检索结果-内蒙古大学图书馆

Influence of surface layer and screw angle on tribological wear of sliding pedicle screws used in a growth guidance system

引用

Archives of Civil and mechanical engineering 2025年第3期25卷 1-23页

作者： Szkoda-Poliszuk, Klaudia Dobrowolska-Brończyk, Anna Żak, Malgorzata Pezowicz, Celina Department of Mechanics Materials and Biomedical Engineering Faculty of Mechanical Engineering Wroclaw University of Science and Technology ul. Lukasiewicza 7/9 Wroclaw50-371 Poland Department of Fundamentals of Machine Design and Mechatronic Systems Faculty of Mechanical Engineering Wroclaw University of Science and Technology ul. Lukasiewicza 5 Wroclaw50-371 Poland

The aim of the study was to assess the influence of the type of surface layer (passive vs. diamond-like carbon coated) and the angle of pedicle screw implantation on abrasive wear of sliding screw caps used in spinal growth guidance systems. The scope of the experiment included the performance of high-cycle mechanical tests using reciprocating motion, imitating friction processes that occur during the use of implants. Measurements and identification were also carried out of the type of wear generated by friction (tests of surface topography and changes in chemical composition). Examination of friction surfaces revealed all mechanisms of abrasive wear, i.e., microcutting, scratching, and furrowing. In the case of traditional locking caps, furrowing and scratching were most frequently observed, while for caps coated with diamond-like carbon (DLC), the dominant mechanism was scratching. For most of the friction nodes tested, those with a passive coating showed significantly greater wear than friction nodes with a DLC layer, regardless of the screw implantation angle. On one hand, the use of DLC coatings improves durability owing to increased resistance of the coated surfaces to abrasive wear, but on the other hand, it carries the risk of emergency wear when the DLC coating wears out. © The Author(s) 2025.

关键词： Tribology

来源：评论

学校读者我要写书评

暂无评论

Unlocking of Schottky Barrier Near the Junction of MoS2 Heterostructure Under Electrochemical Potential

引用

Energy & Environmental materials 2025年第1期8卷 327-333页

作者： Kubra Aydin Mansu Kim Hyunho Seok Chulwoo Bae Jinhyoung Lee Muyoung Kim Jonghwan Park Joseph T.Hupp Dongmok Whang Hyeong-U Kim Taesung Kim SKKU Advanced Institute of Nanotechnology (SAINT) Sungkyunkwan University Department of Nano Science and Technology Sungkyunkwan University Department of Chemistry Northwestern University School of Advanced Material Science and Engineering Sungkyunkwan University School of Mechanical Engineering Sungkyunkwan University Center for Quantum Nanoscience Institute for Basic Science (IBS) Semiconductor Manufacturing Research Center Korea Institute of Machinery and Materials (KIMM) Nano-Mechatronics University of Science & Technology (UST) Department of Nano Engineering Sungkyunkwan University

The exploration of heterostructures composed of two-dimensional(2D)transition metal dichalcogenide(TMDc) materials has garnered significant research attention due to the distinctive properties of each individual compo... 详细信息

关键词： hydrogen evolution reaction (HER) molybdenum disulfide (MoS2) plasma-enhanced chemical vapor deposition (PECVD) Schottky barrier van der Waals (vdW) heterostructure

来源：评论

学校读者我要写书评

暂无评论

Examining whether normal stress affects deformation twinning

引用

材料科学技术（英文版） 2025年第5期208卷 307-312页

作者： R.H.Li Z.J.Zhang J.X.Yan J.B.Yang Z.Qu R.Liu X.T.Li X.G.Wang Y.N.Zhang A.G.Sheinerman Z.F.Zhang T.G.Langdon Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Mechanical Engineering Liaoning Petrochemical UniversityFushun 113001China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Institute of Problems of Mechanical Engineering Russian Academy of SciencesSt.Petersburg 199178Russia Department of Mechanical Engineering University of SouthamptonSouthampton SO17 1BJUnited Kingdom

***Twinning is a fundamental mechanism for plastic deforma-tion in many face-centered cubic(FCC)metals having low stack-ing fault energies(SFEs)[1,2].

*** Twinning is a fundamental mechanism for plastic deforma-tion in many face-centered cubic(FCC)metals having low stack-ing fault energies(SFEs)[1,2].

关键词： whether stress normal affects deformation examining twinning

来源：评论

学校读者我要写书评

暂无评论

Design Study Evaluating Impact of Gap Loss on Nanocrystalline Inductor Cores with Experimental Validation 14

Design Study Evaluating Impact of Gap Loss on Nanocrystallin...

引用

14th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2025

作者： Sturdivant, Maurice Grainger, Brandon Bracken, Christopher Ohodnicki, Paul University of Pittsburgh Department of Electrical and Computer Engineering United States University of Pittsburgh Department of Mechanical Engineering and Materials Science United States

ISBN: (纸本)9798331516116

As electric vehicle (EV) technology matures, the need for compact and efficient power electronics will continue to grow. To increase power density and efficiency, it is ideal to minimize the size and power loss of components, including inductors. A standard inductor design technique is placing an air gap in the magnetic core, allowing designers to tune the inductance and allow higher levels of magnetic field without saturation. The inclusion of gaps can increase the total magnetic core loss beyond those predicted by common models such as the Steinmetz equation, creating the need for accurate gap loss models. In this study, the losses of a nanocrystalline inductor core are experimentally measured and compared to an existing gap loss model, showing significant agreement with predicted values. The model was then integrated into a multi-objective optimization framework to evaluate the fitness of nanocrystalline cores against ferrite cores at different switching frequencies. This work finds that gap losses can increase the total loss of nanocrystalline inductors by up to an order of magnitude as frequency increases, implying that consideration of gap losses is vital to selecting the appropriate core material for design applications. © 2025 IEEE.

关键词： Magnetic cores

来源：评论

学校读者我要写书评

暂无评论

Microstructural evolution and its influence on the wear resistance of a laser directed energy deposited Ni-based single crystal superalloy

引用

材料科学技术（英文版） 2025年第2期205卷 127-138页

作者： Chenyu Ren Kai Chen Jingjing Liang R.Lakshmi Narayan Upadrasta Ramamurty Jinguo Li Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano) State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049China Superalloys Division Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Materials Science and Engineering Indian Institute of TechnologyDelhiNew Delhi 110016India School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore

The wear behavior of Ni-based single crystal(NBSC)superalloy SRR99 fabricated by laser-directed energy deposition(LDED)is investigated and compared with that of its cast *** γ'precipitate size in the latter is＞400 nm,that in the former is an order of magnitude *** sliding wear tests reveal that the wear rate and coefficient of friction of the LDED alloy are 75％and 20％lower than that of its cast counterpart,*** transmission electron microscopy investigation of the wear-tested cast alloy indicates that there is orientation change and formation of nanoscale grains only at the top layer of the worn surface,whereas regions below undergo moderate plastic deformation via dislocation *** contrast,the sub-surface of the worn LDED alloy has a graded microstructure,with a composite of NiO/γ-Ni on the top,γ'free nano-grains in the middle,and a highly deformed nanoscale layer at the *** improved wear behavior of the LDED alloy is attributed to its higher dislocation density,finer γ'precipitates,and the formation of this graded ***,a detailed description of mechanisms that lead to the formation of this unique graded microstructure is provided.

关键词： In-situ formed gradient nanostructure Enhanced wear resistance Laser-directed energy deposition additive manufacturing Ni-based single crystal superalloys Plastic deformation

来源：评论

学校读者我要写书评

暂无评论

A critical step toward far-field laboratory diffraction contrast tomography in Laue focusing geometry

引用

Journal of Applied Crystallography 2025年第Pt 2期58卷 447-457页

作者： Zhang, Yubin Lindkvist, Adam Department of Mechanical Engineering Technical University of Denmark Kgs. Lyngby2800 Denmark Department of Industrial and Materials Science Chalmers University of Technology GothenburgSE 41296 Sweden

Recent simulations have demonstrated the promising potential of far-field laboratory diffraction contrast tomography (FF-LabDCT) in the Laue focusing geometry for 3D mapping of grain-averaged deviatoric strain tensors, achieving a strain uncertainty as low as 1 × 10-4 [Lindkvist & Zhang (2022). J. Appl. Cryst.55, 21-32]. The present work takes a critical step towards realizing this tool. It presents the first attempt at implementing FF-LabDCT using a Zeiss Xradia 520 Versa X-ray microscope, including both hardware and software development. A new algorithm, LabDBB, which adapts the previously developed dictionary-based branch and bound (DBB) principles, is implemented for indexing FF-LabDCT data. The performance of LabDBB is evaluated by comparing the indexed grain crystallographic orientations and center of mass positions with those obtained using near-field LabDCT within the same gauge volume of a fully recrystallized iron sample. Finally, the challenges related to fitting the grain-averaged deviatoric strain tensor using the current FF-LabDCT setup are identified. The strain analysis suggests that, once these challenges are addressed, a strain uncertainty as low as 2 × 10-4 could potentially be achieved. This work demonstrates the possibility for developing a tool capable of 3D grain-scale strain analysis with high strain precision in home laboratories. © Zhang & Lindkvist 2025.

关键词： Indexing (materials working)

来源：评论

学校读者我要写书评

暂无评论

Laser shock processing of titanium alloys:A critical review on the microstructure evolution and enhanced engineering performance

引用

材料科学技术（英文版） 2025年第6期209卷 262-291页

作者： Qian Liu Shuangjie Chu Xing Zhang Yuqian Wang Haiyan Zhao Bohao Zhou Hao Wang Genbin Wu Bo Mao School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Baoshan Iron & Steel Cooperation Limited Shanghai 201900China School of Mechanical and Electric Engineering Soochow UniversitySuzhou 215100China Department of Mechanical Engineering University of Nevada-RenoReno 89557USA School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Baowu Special Metallurgy Cooperation Limited Shanghai 201900China Shanghai Engineering Research Center of Laser Intelligent Manufacturing Shanghai Institute of Laser Technology Co.Ltd.Shanghai 200233China Department of Orthopaedic Surgery Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China

Titanium(Ti)and its alloys are frequently utilized as critical components in a variety of engineering ap-plications because of their high specific strength and excellent corrosion *** to conven-tional surface strengthening technologies,laser shock peening(LSP)has increasingly attracted attention from researchers and industries,since it significantly improves the surface strength,biocompatibility,fa-tigue resistance,and anti-corrosion ability of Ti and its *** numerous studies that have been carried out to elucidate the effects of LSP on microstructural evolution and mechanical properties of Ti and its alloys in recent years,a comprehensive review of recent advancements in the field of Ti and its alloys subjected to LSP is still *** this review,the standard LSP and the novel process designs of LSP assisted by thermal,cryogenic,electropulsing and magnetic fields are discussed and *** evolution,with focuses on the dislocation dynamics,deformation twinning,grain refine-ment and surface amorphization,during LSP processing of Ti alloys is ***,the en-hanced engineering performance of the LSP-processed(LSPed)Ti alloys,including surface hardness,wear resistance,fatigue life and corrosion resistance are ***,this review concludes by present-ing an overview of the current challenges encountered in this field and offering insights into anticipated future trends.

关键词： Laser shock peening Titanium alloys Microstructure evolution mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Can MXene act as universal solid lubricant: A prolix review

引用

Journal of Industrial and engineering Chemistry 2025年 148卷 329-344页

作者： Singh, Bipin Kumar Singh, Randeep Ahn, Young-Ho Samanta, Suprakash Centre for Augmented Intelligence and Design Department of Mechanical Engineering Sri Eshwar College of Engineering Coimbatore641202 India Department of Civil Engineering Yeungnam University Gyeongsan38541 Korea Republic of Department of Materials Science and Chemical Engineering Hanyang University Ansan15588 Korea Republic of Thuwal23955-6900 Saudi Arabia

This article covers the potential of MXenes as a versatile solid lubricant. MXenes are recognized for their potential across diverse applications ranging from energy storage to fields like biology and medicine. Recently, MXenes research experienced rapid growth in understanding the tribological characteristics due to the outstanding mechanical properties and chemical reactivities. The commercial applications are restricted due to the limited research on MXene-doped composites. The laid down physics, responsible for the improvement in the physical and functional properties is also important for better understanding. Hence, in this effort, the cutting-edge application of MXenes with other matrices is thoroughly discussed. This review explores the potential of next-generation MXenes, highlighting key factors that enhance their tribological properties and the fundamental mechanisms behind them. Later discussions highlight the application of MXenes with various matrices and their future importance. Lastly, the fundamental physics to improve MXene properties concisely concluded with the potential of future research. © 2025 The Korean Society of Industrial and engineering Chemistry

关键词： Tribology

来源：评论

学校读者我要写书评

暂无评论

Nonlinear Aeroelastic Model Considering RANS Unsteady Aerodynamics with Dynamically Linearized Time-domain Approach

Nonlinear Aeroelastic Model Considering RANS Unsteady Aerody...

引用

AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Serafim, Luisa Piccolo Dowell, Earl H. Duke University Department of Mechanical Engineering and Materials Science DurhamNC27708 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

A nonlinear aeroelastic model for a flexible panel is expanded to consider the effect of the viscous boundary layer using a RANS solver. This study presents the use of a Reduced Order Model (ROM) to compute the generalized aerodynamic force from a CFD simulation and compares the results obtained using the same approach with an inviscid solver and the analytical implementation of Full Potential Flow Aerodynamics. The flutter onset critical condition is obtained based on the Limit Cycle Oscillation amplitudes, for different supersonic Mach numbers. Additionally, the effect of different viscous boundary layer thicknesses is explored. Conclusions are made based on the use and application of this more complete aerodynamic theory, particularly for near transonic Mach numbers. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Time domain analysis

来源：评论

学校读者我要写书评

暂无评论

Wire- and powder-based direct energy deposition of NiTi-CuSn10-SS316L

引用

materials and Manufacturing Processes 2025年第8期40卷 1049-1058页

作者： Otynshiyev, Yeldar Sariyev, Bakytzhan Golman, Boris Nie, Yi Spitas, Christos Department of Chemical and Materials Engineering School of Engineering and Digital Sciences Nazarbayev University Astana Kazakhstan Department of Computational and Data Sciences Astana IT University Astana Kazakhstan Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute University of Nottingham Ningbo China Ningbo China Department of Mechanical Materials and Manufacturing Engineering Faculty of Science and Engineering University of Nottingham Ningbo China

Additive manufacturing (AM) is a rapidly advancing method with the ability to produce complex geometries layer by layer. AM shows great promise for joining dissimilar metals. However, direct energy deposition (DED) of nitinol (NiTi) and 316 stainless steel (SS316L) encounters significant difficulties due to the development of brittle Fe-Ti intermetallic compounds. A copper alloy (CuSn10) interlayer was introduced to prevent their formation. This study utilizes a wire- and powder-based DED approach, eliminating the need for feedstock switching. Fine CuSn10 powder was specifically applied for the interlayer, resulting in distinct bonding mechanisms at the interfaces. Interdiffusion resulted in fishbone microstructures at the CuSn10-SS316L interface, whereas the NiTi-CuSn10 interface exhibited dendritic structures with evenly distributed elements. Microhardness analysis revealed a sharp variation across the layers, with the highest value observed at the NiTi-CuSn10 interface (529 HV0.2). This study shows the potential of using wire- and powder-based DED technology to join dissimilar metals. © 2025 Taylor & Francis Group, LLC.

关键词： Copper alloys

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：