Article
Engineering, Mechanical
Ruixuan Wu, Chenfei Song, Haihong Wu, Bin Lv, Yanyan Zhang, Yongzhen Zhang
Summary: This study investigated the variation in the current-carrying tribological properties of Cu-C pairs and the related wear mechanism at different relative humidities. The results showed that the current-carrying coefficient of friction and contact resistance initially increased and then decreased, reaching maximum values at a relative humidity of 30%. Formation of a tribofilm and reduced abrasive wear were observed with an increase in humidity. The humidity-assisted carbon transfer increased the atomic percentage of C in the tribofilm. Even for an existing tribofilm, the coefficient of friction increased immediately once the humidity support was lost.
Article
Optics
Hui Yin, Jianping Peng, Xiang Zhang, Kang Tian, Yu Zhang, Jianqiang Guo
Summary: In this study, eddy current pulsed thermography was used for quantitative closed crack detection in railway defects. The method proved to be effective in measuring closed cracks, with simulation conclusions consistent with experimental results.
Article
Materials Science, Multidisciplinary
Matej Drobne, Urska Klancnik, Peter Fajfar, Milan Tercelj
Summary: Thermal fatigue tests were conducted to investigate the influence of oxidation behavior on the degradation progress of high chromium steel. The study found that oxidation plays a principal role in the degradation of the surface layer, with certain characteristics of eutectic carbides significantly accelerating the oxidation and degradation process.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Mechanical
Tianhua Chen, Chenfei Song, Yanyan Zhang, Kai Niu, Zili Liu, Li Wang, Chao Sun, Mengjia Li, Yongzhen Zhang
Summary: Novel current-carrying contact pairs were investigated in this study, where higher rotation speeds were found to increase total friction force and decrease contact resistance during the steady-state period. High rotation speeds and the presence of a current promoted surface fatigue and crack generation, while X-ray photoelectron spectroscopy results showed that more nascent metals were exposed on the rolling surface at higher speeds, benefiting electric contact. The weight of the elastic ring was significantly reduced compared to previous rigid rolling pairs, with no arcing occurring at high rotation speeds.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
S. Y. Zhang, Q. Y. Liu, W. J. Wang, M. Spiryagin, Q. Lin, H. H. Ding, Q. Wu, Z. R. Zhou
Summary: This study investigates the effect of water mediums on the evolution process of Rolling Contact Fatigue (RCF) behavior on defective rails. Results indicate that under water condition, the RCF behavior can be divided into four regions based on relative locations from surface defects, and the crack depths, densities and damage degrees first increase and then decrease with the progress of the tests. The ratio between the remained defect depth and the RCF crack depth determines whether the existence of defect influences the RCF behavior on the rail material.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Automation & Control Systems
Junzhen Zhu, Philip John Withers, Jianbo Wu, Feng Liu, Qiuji Yi, Zijun Wang, Gui Yun Tian
Summary: This study focuses on the application of eddy current pulsed thermography (ECPT) technology in detecting rolling contact fatigue (RCF) cracks in railway tracks. The results show that longer time slots and pulse durations can provide clearer characterization of cracks with different inclination angles, and area-based and kurtosis-based features are the most suitable and robust measures for evaluating real RCF cracks.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2021)
Article
Microbiology
Kevin P. Dillon, Valdis Krumins, Aishwarya Deshpande, Lee J. Kerkhof, Gediminas Mainelis, Donna E. Fennell
Summary: The growth and activity of methanotrophic bacteria in the air have been investigated in this study. Results showed that certain conditions can support their growth and synthesis of new DNA in the airborne state. Humidity and low biomass levels were found to be limiting factors for bacterial growth in the air. This study expands our knowledge about the potential activities and functions of bacteria in the atmospheric microbiome.
MICROBIOLOGY SPECTRUM
(2022)
Article
Engineering, Mechanical
Sabrina Vantadori, Andrea Zanichelli, Diego Erena
Summary: The research investigates the fatigue assessment of an Al 7075-T651 under fretting fatigue testing with cylindrical contact. Experimental observation shows a slight rolling of the pads, resulting in contact surface stresses different from the Hertzian stresses. Hence, a methodology proposed by the authors for evaluating the fatigue of fretting-affected metallic components is utilized for the first time in conjunction with a finite element numerical model to determine the crack nucleation orientation and lifetime of each specimen in the experimental campaign.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Polymer Science
Bowen Li, Jianzhong Chen, Yong Lv, Li Huang, Xiaoyu Zhang
Summary: The study investigated the mechanical behavior of carbon fiber reinforced epoxy composites in the fatigue process under different humidity conditions using MD simulation. The results showed that humidity weakened interfacial adhesive performance, increased free volume, and caused water molecules to diffuse into the epoxy resin. The distance between matrix and fiber increased in dry conditions but decreased in wet conditions, with the rate of performance degradation decreasing with higher humidity due to poor initial performance.
Review
Materials Science, Multidisciplinary
Xiaoyi Liu, Daniel Beysens, Tarik Bourouina
Summary: This paper reviews current and potential energetically passive procedures for improving atmospheric water harvesting capabilities, discussing their advantages, limitations, and water harvesting performance. It also demonstrates various applications and proposes a prospective concept for a multifunctional water vapor harvesting panel.
ACS MATERIALS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Jee-Hyun Kang, Jungwoong Kim, Jun-Yun Kang, Soon-Woo Kwon, Min-Woo Kang, Seung Hyun Hong
Summary: This study provides an in-depth characterization of the formation mechanism of the dark-etching region (DER) caused by rolling contact fatigue in bearing steel. The results reveal that the accumulation of plastic flow and dynamic recrystallization contribute to the hardness reduction and etching behavior, which may lead to spalling of the bearing.
Article
Chemistry, Physical
Cheng He, Ami C. Yang-Neyerlin, Bryan Pivovar
Summary: The role of membranes in determining water balance in AEMFCs is crucial but has been limitedly studied. This research presents a novel method for probing limiting current based on water flux, revealing water diffusion as a critical mechanism for achieving high current density performance and durability.
JOURNAL OF POWER SOURCES
(2022)
Article
Materials Science, Multidisciplinary
Yixiang Sun, Chenfei Song, Yanyan Zhang, Mengjia Li, Yongzhen Zhang
Summary: In this study, the oxidation of copper surface under current-carrying conditions was investigated using a disc-disc rolling tribometer with different oxygen contents. It was found that an increase in oxygen content promoted surface oxidation, leading to higher friction coefficient. Surfaces with higher oxidation degree exhibited better hydrophilicity, resulting in a higher friction coefficient due to additional meniscus force. Additionally, the material damage style shifted from adhesive wear to lamellar fatigue wear due to shear deformation induced by the high friction coefficient.
Article
Environmental Sciences
Dejun Liu, Tao Wang, Dongyan Shao, Huangwei Song, Weishuai Zhai, Chengtao Sun, Ying Zhang, Muchen Zhang, Yulin Fu, Rong Zhang, Tao He, Ziquan Lv, Li Bai, Congming Wu, Yuebin Ke, Yang Wang, Zhangqi Shen
Summary: This study analyzed the diversity of ISCR2 and tet(X4) from different sources, and the results showed that ISCR2 plays a critical role in the dissemination of tet(X4) and other resistance genes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Mechanical
Diego Erena, Vicente Martin, Jesus Vazquez, Carlos Navarro
Summary: This study conducts a detailed analysis of cracks in fretting fatigue tests with cylindrical contact, where a small oscillatory rolling of the contact pad is present. The contact area is found to be larger than the theoretical value predicted by Hertz's theory, indicating the occurrence of rolling of the contact pad due to contact geometry and test setup stiffness. A 2D numerical model is developed to reproduce this phenomenon, and the results are compared with actual crack profile measurements.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Chemistry, Multidisciplinary
Chenfei Song, Bingjun Yu, Mian Wang, Linmao Qian
Article
Multidisciplinary Sciences
Chenfei Song, Xiaoying Li, Hanshan Dong, Bingjun Yu, Zhiming Wang, Linmao Qian
SCIENTIFIC REPORTS
(2015)
Article
Chemistry, Physical
Yanyan Zhang, Yongzhen Zhang, Chenfei Song
Article
Nanoscience & Nanotechnology
Chenfei Song, Bingjun Yu, Linmao Qian
MICRO & NANO LETTERS
(2013)
Article
Nanoscience & Nanotechnology
Jian Guo, Chenfei Song, Xiaoying Li, Bingjun Yu, Hanshan Dong, Linmao Qian, Zhongrong Zhou
NANOSCALE RESEARCH LETTERS
(2012)
Article
Nanoscience & Nanotechnology
Chenfei Song, Xiaoying Li, Shuxun Cui, Hanshan Dong, Bingjun Yu, Linmao Qian
NANOSCALE RESEARCH LETTERS
(2013)
Article
Nanoscience & Nanotechnology
Peng Tang, Bingjun Yu, Jian Guo, Chenfei Song, Linmao Qian
NANOSCALE RESEARCH LETTERS
(2014)
Article
Chemistry, Physical
Hongxin Shi, Sanming Du, Chao Sun, Chenfei Song, Zhenghai Yang, Yongzhen Zhang
Article
Engineering, Mechanical
Yulong Xie, Chao Sun, Yongzhen Zhang, Hongxin Shi, Chenfei Song, Sanming Du
TRIBOLOGY TRANSACTIONS
(2019)
Article
Engineering, Mechanical
Yanyan Zhang, Conghui Li, Xianjuan Pang, Chenfei Song, Feng Ni, Yongzhen Zhang
Summary: The dynamic study of the pantograph/catenary system on SS7 electric locomotive in China found that the contact force between pantograph and contact wire vibrated periodically with running trains, and increased in amplitude and frequency with higher running speeds. The effects of dynamic contact force on tribological properties of the pure carbon strip were studied, revealing a critical point of friction coefficient, wear rate, and current-carrying quality at a velocity of 80 km/h. The study also showed that the wear mechanism transferred from mechanical wear to arc erosion with the increase of arcing rate, which proved to be the most important failure types for pure carbon strip.
Article
Engineering, Mechanical
Tianhua Chen, Chenfei Song, Yanyan Zhang, Kai Niu, Zili Liu, Li Wang, Chao Sun, Mengjia Li, Yongzhen Zhang
Summary: Novel current-carrying contact pairs were investigated in this study, where higher rotation speeds were found to increase total friction force and decrease contact resistance during the steady-state period. High rotation speeds and the presence of a current promoted surface fatigue and crack generation, while X-ray photoelectron spectroscopy results showed that more nascent metals were exposed on the rolling surface at higher speeds, benefiting electric contact. The weight of the elastic ring was significantly reduced compared to previous rigid rolling pairs, with no arcing occurring at high rotation speeds.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
Fei Lu, Jian Liu, Xianjuan Pang, Chenfei Song, Zhidong Xu
Summary: Due to high-speed and high-pressure operating conditions, wear between the finger seal and the rotor is unavoidable, affecting the seal life. Anisotropic elasticity theory was used to describe the mechanical characteristics of the seal material. An improved Archard wear model was proposed to calculate the wear rate and determine the wear direction. By studying the effects of various factors, such as material density, fabric orientation, pressure differential, and rotor speed, on wear characteristics and leakage clearance, it was found that C/C composite finger seals with higher material density exhibited smaller leakage clearance and wear depth. Increasing the fabric orientation angle reduced wear depth in the heel area and narrowed the circumferential wear area. This study provides a theoretical basis for predicting and evaluating the wear life and performance of C/C composite finger seals.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2023)
Article
Engineering, Mechanical
Tianhua Chen, Chenfei Song, Zili Liu, Li Wang, Chao Sun, Xianjuan Pang, Yongzhen Zhang
Summary: A novel rotating conductive joint with an inner raceway, outer raceway, and elastic ring was proposed. The effects of elastic force on current-carrying properties and ring material damage were investigated. Increasing elastic force reduced frictional force and contact resistance, decreased slip-rolling ratio, and resulted in a low friction coefficient. High friction-induced plastic deformation did not cause wear at low elastic forces.
TRIBOLOGY TRANSACTIONS
(2023)
Article
Engineering, Electrical & Electronic
Fei Lu, Liang Lu, Jian Liu, Xianjuan Pang, Chenfei Song
Summary: The application of C/C composites in finger seals is a solution to the problem of seal wear due to its excellent tribological and mechanical behaviors. The designable characteristics of composites, such as density and orientation, greatly influence the tribological properties and service life of sealing materials. A study was conducted using a reciprocating tribo-tester to investigate the effects of material density, fabric orientation, load, and sliding velocity on the tribological properties and wear mechanism of the C/C composite. The results show that perpendicular orientation and higher density provide better tribological properties and lower wear rates.
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.
