Acta Mechanica最新文献_第7页

Vortex rings at low Reynolds numbers in confined domains 受限域中低雷诺数涡旋环

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-08 DOI: 10.1007/s00707-026-04717-2

Diego Silva-Soto, Martín Salinas-Vázquez, Carlos Palacios-Morales, Rafael Chávez-Martínez, William Vicente

{"title":"Vortex rings at low Reynolds numbers in confined domains","authors":"Diego Silva-Soto, Martín Salinas-Vázquez, Carlos Palacios-Morales, Rafael Chávez-Martínez, William Vicente","doi":"10.1007/s00707-026-04717-2","DOIUrl":"10.1007/s00707-026-04717-2","url":null,"abstract":"<div><p>This study presents a numerical investigation of vortex rings generated at low Reynolds numbers within radially confined domains. The motivation stems from the lack of previous studies addressing these combined conditions, which are relevant to wall-bounded microjet flows. We solve the governing equations using the entropy-damped artificial-compressibility (EDAC) formulation with compact finite-difference schemes (CS-FD) and a third-order total variation diminishing Runge–Kutta (TVD-RK3) method; moreover, an immersed-boundary method (IBM) resolves curvilinear walls on a Cartesian grid. Validation against high-Reynolds-number confined and low-Reynolds-number unconfined experiments, and against direct numerical simulations, confirms the solver’s accuracy. We examine vortex rings with <span>(L/D_0=4.0)</span> over <span>(150le Rele 1000)</span> and confinement ratios <span>(D_C/D_0=1.75,,2.0,,2.5)</span>, plus an unconfined reference. In all cases, two dissipation zones appear: one within the ring and another near the wall. The dominant site shifts with <i>Re</i>: for <span>(Rele 250)</span> dissipation concentrates in the ring, whereas for <span>(Rege 500)</span> it localizes near the wall. Furthermore, confinement reduces streamwise displacement and circulation by narrowing the effective cross section and intensifying the wall-attached vorticity layer. Decreasing <i>Re</i> suppresses roll-up of this layer, thereby allowing longer travel before viscous losses dominate. Lower <i>Re</i> also stabilizes the ring: no three-dimensionality is observed for <span>(Rele 500)</span> at any confinement, while at <span>(Re=1000)</span> azimuthal undulations arise under tighter confinement (<span>(D_C/D_0le 2.0)</span>) but remain absent for <span>(D_C/D_0=2.5)</span>, indicating that strong confinement lowers the Reynolds number threshold for breakdown.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4631 - 4652"},"PeriodicalIF":4.0,"publicationDate":"2026-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00707-026-04717-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A circular Eshelby inclusion with an imperfect interface in a finite domain 有限域上具有不完全界面的圆形Eshelby包含

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-07 DOI: 10.1007/s00707-026-04712-7

Xu Wang, Peter Schiavone

引用次数: 0

Thermally nonlinear electro-magneto-thermo-viscoelastic response of a spherical microshell induced by a sinusoidal ultra-short pulse 正弦超短脉冲诱导球形微壳的热非线性电磁-热粘弹性响应

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-05 DOI: 10.1007/s00707-026-04692-8

Wei Peng, Yanlong Hao, Jingsong Luan, Tianhu He, Shuangquan He

{"title":"Thermally nonlinear electro-magneto-thermo-viscoelastic response of a spherical microshell induced by a sinusoidal ultra-short pulse","authors":"Wei Peng, Yanlong Hao, Jingsong Luan, Tianhu He, Shuangquan He","doi":"10.1007/s00707-026-04692-8","DOIUrl":"10.1007/s00707-026-04692-8","url":null,"abstract":"<div><p>Ultra-short pulses have seen rapid development and wide application in the nano-machining of viscoelastic structures. Consequentially, the transient thermo-mechanical responses at the micro/nano scale have gained utmost importance. At the microscale, the significance of size-dependent effect in elastic deformation and memory-dependent effect in the heat transfer process cannot be ignored. Many experimental and theoretical investigations suggest that, in practical analyses, thermal conductivity in materials should not be considered as a constant value. To compensate for such a deficiency, this work formulates a nonlocal thermoviscoelastic model with memory-dependent effect. This model integrates the fractional-order three-phase-lag (FTPL) heat conduction model and the nonlocal elasticity theory. The FTPL heat conduction model is based on the Caputo-Fabrizio (CF) definition of the fractional derivative, which does not have a singular kernel. In terms of application, the nonlinear electro-magneto-thermo-viscoelastic response of a polymer spherical nanoshell with variable thermal conductivity heated by a sinusoidal ultra-short pulse under the effect of a magnetic field is studied. Taking into account the variable thermal conductivity, the nonlinear governing equations are derived. The Laplace and Kirchhoff transformations are employed to derive and solve the governing equations that incorporate the fractional-order parameter, the nonlocal parameter and the variable thermal conductivity. The results show that the nonlinear thermoviscoelastic response of the polymer spherical microshell can be adjusted by the suitably modified parameters, which strongly depend on the size-dependent effect, memory-dependent effect and the variable thermal conductivity.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4591 - 4613"},"PeriodicalIF":4.0,"publicationDate":"2026-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Superior auxeticity and vibration control in novel smart sandwich structures: A biomimetic approach integrated with multiscale mechanics 新型智能夹层结构的卓越互补性和振动控制：一种多尺度力学的仿生方法

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-03 DOI: 10.1007/s00707-026-04704-7

Bibhu Prasad Mahapatra, Rahul Chauhan, Prasun Jana

{"title":"Superior auxeticity and vibration control in novel smart sandwich structures: A biomimetic approach integrated with multiscale mechanics","authors":"Bibhu Prasad Mahapatra, Rahul Chauhan, Prasun Jana","doi":"10.1007/s00707-026-04704-7","DOIUrl":"10.1007/s00707-026-04704-7","url":null,"abstract":"<div><p>Auxetic meta-sandwich structures are well known for their excellent energy absorption, but they often fail due to core–face sheet debonding caused by vibration-induced fatigue. This study presents a novel auxetic sandwich panel with a bioinspired butterfly lattice core and dual functionally graded (FG) nanocomposite face sheets, for enhanced auxeticity and active damping. The lightweight metastructure integrates a piezoelectric sensor–actuator pair governed by a constant velocity feedback controller to suppress induced vibration in a closed-loop system. In contrast with computationally involved nonlocal homogenization approaches, an efficient multiscale framework is adopted that combines (1) RVE-based finite element (FE) homogenization to capture material anisotropy and negative Poisson’s ratio (NPR) of the auxetic core and (2) FSDT-based FE modeling with quadratic interpolation functions to solve dynamic motion equations, predicting transient response of the plate structure under active control. Parametric analysis reveals that cell wall thickness and total unit cell length of the architected core critically govern the core’s NPR (− 0.227 to − 0.097) and modal characteristics, while adding carbon nanotubes (CNTs) to the FG Al–ZrO<sub>2</sub> blend significantly elevates structural stiffness and inherent damping. Comparative studies show the butterfly auxetic sandwich structure (BASS) achieves superior auxeticity, whereas the re-entrant design (RASS) offers higher natural frequencies and improved vibration suppression at same material volume. Validated against benchmarks, the work establishes a paradigm for designing auxetic metastructures with tunable dynamic performance, emphasizing synergy between architectured cores, dual-FG CNT nanocomposites, and active control for fatigue-resistant applications.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4565 - 4589"},"PeriodicalIF":4.0,"publicationDate":"2026-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Gegenbauer shear deformation theory and a modified couple stress theory for size-effect analysis of functionally graded triply periodic minimal surface microbeams 基于Gegenbauer剪切变形理论和修正耦合应力理论的功能梯度三周期最小表面微梁尺寸效应分析

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-01 DOI: 10.1007/s00707-026-04716-3

Ngoc-Duong Nguyen

引用次数: 0

Thermoelastic vibration analysis of rotating honeycomb annular plates with agglomerated nanocomposite skins under exponentially decaying load based on a temperature-dependent zig–zag framework 基于温度相关之字形框架的含纳米复合材料表皮的旋转蜂窝环形板在指数衰减载荷下的热弹性振动分析

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-04-30 DOI: 10.1007/s00707-026-04675-9

Ehsan Arshid, Zahra Khoddami Maraghi, Parisa Rahimkhani

{"title":"Thermoelastic vibration analysis of rotating honeycomb annular plates with agglomerated nanocomposite skins under exponentially decaying load based on a temperature-dependent zig–zag framework","authors":"Ehsan Arshid, Zahra Khoddami Maraghi, Parisa Rahimkhani","doi":"10.1007/s00707-026-04675-9","DOIUrl":"10.1007/s00707-026-04675-9","url":null,"abstract":"<div><p>This study develops a comprehensive thermo-mechanical vibration model for rotating sandwich annular plates composed of nanocomposite facesheets and honeycomb core, supported by Kerr elastic foundation. The equations are derived using advanced zig-zag displacement theory combined with Hamilton’s principle, enabling accurate representation of interlaminar shear deformation and layerwise slope discontinuities without requiring shear-correction factors. To solve the coupled equations with high numerical stability and efficiency, the generalized differential quadrature method (GDQM) is employed. Temperature-dependent behavior of the honeycomb core and nanocomposite skins is incorporated through a modified Williams–Landel–Ferry model, allowing reliable prediction of stiffness variations under thermal loading. Additionally, an extended Mori–Tanaka scheme captures the influence of fiber agglomeration, illustrating how nonuniform nanoparticle dispersion alters effective elastic response. Parametric studies demonstrate that frequencies are sensitive to the foundation stiffness, core geometry, agglomeration intensity, and rotation speed. The results show that selecting appropriate Kerr foundation stiffness and optimizing core–face configurations can significantly enhance vibration resistance while reducing material usage. The proposed zig-zag–GDQM framework offers a versatile and computationally efficient tool for predicting the thermo-vibrational behavior of advanced rotating sandwich structures, supporting improved design of aerospace, mechanical, and energy systems requiring lightweight construction, vibration stability, and thermal reliability.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4471 - 4501"},"PeriodicalIF":4.0,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of interfacial stresses in helicoidal FRP-strengthened RC beams under hygrothermal effects 热湿作用下螺旋frp加固RC梁界面应力预测

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-04-30 DOI: 10.1007/s00707-026-04715-4

Mokhtar Nebab, Rezki Amara, Hassen Ait Atmane, Fabrice Bernard, Riadh Bennai

{"title":"Prediction of interfacial stresses in helicoidal FRP-strengthened RC beams under hygrothermal effects","authors":"Mokhtar Nebab, Rezki Amara, Hassen Ait Atmane, Fabrice Bernard, Riadh Bennai","doi":"10.1007/s00707-026-04715-4","DOIUrl":"10.1007/s00707-026-04715-4","url":null,"abstract":"<div><p>The structural integrity of reinforced concrete (RC) members retrofitted with externally bonded composite laminates is primarily governed by complex interfacial stress transfer mechanisms, which are frequently compromised by manufacturing imperfections and aggressive environmental exposure. While conventional fiber-reinforced polymer strengthening is well established, the transition toward bio-inspired helicoidal Bouligand architectures offers a transformative approach to enhancing delamination resistance. However, the interfacial mechanics of these advanced configurations under coupled multi-physical loading remain insufficiently characterized. This study presents a robust computational framework leveraging high-precision artificial neural networks to evaluate interfacial shear and normal stress distributions in RC beams featuring stochastic air-void defects. Utilizing an extensive database of 63,975 data points, a multi-layer perceptron architecture was optimized to capture the high-dimensional nonlinear coupling between constitutive material properties, geometric configurations, and tri-stage loading. The model demonstrates exceptional predictive fidelity, yielding an overall correlation coefficient Rall = 0.99915. Principal results reveal that the bio-inspired helicoidal technique significantly homogenizes interfacial stress distribution, effectively mitigating peak concentrations at the plate ends. Parametric investigations demonstrate that optimizing the reinforcement density (12–32 layers) and fiber architecture facilitates a global reduction in peak interfacial shear and normal stresses by up to 40%. Notably, hygrothermal concentrations escalate debonding driving forces by up to 30%, while the helicoidal configuration attenuates the adverse effects of stochastic air-void defects. This research establishes the bio-inspired technique as a superior, computationally efficient alternative for the reliability-based design and optimization of resilient infrastructure.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4503 - 4532"},"PeriodicalIF":4.0,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A unified model for stall-induced vibration and flutter analysis of wind turbine blades 风力机叶片失速激振与颤振分析的统一模型

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-04-29 DOI: 10.1007/s00707-026-04702-9

Dehuang Gong, Jingwei Zhou, Fengming Li

{"title":"A unified model for stall-induced vibration and flutter analysis of wind turbine blades","authors":"Dehuang Gong, Jingwei Zhou, Fengming Li","doi":"10.1007/s00707-026-04702-9","DOIUrl":"10.1007/s00707-026-04702-9","url":null,"abstract":"<div><p>A unified theoretical model that is competent to analyze the stall-induced vibration (SIV) and flutter simultaneously is proposed to investigate the aeroelastic instabilities of wind turbine blades. Hamilton’s principle and the finite element method (FEM) are applied to establish the equation of motion of the blade, and the blade element theory is used to calculate the quasi-steady aerodynamic forces acting on the blade. The aero-damping and aero-stiffness matrices are obtained by linearizing the aerodynamic forces, and the boundaries of the aeroelastic instability of the blade are determined by solving eigenvalue problems. The theoretical model is verified by a wind tunnel experiment, in which both the SIV and classical flutter are measured, and the results show that the inflow angle range of SIV calculated by the theoretical model is reasonable, and the critical wind speed of flutter predicted by this theoretical model is also reasonable and conservative. By analyzing a 5 MW wind turbine blade, it is found that the stall-induced flapwise, edgewise and torsional vibrations will occur when the blade is in specific inflow angle ranges. Classical flutter will occur near the 0-degree inflow angle when the wind speed exceeds a certain limit. The vibration frequencies of SIV are close to the natural frequencies, while the flutter frequency obviously deviates from the natural frequencies of the blade.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4447 - 4469"},"PeriodicalIF":4.0,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On pull-in and stable vibration of a microplate due to symmetric electrostatic actuation 微孔板在对称静电驱动下的拉入和稳定振动

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-04-28 DOI: 10.1007/s00707-026-04722-5

I. V. Andrianov, W. T. van Horssen, S. G. Koblik, G. A. Starushenko

{"title":"On pull-in and stable vibration of a microplate due to symmetric electrostatic actuation","authors":"I. V. Andrianov, W. T. van Horssen, S. G. Koblik, G. A. Starushenko","doi":"10.1007/s00707-026-04722-5","DOIUrl":"10.1007/s00707-026-04722-5","url":null,"abstract":"<div><p>The vibrations of electrically and symmetrically actuated micro-rectangular plates are considered. Coulomb and geometric nonlinearities are taken into account, as well as small linear damping. The Berger model and the Kantorovich procedure are used, which allows one to reduce the original PDE to a nonlinear ODE. Based on this ODE, the dynamic pull-in phenomenon is investigated, i.e., the transition from the oscillatory regime to an attracting one is studied. An effective numerical algorithm to determine the voltage for which the system collapses is proposed. Furthermore, the bounds for the regions of parametric instability can be computed. Applications with only an AC voltage and various variants with combined AC and DC voltages were considered. The study was carried out for a wide range of AC voltage frequency variations, that is, from zero to twice the natural frequency of the linear plate. In all cases, the instabilities that arise are parametric in nature. Along with the study of the original nonlinear equation, its simplified versions are also considered. Linearization of the Coulomb nonlinearity leads to a Mathieu–Duffing equation with double parametric forcing. Neglecting the geometric nonlinearity, a Mathieu equation with double parametric forcing is obtained. An interesting conclusion of the numerical experiments is that linearization of the original nonlinear equation and its replacement by the Mathieu equation allow one to determine quite accurately the dynamic pull-in of a microplate upon which a symmetric electrostatic actuation is applied. Since the theory for Mathieu equation is well developed, it is possible to analytically determine the frequency of the parametric resonances of the system. This is important, since in the vicinity of the corresponding AC voltage frequencies, sharp decreases in the dynamic pull-in values occur.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4433 - 4445"},"PeriodicalIF":4.0,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dispersion analysis of Rayleigh waves in a self-reinforced layer over a magneto-elastic orthotropic substrate with a sliding interface 具有滑动界面的磁弹性正交各向异性基板上自增强层中瑞利波的色散分析

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-04-26 DOI: 10.1007/s00707-026-04705-6

Anisha Kumari, Santimoy Kundu, Sushmita Mandal

{"title":"Dispersion analysis of Rayleigh waves in a self-reinforced layer over a magneto-elastic orthotropic substrate with a sliding interface","authors":"Anisha Kumari, Santimoy Kundu, Sushmita Mandal","doi":"10.1007/s00707-026-04705-6","DOIUrl":"10.1007/s00707-026-04705-6","url":null,"abstract":"<div><p>This study explores the propagation of Rayleigh waves in a self-reinforced elastic layer over a magneto-elastic orthotropic gravitating half-space with sliding contact at the interface. The governing electromagnetic field equations are derived by using Maxwell’s equations under the assumption of a perfectly electric conductor, neglecting the displacement current. Analytical solutions are obtained using the variable separation technique to decouple the governing partial differential equations. The dispersion equations governing Rayleigh wave motion are formulated by imposing appropriate boundary conditions and slip-dynamic relations at the interface. The impact of magnetic field, initial stress, layer thickness, density and sliding parameter on Rayleigh wave phase velocity is analyzed. Numerical analysis and graphical visualization are employed via <i>Mathematica</i> software to investigate the dependence of phase velocity on wavenumber under varying material properties and interface conditions. The study highlights the significant influence of sliding contact and magnetic field strength on wave propagation characteristics. This model finds relevance in analyzing wave dynamics within geomagnetic settings and layered geophysical media, as well as in the development of advanced materials incorporating reinforced layers subjected to electromagnetic and gravitational influences.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4415 - 4432"},"PeriodicalIF":4.0,"publicationDate":"2026-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0