. The FG problem rests rigid foundation pressed punch. From solutions, length, stress, initial separation distance, beginning ending points were determined, results compared. has been concluded FEM findings consistent satisfactory degree. This study analyzes using different approaches accounts for influence body force geometry yet reported.Keywords: Contact mechanicsfinite methodtheory elasticityfunctionally Disclosure statementThe authors declare no conflicts interest.Additional informationFundingNone.

Язык: Английский

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On a 3D material modelling of smart nanocomposite structures

International Journal of Engineering Science, Год журнала: 2023, Номер 193, С. 103966 - 103966

Опубликована: Окт. 13, 2023

Smart composites (SCs) are utilized in electro-mechanical systems such as actuators and energy harvesters. Typically, thin-walled components beams, plates, shells employed structural elements to achieve the mechanical behavior desired these composites. SCs exhibit various advanced properties, ranging from lower order phenomena like piezoelectricity piezomagneticity, higher effects including flexoelectricity flexomagneticity. The recently discovered flexomagneticity smart has been investigated under limited conditions. A review of existing literature indicates a lack evaluation three-dimensional (3D) elasticity analysis when flexomagnetic effect (FM) exists. To address this issue, governing equations will incorporate term ∂/∂z, where z represents thickness coordinate. variational technique guide us further developing equations. By using hypotheses theories 3D beam model, von Kármán's strain nonlinearity, Hamilton's principle, well-established direct converse FM models, we derive constitutive for thick composite beam. Conducting implies that gradient tensors must be expressed forms. inclusion ∂/∂z necessitates construction different model. It should noted current commercial finite element codes not equipped accurately adequately handle micro- nano-sized solids, thus making it impractical model structure programs. Therefore, transform derived characteristic linear bending into semi-analytical Polynomial domain obtain numerical results. This study demonstrates importance conducting analyses explore coupling multiple physical structures.

Язык: Английский

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Highly nonlinear hyperelastic shells: Statics and dynamics

International Journal of Engineering Science, Год журнала: 2022, Номер 183, С. 103794 - 103794

Опубликована: Дек. 2, 2022

Язык: Английский

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Size-dependent nonlinear thermomechanical in-plane stability of shallow arches at micro/nano-scale including nonlocal and couple stress tensors

Mechanics Based Design of Structures and Machines, Год журнала: 2023, Номер 52(6), С. 3229 - 3251

Опубликована: Апрель 12, 2023

In the present exploration, unconventional tensors of nonlocal stress and couple are incorporated simultaneously in in-plane nonlinear stability analysis functionally graded (FG) multilayer shallow micro/nano-arches under thermomechanical loading conditions. For this purpose, (NCS) mechanics continuum is implemented into third-order shear flexible arch theory incorporating von Karman kinematical nonlinearity. The nanocomposite material FG reinforced with graphene nanofillers accordance different patterns lamination. generalized differential quadrature numerical strategy conjunction pseudo arc-length continuation procedure employed to deduce roles NCS-based paths loaded micro/nano-arches. It found that for all lamination, contributions associated nonlocality small scale effects on value upper limit as well first bifurcation compressive loads less than those lower second ones. Also, it demonstrated by combining a temperature rise applied lateral load, load increases, while one decreases. Furthermore, seen applying rise, an initial deflection induced micro/nano-arch before load.

Язык: Английский

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Wave propagation in a porous functionally graded curved viscoelastic nano-size beam

Waves in Random and Complex Media, Год журнала: 2023, Номер unknown, С. 1 - 22

Опубликована: Янв. 9, 2023

In this paper, wave propagation analysis of a viscoelastic system curved nanobeams made porous functionally graded materials (P-FGM) is studied, for the first time. The displacement fields nanobeam are obtained via higher-order shear deformation beam theory which contains curvilinear axial, rotation, transverse, and thickness stretching effects, while size effects considered using nonlocal strain gradient theory. effective material properties P-FGMs expressed by modified model power-law variation connected with cosine functions to estimate effect porosity Kelvin–Voigt estimating behavior on mechanics nanostructures. Hamilton's principle applied find governing equations motion nanobeam. state space method set mathematical series developed response. Influence value types distributions, viscosity coefficient, index, geometry, opening angle (related curvature radius) phase velocity investigated.

Язык: Английский

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