Open Access. Powered by Scholars. Published by Universities.®

Tribology Commons

Open Access. Powered by Scholars. Published by Universities.®

612 Full-Text Articles 1,856 Authors 61,710 Downloads 27 Institutions

All Articles in Tribology

Faceted Search

612 full-text articles. Page 1 of 30.

Effect Of Lubricant Type On Deep Drawing Ratio And Drawing Force During Cylindrical Cup Deep Drawing, walid M. shewakh 2022 Industrial Engineering Department, Faculty of Engineering, Jazan University, KSA

Effect Of Lubricant Type On Deep Drawing Ratio And Drawing Force During Cylindrical Cup Deep Drawing, Walid M. Shewakh

Emirates Journal for Engineering Research

Cylindrical cup deep drawing technology is used in various manufacturing processes. For example, it is used in the automotive industry to manufacture auto parts. It is also used in the manufacture of household items. Lubricants are used in metal forming, especially deep drawing, to reduce friction between the tool and the workpiece. As a result, lubrication reduces forming energy and forming steps, increases the drawing ratio and tool life, while preventing galling, seizure and surface damages to the products. In this paper, the main purpose was to increase the deep drawing ratio and reduce the drawing force by angling the …


Tailored Surface Textures To Increase Friction—A Review, Henara L. COSTA, Jörg SCHILLE, Andreas ROSENKRANZ 2022 School of Engineering, Surface Engineering Group, Universidade Federal do Rio Grande, Rio Grande 96203900, Brazil

Tailored Surface Textures To Increase Friction—A Review, Henara L. Costa, Jörg Schille, Andreas Rosenkranz

Friction

Surface textures with micro-scale feature dimensions still hold great potential to enhance the frictional performance of tribological systems. Apart from the ability of surface texturing to reduce friction, surface textures can also be used to intentionally increase friction in various applications that rely on friction for their adequate functioning. Therefore, this review aims at presenting the state-of-the-art regarding textured surfaces for high-friction purposes. After a brief general introduction, the recent trends and future paths in laser surface texturing are summarized. Then, the potential of surface textures to increase friction in different applications including adhesion, movement transmission and control, biomimetic applications, …


Role Of Nanoparticles In Achieving Macroscale Superlubricity Of Graphene/Nano-Sio2 Particle Composites, Panpan LI, Li JI, Hongxuan LI, Lei CHEN, Xiaohong LIU, Huidi ZHOU, Jianmin CHEN 2022 Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Role Of Nanoparticles In Achieving Macroscale Superlubricity Of Graphene/Nano-Sio2 Particle Composites, Panpan Li, Li Ji, Hongxuan Li, Lei Chen, Xiaohong Liu, Huidi Zhou, Jianmin Chen

Friction

Recent studies have reported that adding nanoparticles to graphene enables macroscale superlubricity to be achieved. This study focuses on the role of nanoparticles in achieving superlubricity. First, because graphene nanoscrolls can be formed with nanoparticles as seeds under shear force, the applied load (or shear force) is adjusted to manipulate the formation of graphene nanoscrolls and to reveal the relationship between graphene-nanoscroll formation and superlubricating performance. Second, the load-carrying role of spherical nano-SiO2 particles during the friction process is verified by comparison with an elaborately designed fullerene that possesses a hollow-structured graphene nanoscroll. Results indicate that the incorporated nano-SiO …


Optimization Of Pore Structure And Wet Tribological Properties Of Paper-Based Friction Materials Using Chemical Foaming Technology, Chang LI, Jie FEI, Enzhi ZHOU, Rui LU, Xiaohang CAI, Yewei FU, Hejun LI 2022 State Key Laboratory of Solidification Processing, Shaanxi Province Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi’an 710072, China

Optimization Of Pore Structure And Wet Tribological Properties Of Paper-Based Friction Materials Using Chemical Foaming Technology, Chang Li, Jie Fei, Enzhi Zhou, Rui Lu, Xiaohang Cai, Yewei Fu, Hejun Li

Friction

Paper-based friction materials are porous materials that exhibit anisotropy; they exhibit random pore sizes and quantities during their preparation, thereby rendering the control of their pore structure difficult. Composites with different pore structures are obtained by introducing chemical foaming technology during their preparation to regulate their pore structure and investigate the effect of pore structure on the properties of paper-based friction materials. The results indicate that the skeleton density, total pore area, average pore diameter, and porosity of the materials increase after chemical foaming treatment, showing a more open pore structure. The addition of an organic chemical foaming agent improves …


Numerical Study On Butterfly Wings Around Inclusion Based On Damage Evolution And Semi-Analytical Method, Ye ZHOU, Caichao ZHU, Xiaojin CHEN, Wei YE 2022 State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400030, China;College of Aerospace Engineering, Chongqing University, Chongqing 400044, China

Numerical Study On Butterfly Wings Around Inclusion Based On Damage Evolution And Semi-Analytical Method, Ye Zhou, Caichao Zhu, Xiaojin Chen, Wei Ye

Friction

Butterfly wings are closely related to the premature failure of rolling element bearings. In this study, butterfly formation is investigated using the developed semi-analytical three-dimensional (3D) contact model incorporating inclusion and material property degradation. The 3D elastic field introduced by inhomogeneous inclusion is solved by using numerical approaches, which include the equivalent inclusion method (EIM) and the conjugate gradient method (CGM). The accumulation of fatigue damage surrounding inclusions is described using continuum damage mechanics. The coupling between the development of the damaged zone and the stress field is considered. The effects of the inclusion properties on the contact status and …


Reclined Trend Of Alkyl Chain Of Sodium Dodecylbenzenesulfonate Molecules Induced By Friction, Xianzhang WANG, Yuan LIU, Liran MA, Xuefeng XU, Yu TIAN 2022 State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

Reclined Trend Of Alkyl Chain Of Sodium Dodecylbenzenesulfonate Molecules Induced By Friction, Xianzhang Wang, Yuan Liu, Liran Ma, Xuefeng Xu, Yu Tian

Friction

Surfactants tend to adsorb on the surface/interface mostly in a directional manner. The alkyl chain orientation and conformation order for molecular monolayers of sodium dodecylbenzenesulfonate (SDBS) at low concentrations are studied by using the sum frequency generation vibrational spectroscopy (SFG-VS). The molecular arrangement of the surfactants adsorbed at the solid/liquid interface is further investigated. It is found that the arrangement of the SDBS at the interface becomes relatively ordered with increasing bulk concentration. Meanwhile, the orientation angle reduces gradually, and the molecules tend to be upright state. In addition, the effect of friction on the conformation order and orientation angle …


Macroscale Superlubricity Achieved Via Hydroxylated Hexagonal Boron Nitride Nanosheets With Ionic Liquid At Steel/Steel Interface, Zhiwen ZHENG, Xiaolong LIU, Guowei HUANG, Haijie CHEN, Hongxiang YU, Dapeng FENG, Dan QIAO 2022 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;University of Chinese Academy of Sciences, Beijing 100049, China

Macroscale Superlubricity Achieved Via Hydroxylated Hexagonal Boron Nitride Nanosheets With Ionic Liquid At Steel/Steel Interface, Zhiwen Zheng, Xiaolong Liu, Guowei Huang, Haijie Chen, Hongxiang Yu, Dapeng Feng, Dan Qiao

Friction

Macroscale superlubricity is a prospective strategy in modern tribology to dramatically reduce friction and wear of mechanical equipment; however, it is mainly studied for point-to-surface contact or special friction pairs in experiments. In this study, a robust macroscale superlubricity for point-to-point contact on a steel interface was achieved for the first time by using hydroxylated modified boron nitride nanosheets with proton-type ionic liquids (ILs) as additives in ethylene glycol aqueous (EGaq). The detailed superlubricity process and mechanism were revealed by theoretical calculations and segmented experiments. The results indicate that hydration originating from hydrated ions can significantly reduce the …


Robustness Of Structural Superlubricity Beyond Rigid Models, Shizhe FENG, Zhiping XU 2022 Applied Mechanics Laboratory, Department of Engineering Mechanics and Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China

Robustness Of Structural Superlubricity Beyond Rigid Models, Shizhe Feng, Zhiping Xu

Friction

Structural superlubricity is a theoretical concept stating that the friction force is absent between two rigid, incommensurate crystalline surfaces. However, elasticity of the contact pairs could modify the lattice registry at interfaces by nucleating local slips, favoring commeasure. The validity of structural superlubricity is thus concerned for large-scale systems where the energy cost of elastic distortion to break the lattice registry is low. In this work, we study the size dependence of superlubricity between single-crystal graphite flakes. Molecular dynamics simulations show that with nucleation and propagation of out-of-plane dislocations and strained solitons at Bernal interfaces, the friction force is reduced …


Polyethylene Glycol Derived Carbon Quantum Dots Nanofluids: An Excellent Lubricant For Diamond-Like Carbon Film/Bearing Steel Contact, Fu WANG, Lunlin SHANG, Guangan ZHANG, Zhaofeng WANG 2022 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

Polyethylene Glycol Derived Carbon Quantum Dots Nanofluids: An Excellent Lubricant For Diamond-Like Carbon Film/Bearing Steel Contact, Fu Wang, Lunlin Shang, Guangan Zhang, Zhaofeng Wang

Friction

Polyethylene glycol derived carbon quantum dots nanofluids were synthesized via a slow thermal oxidation process. The size of carbon quantum dots was ca. 2 nm and had a decreasing trend with the increase of oxidation time. When used as lubricant in a diamond-like carbon film/bearing steel interface, the nanofluids achieved an ultra-low friction coefficient (μ ≈ 0.02), much lower than that of original polyethylene glycol (μ = 0.12). The worn surface analyses revealed that the nanofluids could effectively inhibit the tribo-oxidation of steel counterpart that occurred under original polyethylene glycol lubrication, and hence reduced the abrasion component of friction. Especially, …


Ionic Liquids As Boundary Additives In Water-Based And Pao Lubricants, Wahyu WIJANARKO, Hamid KHANMOHAMMADI, Nuria ESPALLARGAS 2022 Norwegian Tribology Center, Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway;Department of Mechanical Engineering, Sepuluh Nopember Institute of Technology (ITS), Surabaya 6011, Indonesia

Ionic Liquids As Boundary Additives In Water-Based And Pao Lubricants, Wahyu Wijanarko, Hamid Khanmohammadi, Nuria Espallargas

Friction

Ionic liquids have been widely discussed as potential lubricants, however, their properties make them also very good potential candidates as lubricant additives (e.g., friction modifiers and anti-wear). In this work, the tribological study of two ionic liquids (tributylmethylphosphonium dimethylphosphate (PP), and 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphate (BMP)) as lubricant additives has been performed on stainless steel (AISI 316L) exposed to polar (water-glycol) and non-polar (polyalphaolefin) based lubricants under boundary lubricating conditions. The performance of these ionic liquids as lubricant additives has been compared to a classical organic friction modifier (dodecanoic acid (C12)). The water–glycol lubricant formulated with the two ionic liquids showed friction …


High Temperature Induced "Glaze" Layer Formed In Hvof-Sprayed Nicrwmocucbfe Coating And Its Wear Reduction Mechanism, Yijing WANG, Xiaoqin ZHAO, Enkang HAO, Zhenyu BU, Yulong AN, Huidi ZHOU, Jianmin CHEN 2022 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

High Temperature Induced "Glaze" Layer Formed In Hvof-Sprayed Nicrwmocucbfe Coating And Its Wear Reduction Mechanism, Yijing Wang, Xiaoqin Zhao, Enkang Hao, Zhenyu Bu, Yulong An, Huidi Zhou, Jianmin Chen

Friction

The in-situ formation of oxides on alloy surface induced by high temperature can effectively reduce wear and resist oxidation. In consideration of the solid solution strengthening effect and great oxidation resistance of additional elements at elevated temperature, the NiCrWMoCuCBFe coating was prepared by high velocity oxygen flame (HVOF) spraying technology, and its tribological behavior was scrutinized from 25 to 800 °C. By means of high temperature Vickers hardness tester and high temperature X-ray diffractometer, the mechanical properties and microstructures of NiCrWMoCuCBFe coating were measured. And the effect of the mechanical properties and microstructures of the coating on tribological performance was …


An Investigation Into The Velocity-Dependence Of The Coefficient Of Friction Between Concrete And Maraging Steel, Trace A. Duncan 2022 Mississippi State University

An Investigation Into The Velocity-Dependence Of The Coefficient Of Friction Between Concrete And Maraging Steel, Trace A. Duncan

Theses and Dissertations

This work investigates the velocity-dependent coefficient of friction between concrete and 300 Maraging steel over short displacements. A modified torsional Hopkinson bar is utilized for rotating thin-walled steel rings in contact with a concrete disk under static precompression. Rotational velocity is varied between tests to determine the velocity dependence of the friction coefficient. Normal force is varied between certain tests to determine the pressure dependence of the friction coefficient between the concrete and steel. Three different types of concrete are tested to deduce any composition effect on the friction coefficient. Dry and greased conditions’ impact on the friction coefficient are …


Preparation And Wear Properties Of High-Vanadium Alloy Composite Layer, Fangfang WANG, Liujie XU, Shizhong WEI, Xi WANG, Chong CHEN, Yucheng ZHOU 2022 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China

Preparation And Wear Properties Of High-Vanadium Alloy Composite Layer, Fangfang Wang, Liujie Xu, Shizhong Wei, Xi Wang, Chong Chen, Yucheng Zhou

Friction

A high-vanadium alloy composite layer was prepared on the surface of a carbon steel using cast composite technology, and the wear properties of the composite layer were investigated. The results showed that the microstructure of the composite layer was composed of primary vanadium carbides (VC), flake martensite, residual austenite, and fine VC. The hardness of the cast alloy layer was 63 HRC. The abrasive wear resistance and impact wear resistance were increased by 60% and 26%, respectively, compared with those of high-chromium cast iron. The excellent wear resistance of the cast alloy layer is attributed to the high-hardness primary vanadium …


An Advanced Efficient Model For Adhesive Wear In Elastic–Plastic Spherical Contact, Haibo ZHANG, Izhak ETSION 2022 School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;Department of Mechanical Engineering, Technion, Haifa 32000, Israel

An Advanced Efficient Model For Adhesive Wear In Elastic–Plastic Spherical Contact, Haibo Zhang, Izhak Etsion

Friction

A finite element (FE) model combining submodel technique is presented for the adhesive wear in elastic–plastic spherical contact. It consists of a global model, showing the potential location of fracture under combined normal and tangential loading, and a refined mesh submodel covering only the region near the potential fracture. This allows to describe the morphology of wear particle more accurately than that in a previously developed model by the authors. A range of normal loading is studied to show its effect on the shape and volume of wear particles. Two main regimes of mild and severe wear (along with a …


Unlocking The Secrets Behind Liquid Superlubricity: A State-Of-The-Art Review On Phenomena And Mechanisms, Tianyi HAN, Shuowen ZHANG, Chenhui ZHANG 2022 State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

Unlocking The Secrets Behind Liquid Superlubricity: A State-Of-The-Art Review On Phenomena And Mechanisms, Tianyi Han, Shuowen Zhang, Chenhui Zhang

Friction

Superlubricity, the state of ultralow friction between two sliding surfaces, has become a frontier subject in tribology. Here, a state-of-the-art review of the phenomena and mechanisms of liquid superlubricity are presented based on our ten-year research, to unlock the secrets behind liquid superlubricity, a major approach to achieve superlubricity. An overview of the discovery of liquid superlubricity materials is presented from five different categories, including water and acid-based solutions, hydrated materials, ionic liquids (ILs), two-dimensional (2D) materials as lubricant additives, and oil-based lubricants, to show the hydrodynamic and hydration contributions to liquid superlubricity. The review also discusses four methods to …


Bio-Inspired Smart Surface To Achieve Controllable Locomotion Through Adjustable Anisotropic Friction, Zhongying JI, Shiyu QIN, Shuanhong MA, Xin JIA, Xiaolong WANG, Feng ZHOU 2022 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

Bio-Inspired Smart Surface To Achieve Controllable Locomotion Through Adjustable Anisotropic Friction, Zhongying Ji, Shiyu Qin, Shuanhong Ma, Xin Jia, Xiaolong Wang, Feng Zhou

Friction

Anisotropic friction generated by microstructured surfaces is crucial for performing functions such as directional locomotion and adhesion in biological systems. Hence, an epoxy-based shape memory polymer (SMP) incorporating Fe3O4 nanoparticles is used in this study to create a smart surface with oriented structures to mimic anisotropic friction and exploit human-developed controllable locomotion systems. Applying the specific properties of the epoxy-based SMP, fast switching friction can be achieved by adjusting the topography and stiffness of the microstructures on the surface. In addition, the photothermogenesis effect of Fe3O4 nanoparticles induces changes in the asymmetric topography and …


Robust Scalable Reversible Strong Adhesion By Gecko-Inspired Composite Design, Xiaosong LI, Pengpeng BAI, Xinxin LI, Lvzhou LI, Yuanzhe LI, Hongyu LU, Liran MA, Yonggang MENG, Yu TIAN 2022 State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

Robust Scalable Reversible Strong Adhesion By Gecko-Inspired Composite Design, Xiaosong Li, Pengpeng Bai, Xinxin Li, Lvzhou Li, Yuanzhe Li, Hongyu Lu, Liran Ma, Yonggang Meng, Yu Tian

Friction

Bio-inspired reversible adhesion has significant potential in many fields requiring flexible grasping and manipulation, such as precision manufacturing, flexible electronics, and intelligent robotics. Despite extensive efforts for adhesive synthesis with a high adhesion strength at the interface, an effective strategy to actively tune the adhesion capacity between a strong attachment and an easy detachment spanning a wide range of scales has been lagged. Herein, we report a novel soft-hard-soft sandwiched composite design to achieve a stable, repeatable, and reversible strong adhesion with an easily scalable performance for a large area ranging from ~1.5 to 150 cm2 and a high …


Role Of Capillary Adhesion In The Friction Peak During The Tacky Transition, Tianyan GAO, Jiaxin YE, Kaisen ZHANG, Xiaojun LIU, Yan ZHANG, Kun LIU 2022 Institute of Tribology, School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China

Role Of Capillary Adhesion In The Friction Peak During The Tacky Transition, Tianyan Gao, Jiaxin Ye, Kaisen Zhang, Xiaojun Liu, Yan Zhang, Kun Liu

Friction

The friction peak that occurs in tire–road sliding when the contact changes from wet to dry was previously attributed to capillary cohesion, van der Waals attraction, and surface roughness, but the detailed mechanisms have yet to be revealed. In this study, friction and static contact experiments were conducted using a custom-built in situ optical microtribometer, which allowed us to investigate the evolution of the friction, normal load, and contact area between a polydimethylsiloxane (PDMS) film and a silicon nitride ball during water volatilization. The friction coefficient increased by 100%, and the normal force dropped by 30% relative to those in …


Optimization Of Several Surface Treatment Processes For Alleviating Fretting Damage Of A Locking Pin, Jifan HE, Zhenbing CAI, Yanping REN, Jinfang PENG, Jianhua LIU, Minhao ZHU 2022 School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China

Optimization Of Several Surface Treatment Processes For Alleviating Fretting Damage Of A Locking Pin, Jifan He, Zhenbing Cai, Yanping Ren, Jinfang Peng, Jianhua Liu, Minhao Zhu

Friction

The operational safety and reliability of a variable gauge train are affected by the anti-fretting wear performance of the locking mechanism. The main purpose of this study is to optimize the surface treatment process for a locking pin material under actual service conditions to alleviate fretting damage. Based on the two basic principles of surface strengthening and friction reduction, a substrate (AISI 4135 steel) surface was treated by laser quenching (LQ), plasma nitriding (PN), and bonded MoS2 coating. Systematic fretting wear tests were conducted, and the wear behavior and damage mechanism of various treated surfaces were comprehensively investigated. The …


Laser Pattern-Induced Unidirectional Lubricant Flow For Lubrication Track Replenishment, Chenglong LIU, Feng GUO, Patrick WONG, Xinming LI 2022 School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China;Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China

Laser Pattern-Induced Unidirectional Lubricant Flow For Lubrication Track Replenishment, Chenglong Liu, Feng Guo, Patrick Wong, Xinming Li

Friction

Effective oil replenishment to the lubrication track of a running bearing is crucial to its sustainable operation. Reliable practical solutions are rare despite numerous theoretical studies were conducted in the last few decades. This paper proposes the use of surface effect, wettability gradient, to achieve the goal. This method is simple and can be nicely implemented using femtosecond laser ablation. A periodic comb-tooth-shaped pattern with anisotropic wetting capability is devised and its effect on the anisotropic spreading behaviour of an oil droplet is studied. Results show that the comb-tooth-shaped pattern enables the rearrangement of oil distribution, thereby escalating oil replenishment …


Digital Commons powered by bepress