Article
Engineering, Multidisciplinary
Conglin Dong, Yanyan Yang, Chengqing Yuan, Xiuqing Bai, Zhiwei Guo
Summary: The anisotropy of lignum vitae wood significantly affects its wear behavior, with fibers along the cell fiber direction exhibiting good tensile strength while fibers perpendicular to the cell fiber direction are easily damaged.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Mechanical
M. Wodtke, W. Litwin
Summary: The research focuses on thermal phenomena related to the operation of a water-lubricated stern tube bearing with axial grooves. Experimental tests showed that the intensity of forced axial flow significantly affects the bush temperature. Numerical simulations revealed that restricted axial flow leads to backflow of water through the grooves, resulting in a higher backflow temperature than the supply temperature and an increase in bearing bush temperature.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Qiren Huang, Zhiwei Guo, Zumin Wu, Enchi Xue, Xuefei Li, Chengqing Yuan
Summary: A novel bionic polymer was manufactured based on the arrangement, size, and density of Lignum vitae's vessel. The experimental results showed a positive correlation between the tribological performance of Lignum vitae and the size and density of its vessel. This finding reveals the more direct relation between the internal structure and tribological properties of Lignum vitae and provides mechanisms for its excellence in water-lubricated conditions.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Tao He, Zhongliang Xie, Xin Tao, Kang Yang, Jian Jiao, Minli Huang, Wensheng Ma
Summary: This study proposes a water-lubricated stern bearing with self-adaptation capacity for load equalization and vibration reduction. By using elastic elements and damping alloy, the bearing can improve the service life and reduce vibration response.
Article
Materials Science, Multidisciplinary
Manish Kumar, Rajnesh Tyagi
Summary: This study investigates the effect of density, shape of dimples, and sliding speed on the tribological performance of laser textured bearing steel under single drop lubrication. The results suggest that a lower density of bi-triangular dimples performed better in terms of reduced coefficient of friction and wear rate as compared to circular dimples or bi-triangular dimples with 20% density.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Characterization & Testing
Yuhang Wu, Conglin Dong, Xiuqin Bai, Chengqing Yuan, Xiangjun Zhang
Summary: The study found that lignum vitae chips can improve the properties of thermoplastic polyurethane, such as hardness and elastic modulus, and reduce the coefficient of friction and wear. However, adding an excessive amount of lignum vitae chips leads to a decrease in material elasticity and elongation, and an increase in the coefficient of friction and wear.
Article
Engineering, Mechanical
M. Conradi, A. Kocijan, D. Klobcar, B. Podgornik
Summary: The study found that under different sliding conditions, dimples defined by nanosecond laser exhibited the lowest steady-state coefficient of friction, while in Hank's solution, lines and crosshatching showed better frictional characteristics after running-in and the removal of bulges around the laser textures. In terms of wear resistance, low-density lines pattern and particularly dimples were the most promising in contact situations likely to occur during starved/dry-lubrication conditions.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Shengkang Dong, Zhiwei Guo, Hongshuang Zang, Chengqing Yuan
Summary: In this study, the tribological properties of polytetrafluoroethylene (PTFE) water-lubricated composites were investigated with different silicon carbide (SiC) content and particle size. The results showed that the wear resistance of PTFE composites can be significantly improved with a filling amount of 3-5 wt.% SiC particles. The composites with 5 wt.% SiC reduced wear loss by 99.44%. The friction and wear properties of the composites decreased as SiC particle size increased, and the wear mechanism shifted from adhesive to abrasive. The PTFE composites filled with 40 nm SiC particles exhibited the best wear resistance. This study provides an experimental basis for the development of high-performance PTFE water-lubricated bearings.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Mechanics
Zhiqiang Wang, Zhangxiang Dai, Shaofeng Wu, Ben Zhang, Jiangtao Cao, Rihong Ye
Summary: This study investigates the tribological properties of a seawater-lubricated friction pair by examining the influence of cavitation and multi-scale texture on load-carrying capacity. A numerical simulation method is proposed to reveal the mechanism of cavitation's impact on load-carrying capacity, and the results are validated through experiments. The findings show that cavitation, wedge action, and vortex flow effect are the main mechanisms affecting load-carrying capacity, and cavitation's effect varies with velocity. The study also reveals the impact of different surface textures, with millimeter-scale texture exhibiting the highest load-carrying capacity.
Article
Engineering, Mechanical
Pravin P. Patil, Yatika Gori, Ashwani Kumar, M. R. Tyagi
Summary: This research work examined the tribological performance of Polyisobutylene (PIB) as a viscosity index improver under boundary/mixed and hydrodynamic lubricated conditions. The study found that a 15% concentration of PIB blend significantly reduced wear and friction, but higher concentrations showed an increase in friction.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Zhibin Lin, Ke Zhang, Peng Tao, Bingzhao Gao, Xiaogang Zhao, Xuemei Zong, Zhikai Chen, Zhihui Zhang
Summary: The hybrid wear system consisting of independent PEEK and PTFE components sliding against steel can improve the tribological performance of PEEK without compromising its mechanical properties. The roughness of the countersurface has a significant impact on the formation of tribofilms and the overall tribological performance of the hybrid wear system.
Article
Engineering, Mechanical
Ramana Reddy Annadi, Ismail Syed
Summary: Single-scale textured sliding contacts are effective for low-load and high-speed conditions. However, most machine-driven components operate under dynamic load and speed conditions. Therefore, multi-scale textures are devised to counteract the dynamic operating conditions. This study fabricates multi-scale textured surfaces using Nd: YAG laser and analyzes their effect on tribological parameters. The results show that an area density of 0.3 and a texture depth of 10 μm exhibit better tribological properties in most loading conditions.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Zhongliang Xie, Weidong Zhu
Summary: The paper investigates the micro asperity contact load ratios and lubrication states of water-lubricated bearings. New coupled models are proposed to consider the micro-scale effects of asperity contact. The study establishes the relevance of load ratio with transition of lubrication regimes under various structural parameters and operating conditions, revealing the mechanism of regimes transition at the micro level. Experimental measurements verify the correctness of the revised model.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Chemical
K. Bobzin, C. Kalscheuer, M. Thiex, P. Sperka, M. Hartl, S. Reitschuster, E. Maier, T. Lohner, K. Stahl
Summary: The purpose of this study was to improve the wear resistance of polymers in highly stressed tribological contacts by developing and depositing diamond-like carbon (DLC) coatings on polymers. The coatings showed the ability to undergo high plastic deformations without delamination and the possibility of forming a composite layer under dry conditions. Additionally, changes in sp(2) chain and sp(2) cluster size and distribution were observed during dry contact conditions.
Article
Engineering, Mechanical
Shahid Manzoor Wani, Babar Ahmad, Sheikh Shahid Saleem
Summary: In this study, Ni-Co-BN coatings were deposited on Aluminium-Silicon using the PVD technique and their composition and morphology were investigated. Mechanical and nano-wear studies were conducted to understand the effect of load on reduced modulus, hardness, and wear rate of the coating. The results showed a decrease in reduced modulus and hardness with increasing load, while the wear rate increased. The smooth wear scars on the coated material suggested its suitability for bearing applications.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Shaoli Jiang, Chengqing Yuan, Zhiwei Guo, Xiuqin Bai
TRIBOLOGY INTERNATIONAL
(2019)
Article
Engineering, Mechanical
Xiang Rao, Chenxing Sheng, Zhiwei Guo, Chengqing Yuan
TRIBOLOGY TRANSACTIONS
(2019)
Article
Chemistry, Applied
Ke Li, Xiao Zhang, Chen Du, Jinwan Yang, Bolang Wu, Zhiwei Guo, Conglin Dong, Ning Lin, Chengqing Yuan
CARBOHYDRATE POLYMERS
(2019)
Article
Engineering, Mechanical
Jiazhi Miao, Yongqing Li, Xiang Rao, Libao Zhu, Zhiwei Guo, Chengqing Yuan
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2020)
Article
Engineering, Mechanical
Zongrong Yang, Zhiwei Guo, Chengqing Yuan
Article
Engineering, Mechanical
Chao Zhen Yang, Zhiwei Guo, Changkun Xu
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2020)
Article
Polymer Science
Chaobao Wang, Xiuqin Bai, Conglin Dong, Zhiwei Guo, Chengqing Yuan
Article
Materials Science, Characterization & Testing
Xiang Liang, Zhiwei Guo, Tian Jun, Chengqing Yuan
Article
Engineering, Mechanical
Xiang Rao, Chenxing Sheng, Zhiwei Guo
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2019)
Article
Polymer Science
Zumin Wu, Zhiwei Guo, Chengqing Yuan
Summary: Polyetheretherketone (PEEK) shows good performance as a water-lubricated bearing material and has application potential. The wear behavior and friction coefficient can evaluate the water lubrication performance of PEEK. Water film can form effectively at high sliding velocity, while transfer film can form at low sliding velocity.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Materials Science, Composites
Xin Xie, Zhiwei Guo, Chengqing Yuan
POLYMER COMPOSITES
(2020)
Article
Polymer Science
Xiang Liang, Zhiwei Guo, Jun Tian, Chengqing Yuan
POLYMERS FOR ADVANCED TECHNOLOGIES
(2020)
Article
Engineering, Mechanical
Zhenxiang Yang, Zhiwei Guo, Zongrong Yang, Chaobao Wang, Chengqing Yuan
Summary: This study explored the use of micro-encapsulated lubricants to improve the tribological properties of water-lubricated bearings. The addition of microcapsules to UHMWPE effectively reduced friction coefficient, wear loss, and optimized the wear surface morphology of the composites.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Marine
Zhongzhi Liu, Zhiwei Guo, Yongqing Li, Libao Zhu, Chengqing Yuan
Summary: This paper presents an improved failure risk assessment method for a large luxury cruise ship's bilge system under fire accident conditions, incorporating an expert weight calculation model and a risk coefficient calculation model. Sensitivity analysis is conducted to study the effects of these models on the method's performance. Empirical study results demonstrate the method's effectiveness in minimizing issues encountered with traditional methods and providing practical design guidelines.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Mechanical
Chang Du, Chenxing Sheng, Xingxin Liang, Xiang Rao, Zhiwei Guo
Summary: As an important friction pair in a diesel engine, the cylinder-liner piston ring (CL-PR) operates in a challenging high-temperature environment. In order to understand the relationship between the friction performance of the CL-PR and temperature changes, a reciprocating-friction and wear-testing machine was used to analyze the friction and lubrication performance of four different lubricating oils at various temperatures (room temperature, 60 degrees C, 90 degrees C, and 120 degrees C) based on friction coefficient, contact resistance, and surface topography. The results show that the tribological properties of the lubricating oils exhibit different trends as temperature increases. The friction coefficient of the base oil initially decreases and then increases with temperature, indicating improved friction performance due to a certain temperature rise, as well as the promotion of oxide film formation and reduction in friction coefficient with temperature. On the other hand, the friction coefficient of the other three lubricating oils initially increases and then stabilizes, with the most severe wear observed at 120 degrees C in the form of abrasive wear and adhesive wear.
Article
Engineering, Mechanical
Yankui Song, Ke Xiao, Guo Xiang
Summary: The novelty of this study lies in constructing an Entropy-based wear and fluid-solid-thermal (FST) coupled model for journal bearings, and revealing the transient interaction behavior between wear evolution and FST evolution during repeated starting and stopping. The wear rate is measured experimentally, and the contact temperature, friction coefficient and normal contact force are obtained from the validated FST model. Wear tests and numerical calculations are conducted to validate the predicted wear rate and investigate the time-varying wear and FST evolution of journal bearings.
Article
Engineering, Mechanical
Xin-long Liu, Xin Guan, Yuan Zhong, Qian Xiao, Yong Cao, Wu-lue Zhang, Song Zhang, Yi-ting Zheng, Ming-sheng Gao, Dao-yun Chen, Wen-bin Yang
Summary: Gaps in the conductor rail joints of intercity trains have an impact on current transmission and the wear of carbon skateboards. These gaps decrease the coefficient of friction, increase electrical contact resistance, and affect the wear rate of carbon skateboards.
Article
Engineering, Mechanical
Yuhang Wu, Conglin Dong, Xiuqin Bai, Chengqing Yuan
Summary: The study developed a new composite material by incorporating hexagonal boron nitride (h-BN) particles into a thermoplastic polyurethane (TPU) matrix, which exhibited excellent self-lubricating properties and reduced frictional excitation forces. The addition of h-BN particles effectively reduced the coefficient of friction, decreased fluctuation amplitude, enhanced wear resistance, and attenuated vibration behaviors.
Article
Engineering, Mechanical
Tiancheng Ouyang, Xiuyang Sun, Wentao Tang, Yinxuan Li, Zhi Qun Tian, Yanzhou Li
Summary: By adding nitrogen-doped graphene and C60 nanoparticles to the lubricant, a highly efficient nano-lubricant with vibration and noise reduction properties is synthesized.
Article
Engineering, Mechanical
Xin Zhuo, Jun Cao, Haibo Huang, Li Liu, Xinkun Suo, Peiqing Ye, Zeshan Abbas
Summary: A polymer coating prepared by liquid spraying technology on the surface of 20CrMo steel demonstrates good tribological and anti-cavitation erosive properties. It can effectively replace CuPb24Sn copper alloy in valve plates for pumps under different lubrication conditions. The coating exhibits adhesive wear and reduces frictional loss, and mainly shows abrasive wear under complex working conditions. Its lipophilicity, high hardness to elastic modulus ratio, and corrosion resistance are the main influencing factors for its performance.
Article
Engineering, Mechanical
Md. Aminul Islam, Jiaren (Jimmy) Jiang, Yongsong Xie
Summary: Erosion-corrosion is a major factor in material loss and reduced useful life of hydro-transport equipment. This study evaluates the erosion-corrosion characteristics of different materials and finds that matrix wear affects the degradation of carbides. Sufficient wear and corrosion resistance in the surrounding matrix are important for good erosion-corrosion resistance.
Article
Engineering, Mechanical
Andre Dubois, Oussama Filali, Laurent Dubar
Summary: This study investigates the effect of surface roughness, contact pressure, and lubrication on the onset of galling in aluminum 6082-T6 using a pin-on-plate tribometer. The experimental results show that the roughness and lubricants play a significant role in preventing galling.
Article
Engineering, Mechanical
Jizhan Wu, Peitang Wei, Guoqiang Liu, Difa Chen, Xiuhua Zhang, Taimin Chen, Huaiju Liu
Summary: This study conducted a comprehensive evaluation of the DLC coating treatment on the loading capacity of gears and characterized the surface features and fatigue performance. The results demonstrate that DLC coating significantly improves the hardness and surface residual compressive stress of the gears, as well as enhances their contact fatigue performance.
Article
Engineering, Mechanical
Yangping Liu, Hwaran Lee, Annsley Mace, Jeremy L. Gilbert
Summary: An AFM-based single asperity tribology method was used to investigate the wear performance of carbides and base metal matrix in high carbon CoCrMo alloy. The wear behavior of the two types of carbides was stress-dependent and influenced by chemical composition. Cr-rich carbides exhibited higher wear resistance compared to Mo-rich carbides.
Article
Engineering, Mechanical
Zdenek Riha, Michal Zelenak, Akash Nag, Jakub Poloprudsky, Tomas Kruml, Sergej Hloch
Summary: This study investigates the erosion performances of a high-speed modulated jet (MWJ) and continuous water jet (CWJ). By comparing different nozzles and water jet powers, the effects of modulated and continuous jets on aluminum alloy were studied. The results show that under certain conditions, modulated jet can create deeper and sharper grooves while reducing the impact of lateral flow.
Article
Engineering, Mechanical
Chunyu Yu, Weipu Li, Yang Guo, Xianbin Sun, Fanli Hong, Ning Sun, Qinghai Zhang
Summary: This study explores the relationship between the wear rate of train brake pads and its features, and proposes a method for predicting the wear rate suitable for small sample data. Grey relational analysis and Pearson correlation analysis are used to determine the preferred features that affect the wear rate, and a BOA-BP model is established for prediction. The results show that BOA-BP exhibits better advantages in prediction with small samples.
Article
Engineering, Mechanical
Shan Yin, Xin Zhao, Shuangchao Huang, Zefeng Wen, Xuesong Jin
Summary: This study simulated the rolling contact of a driving wheelset over tangent and curved tracks at a speed up to 500 km/h using an explicit finite element approach to derive creep curves. The comparison between quasi-steady curves and transient curves in the presence of rail corrugation helped to identify cases where traditional theories are inapplicable and where transient effects must be considered. Additionally, the study further analyzed the influence of middle/high-frequency vibrations in the presence of rail corrugation.
Article
Engineering, Mechanical
Jiyao Zhang, Yuanlie Yu, Junlei Tang, Yingying Wang, Honggang Sun, Kaikai Song, Jianhong Gong, Pingping Liu, Xiaoming Liu, Lina Hu, Parthiban Ramasamy, Juergen Eckert
Summary: The influence of high-carbon addition on the microstructure, hardness, and wear behavior of CoCrNi alloy was investigated. It was found that the addition of carbon resulted in the formation of carbide particles, enhancing the hardness and improving the wear resistance. Fracture and detachment of hard carbides during friction introduced additional abrasive particles, transitioning the wear mechanism from adhesive-dominated to abrasive-dominated.
Article
Engineering, Mechanical
Yanfei Liu, Shengtao Yu, Ruize Zhang, Xiangyu Ge, Wenzhong Wang
Summary: This study reports the tribological behavior of nanodiamond plate (NDPL) as a nanoadditive for the first time and compares it with nanodiamond particles (NDPA). The results show that NDPL provides better lubrication performance at higher concentrations, and the sliding between NDPLs and the structural transformation from sp3 to sp2 carbon play a crucial role in lubrication and wear resistance.
