International Journal of Mechanical Sciences最新文献

{"title":"Particle migration mechanisms in in-situ laser shock assisted cored-wire WAAM","authors":"Furui Jiao ,&nbsp;Hao Yi ,&nbsp;Le Jia ,&nbsp;Huajun Cao ,&nbsp;Xianshan Dong","doi":"10.1016/j.ijmecsci.2025.110824","DOIUrl":"10.1016/j.ijmecsci.2025.110824","url":null,"abstract":"<div><div>In-situ laser shock (ILS) technology pioneers a novel strategy to combat particle inhomogeneity, specifically low-density particle floating-aggregation, in cored-wire arc additive manufacturing (CWAAM). However, a critical knowledge gap persists regarding the real-time particle migration, ILS-induced melt pool dynamics, and the fundamental mechanisms by which ILS suppresses flotation, hindering its advancement. To address this, we developed a sophisticated 3D transient multiphysics model integrating heat-mass transfer, fluid flow, and particle dynamics. This model uniquely elucidates the flotation-agglomeration mechanisms of low-density particles and reveals the underlying principles of ILS suppression. The results indicate that the Stokes number for most particles ranges between 0 and 0.1, signifying predominant entrainment by liquid flow. In the absence of ILS, the combined action of Marangoni convection and buoyancy forces drives particle migration towards the upper region, inducing agglomeration. Concurrently, high-speed flow entrains particles at the rear surface of melt pool. Furthermore, the drag force plays a critical role in particle motion, exhibiting dependence on the relative velocity between the fluid and particles. The application of ILS fundamentally alters the melt pool's flow field morphology. The formation of a multi-vortex flow field and the shift of high-velocity regions effectively suppress agglomeration, increasing the coefficient of variation for particle distribution by 23 %. Simultaneously, the reverse pressure (up to 11.57 kPa) generated by the pulsed laser effectively counteracts buoyancy-induced flotation, promoting downward particle movement. During this process, an equilibrium state occurs when the relative particle-fluid velocity is lower, whereby buoyancy, gravitational force, and drag force mutually counteract. At higher relative velocities, drag force predominance still facilitate particle ascent. This investigation into particle migration behaviour in CWAAM provides a significant theoretical foundation for the further development of WAAM technology.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"306 ","pages":"Article 110824"},"PeriodicalIF":9.4,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050710","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-calibration method for assembly errors of hemispherical resonator gyroscope","authors":"Ruiqi Wang ,&nbsp;Guoxing Yi ,&nbsp;Weinan Xie ,&nbsp;Zhennan Wei ,&nbsp;Shengwei Dong","doi":"10.1016/j.ijmecsci.2025.110811","DOIUrl":"10.1016/j.ijmecsci.2025.110811","url":null,"abstract":"<div><div>The assembly error calibration methods for Coriolis vibrating gyroscopes based on rate fluctuation heavily rely on external equipment and cannot track changes in assembly errors in real time. To address this issue, this paper proposes a self-calibration method for assembly errors based on virtual rotation modulation (VRM). First, a systematic association model between assembly attitude errors and channel coupling errors under the time-division multiplexing control scheme is established. Based on this, a coupling drift model of the hemispherical resonator gyroscope (HRG), incorporating channel coupling errors, is developed, revealing the control voltage coupling mechanism induced by assembly errors. Finally, a self-calibration method for assembly errors based on VRM is proposed according to the evolution pattern of the amplitude control voltage, eliminating the dependence on external equipment during the calibration process. Experimental results demonstrate that this method reduces the preheating time of a navigation-grade HRG from 2 h to 5 min, while decreasing the scale factor nonlinearity and bias instability by factors of 12.5 and 4.3, respectively, to only 0.79 ppm and 0.0108°/h. This study provides a new approach for the efficient calibration of axisymmetric vibrating gyroscopes, offering significant theoretical value and broad application potential.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"306 ","pages":"Article 110811"},"PeriodicalIF":9.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050708","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":"Dual superelasticity: A pathway to exceptional and modulable deformation","authors":"Xuhui Lou ,&nbsp;Xu Hou ,&nbsp;Ying Liang ,&nbsp;Haidong Fan ,&nbsp;Xu Liang ,&nbsp;Xu-Sheng Yang ,&nbsp;Yang Lu ,&nbsp;Wentao Jiang ,&nbsp;Qingyuan Wang ,&nbsp;Jiangyu Li ,&nbsp;Jie Wang ,&nbsp;Xiaobao Tian","doi":"10.1016/j.ijmecsci.2025.110817","DOIUrl":"10.1016/j.ijmecsci.2025.110817","url":null,"abstract":"<div><div>Inorganic ferroelectric materials often suffer from brittleness. Superelasticity is a notable stress-strain behavior characterized by the recovery of large amount of nonlinear “plastic” strains. This offers a promising approach to overcome the deformation limitation of inorganic ferroelectric materials, enabling their applications in sensors, actuators and dampers. However, precise modulation of superelasticity remains elusive, and further improvement of superelastic deformation is still essential. This paper reveals, for the first time, the critical role of shear elastic energy density as the fundamental mechanism governing superelasticity in these materials. Leveraging this insight, we predict and demonstrate a dual superelasticity behavior with excellent deformation ability, which is not realized in single-crystal ferroelectrics. This dual superelasticity behavior stems from the significant and sustained presence of shear elastic energy density. The diagram for superelastic behavior under the modulation of multi-fields reveals the existence of five distinct superelasticity states in single-crystal ferroelectrics. Crucially, the dual superelasticity delivers a remarkable 30.5 % improvement in total recoverable strain compared to a traditional none superelastic stress-strain curve, and a 17 % gain over a single superelasticity, representing a breakthrough in achievable deformation. The multi-levels superelastic behavior and the corresponding shear elastic energy density centered mechanism offer a solution specifically designed to address the brittleness drawback of inorganic ferroelectric devices especially under complex multi-fields environments.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"306 ","pages":"Article 110817"},"PeriodicalIF":9.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050712","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":"Dual-mode tension-shear model for soft staggered composites","authors":"Jiabao Bai ,&nbsp;Daochen Yin ,&nbsp;Yijie Cai ,&nbsp;Zihang Shen ,&nbsp;Genda Wang ,&nbsp;Zheng Jia","doi":"10.1016/j.ijmecsci.2025.110818","DOIUrl":"10.1016/j.ijmecsci.2025.110818","url":null,"abstract":"<div><div>Emerging advancements in bioinspired composite research have refocused attention on architecture-property interactions within staggered hard/soft phase systems, particularly in soft staggered composites. Classical tension-shear chain (TSC) models fail to predict modulus in soft staggered composites with moderate-to-low modulus ratios (&lt;1000) due to their neglect of soft-phase tensile contributions. To resolve this limitation, we develop a dual-mode tension-shear (DTS) constitutive model that unifies soft-phase tensile deformation and interfacial shear transfer. Validated by finite element analysis and heterogeneous ionogel experiments, the DTS model achieves high-accuracy modulus predictions across the full modulus-ratio spectrum (2–1000). Beyond infinitesimal strain characterization, DTS uniquely reconstructs full-range nonlinear stress-stretch responses without empirical calibration through phase-specific constitutive behaviors. This capability dramatically accelerates material development cycles. By bridging biomimetic theory with synthetic innovation, the framework enables optimized design of adaptive biomedical scaffolds, energy-dissipative metamaterials, and multifunctional tissue analogues.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"306 ","pages":"Article 110818"},"PeriodicalIF":9.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108174","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 network-based homogenization for architected lattice structures","authors":"Shuo Li ,&nbsp;Daming Nie ,&nbsp;Yu Zhang ,&nbsp;Li Li","doi":"10.1016/j.ijmecsci.2025.110783","DOIUrl":"10.1016/j.ijmecsci.2025.110783","url":null,"abstract":"<div><div>Pronounced size-dependent mechanical behavior is experimentally observed in architected lattice structures when the lattice constant varies, even under identical microstructural configurations. Conventional homogenization approaches, however, fail to capture this configuration-dependent size effect. To address this limitation, a physics-informed neural network (PINN)-based homogenization is proposed to homogenize architected lattice structures and solve the governing equations derived from the nonlocal strain gradient homogenization model (NSGHM) that incorporates high-order nonlocal integral terms. Two-phase NSGHM introducing dimensional nonlocal length and strain gradient length can characterize size effects arising from nonlocal interactions and strain gradient contributions. The PINN-based solver efficiently resolves the integro-differential equations derived from the NSGHM, overcoming computational bottlenecks inherent to nonclassical mechanics. The resulting PINN-based NSGHM framework accurately and efficiently predicts size-dependent mechanical responses of various lattice structures and demonstrates strong agreement with high-fidelity finite element simulations. This framework enables efficient and accurate multiscale modeling of architected materials, providing deeper insight into the configuration-driven size effects in lattice structures.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"306 ","pages":"Article 110783"},"PeriodicalIF":9.4,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050704","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":"Tribo-dynamics modeling of cycloidal gear-pin pair considering transient effects","authors":"Rui Li ,&nbsp;Pengyuan Zheng ,&nbsp;Gang Wang ,&nbsp;Guodong Li ,&nbsp;Shangkai Chi ,&nbsp;Xianghui Meng","doi":"10.1016/j.ijmecsci.2025.110809","DOIUrl":"10.1016/j.ijmecsci.2025.110809","url":null,"abstract":"<div><div>Rotating vector (RV) reducers are widely applied in heavy-duty robotics, yet their stability is often compromised by friction and wear at the interface between the cycloidal gear and pins. This study establishes a novel tribo-dynamics model specifically for the cycloidal gear-pin pair, filling a critical research gap in RV reducer analysis. Considering the transient effects such as pin motion and oil film squeezing, the model accurately captures the dynamics behavior, revealing that the pins follow an “<span><math><mi>∞</mi></math></span>”-shaped trajectory which significantly reduces the interface load compared to traditional fixed-pin assumptions. Furthermore, the analysis shows that asperity contact becomes the dominant load-bearing mechanism during the late stage of engagement, when pin motion disrupts the lubricating oil film. The model also successfully predicts the wear region of the cycloidal gear with high accuracy; the simulated results are in good agreement with the experimental ones. These findings demonstrate the importance of considering the transient effects to enhance the understanding of lubrication, friction, and wear mechanisms in RV reducers, ultimately supporting enhanced reliability and service life.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"305 ","pages":"Article 110809"},"PeriodicalIF":9.4,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049496","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":"Anisotropic plasticity identification: Integrated FE and sensitivity-based virtual fields method","authors":"Seojun Hong ,&nbsp;Hyunki Kim ,&nbsp;Myoung-Gyu Lee","doi":"10.1016/j.ijmecsci.2025.110815","DOIUrl":"10.1016/j.ijmecsci.2025.110815","url":null,"abstract":"<div><div>An integrated virtual field method (VFM) framework has been developed for the first time by integrating finite element-based VFM (FE-VFM) and sensitivity-based VFM (S-VFM) approaches. This new methodology enhances computational efficiency while maintaining high accuracy in the inverse identification of constitutive model parameters. Full-field displacement measurements are mapped onto finite element meshes to improve data quality and reduce the number of measurement points. Sensitivity-based automatic virtual field generation is incorporated to robustly handle complex anisotropic plasticity models. The proposed approach has been validated using both noise-free virtual experimental data and actual experimental data from SUS316 stainless steel. Results demonstrate that Swift hardening law and quadratic Hill-48 yield function parameters can be accurately identified from a single specimen, achieving significantly reduced computational time compared to conventional VFM. Furthermore, for the first time, the non-quadratic Yld2000–2d anisotropic yield function parameters have been successfully identified using a single specimen with an additional cost function incorporating balanced biaxial tension data. This integrated VFM represents a novel and efficient inverse identification framework, enabling robust determination of complex anisotropic constitutive models with minimal testing.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"306 ","pages":"Article 110815"},"PeriodicalIF":9.4,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145061574","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":"Hybrid auxetics: Postponing failure with elastomer infiltration of Ti-6Al-4V lattices","authors":"Frédéric Albertini ,&nbsp;Justin Dirrenberger ,&nbsp;Cyrille Sollogoub ,&nbsp;Andrey Molotnikov ,&nbsp;Jérôme Adrien ,&nbsp;Eric Maire","doi":"10.1016/j.ijmecsci.2025.110704","DOIUrl":"10.1016/j.ijmecsci.2025.110704","url":null,"abstract":"<div><div>This work examines how a soft elastomeric phase can be used to reinforce and delay the failure of additively manufactured metal lattice structures with auxetic geometry. A novel hexaround unit-cell was designed to ensure printability of Ti-6Al-4V via laser powder-bed fusion. Once infiltrated with a compliant polyurethane, these hybrid lattices showed a pronounced delay in strut-level failure and shear-band formation. Microtomography coupled with in-situ compression experiments confirmed that nodal cracking commonly observed in unfilled lattices is mitigated by the polymer phase. While hybrid lattices exhibited comparable or slightly increased stiffness only at large deformations, their enhanced integrity and stress redistribution suggest promise for crashworthiness and impact applications requiring high ductility or energy absorption. We discuss how the stiffness ratio between filler and metallic skeleton determines the extent of improvement, offering design guidelines for next-generation hybrid lattices. This is the first in-situ tomographic evidence that a compliant matrix can defer the critical shear-band in an additively manufactured metal auxetic lattice.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"306 ","pages":"Article 110704"},"PeriodicalIF":9.4,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050711","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":"Isotactic inertial amplification metamaterials with superior low-frequency bandgap","authors":"Mengqi Yuan ,&nbsp;Jiamin Niu ,&nbsp;Jiu Hui Wu","doi":"10.1016/j.ijmecsci.2025.110812","DOIUrl":"10.1016/j.ijmecsci.2025.110812","url":null,"abstract":"<div><div>The integration of inertial amplification with metamaterials has facilitated the manipulation of low-frequency elastic waves in lightweight structures. However, conventional symmetric linkage inertial amplification structures are constrained by the connecting rod angle, limiting the amplification factor to &lt;10 times and often encountering the dead point at small angles. To overcome these limitations, this study introduces isotactic linkage inertial amplification metamaterials by breaking symmetry, which achieve an ultra-high amplification factor exceeding 20 times, thereby enabling a lower frequency bandgap without increasing the additional mass. A generalized theoretical framework for asymmetric configurations is developed by extending the traditional inertial amplification formula, and the superiority of isotactic metamaterials in low-frequency bandgap attenuation has been rigorously analyzed by the complex band. Experimental results demonstrate that the start frequency of bandgap in the continuous assembly isotactic configuration can be reduced to 37.53 Hz, representing a 42.8 % decrease compared to the traditional symmetric configuration. Moreover, a spaced assembly structure, utilizing only half the additional mass of the continuous assembly structure mentioned above, achieves comparable low-frequency performance, offering significant advantages for lightweight design. Additionally, the dead-point problem in link mechanisms is effectively resolved through the isotactic configuration. Isotactic inertial amplification metamaterials exhibit potential for applications in vibration isolation, elastic wave manipulation and energy harvesting, particularly in low-frequency scenarios.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"305 ","pages":"Article 110812"},"PeriodicalIF":9.4,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049495","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":"Genetic algorithm-based energy and safety optimization of dual-vortex fluid oscillator","authors":"Zhiqiang Duan ,&nbsp;Jialin Tian ,&nbsp;Yu He ,&nbsp;Lanhui Mao ,&nbsp;Qianrui Xiao ,&nbsp;Jianhua Deng","doi":"10.1016/j.ijmecsci.2025.110813","DOIUrl":"10.1016/j.ijmecsci.2025.110813","url":null,"abstract":"<div><div>The dual-vortex fluid oscillator (DVFO) generates periodic axial forces without relying on moving components, effectively reducing friction between the drill bit and the wellbore. However, minimizing the total pressure drop to conserve energy while maintaining optimal axial force for improved drilling safety poses a significant challenge. This study proposes a multi-objective optimization strategy that integrates adaptive sampling, two surrogate modeling methods, and genetic algorithms. Furthermore, enhanced evaluation metrics are employed to assess the fitting and predictive performance of these surrogate models. The results demonstrate that, based on the sample data obtained through adaptive sampling, the deep infinite mixture Gaussian process achieves exceptional accuracy, with all evaluation metrics exceeding 0.94. The optimized DVFO, with a 12.62 % increase in the average flow rate, achieves a 2.47 % reduction in the time-averaged total pressure drop and a 7.09 % reduction in the time-averaged axial force. Sensitivity analysis identifies channel thickness, shunt channel width, offset, and feedback channel width as the most influential parameters. A wider shunt channel, increased channel thickness, and smaller offset collectively reduce the vortex number and strength, thereby minimizing pressure loss. Additionally, the significant reduction in pressure and wall shear stress acting on the leading surface is the primary reason for the decrease in axial force. This research presents an efficient and adaptable strategy for optimizing transient DVFOs, underscoring the importance of geometric design in enhancing flow performance and providing valuable insights for similar fluidic systems.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"306 ","pages":"Article 110813"},"PeriodicalIF":9.4,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159340","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}