Vibration characteristics of sandwich microshells with porous functionally graded face sheets

International Journal of Engineering Science, Год журнала: 2023, Номер 189, С. 103884 - 103884

Опубликована: Май 6, 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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Nonlinear asymmetric thermomechanical buckling of shallow nanoscale arches having dissimilar end conditions embracing nonlocality and strain gradient size dependencies

Defence Technology, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

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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On nonlinear stability analysis of saturated embedded porous nanobeams

International Journal of Engineering Science, Год журнала: 2023, Номер 190, С. 103898 - 103898

Опубликована: Май 30, 2023

Язык: Английский

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Dynamic stability and frequency responses of the tilted curved nanopipes in a supersonic airflow via 2D hybrid nonlocal strain gradient theory

Engineering Structures, Год журнала: 2023, Номер 301, С. 117240 - 117240

Опубликована: Дек. 19, 2023

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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On wave propagation in nanobeams

International Journal of Engineering Science, Год журнала: 2024, Номер 196, С. 104014 - 104014

Опубликована: Янв. 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.

Язык: Английский

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Two-dimensional modeling of thermoelastic damping in small-sized circular plates with size-dependent behavior in both mechanical and thermal areas

Archives of Civil and Mechanical Engineering, Год журнала: 2025, Номер 25(2)

Опубликована: Янв. 29, 2025

Язык: Английский

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On three-dimensional dynamics of smart rotating micro-disks

International Journal of Engineering Science, Год журнала: 2025, Номер 211, С. 104236 - 104236

Опубликована: Март 7, 2025

Язык: Английский

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