Dynamics of graphene origami-enabled auxetic metamaterial beams via various shear deformation theories

International Journal of Engineering Science, Journal Year: 2024, Volume and Issue: 203, P. 104123 - 104123

Published: July 27, 2024

Although auxetic metamaterials exhibit unique and unusual mechanical properties, such as a negative Poisson's ratio, their mechanics remains poorly understood. In this study, we model graded beam fabricated from graphene origami-enabled investigate its dynamics the perspective of different shear deformation theories. The metamaterial is composed multiple layers metamaterials, where content origami varies through layered thickness; both property other properties are varied in manner, which effectively be approximated via micromechanical models. Euler-Bernoulli, third-order, higher-order deformable refined theories adopted to continuous system. Following this, governing motion equations derived using Hamiltonian principle then numerically solved weighted residual method. obtained results provide comprehensive understanding how distribution pattern, folding degree, utilisation influence dynamic behaviour beam.

Language: Английский

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Nonlinear combined resonance of axially moving conical shells under interaction between transverse and parametric modes

Communications in Nonlinear Science and Numerical Simulation, Journal Year: 2024, Volume and Issue: 131, P. 107849 - 107849

Published: Jan. 12, 2024

Language: Английский

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On a 3D material modelling of smart nanocomposite structures

International Journal of Engineering Science, Journal Year: 2023, Volume and Issue: 193, P. 103966 - 103966

Published: Oct. 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.

Language: Английский

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On mechanics of piezocomposite shell structures

International Journal of Engineering Science, Journal Year: 2024, Volume and Issue: 198, P. 104056 - 104056

Published: March 12, 2024

This study presents an original and novel investigation into the mechanics of piezo-flexo-magneto-elastic nanocomposite doubly-curved shells (PFMDCSs) ability to detect lower higher levels electro-magnetic fields. In this context, by utilizing first-order shear deformation shell model, stresses strains are acquired. By imposing Hamilton's principle von Kármán approach, governing equations have been obtained. The intelligent model consists size-dependent influences, viz., strain gradients. will take place via Mindlin's gradient elasticity theory subsequent re-establishing mathematical framework incorporating concept. results in a flexoelectric/flexomagnetic effect. converse effect magnetic field on basis close circuit has assumed. developed bending transferred algebraic ones substituting analytical technique based homogeneous immovable simple support for four edges. problem solved according Newton-Raphson iteration scheme, transverse deflections computed. For researching rightness precision models together with solution process, comparison is prepared finite element method (FEM) simplified shells, good correlation observed. At last, examining several factors problem, conditions under which effects can be noticeable dominant sought. could serve as benchmark reference piezoceramic-DCSs, presented original. most interesting outcome research that response structures entirely geometry-dependent.

Language: Английский

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On wave propagation in nanobeams

International Journal of Engineering Science, Journal Year: 2024, Volume and Issue: 196, P. 104014 - 104014

Published: Jan. 6, 2024

Wave propagation in Rayleigh nanobeams resting on nonlocal media is investigated this paper. Small-scale structure-foundation problems are formulated according to a novel consistent approach extending the special elastostatic analysis Barretta et al. (2022). Nonlocal effects of nanostructure modelled stress-driven integral law. External elasticity nano-foundation instead described by displacement-driven spatial convolution. The developed methodology leads well-posed continuum problems, thus circumventing issues and applicative difficulties Eringen–Wieghardt approach. interacting with nano-foundations then analysed dispersive features analytically detected exploiting strategy. Closed form expressions size-dependent dispersion relations established connection outcomes available literature contributed. A general provided address wave nanomechanical problems. Parametric studies finally accomplished discussed show length scale parameters characteristics small-scale systems current interest Nano-Engineering.

Language: Английский

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On three-dimensional dynamics of smart rotating micro-disks

International Journal of Engineering Science, Journal Year: 2025, Volume and Issue: 211, P. 104236 - 104236

Published: March 7, 2025

Language: Английский

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Study of nanotube waviness influence on the behaviors of spherical nanocomposites

International Journal of Engineering Science, Journal Year: 2024, Volume and Issue: 199, P. 104059 - 104059

Published: March 25, 2024

Language: Английский

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On nonlinear 3D electro-elastic numerical modeling of two-phase inhomogeneous FG piezocomposites reinforced with GNPs

International Journal of Engineering Science, Journal Year: 2024, Volume and Issue: 207, P. 104174 - 104174

Published: Nov. 27, 2024

Language: Английский

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On nonlinear buckling of microshells

International Journal of Engineering Science, Journal Year: 2024, Volume and Issue: 199, P. 104077 - 104077

Published: April 26, 2024

Language: Английский

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Elastic waves in graphene origami-enabled auxetic metamaterial thickness-deformable doubly-curved shells

International Journal of Engineering Science, Journal Year: 2025, Volume and Issue: 211, P. 104249 - 104249

Published: March 23, 2025

Language: Английский

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