Article
Engineering, Mechanical
Jongsung Park, Byungsoo Joo, Hyungjo Seo, Wansu Song, Jung Ju Lee, Wan Kyu Lee, Ho Jang
Summary: Brake emissions from commercial brake pads were investigated to understand the mechanism of airborne particle generation. The emission factor and particle number concentration were found to be significantly different between low-steel and non-steel brake pads. The size distribution of particles was influenced by the surface topography of the brake pads.
Article
Engineering, Mechanical
Jongsung Park, Wansu Song, Jaehyun Gweon, Hyungjo Seo, Jung Ju Lee, Ho Jang
Summary: The study found that the size of zircon particles in brake pads significantly affects the concentration, size distribution, and composition of particulate matter (PM) emitted during brake application. Different sizes of zircon particles lead to variations in iron content in the brake-induced PM.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Bhaskaranand Bhatt, Navnath Kalel, Ashish Darpe, Jayashree Bijwe
Summary: This study evaluated the noise and vibration performance of pads based on PD compared to non-PD based ones, finding that increasing the PD content significantly improves brake NV performance. Pads with 20 wt.% PD performed best in both noise and vibration aspects, indicating that 20 wt.% PD can be used to enhance the NV performance of brake pads and increase friction levels.
Article
Materials Science, Composites
Naresh Kumar, J. S. Grewal, Avtar Singh, Vikas Mehta
Summary: Research studies have recently highlighted the increasing importance of natural fiber in modern applications due to its eco-friendly behavior and excellent mechanical properties. The use of date palm fiber as a replacement for harmful materials in brake friction material has shown promising results. Studies comparing natural fiber-based composites with actual brake friction material have been limited, with date palm fiber composites showing superior results at 5% composition.
POLYMER COMPOSITES
(2022)
Article
Engineering, Mechanical
Yang Hui, Guimin Liu, Qing Zhang, Yong Zhang, Yan Zang, Sijie Wang, Ruidong Shi
Summary: This study investigated the performance of C/C-SiC brake discs under extreme conditions and revealed the friction interface evolution and anti-fading mechanism of the discs. The results showed that the C/C-SiC brake discs performed well at high temperatures, with a high maximum temperature and low decay rate. Compared to iron-based brake discs, the C/C-SiC discs had increased friction coefficient and decreased wear rate. The formation of a continuous friction film during braking contributed to the excellent performance of the discs. Additionally, the C/C-SiC brake discs exhibited stable and sufficient braking force during emergency braking.
Article
Materials Science, Multidisciplinary
Vlastimil Matejka, Mara Leonardi, Petr Praus, Giovanni Straffelini, Stefano Gialanella
Summary: This study evaluated the role of graphitic carbon nitride (gCN) in friction composites for brake pad manufacturing and found that its main function is as a soft abrasive.
Article
Materials Science, Composites
Naresh Kumar, Sushil Kumar, Jasmaninder Singh Grewal, Vikas Mehta, Sarafat Ali
Summary: This study aims to find a substitute for asbestos and synthetic fibers in brake friction materials by comparing Abaca and Kevlar fibers. The results show that increasing the percentage of Abaca and Kevlar fibers in the composite can improve certain properties but decrease others. Kevlar-based composites exhibit slightly better performance in some aspects compared to Abaca-based composites.
POLYMER COMPOSITES
(2022)
Article
Engineering, Mechanical
Wansu Song, Jaehyun Gweon, Jongsung Park, Sung-Uk Kwon, Jung Ju Lee, Yun Cheol Kim, Ho Jang
Summary: This study investigates the correlation between the type of abrasive in the brake friction composite and the emission produced during braking. The findings suggest that the abrasivity of the particles strongly affects disc wear and airborne particle emission, while pad wear is more influenced by the strength of the friction film. The fracture toughness of the abrasives significantly impacts disc wear rate and mass concentration of airborne wear particles.
Article
Engineering, Mechanical
Guang He, Anxia Pan, Chuangang Wang, Zhong Ouyang, Xiaodong Xu, Peng Jiang, Yi Zhang, Haozhe Jin, Wangping Wu
Summary: In this study, X-10 type brake discs for urban rail vehicles were inspected using fluorescent magnetic particle testing. The causes of failure for the brake discs were analyzed through various characterization techniques such as X-ray energy dispersive spectrometry, metallographic microscope, scanning electron microscopy, and material-testing machine. Numerical simulation, braking dynamic tests, and fatigue tests were utilized to analyze stress, crack propagation, and residual fatigue life. The failure reason of the brake disc was determined to be the occurrence of fatigue crack at the root of the connecting claw, originating from exposed graphite sheets on the surface of the cast iron matrix. The results showed that thermal stress on the graphite sheets promoted crack expansion along their path. Stability propagation of the crack was observed in braking force and fatigue tests. Finally, suggestions and prevention measures for brake discs were provided.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Multidisciplinary Sciences
J. Samsing, I Bartos, D. J. D'Orazio, Z. Haiman, B. Kocsis, N. W. C. Leigh, B. Liu, M. E. Pessah, H. Tagawa
Summary: New research has found that black hole mergers in active galactic nuclei disk environments can result in an excess of eccentric mergers compared to circular mergers. This phenomenon may be due to frequent interactions between single and binary black holes, as well as small mutual inclinations.
Article
Chemistry, Multidisciplinary
Hongyuan Zhang, Jiayu Qiao, Xin Zhang
Summary: This study establishes a six-degree-of-freedom nonlinear dynamics model to investigate the vibration characteristics during brake friction. The results show that brake pressure, braking speed, and the support stiffness of brake pad and disc all have an impact on the vibration characteristics.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Vishal Ahlawat, Ujjawal Yadav, Sunil Nain, Tej Singh
Summary: The study showed that white ark shell powder can be a potential filler in brake friction materials, offering lower friction coefficient and higher wear resistance while reducing noise and vibrations.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Engineering, Mechanical
Jinnan Wang, Muhammad Qasim Zafar, Yunbo Chen, Peng Pan, Lingli Zuo, Haiyan Zhao, Xiangjun Zhang
Summary: This study investigated the tribological properties of a newly developed brake disc material BD-1 and compared it with an existing commercial brake disc material BD-2. The results showed that BD-1 exhibited good friction and wear performance under emergency braking conditions of high-speed trains, indicating its potential application in high-speed railways.
Article
Materials Science, Composites
Vishal Ahlawat, Praveen Tewatia, Sunil Nain, Raj Kumar, Sunil Kumar, Tej Singh
Summary: This study compared the thermal and tribological properties of different graphene/graphite content in graphene-filled flyash and banana fiber reinforced brake friction composites. The results showed that the thermal stability of graphite lubricated composites was higher but decreased with increased graphite/graphene loading. The graphene-filled composite exhibited better friction performance and enhanced wear resistance at lower sliding velocity conditions.
POLYMER COMPOSITES
(2022)
Article
Engineering, Mechanical
Fabian Limmer, Peter C. Brooks, Carl Gilkeson, Shahriar Kosarieh, David C. Barton
Summary: This study investigates the pv-value, a common parameter used to describe the energy input in friction pairings. The impacts of different combinations of sliding speed (v) and contact pressure (p) were examined while keeping the pv-value constant. Tests were conducted on a small-scale test bench using steady-state drag braking applications. The study found that the tribological interface was sensitive to sliding and loading conditions, with a shift in oxidizing states of the iron contents. The results showed that the oxidizing states dynamically react to operating conditions, but changes in the actual contact area and thermal response of the friction couple can alter the overall frictional performance of the system due to the transition in oxidizing states.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Yao Ning, Fuhai Liu, Liping Ran, Ke Peng, Yicheng Ge, Maozhong Yi
Summary: This study compared the oxidation behavior of C/C-BN composites and C-f/BN/PyC composites with different structures for pyrolytic carbon (PyC) and boron nitride (BN). The C/C-BN composites showed a different pore structure due to the formation of nodules comprising h-BN particles, resulting in higher oxidation resistance and larger activation energy. The oxidation mechanism was more dependent on pore structure than on BN structure or content.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Fuhai Liu, Maozhong Yi, Liping Ran, Yicheng Ge, Zhe Zhou, Ke Peng
Summary: In this study, C/C-BN-SiC composite materials with various h-BN/SiC ratios were investigated for their kinetic characteristics and oxidation behavior in the temperature range of 600 to 1300 degrees Celsius. The optimal h-BN/SiC ratio demonstrated a balance between thermal stability and fluidity, providing high thermal stability, low oxygen permeability, and the ability to seal defects as an oxygen diffusion barrier.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Zhenxiao Tang, Maozhong Yi, Yuanming Zhou, Ruizhi Liu, Ke Peng
Summary: High-temperature heat treatment improved the flexural strength of C/C-SiC composites, but led to a decrease in fracture toughness.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Zhenxiao Tang, Maozhong Yi, Qiuling Xiang, Yuhui Du, Ke Peng
Summary: An improved high-solid-loading slurry impregnation process was developed to efficiently introduce HfB2 particles into a low-density C/C preform, followed by precursor infiltration and pyrolysis process for densification to obtain a C/C-HfB2-SiC composite. Microstructure characterization showed uniform distribution of HfB2 particles and good densification of the composite material, resulting in improved bending strength and non-brittle fracture behavior.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Zhenxiao Tang, Maozhong Yi, Huan Yin, Yuhui Du, Huang Wu, Ke Peng
Summary: A C/C-ZrC-SiC composite with excellent ablation properties was successfully prepared by high-solid-loading slurry impregnation combined with polymer infiltration and pyrolysis. The excellent performance of the composite is attributed to the protection of the matrix by a three-layered oxide scale consisting of ZrO2/SiO2-rich/ZrO2-SiO2.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Zhenxiao Tang, Maozhong Yi, Huang Wu, Yuanming Zhou, Ruizhi Liu, Jie Jiang, Ke Peng
Summary: In this study, a SiC coating was successfully prepared on a C/C-SiC composite using slurry painting combined with a chemical vapor reaction process to enhance its oxidation resistance. The presence of residual silicon in the coating promoted the formation of a complete SiO2 glass layer in the initial oxidation stage, but also accelerated the failure of the coating. However, due to the presence of a large number of SiC ceramics in the composite, the oxidation weight loss rate of the coating sample after coating failure was reduced.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Lei Zhai, Lingxiao Gao, Ziying Wang, Kejie Dai, Shuai Wu, Xiaojing Mu
Summary: This study presents an energy harvester based on a triboelectric mechanism and electrostatic mechanism for biomechanical energy harvesting. By coupling the electrostatic induction mechanisms, the device greatly improved its output performance, achieving a 46-fold enhancement in peak power compared to a conventional single triboelectric conversion mechanism. The device also showed higher resolution for motion states and the ability to charge a capacitor and light up LED lights.
Review
Chemistry, Multidisciplinary
Chao Wang, Cuihua An, Chunling Qin, Hassanien Gomaa, Qibo Deng, Shuai Wu, Ning Hu
Summary: This review summarizes the recent progress in noble metal-based core-shell catalysts for oxygen reduction reactions in proton exchange membrane fuel cells. It highlights the effects of preparation methods, temperature, doping elements, and shell layers on the catalyst performance. The difficulties of mass production and high cost of these catalysts are also discussed. The review proposes research directions for the development of high-performance catalysts with simple synthesis and low cost.
Article
Chemistry, Physical
Cuihua An, Yuchen Wang, Penggang Jiao, Shuai Wu, Lingxiao Gao, Chunyou Zhu, Junsheng Li, Ning Hu
Summary: Increasing attention is being paid to the development and utilization of hydrogen energy due to rising energy consumption and environmental pollution. However, the sluggish kinetics of the hydrogen evolution reaction (HER) requires the design and fabrication of catalysts to decrease the overpotential. In this study, a Ni5P4 catalyst was prepared and doped with Se powder, leading to enhanced electrochemical performance. The Ni5P4-Se catalyst exhibited excellent HER catalytic activity and cycling stability.
Article
Chemistry, Physical
Cuihua An, Yuchen Wang, Rui Huang, Yueqing Li, Chao Wang, Shuai Wu, Lingxiao Gao, Chunyou Zhu, Qibo Deng, Ning Hu
Summary: The research and development of efficient electrocatalysts for the hydrogen evolution reaction (HER) are crucial for the widespread use of hydrogen energy. This study demonstrated a preparation method of lattice-matched Cu3P/Cu2Se heterojunction catalysts via anodic oxidation, phosphorization, and selenization. The synergistic effect of the two phases and heterogeneous interface significantly improved the electrochemical HER performance, with a lower overpotential and better stability compared to individual Cu3P and Cu2Se catalysts.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Multidisciplinary
Zhen-xiao Tang, Mao-zhong Yi, Yuan-ming Zhou, Rui-zhi Liu, Ke Peng
Summary: A three-dimensional orthogonal woven C/C-SiC composite was prepared by slurry impregnation, precursor infiltration, and pyrolysis. The composite exhibited excellent mechanical properties and ablation performance. The passive oxidation of SiC and pitting caused by SiO2 contributed to the good ablation performance.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Anshuo Xu, Qun Zu, Shuai Wu, Bo Yang, Libin Zhao, Ning Hu
Summary: The impact of internal stress on the scratching behavior of titanium single crystal is explored through molecular dynamics simulations, using compressive/tensile pre-strain. The model with compressive pre-strain exhibits higher friction force compared to the model with tensile pre-strain, attributed to atomistic spacing and pile-up distribution. Plastic deformation is dominated by three types of dislocations: edge dislocation loop, prism edge dislocation, and screw dislocation. The coupling of dislocation loop and screw dislocation in the model with tensile pre-strain results in more defects in the matrix, while a small compressive pre-strain decreases the dislocations in the matrix and reduces internal crystal damage. Overall, compressive/tensile internal stress has a significant impact on scratching behavior, providing an avenue for altering the friction and wear properties of titanium.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Acoustics
Cuihua An, Tianyu Wang, Shikang Wang, Xiaodong Chen, Xiaopeng Han, Shuai Wu, Qibo Deng, Libin Zhao, Ning Hu
Summary: Developing green, environmental, sustainable new energy sources is an important global issue. Two-dimensional materials have attracted widespread attention and can potentially replace noble metals as electrocatalysts due to their adjustable physical and chemical properties. This review focuses on the applications and research advances of ultrasound-assisted preparation of two-dimensional materials in the field of electrocatalysis.
ULTRASONICS SONOCHEMISTRY
(2023)
Review
Materials Science, Multidisciplinary
Shuo Zhao, Jiaxiang Li, Jindong Hao, Tianyu Wang, Jie Gu, Cuihua An, Qibo Deng, Zhifeng Wang, Shuai Wu, Libin Zhao, Ning Hu
Summary: Similar to biological muscles, actuator materials convert external stimuli into mechanical responses through reversible changes in material dimensions. Nanoporous metals, as a new type of high surface-area actuator materials, undergo reversible dimensional changes when an electronic voltage is applied on the surface. The dimensional changes are influenced by the surface stress of the nanoporous metal and can be modulated by co-adsorbed sulfate counter-ions. Dealloyed nanoporous metals have gained significant attention in various fields and this review summarizes their recent developments and applications in actuation. Experimental strategies and advances in actuator materials are highlighted, and potential future research directions are discussed.
Article
Materials Science, Multidisciplinary
Fuhai Liu, Maozhong Yi, Liping Ran, Yicheng Ge, Ke Peng
Summary: 2.5D carbon fiber-reinforced carbon and boron nitride dual matrix composites were successfully prepared by a combined process, showing that the content of h-BN fillers has a significant impact on the microstructure and mechanical properties of the composites.
MATERIALS CHARACTERIZATION
(2021)
Article
Engineering, Mechanical
Busra Duran, Jerome Cavoret, David Philippon, Fabrice Ville, Arnaud Ruellan, Frank Berens
Summary: This study analyzes the changes in the physicochemical properties and tribological performances of gear transmission oils during field operation, finding differences from traditional engine oils.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Baocheng Liu, Hongsheng Chen, Jun Zhou, Jing Wang, Wenxian Wang, Xiaochun Chen, Sanxiao Xi
Summary: This study used fast hot pressing sintering to fabricate WC/AlCoCrFeNi2.1 metal matrix composites (MMCs). It was found that the addition of reinforced particles increased the microhardness, nanoindentation and wear resistance of the MMCs. During frictional processes, an oxide film formed, providing material protection, enhancing stability and reducing friction-induced losses.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Pradip Kumar Verma, Alok Singh
Summary: This study investigates the mechanical properties and wear resistance of CoMoMnNiV high entropy alloy reinforced aluminium matrix composite processed through stir-squeeze casting assisted with an ultrasonic transducer. The results show significant improvements in mechanical properties and wear resistance, with the composite containing 8 wt% HEA demonstrating the highest resistance to wear. Optical microscopy, SEM, and an optical profilometer were used for a thorough examination of the microstructure and worn surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Zhenghai Yang, Yingjian Song, Jinlong Jiao, Wenbo Li, Bao Shangguan, Yongzhen Zhang
Summary: This study investigated the friction, wear properties, and current-carrying properties of copper-graphite composites paired with brass C28000. The results showed that the current-carrying properties of the composite materials were excellent, but their wear rate was the main limiting factor. Furthermore, an increase in the thickness of the graphite layer led to an improvement in the uniformity of damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Moustafa Mahmoud Yousry Zaghloul, Karen Steel, Martin Veidt, Michael T. Heitzmann
Summary: This research evaluates and compares the impact of different material types on the tribological characteristics of Polyamide 6 composites, and finds that glass fiber-reinforced Polyamide 6 exhibits better friction and wear performance under high-pressure velocity factors.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Shaoqing Qin, Lida Zhu
Summary: In this paper, the surface and subsurface damage of laser assisted grinding CrCoNi medium entropy alloys were investigated using molecular dynamics simulations. The results showed that the application of laser energy can reduce cutting forces and minimize subsurface damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Kaikui Zheng, Youxi Lin, Tingzheng Lai, Chenghui Gao, Ming Liu, Zhiying Ren
Summary: The study investigated the use of waste foundry resin-bonded sand as a substitute for copper in resin-based brake material. It found that the waste sand was more favorable for improving the overall friction and wear properties of the material compared to copper. Waste sand benefited the material by forming a friction layer, leading to increased friction coefficient and stability. Brake material with 10-15% waste sand showed excellent heat-fade resistance.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Dayang Li, Fanhao Zhou, Yutong Gao, Kun Yang, Huimin Gao
Summary: This article introduces a continuous prediction model based on deep learning for predicting the power output of steam turbines. The model uses long short term memory (LSTM) method to develop a trend prediction model and optimizes the prediction model through feature selection method. Experimental results show that the model outperforms other models in terms of prediction performance.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Tomohiro Toyoda, Ryo Yasuike, Toshihiro Noda
Summary: In this study, a elasto-plastic constitutive model of friction incorporating the concept of superloading surface was developed based on the subloading friction model. The proposed model achieves a smooth transition of friction by describing the evolution rule of structure, treating the state with static friction coefficient larger than kinetic friction coefficient as the bulkiness of structure. The positive definiteness of the plastic multiplier, loading condition, and material parameters were derived, and the validity of the proposed model in accordance with the subloading-friction model was confirmed through a stick-slip simulation of a mass-spring system.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
P. Balaji, B. Surya Rajan, K. Sathickbasha, P. Baskara Sethupathi, Deviga Magadevan
Summary: This study emphasizes the importance of using a variety of solid lubricants with different oxidation temperature regimes to enhance the tribological performance of brake pads.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Jian Ma, Yancong Liu, Javad Mostaghimi, Na Zhang
Summary: This paper investigates the influence of preparation strategies on the lubrication properties of surface textures. Three laser scanning strategies are proposed to achieve a sinusoidal textured surface, and the evolution of surface structure and chemical composition is discussed. The findings show that ridge structures enhance anti-wear properties but also increase the friction coefficient. However, the oil cover preparation method prevents the formation of ridges and improves wettability.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Mohammad Roostaei, Arvin Taghizadeh Tabrizi, Hossein Aghajani
Summary: In this research, the Al2O3/MoS2 nanocomposite coating layer was successfully applied on the surface of Ti-6Al-4 V alloy. The relation between the surface characteristics and wear resistance of the coating was studied using atomic force microscopy analysis and pin-on-disk wear test method. The results showed that the nanocomposite coating significantly reduced the wear rate and provided an equation to calculate the Lancaster coefficient.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Musa Bilgin, Sener Karabulut, Halil Karakoc, Yunus Kayir, Murat Sarikaya
Summary: This study investigates various methods to improve the machinability efficiency of Inconel 718 alloy while considering their effect on microstructural properties. The results show that hot+PMQL, hot+SiCNMQL, and hot+Al2O3-NMQL contribute significantly to the improvement of machinability characteristics. The EBSD analysis also reveals that a limited area is affected by heat in the hot machining environment and that the removal of the heated layer during milling process helps preserve the microstructure.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Q. Gao, Y. Fan, Y. G. Wu, J. L. Liu, J. Wang, L. Li
Summary: Fretting wear significantly affects the hysteresis behavior of the contact surface and leads to joint degradation. This study investigates the influence of harmonic normal force on the evolution of interface morphology and contact parameters with fretting wear. The results show that the harmonic normal force can significantly influence the hysteresis loop and the energy dissipation distribution on the contact surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Benjamin Weiland, Floriane Leclinche, Anis Kaci, Brigitte Camillieri, Betty Lemaire-Semail, Marie -Ange Bueno
Summary: This study presents a systematic approach to generating control signals for a tactile simulator that simulate the touch of textile fabrics. By using a friction modulation tactile surface and acquiring forces from real surfaces with artificial finger mimicking fingerprints, control signals are generated and processed in the frequency domain before sending them to the tactile stimulator. The study focuses on the potential benefits of incorporating fingerprint information in fabric simulations to achieve a more realistic tactile perception. A sensory analysis with 36 participants using the generated control signals showed better discrimination without fingerprint information.
TRIBOLOGY INTERNATIONAL
(2024)
