Article
Chemistry, Physical
Baoqiang Hou, Haixia Guo, Nanlong Zhang, Qiang Zhi, Bo Wang, Jianfeng Yang
Summary: This study prepared and tested graphite flakes/copper composites with specific dihedral angles, showing an increase in friction coefficient with larger dihedral angles due to adhesion, and a decrease due to ploughing. The friction coefficients were lower at 30 to 60 degrees, and the wear rate decreased monotonically as the dihedral angle increased.
Article
Mechanics
T. Mace, J. Taylor, C. W. Schwingshackl
Summary: This study developed a new damping test procedure using modal strain energy technique, effective strain energy modeling, and accurate loss factor parameters to improve the prediction of material damping in composite laminate components.
COMPOSITE STRUCTURES
(2022)
Article
Chemistry, Physical
Cedric Kirst, Juan Ramos Zayas, Jan Singer
Summary: This work introduces two novel measurement methods for capturing the thermal behaviour of Li-ion cells in the frequency domain, which are validated by comparing them to the state of the art method. All experiments are conducted with a cylindrical 18650 LFP-Graphite cell and lead to similar thermal impedance spectra. A 0-D thermal model fitted to the respective measurement results is validated with a thermal step response in the time domain, showing accurate representation of the thermal behaviour with a mean absolute error below 0.3 K. The spider-web diagram classifies and compares the methods based on five values, demonstrating a 62% reduction in the state of the art thermal measurement time and an increase in impedance measurement resolution by measuring multiple frequencies simultaneously.
JOURNAL OF POWER SOURCES
(2023)
Article
Engineering, Multidisciplinary
Otavio A. Capeloto, Vitor S. Zanuto
Summary: In the study, the author utilized a mode-mismatched thermal lens technique and a model designed for continuous-wave excitation to fit experimental data, resulting in artificially obtained values for thermal diffusivity in fluid samples. However, it was analytically shown that the proposed model and corresponding thermal lens transient are not compatible with the theory of thermal diffusion.
Article
Materials Science, Ceramics
Qiang Gu, Yanxiang Zhang, Weikui Ma, Guoqi Liu, Xinhong Liu, Hongxia Li
Summary: The formation of MgAl2O4 at the interface between MgO-C and Al2O3-C in composite refractory materials decreases bonding strength, with the addition of MA in Al2O3-C reducing the material's properties after heat treatment. The study also found that the effects of interfacial mass transfer were not effectively mitigated by the addition of an interphase like MA.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Zhichao Wu, Shuangjian Li, Xiujuan Fan, Florian Vogel, Jie Mao, Xiaohui Tu
Summary: A robust self-lubricating coating was fabricated by in-situ synthesis of MoS2/C within inherent defects of thermally sprayed YSZ coatings. The hybrid coating exhibited excellent interfacial strength, increased hardness and cohesive strength. It also significantly reduced the coefficient of friction and specific wear rate at the frictional interface.
JOURNAL OF ADVANCED CERAMICS
(2023)
Article
Engineering, Mechanical
Hua Su, Chuding Zhang, Shan Sun
Summary: A Carbon/Carbon (C/C) composite material finger seal was proposed to reduce wear in high velocity, high temperature, and high pressure gas turbine conditions, with testing showing varying friction coefficients and wear rates under different conditions. A regression analysis model was established to predict wear rates based on load, speed, and temperature, with corrections made for high-speed operating conditions, verifying the wear rate calculation method for C/C composite finger seals.
Article
Multidisciplinary Sciences
B. M. Henson, J. A. Ross, K. F. Thomas, C. N. Kuhn, D. K. Shin, S. S. Hodgman, Yong-Hui Zhang, Li-Yan Tang, G. W. F. Drake, A. T. Bondy, A. G. Truscott, K. G. H. Baldwin
Summary: Despite being extensively tested, recent atomic spectroscopy measurements have revealed small discrepancies between experiment and theory in quantum electrodynamics (QED). This study focuses on the tune-out frequency of helium and compares experimental results with new theoretical QED calculations, resolving both QED contributions and retardation corrections.
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
Materials Science, Multidisciplinary
Liese Vandewalle, Milan J. Konstantinovic, Kim Verbeken, Tom Depover
Summary: This study analyzed the interaction between hydrogen and different microstructural defects in ultra-low carbon steel, with a specific focus on the influence of carbon distribution. The results showed that the trapping capacity of dislocations for hydrogen is significantly reduced after annealing at temperatures between 300 K and 600 K due to the dissolution of metastable kink-pairs and small carbon-vacancy clusters. Additionally, the presence of carbon reduces the vacancy mobility, resulting in the formation of strong hydrogen trapping sites during cold rolling.
Article
Materials Science, Coatings & Films
F. Venturi, A. Rincon Romero, T. Hussain
Summary: A novel setup for injecting liquid-based feedstock in a liquid-fuelled high velocity oxy-fuel (HVOLF) thermal spray torch is proposed in this study. The new setup uses a Hybrid Nozzle to inject suspension radially and protect the thermal spray flame from environmental oxygen. SiC/YAG composite coatings with 85 wt% SiC content were successfully deposited using this new setup, demonstrating good wear performance.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Carla S. P. Santos, Rebeca Cruz, Diogo B. Goncalves, Rafael Queiros, Mark Bloore, Zoltan Kovacs, Isabel Hoffmann, Susana Casal
Summary: A portable near infrared spectroscopy (NIRS) sensor combined with chemometrics was used to develop models for predicting citrus fruit ripeness and vitamin C content. The study successfully determined ascorbic acid, dehydroascorbic acid, and total vitamin C using HILIC-HPLC-UV, while also evaluating soluble solids and total acidity. The prediction models showed good to excellent performance, with oranges and Tahiti limes displaying particularly strong results.
JOURNAL OF AOAC INTERNATIONAL
(2021)
Article
Green & Sustainable Science & Technology
Siwen Wang, Lingzhi Tan, Tao Xu
Summary: This study found that the developed composite flame retardant (CFR) can effectively reduce the toxic volatile organic compounds (VOCs) and their release amounts during asphalt thermal decomposition. The CFR inhibits and retards the thermal decomposition progress of asphalt, leading to lower production of harmful compounds.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Multidisciplinary
Zhen Ma, Junjie Song, Hengzhong Fan, Tianchang Hu, Litian Hu
Summary: In this study, a composite lubrication structure was prepared on the surface of titanium alloy to improve the lubrication and anti-wear performance. The results showed that the introduction of texture and thermal oxidation layer further enhanced the longevity of the composite lubrication structure.
Article
Physics, Applied
Tianxun Gong, Wen Huang, Yuhao He, Yiwen He, Xiaosheng Zhang
Summary: A highly sensitive nanoscale mass sensor was developed using a suspended graphene structure to measure the weight of single microparticles. The sensor consists of an array of holes covered with suspended monolayer graphene. By measuring the shift of the 2D Raman peak in graphene, the mass of microparticles in the suspended graphene can be determined. The sensor successfully detects microparticles with masses ranging from 0.1 ng to 3 ng. The concept demonstrated in this study holds promise for nano-mass measurement applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Mechanics
K. Bonnay, V. Magnier, J. F. Brunel, P. Dufrenoy, G. De Saxce
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2015)
Article
Materials Science, Multidisciplinary
Fatima Eddoumy, Haytam Kasem, Houcine Dhieb, Josephus Gerardus Buijnsters, Philippe Dufrenoy, Jean-Pierre Celis, Yannick Desplanques
MATERIALS & DESIGN
(2015)
Article
Engineering, Mechanical
Yasser Aktir, Jean-Francois Brunel, Philippe Dufrenoy, Herve Mahe
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
(2016)
Article
Materials Science, Multidisciplinary
X. G. Wang, J. F. Witz, A. El Bartali, A. Oudriss, R. Seghir, P. Dufrenoy, X. Feaugas, E. Charkaluk
EXPERIMENTAL MECHANICS
(2016)
Article
Engineering, Mechanical
Pierre Baudoin, Vincent Magnier, Ahmed El Bartali, Jean-Francois Witz, Philippe Dufrenoy, Francois Demilly, Eric Charkaluk
INTERNATIONAL JOURNAL OF FATIGUE
(2016)
Article
Engineering, Mechanical
Y. Waddad, V. Magnier, P. Dufrenoy, G. De Saxce
TRIBOLOGY INTERNATIONAL
(2016)
Article
Engineering, Mechanical
V. Magnier, E. Roubin, J. B. Colliat, P. Dufrenoy
TRIBOLOGY INTERNATIONAL
(2017)
Article
Engineering, Mechanical
V. Magnier, D. Naidoo Ramasami, J. F. Brunel, P. Dufrenoy, T. Chancelier
TRIBOLOGY INTERNATIONAL
(2017)
Article
Engineering, Chemical
Yassine Waddad, Vincent Magnier, Philippe Dufrenoy, Gery De Saxce
Article
Engineering, Mechanical
Ruddy Mann, Vincent Magnier, Jean-Francois Brunel, Florent Brunel, Philippe Dufrenoy, Michele Henrion
Article
Engineering, Mechanical
Ruddy Mann, Vincent Magnier, Itziar Serrano-Munoz, Jean-Francois Brunel, Florent Brunel, Philippe Dufrenoy, Michele Henrion
MECHANICS & INDUSTRY
(2017)
Article
Materials Science, Multidisciplinary
Stephania Kossman, Alain Iost, Didier Chicot, David Mercier, Itziar Serrano-Munoz, Francine Roudet, Philippe Dufrenoy, Vincent Magnier, Anne-Lise Cristol
JOURNAL OF MATERIALS SCIENCE
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Itziar Serrano-Munoz, Vincent Magnier, Ruddy Mann, Philippe Dufrenoy
INTERNATIONAL DIGITAL IMAGING CORRELATION SOCIETY
(2017)
Article
Transportation Science & Technology
Philippe Dufrenoy, Vincent Magnier, Yassine Waddad, Jean-Francois Brunel, Gery De Saxce
SAE INTERNATIONAL JOURNAL OF PASSENGER CARS-MECHANICAL SYSTEMS
(2016)
Proceedings Paper
Engineering, Mechanical
Sofiane Saad, Vincent Magnier, Philippe Dufrenoy, Eric Charkaluk, Francois Demilly
Design and Modeling of Mechanical Systems - II
(2015)
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.