International Journal of Mechanical Sciences最新文献

{"title":"The temperature-dependent thermal conductivity of pressure-sintered graphene-ceramic matrix composites","authors":"Ke Zhao ,&nbsp;Chao Li ,&nbsp;Yingtao Zhao,&nbsp;Lina Yang,&nbsp;Yu Su","doi":"10.1016/j.ijmecsci.2025.110452","DOIUrl":"10.1016/j.ijmecsci.2025.110452","url":null,"abstract":"<div><div>In graphene-ceramic matrix composites (GCMC) prepared via pressure-assisted sintering, graphene fillers are typically aligned perpendicular to the pressure axis, leading to higher thermal conductivity along the alignment direction. However, theoretical predictions of thermal conductivity remain challenging due to multiple influencing factors, including interfacial thermal resistance, filler orientation, and ambient temperature. This study develops a multi-scale model that integrates molecular dynamics simulations and effective medium theory to account for these factors. Specifically, at the atomic scale, molecular dynamics simulations are used to precisely calculate the temperature-dependent interfacial thermal resistance between graphene and ceramics. At the mesoscale, a Gaussian distribution model is employed to characterize the orientation distribution of graphene fillers, with parameters optimized through experimental validation. Finally, the macroscopic temperature-dependent thermal conductivity of GCMC is determined through effective medium theory. The model's accuracy is validated against multiple experimental data, revealing the significant impact of ambient temperature on interfacial resistance and the temperature-dependent thermal transport mechanisms in GCMC.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110452"},"PeriodicalIF":7.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240007","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":"Dynamic responses of 2-D fractional medium subjected to impact","authors":"Liangzhu Yuan ,&nbsp;Songlin Xu ,&nbsp;Haifeng Yang ,&nbsp;Meiduo Chen ,&nbsp;Jianhua Lu ,&nbsp;Yushan Xie ,&nbsp;Ying Xiong ,&nbsp;Pengfei Wang","doi":"10.1016/j.ijmecsci.2025.110448","DOIUrl":"10.1016/j.ijmecsci.2025.110448","url":null,"abstract":"<div><div>It is of great significance to establish a new approach to investigate the 2-D dynamic responses of two-dimensional metamaterials with mesoscopic discontinuous structure due to their excellent anti-impact performance. The spatial fractional governing equations for the 2-D orthotropic medium subjected to impact are deduced, and their finite difference forms are given accordingly. The dynamic responses of the 2-D fractional medium are related to two fractional parameters, i.e., the fractional orders (<em>α</em>₁ and <em>α</em>₂) and the characteristic length (Δ<em>l</em>₁ and Δ<em>l</em>₂). The 2-D fractional medium shows greater flexibility in response simulation than the 1-D fractional medium. The plane-wave velocities of the 2-D fractional medium are obtained from the characteristics line method, and agree well with the numerical results. The oyster shell samples are impacted by the CO₂ pulse laser, and their 2-D dynamic responses are measured by the two-point VISAR system. As the sample density increases, the velocity amplitudes decrease, and the amplitudes of the two signals become closer. The nacre-rich samples with higher density show obvious orthotropic properties, which is more suitable for the 2-D orthotropic fractional model, while the 2-D isotropic fractional model is more suitable for the chalk-rich samples with lower density. The 2-D orthotropic fractional model shows greater flexibility in fitting dynamic responses. The statistical relations of the fractional orders with the fractal dimension of the oyster shell samples are obtained by the FEM and by the fractional models. The fractional orders evaluated by the 2-D fractional model are much better than those evaluated by the 1-D fractional model. It provides a new approach to understanding the dynamic responses of 2-D discontinuous medium.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110448"},"PeriodicalIF":7.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254664","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":"Mechanical model for two-dimensional ultrasonic-assisted grinding of unidirectional Cf/SiC composites","authors":"Zhenyan Duan ,&nbsp;Tao Chen ,&nbsp;Yuhao Suo ,&nbsp;Haohui Shi ,&nbsp;Junpeng Ye","doi":"10.1016/j.ijmecsci.2025.110419","DOIUrl":"10.1016/j.ijmecsci.2025.110419","url":null,"abstract":"<div><div>Two-dimensional ultrasonic-assisted grinding (2D-UAG) is a highly efficient process for brittle materials. Compared to conventional grinding (CG) and one-dimensional ultrasonic-assisted grinding (1D-UAG), the surface quality of workpieces can be further improved. Unidirectional carbon-fiber-reinforced silicon carbide composites (UD-C_f/SiCs) have a wide range of applications in engineering. However, the existing mechanical models developed for the machining of C_f/SiCs have various limitations, especially the inability to reflect the transient force information. In this work, a dynamic force prediction model is developed for the 2D-UAG of the C_f/SiCs. In the modelling process, the micro-morphology of the grinding wheel was first characterized. Secondly, the cutting force of a single grit was obtained based on the fiber fracture theory and the energy conservation law. Finally, considering the grain movement in the 2D-UAG, a novel force decomposition and synthesis algorithm was used to calculate the total force. The validation results showed that the maximum predicted error of the model for the resultant force <em>F_s</em> is 14.86 % and the average value is 7.36 %. The predicted boundary values and mean values of the fractional forces <em>F</em>_n and <em>F</em>_t are also in good agreement with the experimental values. In addition, the fibers have a large influence on the fluctuation of the force value due to the suppression of transverse crack extension. The order of influence is Perpendicular &gt; Transverse &gt; Longitudinal.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"299 ","pages":"Article 110419"},"PeriodicalIF":7.1,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185721","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":"Lateral deformation behavior of internally fin-stiffened tubes","authors":"Mustafa Said Okutan ,&nbsp;Muhammet Muaz Yalçın ,&nbsp;Mostafa S.A. ElSayed ,&nbsp;Kenan Genel","doi":"10.1016/j.ijmecsci.2025.110446","DOIUrl":"10.1016/j.ijmecsci.2025.110446","url":null,"abstract":"<div><div>Thin-walled tubular structures are frequently used in energy absorption applications; however, the performance of increasing their lateral compression remains a significant challenge. This study addresses the necessity to enhance the tubular structures' lateral energy absorption capacity. To this end, the study proposes an integration of an internal stiffener with simple geometry, allowing for the deformation to be controlled parametrically. Using carbon fiber reinforced nylon (CFRN) tubes manufactured via 3D printing, the influence of internal fins with varying angles and positions on mechanical behavior under quasi-static lateral loading is systematically investigated. Experimental results demonstrate that the optimal stiffened configuration achieves up to 3.2 times higher absorbed energy and 2.5 times greater specific energy absorption (SEA) compared to baseline hollow tubes. Finite element simulations validated the experimental observations and provided insights into deformation mechanisms. The proposed design offers a versatile and scalable solution by providing tunable performance through geometric changes such as fin orientation, position, and wall thickness. This design is regarded as a source of inspiration for subsequent studies. Given that the structure's suitability for the extrusion technique allows the use of metal materials, it is expected to create potential for various and demanding applications in the aerospace, automotive, and defense industries.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110446"},"PeriodicalIF":7.1,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222094","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":"Atomic-scale protuberance induced by AFM dynamic lithography","authors":"Yang He,&nbsp;Fengzhou Fang","doi":"10.1016/j.ijmecsci.2025.110451","DOIUrl":"10.1016/j.ijmecsci.2025.110451","url":null,"abstract":"<div><div>This study aims to explore the resolution limits of mechanical machining at the atomic scale through mechanical scanning probe lithography (m-SPL) using an atomic force microscope (AFM) tip. As a robust technique, m-SPL bridges the gap between fundamental research and industrial application, for the emerging demands of atomic and close-to-atomic scale manufacturing (ACSM). Dynamic lithography, utilizing the dynamic response of the cantilever, enabled cyclic contact between the tip and surface at high frequency. The shallow groove was formed through material extrusion under significant elastic recovery and the accumulation of the pile-up. The interaction of proximity pile-ups facilitated the formation of stable protuberances with precisely defined heights. Additionally, atomic-scale heights of protuberance steps were generated through controlled energy dissipations during surface modification. These findings highlight dynamic lithography as a reliable method for investigating mechanical properties and manufacturing mechanisms under high strain rates, thereby contributing to atomic-scale manufacturing technologies.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110451"},"PeriodicalIF":7.1,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222096","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":"Fault diagnosis based on deep transfer learning for marine turbocharger","authors":"Lei Hu ,&nbsp;Luyuan Liu ,&nbsp;Jianguo Yang ,&nbsp;Haoran Hu ,&nbsp;Can Zheng ,&nbsp;Yonghua Yu","doi":"10.1016/j.ijmecsci.2025.110444","DOIUrl":"10.1016/j.ijmecsci.2025.110444","url":null,"abstract":"<div><div>The high cost, the inherent risk associated with fault simulation testing, and the complexity of diagnosing variable-speed operational dynamics present significant challenges for marine turbochargers. To address these issues, a fault diagnosis methodology that integrates finite element simulation with deep transfer learning algorithms is proposed for marine turbocharger in the paper. A vibration response model of the turbocharger system is established using the numerical simulation method. The accuracy of the numerical simulated model is validated through comparison with experimental data. Rotor imbalance and bearing wear faults are simulated, and variations in vibration response under different rotational speeds and fault severities are systematically analyzed. Subsequently, a fault diagnosis model based on deep transfer learning is developed to identify rotor imbalance and bearing wear faults. Feature transfer across network layers between source and target domains is achieved using the multi-kernel maximum mean discrepancy criterion. The results demonstrate that the numerical vibration response model achieves high accuracy, with a relative error of less than 5 % compared to the experimental data. Furthermore, the proposed deep transfer learning model effectively classifies rotor imbalance and bearing wear under variable operating conditions, achieving a classification accuracy of 99.76 %.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110444"},"PeriodicalIF":7.1,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222095","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":"Extended friction energy model for milled surface wear prediction","authors":"Ke Li ,&nbsp;Yifeng Luo ,&nbsp;Zijia Wei ,&nbsp;Yao Hou ,&nbsp;Bowen Chen ,&nbsp;Jing Ni ,&nbsp;Zhenbing Cai","doi":"10.1016/j.ijmecsci.2025.110441","DOIUrl":"10.1016/j.ijmecsci.2025.110441","url":null,"abstract":"<div><div>Milling, as a core process for manufacturing key components of aero-engines, forms a gradient metamorphic layer (residual stress and work hardening) on the workpiece surface, which significantly affects its fretting wear behavior. However, most existing research focuses on point contact conditions, and studies on wear under face-to-face contact conditions are still seriously lacking. In addition, constructing a prediction model for such a complex surface faces a double challenge: traditional machine learning methods are limited by small sample data and insufficient physical interpretability; finite element simulation requires repeated experimental calibration of tribological parameters. Therefore, this study, through systematic experiments, for the first time revealed the four-dimensional nonlinear coupling wear mechanism (normal pressure, displacement amplitude, cycles, frequency) of the milled surface under face-to-face contact conditions. Based on this, an extended weighted friction energy model was innovatively proposed. By introducing a bias term, it breaks through the limitations of the traditional model's assumption of homogeneous materials and significantly enhances its adaptability to complex working conditions. Further combined with ALE technology, a fretting wear simulation model that does not require parameter calibration was developed. Experimental verification shows that only 12 training samples are needed to achieve high-precision prediction of the wear rate of the milled surface, reducing the error by 27.6% compared with the traditional model; the wear depth prediction error of the developed simulation model is 7.98% under low cycle numbers. This method, by integrating the advantages of physics-driven and data-driven approaches, provides new theoretical support for the prediction of complex surface wear.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110441"},"PeriodicalIF":7.1,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144230572","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":"A self-adjusting directional nonlinear energy sink","authors":"Xiaofeng Geng ,&nbsp;Shican Liu ,&nbsp;Kexiang Wei ,&nbsp;Li Zhang ,&nbsp;Bang Jiang ,&nbsp;Xingjian Jing ,&nbsp;Hu Ding","doi":"10.1016/j.ijmecsci.2025.110439","DOIUrl":"10.1016/j.ijmecsci.2025.110439","url":null,"abstract":"<div><div>Previous investigations on nonlinear energy sink (NES) have mainly concentrated on vibration energy absorption in given directions. It is a challenge to suppress direction-changing vibrations. To address this issue, an innovative self-adjusting directional nonlinear energy sink (SAD-NES) is designed to suppress unpredictable-direction vibrations. The mentioned NES can be passively tuned to the maximum vibration direction through its own inertia without additional assistance. To achieve this goal, the SAD-NES model is first designed. Then, the dynamic equations of the SAD-NES are derived according to the designed model. The effect of the SAD-NES on suppressing unpredictable-direction vibrations in the plane is theoretically predicted. The dynamic features influenced by parameters are revealed in the free and forced vibrations. Finally, an experimental platform of the SAD-NES has been established to validate theoretical predictions. The results illustrate that classic NES can significantly suppress vibrations for a given direction. For unpredictable-direction vibrations, the classical NES damping efficiency will decrease as the external excitation angle increases. This deficiency can be greatly improved by the mentioned NES. In free and forced vibrations, vibration in different directions is significantly suppressed by the mentioned NES. The vibration reduction effect of the SAD-NES can be improved by proper rotational damping. In a word, this paper provides a new design approach for NES and a highly feasible control strategy for unpredictable-direction vibrations in engineering practice. Moreover, the mentioned NES can enrich nonlinear dynamics theory.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110439"},"PeriodicalIF":7.1,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212953","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":"Design of quasi-zero-stiffness metamaterials with ultra-wideband vibration isolation performance","authors":"Lingbo Li ,&nbsp;Fan Yang ,&nbsp;Sanfeng Liu ,&nbsp;Zhengmiao Guo ,&nbsp;Dong Han ,&nbsp;Yi Xia ,&nbsp;Lihua Wang ,&nbsp;Hualin Fan","doi":"10.1016/j.ijmecsci.2025.110440","DOIUrl":"10.1016/j.ijmecsci.2025.110440","url":null,"abstract":"<div><div>Traditional single-function lightweight structure excels in a specific application scenario such as energy absorption, but is difficult to meet the multi-function requirements of the complex working environment for the high-end equipments. In this paper, a novel quasi-zero stiffness (QZS) metamaterial is proposed based on the topological design combining the positive and negative stiffness units, to achieve the multifunction integration of vibration attenuation and energy absorption. The quasi-static compression tests and shaker vibration isolation tests were carried out on the specimens prepared by stereolithography (SLA) and selective laser sintering (SLS) additive manufacturing techniques. The effects of structural parameters and base materials on the mechanical and vibration isolation properties of QZS metamaterials were systematically investigated. The proposed QZS metamaterial can realize the ultra-wideband vibration damping effect with the isolation band as wide as 5980 Hz, and the overall deformation of the structure can be adjusted by both mechanical load and temperature programming. In addition, the proposed QZS metamaterials have excellent repeatable energy absorption properties, maintaining 80 % load carrying capacity and 92 % specific energy absorption (SEA) after six loading cycles. Therefore, the QZS metamaterial can simultaneously achieve high load-bearing capacity and excellent vibration isolation performance, providing a new pathway to build multifunctional integrated lightweight structures.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110440"},"PeriodicalIF":7.1,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184792","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":"Mechanical anisotropy match of parameterized body-centered-cuboid scaffolds and trabecular bones","authors":"Heming Chen ,&nbsp;Xiangyang Xu ,&nbsp;Nicola M. Pugno ,&nbsp;Zhiyong Li ,&nbsp;Qiang Chen","doi":"10.1016/j.ijmecsci.2025.110423","DOIUrl":"10.1016/j.ijmecsci.2025.110423","url":null,"abstract":"<div><div>The gold standard scaffold requires a perfect mechanical match between the scaffold and bones to create a suitable local mechanical microenvironment for bone repair; otherwise, the bone repair probably fails due to postoperative complications. Differently from the extensive biological evaluations of various scaffolds in the field of bone tissue engineering, this study first investigated the mechanical anisotropy match of a parameterized body-centered-cuboid (pBCC) scaffold to the trabecular bone. By varying two independent angle variables (<em>θ</em> and <em>φ</em>) of the scaffold, the mechanical anisotropy of the scaffold was fully characterized by the theory, experiment and finite element method, and its deformation patterns and failure features related to the two variables were clarified. In particular, the elastic modulus anisotropy ratios of the scaffold and the femoral-head trabecular bone were calculated to examine their match. The results demonstrated that the normalized elastic moduli and yield strengths of the scaffolds could be reliably predicted by the theory which was validated by the experiments and finite element analysis. Moreover, the deformation patterns and failure features of the scaffold were strongly influenced by the two angle variables which actually determined the scaffold height. Importantly, the scaffold could be designed to achieve a high anisotropy ratio to allow various elastic modulus anisotropy ratio match with trabecular bones from the femoral head, proximal tibia, lumbar spine, and mandibular condyle. In addition, the developed theory could be generalized to design suitable scaffolds made of common biomaterials for bone repair for other anatomical sites by the modulus-strength chart. This study novelly presented that the mechanical anisotropy match between the scaffold and the trabecular bone could be achieved through a flexible parameterization design of the scaffold <em>via</em> the current methodology, which might offer promising applications in the fields of the bone tissue engineering and the regenerative medicine.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"300 ","pages":"Article 110423"},"PeriodicalIF":7.1,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291307","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}