International Journal of Mechanical Sciences最新文献

{"title":"Nonlinear dynamics analysis of bi-directional sliding guide system","authors":"Guangyong Song ,&nbsp;Changyou Li ,&nbsp;Zhi Tan ,&nbsp;Wei Sun ,&nbsp;Hang Lu ,&nbsp;Guocheng Lv","doi":"10.1016/j.ijmecsci.2025.110462","DOIUrl":"10.1016/j.ijmecsci.2025.110462","url":null,"abstract":"<div><div>The complex vibration behavior of bi-directional sliding guide system directly affects the machining accuracy and stability of the machine tool. In this paper, a new multi-degree-of-freedom nonlinear dynamics model is proposed for the bi-directional sliding guide system of CNC machine tool. Unlike conventional approaches that consider only a single degree of freedom, this study develops a fully coupled 16-degree-of-freedom model to simulate the spatial dynamics of the bi-directional sliding guide system, capturing both translational and rotational motions. Furthermore, the model uniquely integrates the sliding guide and ball screw mechanisms along both the X- and Y-axis feed directions, comprehensively capturing their coupled behavior within the machine's feed system. A hybrid contact modeling strategy is employed, wherein Hertzian contact theory is used to derive the nonlinear restoring forces of the ball screws and bearings. Additionally, the combination of fractal theory and slicing method is innovatively used to describe the complex stiffness of the bonding surface of sliding guide under multi-directional loading. Dynamic experiments at different excitation frequencies confirm the accuracy and reliability of the proposed model. Parametric analyses reveal that key parameters such as fractal dimension, preload and contact angle have a significant effect on the vibration behavior of the system. By adjusting these parameters, the vibration behavior of the system can be improved. This study provides a theoretical foundation for optimizing the performance of bi-directional sliding guide systems.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110462"},"PeriodicalIF":7.1,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305052","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":"Peridynamic modeling of interfacial failure in 3D-printed concrete","authors":"Yuhang Duan ,&nbsp;Chuan Wang ,&nbsp;Binbin Yin ,&nbsp;K.M. Liew","doi":"10.1016/j.ijmecsci.2025.110490","DOIUrl":"10.1016/j.ijmecsci.2025.110490","url":null,"abstract":"<div><div>Given its superior merits, 3D-printed concrete (3DPC) has transformative implications for the development of digital and green buildings. However, the poor interfacial properties of 3DPC may hinder the widespread adoption of 3DPC, as the construction industry is inherently risk-averse. To address this challenge, we propose a robust peridynamics model to predict interlayer bond strength and realistic crack propagation paths accurately. Assuming that the pore structure in the interfacial region is the primary factor affecting interfacial adhesion, a novel interfacial-controlled peridynamics model is developed using poroelasticity. By introducing a straightforward relation between interface and matrix fracture energy, our numerical model gains another significant advantage: its simplicity, as only one coefficient needs to be calibrated. The effectiveness and reliability of the proposed framework are validated through several numerical examples. Furthermore, as a first attempt, we investigate the interfacial failure of 3DPC, considering the filament heterogeneity under complex loading patterns. The competition between crack penetration and kinking modes of 3DPC is investigated. The results show that such competition significantly influences the final damage distribution, thereby offering valuable guidance for early prevention strategies. The present work provides deeper insights into the interfacial fracture behavior of 3DPC and lays the theoretical groundwork for its practical and large-scale implementation.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110490"},"PeriodicalIF":7.1,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305049","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 suppression of two-panel structure via stiffness-tunable joints","authors":"Wei Hu ,&nbsp;Ziqi Zhou ,&nbsp;Shangyang Zhou ,&nbsp;Renjian Hao ,&nbsp;Tao Chen ,&nbsp;Tao Sun","doi":"10.1016/j.ijmecsci.2025.110487","DOIUrl":"10.1016/j.ijmecsci.2025.110487","url":null,"abstract":"<div><div>Spacecraft solar panels, characterized by low stiffness and weak damping, are prone to produce continuous low-frequency and large-amplitude vibrations under external disturbances in microgravity. To address these challenges, a semi-active method for low-frequency vibration mitigation in spacecraft solar panels using novel Magnetically-Controlled Stiffness-Tunable (MCST) joints is introduced in this study. First, a new configuration of a panel-type spacecraft with multiple MCST joints is proposed, featuring three outstanding advantages: electromagnetic direct-drive, integrated structure and function, and vibration suppression through frequency shift via joint variable stiffness. Second, an analytical dynamic model for a two-panel structure connected by MCST joints is developed using the Rayleigh-Ritz method, explicitly incorporating joint dimensions, mass, and rotational inertia. Then, the natural frequencies and corresponding global mode shapes are determined. Finally, an experimental platform of the two-panel system was constructed to simulate space microgravity conditions. The effectiveness and precision of GMM were confirmed through comparative studies of dynamic models obtained by global mode method (GMM), finite element method (FEM), and experiments. Furthermore, ultra-low-frequency (0.01 Hz) vibration suppression was achieved under non-contact hybrid excitation composed of permanent magnetic and airflow. The results indicated the amplitude reductions of 80.27 % for Panle-1 and 75.16 % for Panle-2 at 0.01 Hz, respectively. These findings present an innovative approach for controlling the low- and ultra-low-frequency vibrations in large space flexible hinged panels.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110487"},"PeriodicalIF":7.1,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280529","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":"Dynamics of flexible multi-stable origami with bio-inspired creases","authors":"Hesheng Han ,&nbsp;Banhai Yu ,&nbsp;Lihua Tang ,&nbsp;Na Zhao ,&nbsp;Dengqing Cao ,&nbsp;Yilong Wang","doi":"10.1016/j.ijmecsci.2025.110488","DOIUrl":"10.1016/j.ijmecsci.2025.110488","url":null,"abstract":"<div><div>Origami, an ancient art form, has attracted immense interest from scientists and engineers. However, the design space of corresponding structures is significantly limited by the rotation assumption of rigid origami creases. This study proposes a novel origami structure with multi-stable mechanisms by introducing extensible-torsional creases like natural folding structures, enhancing the geometric flexibility of classic four-crease vertex origami. A three-degree-of-freedom geometric model is developed to characterize the structural deformation. It is reduced to two degrees of freedom with the fixed-free geometric boundary conditions. The nonlinear dynamic equations of the system are derived using Lagrange’s Equation and solved by fourth-order Runge-Kutta method. The theoretical predictions are consistent with simulation results in ADAMS. With the dedicated theoretical model, multiple deformation paths of the origami structure corresponding to different configurations are discovered, as well as configuration transitions with supercritical pitchfork and saddle-node bifurcations. The origami structures with five and six stable equilibria are demonstrated. The bifurcations of their equilibria and corresponding inherent properties are investigated. Nonlinear dynamic behaviors, including period-doubling and chaotic motions, are explored. Experimental results further illustrate configuration transformations in the bi-stable and tri-stable structures under dynamic excitations. This work opens up new possibilities for designing innovative origami structures with multi-stable mechanisms, paving the way for advanced engineering applications such as deployable structures, metamaterials and robotics.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110488"},"PeriodicalIF":7.1,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305054","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-skinning polyurethane composites: Fatigue durability and thermomechanical degeneration mechanisms","authors":"Wang Pan ,&nbsp;Cuixia Wang ,&nbsp;Chao Zhang ,&nbsp;Hongyuan Fang ,&nbsp;Jing Wang","doi":"10.1016/j.ijmecsci.2025.110485","DOIUrl":"10.1016/j.ijmecsci.2025.110485","url":null,"abstract":"<div><div>Modern trenchless rehabilitation requires advanced materials combining durability with structural adaptability. A novel self-skinning polyurethane composite (SSPUC) featuring a density-dependent skin-core gradient structure was developed for such applications. Through an integrated approach of macromechanical testing, microstructural SEM characterization, and real-time self-heating monitoring, the fatigue durability and thermomechanical degeneration mechanisms under cyclic compression were systematically elucidated. Key findings indicate that elevated stress levels, accelerated loading frequencies, and augmented material densities collectively compromised fatigue resistance, though density revealed a paradoxical dual role: simultaneously lowering fatigue threshold while enhancing fatigue strength. Microstructural variations manifested through density-dependent morphological transitions in skin-layer thickness, interface geometry, and cell core configuration. Fatigue self-heating showed spatial heterogeneity and three-stage evolution of max. temperature paralleling fatigue damage. Fatigue degradation mechanisms were identified as synergistic processes involving mechanical deterioration (surface delamination, cell structure collapse) coupled with thermally-induced damage (polymer matrix melting). Quantitative multi-dimensional analysis established structural hierarchy evolution and self-heating accumulation as fundamental determinants of fatigue performance trajectories. These findings provide fundamental insights for optimizing gradient polymer composites in infrastructure rehabilitation applications.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110485"},"PeriodicalIF":7.1,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144272307","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":"Micro-failure mechanism of components via scaling method","authors":"Sijia Ren ,&nbsp;Taipeng Guo ,&nbsp;Ye Yuan ,&nbsp;Ruidong Yan ,&nbsp;Juan Xia ,&nbsp;Zhentao Liu ,&nbsp;Weiqing Huang","doi":"10.1016/j.ijmecsci.2025.110450","DOIUrl":"10.1016/j.ijmecsci.2025.110450","url":null,"abstract":"<div><div>Accurately identifying microscopic failure mechanisms is essential for the safety of transportation systems. However, traditional methods, constrained by component macrostructures, often rely solely on material properties to evaluate performance, leading to potential inaccuracies in failure analysis. This paper proposes a novel macro/micro-scale component scaling method (MMCSM) to maintain micro-failure mechanism consistency before and after scaling. A diesel engine cylinder partition is used as a case study, where failure mechanisms are explored through the equivalent part obtained via MMCSM, coupled with microstructural characterization and simulation. Results reveal significant deviations from prior studies that considered only material properties, which suggested brittle fracture mechanisms. The equivalent part's macrostructure modifies internal micro-stress fields, yielding critical observations: (i) cracks are forced to propagate along a tortuous path within the matrix over an extended distance, and (ii) the direction of the maximum energy release rate (<em>G</em>) near the graphite phase shifts toward the matrix side. Thus, the graphite/matrix interface remains intact, transitioning the failure mechanism from brittle fracture to ductile fracture dominated by plastic deformation, thereby enhancing fatigue resistance. This approach bridges the macro and micro domains of components, providing insights into true failure mechanisms and contributing to the safe operation of engineering components.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110450"},"PeriodicalIF":7.1,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144272409","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 insights of inconel 690 L-DED process with varying beam diameters","authors":"Kaiyuan Peng ,&nbsp;Yu Kong ,&nbsp;Jiacheng Yang ,&nbsp;Jiangtao Hu ,&nbsp;Haihong Huang","doi":"10.1016/j.ijmecsci.2025.110486","DOIUrl":"10.1016/j.ijmecsci.2025.110486","url":null,"abstract":"<div><div>Controlling laser beam diameter in laser-directed energy deposition (L-DED) offers an effective means to tailor microstructural evolution in high-chromium nickel-based alloys (Inconel 690). However, conventional simulations and in-situ characterization remain limited in resolving localized melting and solidification at relevant spatial and temporal scales. To address this, a molecular dynamics (MD) model is developed that incorporates the effect of laser movement by applying a directional temperature gradient within semi-elliptical meltpool domains of varying sizes. The model captures meltpool formation, grain evolution, and element segregation at the atomic scale. Simulations reveal that Cr tends to segregate at grain boundaries due to local energy minimization, and grain morphology transitions from equiaxed to columnar structures depending on the interplay between cooling rate and thermal gradient. Small meltpools predominantly exhibit equiaxed grains, while large meltpools favor columnar growth near the bottom and equiaxed grains at the top. Experimental validation was performed using a pre-placed powder L-DED method, with EBSD characterization confirming trends consistent with MD predictions in terms of grain morphology and distribution. Finally, potential applications of the variable-beam-diameter L-DED strategy are proposed. This study provides new atomic-scale insights into how beam diameter influences solidification behavior and microstructure formation, advancing the design of high-performance L-DED processes.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110486"},"PeriodicalIF":7.1,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305053","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":"Physics-informed neural networks for topological metamaterial design and mechanical applications","authors":"Kangkang Chen ,&nbsp;Xingjian Dong ,&nbsp;Penglin Gao ,&nbsp;Qian Chen ,&nbsp;Zhike Peng ,&nbsp;Guang Meng","doi":"10.1016/j.ijmecsci.2025.110489","DOIUrl":"10.1016/j.ijmecsci.2025.110489","url":null,"abstract":"<div><div>With the advancement of metamaterials, topological metamaterials have shown great potential in acoustics, optics, and mechanical engineering due to their unique physical properties. However, traditional design methods often rely on experience and trial-and-error approaches, making it difficult to fully capture complex physical phenomena and achieve specific design objectives. Therefore, advanced computational tools are essential to improve design efficiency and accuracy. In this study, we propose a physics-informed deep learning model on the design of topological metamaterials, enabling low-frequency, broadband performance and flexible manipulation of waveguides in topological gradient metamaterials. First, we design a phononic crystal based on the local resonance principle, and establish a physical equivalent model to quantitatively evaluate the resonance frequency of the local resonator at the wave vector <em>K</em> in the band structure. Next, we develop a physics-informed neural networks (PINN) model using an inverse design model and a pre-trained model, incorporating eigenfrequencies generated by the physical equivalent model into the loss function. The inverse design model can directly generate the design parameters after training, while the pre-trained model can facilitate the mapping from the design parameters to the dispersion relations. Moreover, using the proposed PINN model, we design the metamaterial to meet low-frequency and broadband objectives. Under the broadband design, the complete bandgap of the model expands by about six times compared to the initial sample. Under the low-frequency design, the minimum bandgap frequency reaches approximately 226 Hz. Finally, we explore the application of the designed topological gradient metamaterial in energy localization and waveguide control. In summary, this study addresses the limitations of traditional design methods in the inverse design of topological metamaterials, facilitating their implementation in vibration control, energy capture, and information transmission.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"301 ","pages":"Article 110489"},"PeriodicalIF":7.1,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144305055","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":"Invar alloy metamaterial with high vibration and thermal expansion stability","authors":"Rui Zeng ,&nbsp;Junfeng Qi ,&nbsp;Lixia Xu ,&nbsp;Yaodong Yang ,&nbsp;Shengyu Duan ,&nbsp;Zeang Zhao ,&nbsp;Panding Wang ,&nbsp;Hongshuai Lei","doi":"10.1016/j.ijmecsci.2025.110481","DOIUrl":"10.1016/j.ijmecsci.2025.110481","url":null,"abstract":"<div><div>Metamaterials exhibiting extraordinary performance usually stem from the intentional promotion of one selected property, and the sacrifice of other secondary properties. In this study, by combining the strength of additive manufacturing and microstructural design, a type of ‘double-zero’ mechanical metamaterial has been proposed to realize quasi zero coefficient of thermal expansion (QZCTE) and quasi zero stiffness (QZS) at the same time. The curved unit cell is designed by symmetrically embedding multiple curved beams into planes or curved surfaces, and the parametric study is applied to program stiffness to achieve quasi zero stiffness and to verify static characteristics compared with the planar unit cell. Specimens are fabricated from Invar alloy by laser powder bed fusion (LPBF) and experimentally verified within the temperature range of 30–120 °C. Electron backscatter diffraction (EBSD) is produced to analyze the variation of coefficient of thermal expansion (CTE) at two orthogonal build orientations. The measured CTE of the metamaterial reaches 2.2 ppm/K, while the vibration isolation frequency is maintained below 35 Hz regardless of ambient temperature. The high thermal-mechanical stability and well vibration attenuation performance of the proposed metamaterial provide new ideas for the design of new multifunctional metamaterials.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110481"},"PeriodicalIF":7.1,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144261411","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":"Enhancing load-bearing in lattice structures via core-modified designs with secondary hardening","authors":"Liming Huang ,&nbsp;Jiafei Pang ,&nbsp;Quanfeng Han ,&nbsp;Jianxiang Wang ,&nbsp;Xin Yi","doi":"10.1016/j.ijmecsci.2025.110484","DOIUrl":"10.1016/j.ijmecsci.2025.110484","url":null,"abstract":"<div><div>The mechanical performance of singly oriented lattice structures is often compromised by strength degradation caused by the evolution of local deformation bands. To address this challenge, a novel structural design strategy is proposed that utilizes a secondary hardening response to suppress the propagation of local shear bands in lattice structures. Fabricated via selective laser melting with 316L stainless steel, these structures are evaluated combining experimental and finite element analysis. Results reveal that core-modified lattice structures exhibit remarkable secondary hardening under large compressive deformation, delaying the propagation of local deformation bands through multi-step deformation and self-strengthening of the modified cores. Unit cell simulations confirm that the novel design enhances elastic modulus while reducing elastic anisotropy. Geometric parameter analysis demonstrates that plastic plateau and secondary hardening stages can be tailored by adjusting geometric features. The deformation mechanism analysis further attributes the secondary hardening response to the spatial distribution of plastic hinges, providing insights for advanced structural design.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110484"},"PeriodicalIF":7.1,"publicationDate":"2025-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322311","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}