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Thermal and flow characteristics of micropolar nanofluid with microorganisms: Insights from the Darcy-Forchheimer relation Tribol. Int. (IF 6.2) Pub Date : 2024-03-21 M. Ijaz Khan, Sherzod Abdullaev, Mehdi Akermi, Ilyas Khan
The Darcy-Forchheimer relation is a key concept utilized in the analysis of fluid dynamics, specifically in understanding the pressure drop experienced by a fluid as it traverses a porous medium or a conduit with added resistance. This resistance may stem from various factors such as turbulence and viscosity. The Forchheimer coefficient serves as a metric to quantify this resistance and is typically
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Investigating the effects of base oil type on microstructure and tribological properties of polyurea grease Tribol. Int. (IF 6.2) Pub Date : 2024-03-20 Jiabei Wang, Zhaoyang Guo, Wenjing Hu, Hengyi Lu, Jiusheng Li
The soaring prices and physiological toxicity of lithium-based grease make polyurea grease a promising alternative due to its balanced cost and performance. Employing preformed thickeners to avoid toxic raw materials has become a preferred method for eco-friendly preparation of polyurea grease. However, the underlying mechanism of base oil modulates the microstructure of polyurea greases prepared with
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The effect of thickener structure degradation on tribological properties: Study on the decay mechanism of polyurea grease under mechanical-thermal aging conditions Tribol. Int. (IF 6.2) Pub Date : 2024-03-20 Guangrong Sha, Rui Yu, Bingbing Lai, Yiping Sun, Wenjing Lou, Xiaobo Wang, Shuai Li, Xiaoling Liu
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Study of the effect of overlap rate on the failure form, microstructure and wear resistance of multilayer laser cladding on grey cast iron surfaces Tribol. Int. (IF 6.2) Pub Date : 2024-03-20 Runze Wei, Muhua Mao, Jianguo Liang, Chunjiang Zhao, Changyao Ouyang, Rui Wang, Qiaofeng Bai, Rui Deng, Huan Li, Qiang Bian
Laser cladding is less used in the repair of cast iron parts. In this paper, multiple layers of austenitic stainless steel powders with different overlap rates were laser clad by the process of adding a transition layer to explore the feasibility of multilayer cladding of grey cast iron. The study results show that the higher cladding layers tends to cause cracking and warping of substrate, and the
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FRETTING WEAR: A PHENOMOLOGICAL APPROACH Tribol. Int. (IF 6.2) Pub Date : 2024-03-19 Roland S. Timsit
An analytical description of fretting wear is proposed wherein the volume of wear debris either removed from the sliding interface or retained within these areas, is represented as a fraction of the freshly-produced debris in each fretting pass. In the proposed model, the volumes respectively of removed debris and of retained debris are tallied over each pass of a fretting sequence to yield a closed
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Enhanced wear resistance in (CoCrNi)94Al3Ti3 medium-entropy alloy at high temperatures via nano-Al2O3 reinforcing phase Tribol. Int. (IF 6.2) Pub Date : 2024-03-19 Kaixuan Yu, Jun Cheng, Qianqian Cheng, Yushan Geng, Shengyu Zhu, Ming Liu, Shanhong Wan, Jun Yang
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Study on bending fretting fatigue behaviour of 15-5PH stainless steel with different fretting regimes Tribol. Int. (IF 6.2) Pub Date : 2024-03-19 Jinfang Peng, Yiguang Zhao, Ruilin Chen, Yuan Song, Zhengye Zhong, Jianhua Liu, Yanping Ren, Minhao Zhu
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Scale-dependent wetting behavior of bioinspired lubricants on electrical discharge machined Ti6Al4V surfaces Tribol. Int. (IF 6.2) Pub Date : 2024-03-19 Katarzyna Peta, Tomasz Bartkowiak, Marek Rybicki, Przemyslaw Galek, Michał Mendak, Michał Wieczorowski, Christopher A. Brown
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Blade-coating-casing rubbing induced vibration responses and wear characteristics Tribol. Int. (IF 6.2) Pub Date : 2024-03-19 Hui Ma, Hong Guan, Lin Qu, Tianrui Yang, Yao Zeng, Yanyan Chen, Zhimin Zhu, Hongji Wang
To study the rubbing-induced wear characteristics and vibration responses in a blade-coating-casing system, a dynamic model of the rotating blade-coating-casing system with rubbing is established considering the rotational effect of blades and the aerodynamic force of blades. Then, the wear models were verified by comparing results in the literature. Finally, the numerical simulation is conducted considering
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A data-driven exploration of multi pad bidirectional adjustable bearings and deep learning model-based optimization Tribol. Int. (IF 6.2) Pub Date : 2024-03-19 A. Ganesha, H. Girish, Raghuvir Pai, S.M.Abdul Khader
The evolution of journal bearings, from fixed profiles to adaptive configurations, signifies a captivating progression in journal bearing technology. A notable innovation in adaptive bearings is Multi-pad Bidirectional Adjustable Bearing (MBAB), which can control film thickness in radial and circumferential directions. This paper introduces a novel data-driven approach, utilizing machine learning to
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Fretting wear mechanism of bones against a plasma-sprayed hydroxyapatite/copper coating on a tantalum substrate Tribol. Int. (IF 6.2) Pub Date : 2024-03-19 Yutao Zhang, Wurikaixi Aiyiti, Cijun Shuai, Lanlan Dong
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Fretting fatigue crack nucleation analysis under a variable coefficient of friction Tribol. Int. (IF 6.2) Pub Date : 2024-03-19 Nicolás Díez Molina, Libardo V. Vanegas Useche, Carlos A. Mesa, Can Wang, Lihua Wang, Magd Abdel Wahab
Fretting fatigue is a phenomenon that occurs when two surfaces come into contact and experience oscillatory stresses and displacements of small amplitude. This can lead to a significant reduction in mechanical parts’ lifetime. The complexity of this type of problems relies on the many variables that can affect the results. One of its most important variables is the Coefficient of Friction (CoF), which
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Transient lubrication analysis of journal-thrust coupled bearing considering time-varying loads and thermal-pressure coupled effect Tribol. Int. (IF 6.2) Pub Date : 2024-03-19 Jiahao Shi, Bin Zhao, Liyue Tu, Qi Xin, Zhongliang Xie, Ning Zhong, Xiqun Lu
The journal-thrust coupled bearing (abbreviated as JTC bearing) works at the end of the crankshaft in diesel engine, with the function of carrying radial load and prevent axial movement of the crankshaft. The journal part and the thrust part of this special bearing both form the oil film lubrication when subjected to the time-varying loads in axial and radial directions during the working condition
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Enhancing Tribological Performance in PM Vanadis 6 Steel through Optimization of Cryogenic and Tempering Treatment Tribol. Int. (IF 6.2) Pub Date : 2024-03-18 Venu Yarasu, Peter Jurci, Jakub Hornik
Vanadis 6, which gained popularity for industrial applications due to increased strength and wear resistance, benefited from cryogenic treatment. This study investigated the influence of cryogenic and tempering treatments on the tribological properties of Vanadis 6 cold-work tool steel, crucial for cost-effective and durable tooling. Dry sliding wear experiments using Taguchi design under varying loads
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Tribological performance of fatty acid ammonium ionic liquids as anti-wear additives in water-based fluids Tribol. Int. (IF 6.2) Pub Date : 2024-03-18 Mingjian Zhang, Haichao Liu, Enhui Zhang, Yunlong Chen, Weimin Li, Shunfeng Cheng
In this study, we synthesized eight water-soluble ionic liquids (ILs) and investigated their tribological performance as additives in water-diethylene glycol (WDG) base fluids. The results of the tribological test suggested that these ILs additives demonstrate promising capabilities in friction reduction and anti-wear for water lubricated contacts. The ILs with the longest carboxylic chain length,
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The design method for surface texture of sliding friction pairs based on machine learning under mixed lubrication Tribol. Int. (IF 6.2) Pub Date : 2024-03-17 Zhenshun Li, Jiaqi Li, Ben An, Rui Li
Surface texture plays an important role in reducing friction, which has been widely applied in mechanical equipment. In this paper, a surface texture design method for sliding friction pairs based on machine learning is proposed, which consists of three parts: model training and construction, texture design and result verification. Firstly, artificial neural network (ANN) and gradient boosting decision
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Effect of microstructure on the corrosion-friction behavior of low-carbon martensitic stainless steel Tribol. Int. (IF 6.2) Pub Date : 2024-03-17 Tingyu Zhang, Biao Zhou, Suxin Wei, Yanli Wang, Shenghua Zhang
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Effect of Nano-SiC on microstructure evolution and enhanced high wear resistance mechanism of laser surface alloyed M42 high-speed steel Tribol. Int. (IF 6.2) Pub Date : 2024-03-16 Suiyuan Chen, Zhong Cong, Zun Wang, Jialu Chen, Tong Cui, Jing Liang, Mei Wang
M42 high-speed steel is one of the main materials for preparing bimetallic band saw parts. In this paper, nano-SiC particles of different densities (0~1.00mg/mm) were precoated on the surface of M42 high-speed steel samples, then, the samples were prepared by laser alloying. The matching relationship between the quantity, size, and type of martensite and MC carbides in laser alloyed samples play a
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Bi-directional misalignment effects on transient tribo-dynamics of offset-halves journal bearings subjected to step loading Tribol. Int. (IF 6.2) Pub Date : 2024-03-16 Kai Wang, Xinyuan Wang, Xilong Ji, Kaidi Zhu, Haizhou Huang, Le Pang, Lihua Yang
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Wedge-shaped lyophilic pattern on superlyophobic surface for unidirectional liquid guidance and lubrication enhancement Tribol. Int. (IF 6.2) Pub Date : 2024-03-16 Yang Liu, Jiawei Chen, Hui Zhang, Hanchi Gou, Guangneng Dong
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Composite thermal oil film lubrication model for hybrid journal bearings Tribol. Int. (IF 6.2) Pub Date : 2024-03-15 Chao Zhang, Xiaolong Zhang, Pengpeng Dong, Hongjuan Zhang, Zhijian Zheng, Junhui Zhang, Bing Xu
Hybrid journal bearings are crucial components in many equipment, such as nuclear reactor cooling pumps and hydraulic motors. However, there exists a significant challenge to understand the lubrication behaviors of hybrid bearings with multiple thermal effects at low-speed, heavy-load conditions. Therefore, a composite thermal lubrication model is proposed, which includes four thermal effects: edge
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Study on the wear characteristics of INCO939 alloy manufactured by laser powder bed fusion and casting. Tribol. Int. (IF 6.2) Pub Date : 2024-03-15 Şener Karabulut, Halil Karakoç, Musa Bilgin, Levent Subaşı, Gökhan Dursun, Ozan Can Ozaner
This study examines the wear characteristics of INCO939 specimens spanning temperatures from 24 °C to 600 °C. Hardness measurements revealed higher values for laser powder bed fusion (LPBF) fabricated and heat-treated samples compared to cast ones. Friction tests indicated increasing coefficient of friction (COF) values for cast samples at high temperatures, while LPBF-fabricated and heat-treated samples
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Effect of cryogenic aging and test-environment on the tribological and mechanical properties of PEEK composites Tribol. Int. (IF 6.2) Pub Date : 2024-03-14 Maksim Nikonovich, Amilcar Ramalho, Nazanin Emami
This study investigated mechanical and tribological properties of polyetheretherketone (PEEK) and PEEK composites, before and after aging in liquid nitrogen for 5 months. Tribological tests conducted at 25C and at -100C in air and in high vacuum (10Pa) environment revealed the effect of matrix modification, fillers, environment, temperature, and cryogenic aging on their performances. Cryogenic aging
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Fretting corrosion running regime and damage mechanism evolution of zirconium alloy mated with Inconel 718 alloy in high temperature high pressure water environment Tribol. Int. (IF 6.2) Pub Date : 2024-03-14 L.Z. Kang, Y.H. Lu, W.W. Bian, L. Xin, Y.M. Han
Fretting corrosion behavior and damage mechanism of Zr-4 alloy mated with Inconel 718 alloy under different fretting regimes in high temperature high pressure water were studied. The corresponding running condition fretting corrosion map (RCFM) and material response fretting corrosion map (MRFM) were established. The results showed that the change of fretting regime led to the differences of fretting
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Optimization of surface texture distribution on the thrust bearing using the mass-conserving cavitation boundary condition: Theory and experiments Tribol. Int. (IF 6.2) Pub Date : 2024-03-14 Yulong Li, Zhehao Zhang, Yongyong He, Jianbin Luo
This study developed a numerical optimization model for the texture distribution in thrust bearings, employing the flat-headed chevron and circular dimple, and utilizing a mass-conserving cavitation boundary. A hybrid of the genetic algorithm and sequential quadratic programming algorithm is utilized. The results indicate the highest load-carrying capacity can be obtained by optimizing the texture
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Polishing performance and mechanism of a novel Fe-based slurry for chemical mechanical polishing Tribol. Int. (IF 6.2) Pub Date : 2024-03-14 Shidong Chen, Hong Lei
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Corrigendum to “Modeling and friction response analysis of rocking-sliding friction of drill string in directional wells” [Tribol Int 193C (2024) 109466] Tribol. Int. (IF 6.2) Pub Date : 2024-03-14 Jiayan Zou, Xingming Wang, Yunhai Wang, Yang Liu, Ping Chen
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Lipophilic and friction properties of 20CrMnTi steel with laser-induced texturing Tribol. Int. (IF 6.2) Pub Date : 2024-03-14 Yu Zhang, Xianda Jia, Kun He, Xinran Dong, Zhiyong Wang, Kai Liao
Laser surface texturing is an effective method to enhance gear lubrication by improving lipophilic properties, thereby increasing transmission performance and longevity. This study investigated the effects of laser parameters on lipophilicity using a grid texture and found that a scanning speed of 100 mm/s maximized diffusion and climbing. The textured specimens showed higher wetting hysteresis and
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Temperature evolution prediction of engine big-end bearing by tribo-dynamics modeling and wireless measurement verification Tribol. Int. (IF 6.2) Pub Date : 2024-03-13 Jiabao Yin, Rui Zhang, Bugao Lyu, Xianghui Meng
Thermally-induced seizure (TIS) issue of the big-end bearing could lead to catastrophic engine failures. Evaluating bearing temperature during the design phase effectively identifies this issue in advance. However, accurate prediction remains challenging due to complex influencing factors and variable friction states. This work develops a more comprehensive model for the big-end bearing temperature
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Contact strip of pantograph heuristic wear model and its application Tribol. Int. (IF 6.2) Pub Date : 2024-03-13 Ning Zhou, Xingshuai Zhi, Yao Cheng, Yi Sun, Jiale Wang, Zhenglong Gu, Zeyu Li, Weihua Zhang
The contact strip of pantograph is an essential component that directly contacts with overhead catenary wire and collects current, it is crucial to seek a convenient and accurate wear predictive model for this important component. Combining mechanistic analysis and data-driven approaches, this study established a heuristic wear model of strip, which has been validated the flexibility and accuracy through
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Investigation of elevated temperature microstructural stability and tribological behavior of MoxNbTiZr refractory high-entropy alloy coatings optimized by Mo-doping Tribol. Int. (IF 6.2) Pub Date : 2024-03-13 Qiang Gao, Hao Liu, Peijian Chen
Refractory high-entropy alloys (RHEAs) possess substantial potential for applications in high-temperature environments. In this work, the structural and high-temperature properties of MoNbTiZr RHEA coatings are optimized by Mo-doping. The results show that Mo-doping promotes the HCP phase precipitation and proliferation of nanotwins, strengthening the microhardness but weakening the fracture toughness
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Impact-abrasive wear property of ZrO2 toughened Al2O3 ceramic particles reinforced high manganese steel matrix composites Tribol. Int. (IF 6.2) Pub Date : 2024-03-13 Zhijie Wang, Mojin Zhou, Yehua Jiang, Yudong Sui, Zulai Li
ZrO-toughened AlO (ZTA) ceramic particle–reinforced high manganese steel (HMS) matrix composites are a promising class of wear-resistant structural materials for various purposes such as mining. In this study, millimeter-scale ZTA/HMS composites were prepared by cast infiltration method. Using SEM, EPMA, TEM, nanoindentation, a microhardness tester, and an impact-abrasive wear machine, the microscopic
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Influence of micro-texture radial depth variations on the tribological and vibration characteristics of rolling bearings under starved lubrication Tribol. Int. (IF 6.2) Pub Date : 2024-03-13 Risheng Long, Yuhao Sun, Yimin Zhang, Qingyu Shang, Sangharatna M. Ramteke, Max Marian
Surface micro-texturing involves creating microscopic pits or textures, serving as lubricant reservoirs to enhance lubrication distribution, potentially reducing friction and wear. This study specifically delves into the influence of varied depth patterns of pits on the operational performance of textured rolling bearings under severe lubrication conditions. Five distinct patterns with a fixed pit
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Tribological, magnetic and electric properties of magnetic polymer composites for airgap-less application Tribol. Int. (IF 6.2) Pub Date : 2024-03-12 Bartłomiej Nowacki, Krystian Mistewicz, Anna Starczewska, Jakub Jała, Mateusz Kozioł, Piotr Olesik, Jakub Smoleń, Paweł Kowol, Adam Pilśniak, Aleksandra Kolano-Burian
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Mechanical and tribological performance of copper matrix self-lubricating composite prepared by resonant acoustic mixing powder Tribol. Int. (IF 6.2) Pub Date : 2024-03-12 Youwang Tu, XiuChong Zhu, Xiao Kang, Lei Zhang, Chenxu Liu
CuNi-WS self-lubricating composites with 10 wt% WS were fabricated by combining resonant acoustic mixing (RAM) powders and pressureless sintering in an H atmosphere. The influence of acceleration, a critical process parameter of RAM, on the microstructures, mechanical and tribological performance of the composites were investigated, then the mechanism of acceleration on the performance of composites
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Thermal mixed elastohydrodynamic lubrication modeling and analysis of the lubricated non-conformal contacts with non-Gaussian surface roughness and coating Tribol. Int. (IF 6.2) Pub Date : 2024-03-12 Chunxing Gu, Xiaoli Sheng, Di Zhang, Xianghui Meng
The lubricated non-conformal contact generally works under the mixed-EHL regime. Optimizing the surface topography or selecting the right coating is an effective way to improve its performance. This paper presented an improved mixed-TEHL model for the lubricated non-conformal contacts with the effects of roughness and coating in consideration. The effect of coating was solved analytically by employing
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Effect of Ti3SiC2 replacing graphite on the microstructure and properties of Cu-Sn matrix composites Tribol. Int. (IF 6.2) Pub Date : 2024-03-12 Xiukuang Zhang, Yaqian Liang, Qian Lei, Shishui Xiao, Yanbin Jiang
A new type of intelligent lubrication functional material, Cu-5Sn/22vol%CrC/16vol%TiSiC composite, was fabricated by powder metallurgy. The mechanical and tribological properties of Cu-Sn/CrC/TiSiC composite were studied. TiSiC, as a lubricating component, had a better reinforcing effect than graphite. Compared with Cu-Sn/CrC/Gr composite, Cu-Sn/CrC/TiSiC composite exhibited a 97% increase in hardness
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A comprehensive multi-parameter optimization method of squeeze film damper-rotor system using hunter-prey optimization algorithm Tribol. Int. (IF 6.2) Pub Date : 2024-03-12 Yufei Xu, Hongrui Cao, Jianghai Shi, Shiyuan Pei, Kailang She
The squeeze film damper (SFD) is a damping device that is widely used in turbomachinery. A well-designed SFD structure can effectively mitigate vibration at critical speeds, while a poorly designed SFD may increase vibration. The comprehensive multi-parameter optimization method is used for optimizing the vibration response at critical speed and improving the reliability and overall performance by
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Microstructure and tribological properties of copper/graphite composites with Ti3AlC2 addition prepared by rapid hot press sintering Tribol. Int. (IF 6.2) Pub Date : 2024-03-12 Yuanming Su, Feng Jiang, Zeyu Xiao, Feifei Wu, Mengjun Long
Copper/graphite composites are widely used due to their excellent electrical, thermal, and self-lubricating properties. However, their mechanical and anti-wear properties are usually limited by brittle graphite and soft copper matrix. Enhancing the properties of composites by further introducing harder ceramic particles is an effective way. However, these particles are usually poorly wetted to metal
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Solid lubrication performance of Ti2CTx coatings with reduced friction and extended durability Tribol. Int. (IF 6.2) Pub Date : 2024-03-11 Muhammad Chhattal, Yu Kaihuan, Salamat Ali, Dario F. Zambrano, Andreas Rosenkranz, Philipp G. Grützmacher, Zhenbin Gong, Junyan Zhang
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Assessment of benzoxazine resins as brake pad friction material binder: Tribological properties and PM emission Tribol. Int. (IF 6.2) Pub Date : 2024-03-11 Davide Carlevaris, Luca Fambri, Cinzia Menapace, Giovanni Straffelini
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A fully coupled finite element solution for the mixed elastohydrodynamic lubrication of finite line contacts Tribol. Int. (IF 6.2) Pub Date : 2024-03-11 Congcong Fang, Yongdong Peng, Wei Zhou, Xianghui Meng
A fully coupled FE model for mixed EHL of finite line contacts is proposed, integrating all of the governing equations into a monolithic system. The solution reveals the fully coupled model achieves 5% higher accuracy and 50% greater efficiency compared to the weakly coupled one. Additionally, there is evidence to support the assertion that profiling contributes to the mitigation of surface roughness
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Microstructure and wear resistance of tungsten carbide particle reinforced titanium alloy coating by WAAM Tribol. Int. (IF 6.2) Pub Date : 2024-03-11 Xinxin Guo, Ming Ma, Shuaifeng Zhang, Zhengying Wei
A tungsten carbide particle reinforced Ti-6Al-3Nb-2Zr-1Mo alloy coating was prepared by wire arc additive manufacturing (WAAM) with wire-powder feeding simultaneously. The study shows that the titanium alloy matrix exists in the form of a metastable phase β-Ti, and the addition of tungsten carbide particles significantly refines its grains. Tungsten carbide particles retain a spherical shape, with
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Study on enhanced wear resistance of FeCoCrNi2MoSi high entropy alloy coatings induced by nano-layered eutectic and Laves phase Tribol. Int. (IF 6.2) Pub Date : 2024-03-11 Di Chen, Xiufang Cui, Yajie Guan, Xinyao Li, Sen Ma, Zhongtao Dai, Ziyu Song, Litong Feng, Guo Jin, Jinna Liu
Wear is one of the primary challenges for high-temperature working components. In this paper, FeCoCrNiMoSi eutectic high-entropy alloy coatings were successfully prepared by introducing MoNiSi ternary silicides with Laves structure into FeCoCrNi high-entropy alloys using laser cladding technology. The alloy achieves a balance of strength and toughness through the nanoscale eutectic structure with alternating
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Exceptional mechanical properties and wear behavior of Al2O3 nanoparticle reinforced Ni-W-P coatings Tribol. Int. (IF 6.2) Pub Date : 2024-03-11 Humaira Kousar, Malik Adeel Umer, Khuram Shehzad, Rabeeka Ferdous, Kashif Mehmood, Abdul Basit, Tauheed Shahbaz, Muhammad Yasir, Abdul Shakoor
Successful electrodeposition of superior alumina nano-particle reinforced ternary Ni-W-P composite coatings onto HSLA steel demonstrated remarkable enhancements in mechanical, wear and corrosion resistant properties. Alumina nanoparticle addition (0.2 g/L) notably improved hardness from 8.33 to 12.16 GPa, reducing friction coefficient to 0.2255 and lowered wear rate to 1.946 × 10 mm/m, outperforming
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Fabrication of novel sulfur-containing carbon nanospheres with controlled release of corrosion inhibitor for improved tribological and anti-corrosion performance Tribol. Int. (IF 6.2) Pub Date : 2024-03-11 Sha Liu, Yixin Wang, Guanghao Hu, Shujuan Liu, Qian Ye, Feng Zhou, Weimin Liu
A sulfur-containing carbon nanosphere (SCN) with the corrosion inhibitor M16 (M16 @SCN) was successfully prepared through post-carbonization and then electrostatic adsorption. The as-prepared SCN have rich pore and high specific surface area of 578.9 mg due to high-temperature carbonization of polythiophene (PT), which as a nanocontainer could upload corrosion inhibitor M16 to obtain M16 @SCN. The
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Calculation of operational parameter variation of infinitely long slider bearings with stochastic roughness Tribol. Int. (IF 6.2) Pub Date : 2024-03-11 Dimitrios Skaltsas, Christos I. Papadopoulos
In the framework of stochastic representation of surface roughness, a novel Reynolds-type Equation has been derived recently by the authors and utilized to calculate the average values of a bearing’s operational parameters. To acquire an improved insight to the hydrodynamic lubrication phenomena in rough bearings, the stochasticity of the operational parameters should be described, by calculating their
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The robust superlubricity behaviors of a-C:H films on different roughness interfaces at surface contact scale Tribol. Int. (IF 6.2) Pub Date : 2024-03-10 Kai Wang, Xinchun Chen, Wenli Deng, Peng Huang, Wei Qi, Huajie Tang
Hydrogenated amorphous carbon (a-C:H) film has demonstrated superlubricity in previous studies, but its effectiveness may be limited when applied to engineering components with surface contact and non-ideal smoothness. In this work, four kinds of plane contact friction pairs with different surface roughness (roughness of Sa from 21 nm to 544 nm) were designed and coated with a-C:H film with 43% hydrogen
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Modeling the line contact on an elastic half-space with the statistical approach: Self-affine fractal roughness and numerical framework Tribol. Int. (IF 6.2) Pub Date : 2024-03-10 Tao Yang, Hanmin Peng, Xiongfeng Tang, Guoqing Wang, Gai Zhao, Xiaolong Lu, Bo Feng
This paper presents a line contact model for describing the normal contact between rough surfaces with self-affine fractal roughness based on the statistical approach. An iterative algorithm combining the Levenberg-Marquardt (LM) method with penalty function is proposed to overcome the limitation of restricted indentation depth. Results show a competitive relationship between the plasticity index and
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A study on the effect of factors of piston motion on the piston ring rotation of an engine Tribol. Int. (IF 6.2) Pub Date : 2024-03-10 Kaito Kanemoto, Akemi Ito
Oil consumption of an engine causes particulate matter, catalyst poisoning, and sometimes abnormal combustion such as pre-ignition. One of the factors in oil consumption is oil transport upward through the ring gap in a piston. When the rings rotate and the ring gaps meet and stay a certain position, hence the gaps line up, it is assumed that so more oil can transfer upward. The effect of the piston
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Microstructure effects on improving rolling contact fatigue by a double-quenching heat treatment process for GCr15 steel Tribol. Int. (IF 6.2) Pub Date : 2024-03-08 Wenhu Zhang, Wanjia Li, He Liu, Tiantian He, Sier Deng, Heng Tian, Wenquan Cao
The heat treatment process is important in improving the rolling contact fatigue (RCF) life of GCr15 bearing steel by changing the microstructure. The conventional heat treatment process of GCr15 bearing only has one quenching (CQ) process, and the corresponding RCF life cannot satisfy the requirements of many applications. A double-quenching (DQ) heat treatment with two quenching processes was proposed
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Tribological behaviour of surface modified carbon-fibre-reinforced polyphenylene sulphide under dry condition Tribol. Int. (IF 6.2) Pub Date : 2024-03-08 Sameh Dabees, Y. Athulya Wickramasingha, Bhagya Dharmasiri, Elmer Austria Jr., Behnam Akhavan, David J. Hayne, Luke C. Henderson
This study presents a direct electrochemical modification technique for incorporating two specific small molecules, phenol, and aniline into carbon fibre (CF) surface. These molecules have a strong hydrogen bonding for polyphenylene sulphide (PPS) and are intended to improve the friction and wear properties of PPS/CF composites. The tribological properties of PPS/CF composites were evaluated using
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Synergistic tribological performance of Ti3C2Tx MXene functionalized with ionic liquids Tribol. Int. (IF 6.2) Pub Date : 2024-03-08 Ruisheng Guo, Zihan Liu, Xin Chen, Xiaoqiang Dou, Qian Ye, Xuqing Liu
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A comparative study on the electrical contact behavior of CuZn40 and AgCu10 alloys under fretting wear: Effect of current load Tribol. Int. (IF 6.2) Pub Date : 2024-03-08 Chun-Zheng Zhang, Fei Shen, Liao-Liang Ke
The current load is one of the most significant factors in the reliability of electrical contact under fretting conditions. In this paper, the fretting wear experiments are conducted for CuZn40 and AgCu10 alloys with varied current loads. The variations of electrical contact resistance (ECR), ECR endurance, temperature, and wear volume with the increasing current load of two alloy materials under fretting
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Fabrication of high thermal conductivity and wear resistance graphite/copper composites by microwave hot press sintering Tribol. Int. (IF 6.2) Pub Date : 2024-03-08 Yongfen Sun, Lei Xu, Changhao Zuo, Zhimeng Tang, Huanpei Xia, Guo Zheng
Graphite/copper composites have great potential for tribological applications because of their high thermal and abrasion resistance. In this study, we successfully manufactured graphite/copper composites that demonstrated superior thermal conductivity and wear resistance by employing microwave hot press sintering (MHPS). The results demonstrated an enhancement in the density and hardness of the composites
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Effect of the coefficient of friction on gear-tooth root fatigue for both dry and lubricated running polymer gears Tribol. Int. (IF 6.2) Pub Date : 2024-03-07 S. Matkovič, M. Kalin
Polymer gears are increasingly popular for a variety of applications due to their improved performance, light weight, ease of manufacture and low cost. However, the design of polymer gears and predictions of their useful operating lifetimes require refinements based on a better understanding of all the influential parameters. For example, do dry and lubricated running polymer gears operating with the
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Robustness of frictional anisotropy under high load due to self-folding Tribol. Int. (IF 6.2) Pub Date : 2024-03-07 Yuan Niu, Yi Ren, Zhenghua Zhao, Yuanpu Xu, Wenhao He, Zhibin Lu
Friction anisotropy is not only related to macroscopic natural phenomena, but also closely involves the emerging field of nanotechnology. The previous strategies to achieve friction anisotropy requires delicate adjustment, which is difficult to achieve in method, or easy to disappear under large loads. Here, we report the outstanding robustness of frictional anisotropy caused by its own fold structure
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The influence from PTFE on surface and sub-surface damages of glass fiber reinforced PPS Tribol. Int. (IF 6.2) Pub Date : 2024-03-07 J. Holmgren, Å. Kassman Rudolphi, J. Heinrichs Lindgren
Polymer composites are common materials for tribological components, even at relatively high operating temperatures. One advantage is the possibility to add low friction additives, such as PTFE, to the base material. In this paper the influence of such additives was studied, with focus on surface and sub-surface damages. The polymer composites were PPS with glass fibers (PPS-F), PPS with glass fibers
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Dual-network nanocomposite robust hydrogel with excellent durability properties as cartilage replacement Tribol. Int. (IF 6.2) Pub Date : 2024-03-06 Haiyan Feng, Song Wang, Kai Chen, Xinyue Zhang, Cunao Feng, Xiaowei Li, Dekun Zhang
As bionic lubricating material, hydrogel could not have both lubrication performance and mechanical strength. The sparse cross-linked network hinders the practical application of hydrogel in places where long service life and high load capacity are required. Here we proposed a method of combining dual networks with nano-enhancement to prepare high-strength lubricating Polyvinyl alcohol/polyacrylic
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Influence of GNPs solid lubricant on the fabrication of Cu/SS304L composite micro channels Tribol. Int. (IF 6.2) Pub Date : 2024-03-06 Mengyuan Ren, Haibo Xie, Fei Lin, Hui Wu, Shengnan Yuan, Zhou Li, Ming Yang, Ken-ichi Manabe, Zhengyi Jiang
The different solution-processed concentrations of graphene solid lubricant (0 – 30 mg/mL) were applied on the surface of copper/stainless steel 304 L composite foils. A variable trend of rolling force occurs, with a first falling and then rising trend and the lowest rolling force was obtained at 25 mg/mL for 3.82 kN. Besides, the height of ridges and aspect ratio were improved with an increased solution-processed