International Journal of Mechanical Sciences最新文献_第9页

Thermo-elasto-hydrodynamic analysis of gas foil bearings

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-02-01 DOI: 10.1016/j.ijmecsci.2025.109940

Xuewei Zhao , Changlin Li , Jianjun Du , Jie Li , Yong Lu

{"title":"Thermo-elasto-hydrodynamic analysis of gas foil bearings","authors":"Xuewei Zhao , Changlin Li , Jianjun Du , Jie Li , Yong Lu","doi":"10.1016/j.ijmecsci.2025.109940","DOIUrl":"10.1016/j.ijmecsci.2025.109940","url":null,"abstract":"<div><div>This paper proposes a comprehensive model for thermo-elasto-hydrodynamic analysis of gas foil bearings. In contrast to many works that simplify the foil structure to a two-dimensional model, the top foil and bump foil are modeled using the shell elements to consider the three-dimensional configuration and axial variation in deflection. To more accurately predict the heat transferred from the gas film to the bump foil, the subambient pressure is allowed and a contact model is developed to consider the nonlinear contact/separation behavior of foil structure. Emphasis is put on the thermal submodels of the gas film, rotor, foil structure and bearing sleeve, where the energy equation and heat equations are numerically solved using the finite element method. The global temperatures of the bearing system are simultaneously obtained using a fully coupled method, enabling a computationally efficient and robust solution. The results reveal that the temperature distribution of gas film exhibits fluctuations due to the contacts between the top and bump foils, but the subambient pressure also causes separations between the foils near the trailing region. Additionally, parametric studies are conducted to explore the effects of the rotational speed and nominal clearance on the thermal performance of foil bearings.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109940"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167444","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}

引用次数: 0

Analytical thermal modeling for conventional and in-situ laser assisted turning

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-02-01 DOI: 10.1016/j.ijmecsci.2025.109919

Yuhan Li , Yintian Xing , Linhe Sun , Denghui Li , Tengfei Yin , Jianpeng Wang , Wai Sze Yip , Suet To

{"title":"Analytical thermal modeling for conventional and in-situ laser assisted turning","authors":"Yuhan Li , Yintian Xing , Linhe Sun , Denghui Li , Tengfei Yin , Jianpeng Wang , Wai Sze Yip , Suet To","doi":"10.1016/j.ijmecsci.2025.109919","DOIUrl":"10.1016/j.ijmecsci.2025.109919","url":null,"abstract":"<div><div>Cutting heat dynamics play a pivotal role in machining quality and efficiency, making the accurate prediction of cutting temperatures and their distributions essential. This study presents an advanced analytical thermal model designed to predict temperature distribution across the chip, tool, and workpiece during single-point diamond turning and in-situ laser-assisted turning. A novel approach combining an analytical force model with an optimization algorithm is introduced to precisely calculate heat source intensity. The model incorporates the heat intensity distribution along the chip-tool interface, considering the effects of the sticking and sliding zones. Additionally, a new method for calculating the temperature distribution on the tool, caused by a crescent-shaped stationary heat source, is proposed. To enhance accuracy, the model accounts for temperature-dependent thermal conductivity and diffusivity of the workpiece material through iterative refinement. A high-order polynomial fitting is employed to streamline the determination of heat partition ratios, ensuring consistency in temperature predictions for both moving and stationary heat sources. The proposed models are validated through comparisons with infrared imaging and finite element method simulations, providing a robust theoretical framework for predicting temperature behavior in ultra-precision and precision turning processes.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109919"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167445","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}

引用次数: 0

Manipulating defects in metallic glasses via ultrasonic treatment

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-02-01 DOI: 10.1016/j.ijmecsci.2025.109960

W. Li , C. Wang , L.Y. Li , C. Zhang , J. Ma , X.K. Xi , K. Tao , J.C. Qiao , C.C. Yuan , W.H. Wang

{"title":"Manipulating defects in metallic glasses via ultrasonic treatment","authors":"W. Li , C. Wang , L.Y. Li , C. Zhang , J. Ma , X.K. Xi , K. Tao , J.C. Qiao , C.C. Yuan , W.H. Wang","doi":"10.1016/j.ijmecsci.2025.109960","DOIUrl":"10.1016/j.ijmecsci.2025.109960","url":null,"abstract":"<div><div>Flow defects play an important role in shaping the mechanical behaviors of metallic glasses (MGs), especially their plastic deformation. Characterizing or manipulating these defects in MGs is of a great challenge due to the absence of the long-range order. In this work, we systematically investigated the defect activation mechanism of the La<sub>55</sub>Al<sub>25</sub>Ni<sub>5</sub>Cu<sub>10</sub>Co<sub>5</sub> medium-entropy MG under ultrasonic treatment (UT) from perspectives of order and electronic structure. The finding reveals that the ordered configurations inherited from the liquid state intend to unravel after UT, meanwhile the atomic packing rejuvenates to a more disordered loose state even though the structural ordering interrupts at high injected energies, which ultimately contributes to the strong defect relaxation with longer characteristic times as evidenced by a generalized Maxwell-Voigt model. The <sup>27</sup>Al nuclear magnetic resonance (NMR) confirms the redistribution of local clusters around Al sites during UT, along with the bonding characteristics evolving from a covalent-like to predominantly metallic state, and then towards covalent-like nature again accompanied with ordering. Simultaneously activated defects enhance the mechanical heterogeneity with the remarkable decrease of hardness and elastic modulus, thereby more significant plastic flow under multiscale defect activation. Our work provides new perspectives for dexterously modulating the plastic deformability of MGs and potentially sheds new light on the deformation mechanism of amorphous materials.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109960"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167536","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}

引用次数: 0

Novel multiscale modeling strategy for hybrid fiber reinforced composites

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-02-01 DOI: 10.1016/j.ijmecsci.2025.109997

Guohua Zhu, Yujia Zhang, Xinxiang Niu, Chaoshuai Duan, Zhen Wang, Xuan Zhao

{"title":"Novel multiscale modeling strategy for hybrid fiber reinforced composites","authors":"Guohua Zhu, Yujia Zhang, Xinxiang Niu, Chaoshuai Duan, Zhen Wang, Xuan Zhao","doi":"10.1016/j.ijmecsci.2025.109997","DOIUrl":"10.1016/j.ijmecsci.2025.109997","url":null,"abstract":"<div><div>Hybrid fiber-reinforced plastic (HFRP) composites exhibit tremendous merits in terms of a balanced design between cost and performance. Despite their advantages, there is still a lack of efficient design methods to cope with energy-absorbing design problems, which has hindered their large-scale application. This study aims to develop a novel multiscale modeling strategy for HFRP composites and achieve a micro–meso–macro matched structural design. Specifically, a series of bending tests were performed on several carbon-fiber/glass-fiber hybrid composite plates and hat-shaped beams to explore the effects of the hybrid scheme, hybrid ratio, and stacking sequence on their mechanical performance. Subsequently, a novel multiscale model based on the micromechanics of failure criterion with new damage evolution laws was developed to perform a multiscale collaborative design for intralayer hybrid composite beams. A comparative analysis was performed to explore the influence of the multiscale design variables on the mechanical performance. The results indicated that intralayer hybrid composite plates and beams with a stacking sequence of [C0/G90]<sub>8</sub> had significant advantages in flexural modulus, flexural strength, and energy absorption compared with their single fiber composite counterparts. It was also found that the higher the proportion of carbon fiber yarns in the horizontal direction and glass fiber yarns in the vertical direction, the greater was the energy absorption of the intralayer hybrid composite beams. The proposed multiscale modeling strategy was not only an effective supplement to traditional multiscale modeling methods, but also made it possible to perform multiscale collaborative optimization of HFRP composites.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109997"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168019","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}

引用次数: 0

Quasi-static mechanical behaviors of arc curved crease origami metamaterials 弧形折痕折纸超材料的准静态力学行为

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-02-01 DOI: 10.1016/j.ijmecsci.2025.109939

Jianzhang Huang, Jing Lin, Liwei Huang, Yijie Liu, Xinmei Xiang, Yingjing Liang

{"title":"Quasi-static mechanical behaviors of arc curved crease origami metamaterials","authors":"Jianzhang Huang, Jing Lin, Liwei Huang, Yijie Liu, Xinmei Xiang, Yingjing Liang","doi":"10.1016/j.ijmecsci.2025.109939","DOIUrl":"10.1016/j.ijmecsci.2025.109939","url":null,"abstract":"<div><div>This paper introduces a novel arc curved crease origami (ACCO) metamaterial based on Miura origami, that shows improved specific energy absorption, indicating a major advancement over traditional Miura origami. The quasi-static mechanical properties and energy absorption characteristics of the ACCO metamaterials were studied through experiments and finite element analysis. Results reveal that the ACCO metamaterials’ tailored inter-shell angles ensure consistent enhanced performance and energy absorption across all compression directions, offering lightweight and durable structures with versatile anisotropic properties. The bi-directional graded design of ACCO metamaterials, featuring adjustable shell angles, central angles, and cell thicknesses, has resulted in a new class of lightweight, high-energy-absorptive metamaterials. Our research confirms that advanced ACCO metamaterials optimize energy absorption efficiency and possess an enhanced energy dissipation system, outperforming traditional origami metamaterials. These findings suggest that ACCO metamaterials are promising for energy absorption applications and provide valuable design principles for origami-based energy absorption devices.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"287 ","pages":"Article 109939"},"PeriodicalIF":7.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142975249","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}

引用次数: 0

Thermal surface deflection of a medium with multilayer coatings

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-02-01 DOI: 10.1016/j.ijmecsci.2025.109984

Dariusz M. Perkowski , Roman Kulchytsky-Zhyhailo , Stanisław J. Matysiak , Yuriy V. Tokovyy

引用次数: 0

Wear mechanisms of straight blade tool by dual-periodic impact platform

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-01-31 DOI: 10.1016/j.ijmecsci.2025.110031

Yiying Liang , Pingfa Feng , Zhiyong Song , Shaowei Zhu , Tao Wang , Jie Xu , Qizhong Yue , Enlai Jiang , Yuan Ma , Ge Song , Xinman Yuan , Feng Feng

{"title":"Wear mechanisms of straight blade tool by dual-periodic impact platform","authors":"Yiying Liang , Pingfa Feng , Zhiyong Song , Shaowei Zhu , Tao Wang , Jie Xu , Qizhong Yue , Enlai Jiang , Yuan Ma , Ge Song , Xinman Yuan , Feng Feng","doi":"10.1016/j.ijmecsci.2025.110031","DOIUrl":"10.1016/j.ijmecsci.2025.110031","url":null,"abstract":"<div><div>The machining of Nomex honeycomb composites (NHCs) poses significant challenges due to their irregular internal fibers, brittleness, hardness, and honeycomb structure, which accelerate tool wear and fracture. Although considerable research has investigated tool wear mechanisms in composite machining, the effects of combining high-frequency ultrasonic vibrations with low-frequency impacts on straight blade tools remain insufficiently understood. This study addresses these gaps by introducing an innovative theoretical and experimental approach to examine the combined effects of high-frequency and low-frequency impacts on tool wear, as well as the independent effects of low-frequency impacts. Here, we developed a dual-periodic impact wear test platform, designed to replicate real cutting conditions by incorporating both ultrasonic vibration and the inherent characteristics of the honeycomb structure. The experimental results reveal that ultrasonic vibrations induce edge rounding on the straight blade through multi-point impacts. This process progressively smooths the cutting edge, thereby delaying wear progression. Furthermore, the wear pattern under ultrasonic vibration is characterized by a rounded edge, in contrast to the chamfered edge wear pattern observed without ultrasonic vibration. Moreover, ultrasonic vibration reduces stress concentration, slowing the formation and propagation of micro-damage in the straight blade. This study simplifies tool wear tests for machining NHCs using the dual-periodic impact wear test platform and highlights the tool wear mechanisms under complex multi-frequency impact environments.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"288 ","pages":"Article 110031"},"PeriodicalIF":7.1,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172678","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}

引用次数: 0

Brittleness indices for chemically corroded rocks under unloading confining pressure

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-01-31 DOI: 10.1016/j.ijmecsci.2025.110032

Hao Li , Leo Pel , Zhenjiang You , David Smeulders

{"title":"Brittleness indices for chemically corroded rocks under unloading confining pressure","authors":"Hao Li , Leo Pel , Zhenjiang You , David Smeulders","doi":"10.1016/j.ijmecsci.2025.110032","DOIUrl":"10.1016/j.ijmecsci.2025.110032","url":null,"abstract":"<div><div>Rock brittleness constitutes a pivotal mechanical property for geotechnical engineering. In this paper, multi-scale investigations, involving Nuclear Magnetic Resonance (NMR), X-ray Diffraction (XRD), ion chromatography, Scanning Electron Microscope (SEM), as well as unloading tests, were conducted to examine the brittle behaviors and mechanisms of rocks under chemical-unloading confinement conditions. This paper defines rock brittleness as the capacity to withstand multiscale fracturing based on experimental investigations into multiscale damage mechanisms and macro-mechanical responses. After that, two novel brittleness indices are proposed, utilizing the dissipated energy consumption and energy-drop coefficients proposed in this study. These indices are then validated using experimental data. Following this, the coupled chemical-unloading confinement effects on rock brittleness are investigated. Results reveal that an increase in the unloading confinement rate from 0 to 0.1 MPa/s can lead to a 45.46 % increase in brittleness; chemical-induced porosity growth from 5.68 % to 7.55 % can cause a 66.43 % increase in brittleness, with the influence being amplified by the effects of unloading confinement. Moreover, the presence of kaolinite resulting from the incongruent dissolution of feldspar significantly impacts rock brittleness, leading to a decrease of 43.58 % in brittleness value. This study defines rock brittleness precisely and introduces a new evaluation method, highlighting the significant effects of unloading rate and chemical corrosion. These findings are crucial for advancing underground engineering practices.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"288 ","pages":"Article 110032"},"PeriodicalIF":7.1,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Resilient multi-layered lattices with alternating chirality for self-recovering energy absorption

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-01-31 DOI: 10.1016/j.ijmecsci.2025.110023

Andrea Bacigalupo, Vito Diana, Luigi Gambarotta

{"title":"Resilient multi-layered lattices with alternating chirality for self-recovering energy absorption","authors":"Andrea Bacigalupo, Vito Diana, Luigi Gambarotta","doi":"10.1016/j.ijmecsci.2025.110023","DOIUrl":"10.1016/j.ijmecsci.2025.110023","url":null,"abstract":"<div><div>This research focuses on the development of a high-performance metamaterial that combines dissipation and resilience, a subject of growing actual interest in vibration and impact mechanics as part of the quest for avant-garde self-recovering materials. In this context, a high-performance resilient layered metamaterial with alternating chiral topology is conceived and analyzed. Specifically, the single layer is realized via the periodic assembly of rigid disks connected by elastic ligaments and stacked using passing pins. The metadevice is formed by stacking layers with alternating chirality. This configuration induces relative rotations between the aligned discs in contact when in-plane forces are applied. Frictional dilating interfaces between adjacent disks produce a dissipative and resilient mechanical response, returning to the initial configuration at the end of the unloading phase. Specifically, the dissipative mechanism is designed to significantly attenuate vibratory motions and/or absorb energy during impact processes, while being reusable after the dynamic actions have acted on the metamaterial. This cutting-edge metamaterial offers several advantages over current technologies: i) hysteretic response with maximum dissipation of mechanical energy and high stiffness; ii) reuse of the device without external interventions, restoring the initial configuration at the end of the dynamic process; iii) multi-directional dissipative response; and iv) bilateral response, providing equal performance under both traction and compression.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"288 ","pages":"Article 110023"},"PeriodicalIF":7.1,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fiber bond-slip theoretical model for magnesium phosphate cementitious composites

IF 7.1 1区工程技术

International Journal of Mechanical Sciences Pub Date : 2025-01-31 DOI: 10.1016/j.ijmecsci.2025.110030

Fei Liu , Chengcheng Fan , Zengtao Chen , Baomin Wang , Changjun Zhou

{"title":"Fiber bond-slip theoretical model for magnesium phosphate cementitious composites","authors":"Fei Liu , Chengcheng Fan , Zengtao Chen , Baomin Wang , Changjun Zhou","doi":"10.1016/j.ijmecsci.2025.110030","DOIUrl":"10.1016/j.ijmecsci.2025.110030","url":null,"abstract":"<div><div>This study investigates basalt fiber interface degradation and developed the theoretical model incorporating fiber pull-out behavior of polymer-modified magnesium phosphate cement (PMPC) matrix. Fiber bundle pull-out tests were conducted first, followed by the establishment and validation of an interface constitutive model that accounted for bond-slip cracking between the fiber and matrix. Additionally, the compression behavior of basalt fiber-reinforced PMPC (BFPMPC) mortar was analyzed with fiber interface fracture considered. The results indicated that the strong adhesion of the PMPC paste resulted in high equivalent and average shear adhesion strength at the fiber interface. As the pull-out loading rate increased, the pull-out force rose correspondingly. However, the maximum pull-out force decreased with increase of inclination angles. The elastic modulus of interface between the fiber and PMPC matrix was determined to be 63.82 GPa. Experimental observations of fiber compressing the PMPC matrix revealed mode I crack characteristics. Compared with numerical simulation results, the test results aligned well with the experimental curves. This agreement validated the proposed fracture mechanics model for fiber-PMPC matrix bond-slip failure. Furthermore, the compression constitutive law of BFPMPC mortar strongly agreed with experimental findings, which considered bond-slip interactions and interface damage evolution.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"288 ","pages":"Article 110030"},"PeriodicalIF":7.1,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172339","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}

引用次数: 0