International Journal of Mechanical Sciences最新文献

{"title":"Kresling origami arrays: Structural design and bandgap modulation","authors":"Ji Zhang ,&nbsp;Yan Geng ,&nbsp;Changguo Wang","doi":"10.1016/j.ijmecsci.2025.110611","DOIUrl":"10.1016/j.ijmecsci.2025.110611","url":null,"abstract":"<div><div>Origami-inspired structural arrays demonstrate promising potential in the acoustic field due to their unique geometric configurations and mechanical properties. This study investigates the compressive characteristics and acoustic bandgap features of four origami column structures (Accordion, Kresling, Miura, and Yoshimura ori) through a combined experimental and theory approach. Mechanical testing results reveal that the Kresling origami structure exhibits superior deployable characteristics during compression, outperforming the other three origami structures in mechanical performance. The Kresling origami structure demonstrates pronounced acoustic sensitivity throughout its folding–unfolding cycle, featuring deployment-dependent and dynamically adjustable bandgap characteristics. Building upon these findings, we designed Kresling origami arrays by integrating cross origami, cut origami, and Miura origami as substrates combined with Kresling columns, respectively, to investigate their composite structural bandgap characteristics. Results have demonstrated that different combinations of origami structures exert a significant regulatory effect on overall acoustic performance, which establishes a theoretical basis for the design of new high-performance acoustic materials. Through systematic investigation, this study has not only established experimental data support and a theoretical framework for the acoustic application of origami structures but also enriched the fundamental understanding in the field of acoustic metamaterials.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"303 ","pages":"Article 110611"},"PeriodicalIF":7.1,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vibration model modification of fluted sandwich cylindrical shells","authors":"Bocheng Dong, Rui Zhao, Tianci Li, Jiasheng Chen, Kaiping Yu","doi":"10.1016/j.ijmecsci.2025.110606","DOIUrl":"https://doi.org/10.1016/j.ijmecsci.2025.110606","url":null,"abstract":"Focusing on the current state of research on the rough theoretical modelling of fluted cylindrical shell structures that can be used as lightweight engineering components, the present study aims to overcome the unreasonable geometric feature characterization, inaccurate equivalent density, and crude equivalent modulus approximation of the cylindrical fluted core in existing models by employing rigorous theoretical derivations. For the first time, a revised vibration model is proposed in the present work to achieve higher precision prediction outcomes for the natural frequency and impulse response of fluted sandwich cylindrical shells. In addition, the constraint forms of boundary conditions are enriched via the virtual spring skill, and specific constraint conditions are relaxed to a continuous elastic constraint state to facilitate the various boundary simulations. The theoretical framework is constructed, the standardized characterizations of the geometrical features of the cylindrical fluted core are regulated, and the exact equivalent density calculation formulas are determined, with the elastic moduli being improved and corrected. Relying on the first-order shear deformation theory and the generalized Hooke's law, the displacement fields and constitutive relations of fluted sandwich cylindrical shells are established, and the dynamic equations are derived through the Rayleigh-Ritz method, with the eigenvalues and eigenfunctions solved therein to obtain the natural frequencies and mode shapes. The transient responses under the triangular, rectangular, exponential, and half-sine impulse excitations are formulated by the Newmark-Beta numerical path. The desired model parameters and their selection criteria are extracted from conducting the convergence analysis, and the numerical validations are then carried out by comparing the calculation results of the proposed model with full-size finite element simulations, and the errors of the uncorrected model results and the numerical advantages of the corrected model are quantified. The influencing laws of key configuration changes on the frequency and response manifestations of such structures are revealed, which can contribute to citation benchmarks and design references for subsequent research.","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"37 1","pages":""},"PeriodicalIF":7.3,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Atomistic study of radiation-induced ductile-to-brittle transition in austenitic steel","authors":"A. Ustrzycka ,&nbsp;H. Mousavi ,&nbsp;F.J. Dominguez-Gutierrez ,&nbsp;S. Stupkiewicz","doi":"10.1016/j.ijmecsci.2025.110567","DOIUrl":"10.1016/j.ijmecsci.2025.110567","url":null,"abstract":"<div><div>Neutron irradiation in structural alloys promotes defect clustering, which suppresses plasticity and triggers a ductile-to-brittle transition (DBT), a key degradation mechanism limiting fracture resistance in nuclear materials. This study investigates the fracture mechanisms underlying this transition in irradiated Fe–Ni–Cr alloys. Using Molecular Dynamics simulations, we examine how different defect types influence crack propagation and energy dissipation mechanisms. The results reveal distinct roles of these defects: voids facilitate crack growth by reducing local cohesive energy, while dislocation loops act as barriers that impede crack advancement and redirect crack paths, significantly altering crack morphology. Building on the classical approach of separating fracture energy into brittle cleavage and plastic components, this study adapts the decomposition to irradiated materials. This framework quantifies the evolving contributions of surface energy and plastic work across increasing radiation damage levels, providing critical insight into how irradiation-induced defects govern fracture dynamics.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"303 ","pages":"Article 110567"},"PeriodicalIF":7.1,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Topography measurement-integrated non-immersion CRECM: Process design and experimental investigation","authors":"Lixin Zhu ,&nbsp;Dengyong Wang ,&nbsp;Shilong Cao ,&nbsp;Jianfei Ren","doi":"10.1016/j.ijmecsci.2025.110607","DOIUrl":"10.1016/j.ijmecsci.2025.110607","url":null,"abstract":"<div><div>Counter-rotating electrochemical machining (CRECM) offers significant advantages for manufacturing large thin-walled rotary components. However, conventional immersed flow fields face critical challenges such as byproduct accumulation, uncontrollable stray corrosion, and the absence of real-time monitoring. To address these issues, this study is the first to propose a non-immersion flow field process for CRECM, integrated with an topography measurement system for real-time monitoring. The optimized flow field design overcomes the limitations of conventional configurations and creates favorable conditions for in-situ process control. Flow field simulation and experimental results show that the dual-side alternating electrolyte supply mode achieves the best performance, with a surface roughness of 1.2 μm, a material removal rate of 6.14 cm³/min, and reduced rib symmetry deviation from 0.13 mm to 0.02 mm. The integrated topography measurement system provides real-time monitoring of surface profiles and corrosion depth <em>d</em>, facilitating mechanism analysis, early detection of deviations, and minimizing errors caused by offline inspection and re-clamping. Monitoring results reveal that rib asymmetry becomes significant under single-side electrolyte supply when rib height exceeds 0.5 mm.This synergy effectively resolves the long-standing challenge of \"blind machining–passive scrapping\" and provides a viable solution for high-efficiency, high-precision machining of rotary components.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"303 ","pages":"Article 110607"},"PeriodicalIF":7.1,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of tesla valves on turbine blade tip leakage","authors":"Zeda Dong,&nbsp;Yue Sun,&nbsp;Le Cai,&nbsp;Fengbo Wen","doi":"10.1016/j.ijmecsci.2025.110609","DOIUrl":"10.1016/j.ijmecsci.2025.110609","url":null,"abstract":"<div><div>This paper introduces a novel blade tip design that incorporates the unidirectional flow control technology of Tesla valves, aiming to manage the tip leakage flow in turbines. In this paper, Tesla valves are applied to the tip of a high load turbine blade, and the effectiveness is investigated. This paper analyzes the flow field characteristics, the composition of the vortices, and the loss distribution to understand the working principle of this method. Furthermore, the paper delves into the specific effects of various Tesla valve configurations on the aerodynamic performance of the blade. This study reveals that the unique branching design of Tesla valves creates resistance for the fluid. Due to Tesla valves being machined into the blade tip as grooves, this kind of resistance generates vortices when the leakage flow is obstructed by the grooves. The existence of these vortices disrupts the leakage flow in the upper clearance. Compared to a flat blade tip cascade (Case 1), when Tesla valves are arranged in the crosswise direction (Case 2), perpendicular to the pressure side (Case 3), and in specific orientations aligned with the leakage flow direction (Cases 4–6), the total leakage flow rate is reduced by 4.8 %, 5.9 %, 3.6 %, 5.1 %, and 6.2 % respectively, while the total pressure loss is decreased by 0.7 %, 1.4 %, 4.8 %, 6.8 %, and 8.3 % respectively. Additionally, the paper investigates the effect of the Tesla-valve tip at various incidence angles. The results indicate that Tesla valves effectively reduce the blade tip leakage flow rate and weaken the strength of the tip leakage vortex (TLV) at different incidence angles. The novelty of this study is that this new tip leakage control technology effectively utilizes the unidirectional flow characteristics of the Tesla valve, which has a significant hindrance to the leakage fluid of the turbine tip, reduces the leakage flow rate, and improves the aerodynamic performance of the turbine blade.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"303 ","pages":"Article 110609"},"PeriodicalIF":7.1,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Self-restoring energy dissipation mechanism via a contact-driven buckling mode transition","authors":"Seunggyu Lee, Jongmin Shim, Phill-Seung Lee","doi":"10.1016/j.ijmecsci.2025.110610","DOIUrl":"https://doi.org/10.1016/j.ijmecsci.2025.110610","url":null,"abstract":"This study proposes a novel self-restoring energy dissipation mechanism based on contact-driven buckling mode transition in a slender elastic column. The mechanism consists of a column adjacent to a parallel wall that enables the following sequential transitions through distinct buckling modes during a prescribed compressive displacement loading cycle: pre-contact, one-point contact, line-contact, and two-point contact. The sequence concludes with a snap-through to the opposite side followed by recovery to the initial configuration upon unloading. The resulting hysteresis in the force-displacement curve allows for passive and effective energy dissipation, while the structure elastically recovers its original configuration to enable repeatable use. Two types of boundary conditions are considered: fixed-fixed and pinned-pinned. The proposed mechanism is validated through desktop-scale experiments, finite element simulations, and analytical modeling based on the Elastica approach. Parametric studies highlight the influence of column-wall spacing on the operating limits and energy dissipation characteristics. The mechanism provides a simple and scalable basis for structural applications where reusability and passive damping are required.","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"13 1","pages":""},"PeriodicalIF":7.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Finite torsion of transversely isotropic compressible hyperelastic circular cylinders","authors":"Michele Bacciocchi, Angelo Marcello Tarantino","doi":"10.1016/j.ijmecsci.2025.110582","DOIUrl":"https://doi.org/10.1016/j.ijmecsci.2025.110582","url":null,"abstract":"The paper develops an analytical formulation able to study the finite torsion problem for circular cylinders made of transversely isotropic compressible material. To this end, a three-dimensional displacement field is introduced a priori to take into account the large twisting of a cylindrical body, including both a variation of length in the longitudinal direction and a radial constant contraction. A transversely isotropic hyperelastic material is obtained by combining the stored energy function that characterizes the Mooney–Rivlin model for compressible and isotropic constituents with the standard reinforcing model as far as the anisotropic part is concerned. The nonlinear analyses are carried out analytically in both Lagrangian and Eulerian frameworks aiming at the evaluation of the corresponding stress components, which are respectively included in the Piola–Kirchhoff and Cauchy tensors, once the kinematic unknowns are computed. The problems of free torsion and restrained torsion are considered to investigate the mechanical behavior of the hyperelastic bodies in terms of twisting moment and axial response (force or longitudinal displacement, depending on the boundary conditions). Finally, the influence of the transverse isotropy on the stresses is discussed.","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"50 1","pages":""},"PeriodicalIF":7.3,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vortex shedding suppression in elliptical cylinder via reinforcement learning","authors":"Wang Jia,&nbsp;Hang Xu","doi":"10.1016/j.ijmecsci.2025.110517","DOIUrl":"10.1016/j.ijmecsci.2025.110517","url":null,"abstract":"<div><div>Flow control of bluff bodies plays a critical role in engineering applications. In this study, deep reinforcement learning (DRL) is employed to develop flow control strategies for the flow past an elliptical cylinder confined between two walls. The primary objective is to investigate the feasibility of achieving multi-objective flow control for an elliptical cylinder with varying aspect ratios (<span><math><mrow><mi>A</mi><mi>r</mi></mrow></math></span>), while maintaining low control energy input. DRL training results demonstrate that for an elliptical cylinder with larger <span><math><mrow><mi>A</mi><mi>r</mi></mrow></math></span>, the control strategy effectively reduces drag, minimizes lift fluctuations, and completely suppresses vortex shedding, all while maintaining low external energy consumption. Conversely, decreasing the <span><math><mrow><mi>A</mi><mi>r</mi></mrow></math></span> compromises the effectiveness of multi-objective control, even when greater energy input is applied. Through detailed physical analysis, the coupling effect between the blockage ratio (<span><math><mi>β</mi></math></span>) and <span><math><mrow><mi>A</mi><mi>r</mi></mrow></math></span> is identified as a limiting factor for vortex shedding suppression and wake stabilization. At lower values of <span><math><mi>β</mi></math></span>, the control strategy successfully achieves multi-objective optimization for elliptical cylinders across the entire range of <span><math><mrow><mi>A</mi><mi>r</mi></mrow></math></span>. Although balancing energy efficiency and control performance remains challenging for highly slender cylinders, the proposed DRL strategy still achieves effective vortex shedding suppression. This work highlights the potential of DRL-based control strategies to effectively stabilize wake flows around slender bluff bodies, with an explicit emphasis on maintaining energy efficiency.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"302 ","pages":"Article 110517"},"PeriodicalIF":7.1,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Self-excited vibration suppression in floating splined rotor systems via a composite spline ring","authors":"Yingjie Li, Guang Zhao, Yunbo Yuan, Xiaole Guan, Bingshan Kang, Zhaoyang Liu","doi":"10.1016/j.ijmecsci.2025.110598","DOIUrl":"https://doi.org/10.1016/j.ijmecsci.2025.110598","url":null,"abstract":"Floating splined rotor systems with metal splines are susceptible to friction-induced self-excited vibrations under supercritical conditions. To suppress this nonlinear vibration, this paper introduces a novel self-lubricating composite spline design as a replacement for conventional metal splines. The proposed configuration integrates a self-lubricating spline ring between conventional mating internal and external splines, forming a composite structure with two engaging spline pairs (one circular-arc and one involute). A dedicated dynamic model incorporating newly developed spline stiffness and damping formulations is established to give a thorough understanding of self-excited vibration suppression mechanisms. The spline stiffness formulation is derived from deformation compatibility theory and is suitable for both dual-engagement composite spline and single-engagement conventional spline, and the spline damping formulation accounts for both friction-induced damping and material dissipation damping. Comparisons of modal property and dynamic response results validate good accuracy of the proposed models. Both numerical simulation and experimental measurement demonstrate that the composite spline has good self-excited vibration and critical speed resonance suppression capabilities. Intrinsic vibration suppression mechanisms of composite splines are addressed through critical parameter sensitivity analysis. Combinations of higher elastic modulus and lower friction coefficient are desirable for optimal spline ring material selection to enhance suppression performance.","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"13 1","pages":""},"PeriodicalIF":7.3,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Asynchronous contact modeling incorporating edge effects: Application to gear systems","authors":"Yang Zhang,&nbsp;Lixin Xu","doi":"10.1016/j.ijmecsci.2025.110600","DOIUrl":"10.1016/j.ijmecsci.2025.110600","url":null,"abstract":"<div><div>Many mechanical systems involve multiple interacting contact surfaces, where interference can significantly alter intended conditions. In gear transmissions, continuous meshing depends on coordinated multi-tooth engagement. Surface deviations and operational disturbances may induce asynchronous contact, modifying meshing behavior and load distribution. This study establishes a modeling framework to characterize asynchronous contact, explicitly incorporating multiple surface interference mechanisms. The model employs surface gap to characterize surface interactions, defining an initial contact state to quantify interference. The core of the contact algorithm is an iterative procedure that adjusts deformation to match the contact force under multi-surface interference conditions. Each contact region is treated as a complete or incomplete elliptical contact, determined by local profiles and proximity to surface boundaries. Cylindrical contact cases are simulated and validated through finite element analysis, while gear transmission analyses are conducted based on the developed model. Results reveal that micrometer-scale asynchronous contact induces substantial load imbalance, with local load deviations up to an order of magnitude higher than those in adjacent regions, indicating the extreme sensitivity of multi-surface contact systems to minor surface deviations.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"302 ","pages":"Article 110600"},"PeriodicalIF":7.1,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}