Acta Mechanica最新文献_第2页

Influences of surface/interface effects on the postbuckling of multilayered piezoelectric graded porous nanoscale beams 表面/界面效应对多层压电梯度多孔纳米梁后屈曲的影响

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-07-08 DOI: 10.1007/s00707-026-04821-3

Qinglu Li, Xiaojie Niu, Zhaoyi Pan

{"title":"Influences of surface/interface effects on the postbuckling of multilayered piezoelectric graded porous nanoscale beams","authors":"Qinglu Li, Xiaojie Niu, Zhaoyi Pan","doi":"10.1007/s00707-026-04821-3","DOIUrl":"10.1007/s00707-026-04821-3","url":null,"abstract":"<div><p>Although extensive studies have been conducted on the buckling behavior of nanoscale beams, the coupled influence of surface/interface effects in multilayered piezoelectric graded porous structures has not been fully addressed. To better investigate the influence of surface/interface effects on the buckling and post-buckling behavior of nanoscale beams, a multilayered piezoelectric graded porous nanobeam considering both surface and interface effects was established. The structural model is composed of a bulk layer, two interface layers, two piezoelectric layers, and two surface layers for a total of seven layers, in which the piezoelectric layers are close to the surface of the main body layer and carries the electric potential of the whole structure. Combining the Gurtin–Murdoch surface elasticity theory with the geometrical nonlinear beam theory, the post-buckling control differential equations about the nanobeams are established by linking some variables affecting the surface/interface effects. Afterwards, the post-buckling behavior of multilayer structured nanobeams about electromechanical coupling is investigated by shooting method of solution. Key parameters including surface effects, interface effects, small-scale effects, and piezoelectric effects on the nonlinear post-buckling of piezoelectric are nanobeams quantitatively analyzed.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 9","pages":"5905 - 5926"},"PeriodicalIF":4.0,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189228","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

Dislocation cell-based continuum crystal plasticity model for the size effect and strain jump plasticity deformation behavior of single crystal micropillar 基于位错单元的连续晶体塑性模型研究了单晶微柱的尺寸效应和应变跳变塑性变形行为

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-07-07 DOI: 10.1007/s00707-026-04817-z

Huili Guo, Xin Deng, Fulin Shang

{"title":"Dislocation cell-based continuum crystal plasticity model for the size effect and strain jump plasticity deformation behavior of single crystal micropillar","authors":"Huili Guo, Xin Deng, Fulin Shang","doi":"10.1007/s00707-026-04817-z","DOIUrl":"10.1007/s00707-026-04817-z","url":null,"abstract":"<div><p>Experiments have found that the size effect and strain jump during plastic deformation is dependent on the dislocation cells inside. Despite this, continuum crystal plasticity model of micropillar is built with weak connections to dislocation cells mechanisms. This work proposes a new continuum crystal plasticity model by considering the evolution of average size of dislocation cell walls and cell interiors. Additionally, to detect strain jump, second-order work criterion is introduced by considering the evolution of dislocation cell substructure. The proposed approach is implemented in finite element simulations of Ni micropillar specimens (diameter range: 5-20 μm). The simulation results demonstrate that the new model successfully captures both the size effect and strain jump phenomena, showing close alignment with experimental measurements. These specific plastic deformation behaviors, particularly the size effect and strain jump stem from variations in both the diameter of micropillars and the mean size of dislocation cell substructure. Moreover, the dislocation cell structure becomes more refined as plastic deformation intensifies.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 9","pages":"5821 - 5838"},"PeriodicalIF":4.0,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189224","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

Laser-induced nonlocal fractional thermoelastic fields in a damaged hollow cylinder with variable thermal conductivity 变导热中空损伤圆柱体激光诱导的非局部分数热弹性场

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-07-06 DOI: 10.1007/s00707-026-04820-4

Weaam Alhejaili, Amal S. Alali, Alaa A. El-Bary, Khaled Lotfy

{"title":"Laser-induced nonlocal fractional thermoelastic fields in a damaged hollow cylinder with variable thermal conductivity","authors":"Weaam Alhejaili, Amal S. Alali, Alaa A. El-Bary, Khaled Lotfy","doi":"10.1007/s00707-026-04820-4","DOIUrl":"10.1007/s00707-026-04820-4","url":null,"abstract":"<div><p>This study presents a generalized theoretical framework for analyzing laser-induced thermoelastic fields in a damaged hollow cylinder within the context of nonlocal fractional thermoelasticity with variable thermal conductivity. The model extends the classical formulation by incorporating Eringen’s nonlocal elasticity to capture internal length-scale effects, together with memory-dependent heat conduction described by Caputo fractional derivatives. The thermal conductivity is assumed to vary linearly with temperature and is treated using the Kirchhoff transformation to preserve analytical tractability under nonlinear heat transport conditions. A decaying laser pulse is applied at the inner surface of the cylinder, providing a realistic representation of transient surface heating. The governing coupled equations are formulated in cylindrical coordinates and solved using an appropriate transform-based technique. Numerical results are presented to examine the influence of the nonlocal parameter, fractional order, conductivity variation, laser decay parameter, and damage coefficient on the conductive temperature, displacement, and stress distributions. The results reveal that nonlocal effects significantly reduce stress concentration and smooth field gradients, while fractional memory delays thermal propagation and attenuates wave amplitudes. Linear conductivity variation alters thermal penetration depth and stress localization, and material damage, reducing stiffness while enhancing thermal accumulation. The proposed model provides improved predictions for laser-irradiated cylindrical structures in advanced engineering applications.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 9","pages":"5799 - 5819"},"PeriodicalIF":4.0,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189278","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

Wave dispersion analysis of natural fiber-reinforced composite sport arches on elastic foundations 弹性基础上天然纤维增强复合材料运动拱的波频散分析

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-07-06 DOI: 10.1007/s00707-026-04791-6

Jianbo Peng, Lingli Tan, Mostafa Habibi, Li Zhong

{"title":"Wave dispersion analysis of natural fiber-reinforced composite sport arches on elastic foundations","authors":"Jianbo Peng, Lingli Tan, Mostafa Habibi, Li Zhong","doi":"10.1007/s00707-026-04791-6","DOIUrl":"10.1007/s00707-026-04791-6","url":null,"abstract":"<div><p>In this study, the behavior of wave propagation in natural fiber-reinforced composite sport arches placed on elastic foundations was explored. A setup was constructed based on the Euler–Bernoulli beam theory, where both the bending of the arch and the foundation stiffness were taken into account. The effects of aging, through moisture and heat, were also included by introducing a hygrothermal degradation model. The wave characteristics were affected by changes in fiber content, opening angle of the arch, foundation parameters, and the passage of time. It was observed that when more fiber was included, the stiffness was increased, and the wave speed was boosted. However, that trend was not always linear, and some unexpected shifts were noticed after aging periods. Structures with wider curves were found to preserve wave speed better over time, especially when aged. By solving an eigenvalue problem derived from the governing equations, the wave frequency and phase velocity were obtained for different scenarios. These outcomes suggested that even small changes in shape or material could influence wave movement significantly. The findings may be used to guide the design of more efficient and eco-conscious components. A broader understanding of curved composite wave behavior was aimed to be offered through this work.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 9","pages":"5783 - 5797"},"PeriodicalIF":4.0,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189280","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

Tempered fractional MGT thermoelasticity in a transversely isotropic medium with temperature-dependent properties 具有温度相关性质的横向各向同性介质中的回火分数MGT热弹性

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-07-03 DOI: 10.1007/s00707-026-04796-1

Rozy Sharma, Pawan Kumar Sharma

{"title":"Tempered fractional MGT thermoelasticity in a transversely isotropic medium with temperature-dependent properties","authors":"Rozy Sharma, Pawan Kumar Sharma","doi":"10.1007/s00707-026-04796-1","DOIUrl":"10.1007/s00707-026-04796-1","url":null,"abstract":"<div><p>Many materials and physical systems show memory effects that gradually weaken with time but strongly influence their transient response, as seen in viscoelastic and thermoelastic materials. Tempered fractional operators provide an effective framework for capturing this behaviour by combining power-law memory with a natural exponential decay. Building on this idea, the present work develops a tempered fractional Moore–Gibson–Thompson (TFMGT) thermoelastic formulation to analyse the transient behaviour of a transversely isotropic medium with temperature-dependent material properties. The novelty of the present study lies in incorporating the tempered fractional operator and a two-dimensional (2D) transversely isotropic cylindrical medium within the considered framework. The medium is initially at rest and subjected to a ramp-type thermal load under traction-free boundary conditions. Temperature-dependent thermal and elastic parameters are included in the governing relations, leading to a strongly coupled thermomechanical system. The governing equations are non-dimensionalized and analytically solved in the Laplace–Hankel transform domain, and a numerical inversion technique is applied to obtain the physical responses for cobalt material. The results show that the fractional-order and tempering parameters significantly influence the overall spread of thermal and mechanical disturbances. The temperature-dependent parameter further intensifies coupling effects, altering the amplitude of field variables. The study provides a unified theoretical basis for examining memory-driven thermoelastic behaviour and offers guidance for designing materials with controlled thermal performance under transient loading.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 9","pages":"5757 - 5781"},"PeriodicalIF":4.0,"publicationDate":"2026-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188955","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

Fractional-order Green–Naghdi type-II model for biothermoelastic interaction in living tissues using the eigenvalue approach 基于特征值方法的活组织生物热弹性相互作用的分数阶Green-Naghdi ii型模型

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-07-02 DOI: 10.1007/s00707-026-04809-z

Zuhur Alqahtani, Ibrahim Abbas, Alaa A. El-Bary, Areej Almuneef

引用次数: 0

Fourier series solution for free vibration of double-walled nanotubes within the framework of nonlocal strain gradient theory 非局部应变梯度理论框架下双壁纳米管自由振动的傅立叶级数解

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-07-02 DOI: 10.1007/s00707-026-04752-z

Hayrullah Gun Kadioglu, Gokce Izgor Kadioglu, Mustafa Ozgur Yayli

{"title":"Fourier series solution for free vibration of double-walled nanotubes within the framework of nonlocal strain gradient theory","authors":"Hayrullah Gun Kadioglu, Gokce Izgor Kadioglu, Mustafa Ozgur Yayli","doi":"10.1007/s00707-026-04752-z","DOIUrl":"10.1007/s00707-026-04752-z","url":null,"abstract":"<div><p>In this study, the free vibration behavior of double-walled nanotubes is examined within the framework of the nonlocal strain gradient theory. The governing equations and moment expressions are derived, and a semi-analytical solution based on Fourier series expansion combined with Stokes transformation is employed for a system modeled with rotation-restricting boundary springs. Convergence analysis confirms that a 500-term approximation provides sufficient accuracy. The results indicate strong agreement with existing studies on both single- and double-walled nanotubes, validating the proposed formulation. A comprehensive parametric investigation is conducted, considering the effects of dimensionless frequencies, interlayer coupling, scale parameters, boundary conditions, and vibration modes. The findings indicate that the nonlocal scale parameter reduces system stiffness and frequencies, whereas the strain gradient parameter enhances stiffness and increases frequencies. These influences become more pronounced under stiffer boundary conditions and higher vibration modes. Additionally, increasing the interlayer coupling coefficient leads to a rise in frequencies, with the system asymptotically approaching the dynamic response of single-walled nanotubes.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 9","pages":"5715 - 5734"},"PeriodicalIF":4.0,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188977","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

Study on vortex configurations and critical current of defect-modulated superconducting thin films under stress-magnetic field coupling 应力-磁场耦合下缺陷调制超导薄膜涡旋结构及临界电流研究

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-07-02 DOI: 10.1007/s00707-026-04815-1

Yufeng Zhao, Jing Yu, Xianjie Lei

{"title":"Study on vortex configurations and critical current of defect-modulated superconducting thin films under stress-magnetic field coupling","authors":"Yufeng Zhao, Jing Yu, Xianjie Lei","doi":"10.1007/s00707-026-04815-1","DOIUrl":"10.1007/s00707-026-04815-1","url":null,"abstract":"<div><p>This study employs the finite element method to numerically simulate the equilibrium vortex states and critical state properties of defect-modulated superconducting thin films under stress-magnetic field coupling. The time-dependent Ginzburg–Landau equation is solved to characterize the pathways of vortex nucleation, penetration, and rearrangement towards static equilibrium configurations, revealing their intrinsic correlation with critical current properties. Numerical results indicate that, under an external magnetic field, static vortex structures with pronounced spatial dependence form in the superconductor, and their evolution sequence is strongly correlated with the magnetic field’s strength and direction. Notably, when the applied magnetic field deviates from the axial direction, the equilibrium vortex arrangement exhibits anisotropic properties. Systematic analysis under varying magnetic field inclinations yields quantitative data on vortex density distribution and reveals the symmetry-breaking phenomenon of the vortex lattice. Further analysis indicates that pre-strain conditions enhance the pinning potential gradient near defects by altering the coherence length and penetration depth, thereby stabilizing vortex configurations against depinning under highly tilted magnetic fields. The static boundary modulation effect on vortex arrangements under tilted fields is revealed, providing a foundation for predicting the current-carrying properties of superconducting materials in asymmetric magnetic field environments.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 9","pages":"5747 - 5756"},"PeriodicalIF":4.0,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149188978","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

Hybrid CFD–PINN modeling of laminar flow past a circular cylinder 圆柱层流的混合CFD-PINN模型

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-07-01 DOI: 10.1007/s00707-026-04779-2

Hung Tran-Nam, Hoai Thanh Nguyen

{"title":"Hybrid CFD–PINN modeling of laminar flow past a circular cylinder","authors":"Hung Tran-Nam, Hoai Thanh Nguyen","doi":"10.1007/s00707-026-04779-2","DOIUrl":"10.1007/s00707-026-04779-2","url":null,"abstract":"<div><p>This study investigates the application of Physics-Informed Neural Networks (PINNs) and a hybrid CFD–PINN framework for simulating steady laminar flow past a circular obstacle at <span>(Re=40)</span>. Comparative analysis reveals that while standalone PINNs can approximate the general flow field, it struggles to capture sharp velocity gradients, flow separation, and pressure variations with the same accuracy as traditional CFD solvers. The finite volume method (FVM) in OpenFOAM provides high-fidelity solutions in such regions but at a higher computational cost. The proposed CFD–PINN hybrid approach leverages the strengths of both methods, integrating physics-based solvers with data-driven learning. Results show that the CFD–PINN model closely matches the CFD predictions in both velocity and pressure fields, particularly near critical flow regions, while maintaining a computational cost only marginally higher than CFD alone. This hybrid framework offers improved generalization and robustness for flow simulations, particularly in cases with limited data or complex geometries. The study establishes a foundation for future research in machine learning enhanced CFD, highlighting the potential of CFD–PINN frameworks for efficient, accurate, and scalable simulations in engineering applications.\u0000</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 9","pages":"5691 - 5713"},"PeriodicalIF":4.0,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189028","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

Segment-dependent hierarchical frequency tailoring of rotating double-layer three-phase FGM joined conical–cylindrical shells via matrix gradation and GPL distribution 基于矩阵梯度和GPL分布的旋转双层三相FGM锥形圆柱壳分层频率裁剪

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-06-30 DOI: 10.1007/s00707-026-04784-5

Lei. Pang, Jinwu. Wu, Long Cheng, Chao Liu

{"title":"Segment-dependent hierarchical frequency tailoring of rotating double-layer three-phase FGM joined conical–cylindrical shells via matrix gradation and GPL distribution","authors":"Lei. Pang, Jinwu. Wu, Long Cheng, Chao Liu","doi":"10.1007/s00707-026-04784-5","DOIUrl":"10.1007/s00707-026-04784-5","url":null,"abstract":"<div><p>To achieve resonance-safe frequency tailoring of rotating joined shell structures, this study investigates the traveling wave vibration characteristics of joined conical–cylindrical shells (JCCSs) reinforced with graphene platelets (GPLs) and made of double-layer three-phase functionally graded materials, from the perspective of hierarchical material–structural design. A semi-analytical model is developed based on the first-order shear deformation theory, in which the boundary and junction constraints are represented by artificial springs, and the traveling wave frequencies are determined using the improved Fourier series method combined with the Rayleigh–Ritz procedure. The results show that the frequency tailoring behavior of the rotating JCCS exhibits a clear hierarchical structure. Within the investigated parameter range, the matrix-type combination establishes a baseline three-level frequency platform hierarchy. The segmental role is found to be geometry-dependent: For the present baseline configuration, the cylindrical segment mainly governs the platform ordering, whereas the conical segment mainly provides within-platform adjustment. The double-layer gradient exponents further regulate the accessible frequency range and the transitions between adjacent platform regions. GPL reinforcement mainly provides global frequency amplification and secondary fine-tuning without altering the matrix-controlled hierarchy; specifically, within the considered low-speed range, a GPL mass fraction of 1% increases the traveling wave frequencies by approximately 15%–18%. Under rotating conditions, the forward and backward traveling wave splitting, the critical speed intersections, and the resonance safety margin are strongly affected by rotational speed and boundary restraint. These results reveal a segment-dependent hierarchical tuning mechanism and provide a design-oriented basis for resonance-safe frequency tailoring of rotating joined shell structures.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 9","pages":"5665 - 5690"},"PeriodicalIF":4.0,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149190032","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