Article
Engineering, Mechanical
G. Boidi, P. G. Gruetzmacher, A. Kadiric, F. J. Profito, I. F. Machado, C. Gachot, D. Dini
Summary: This study demonstrated the potential of fast laser texturing techniques in improving the tribological performance of bearings and mechanical components. Dimples were found to reduce friction effectively compared to smooth surfaces, while grooves had less beneficial effects. Additionally, dimples promoted the formation of full film lubrication conditions at lower speeds.
Article
Chemistry, Physical
Jianxin Sun, Linqing Bai, Feng Guo, Zulfiqar Ahmad Khan
Summary: This study investigates the effects of micro-dimple textures on the friction performance of mechanical components. The results show that the dimples affect the pressure distribution and the local film thickness distribution in the contact area. Sliding velocity, load, dimple location, and dimple depth also influence the film thickness distribution.
Article
Engineering, Mechanical
Daofei Wang, Jialong Yang, Pengchong Wei, Wei Pu
Summary: This article focuses on the application of grease lubrication in rolling element bearings and the establishment of a mixed EHL model. Experimental results show that the grease friction behavior corresponds well with the variation of grease film thickness.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Sorin-Cristian Vladescu, Chiharu Tadokoro, Mayu Miyazaki, Tom Reddyhoff, Takuo Nagamine, Ken Nakano, Shinya Sasaki, Yoshinobu Tsujii
Summary: This study investigates the interactions between concentrated polymer brushes (CPBs) and laser-produced surface texture (LST). The results show that the combination of CPB-LST can reduce the friction coefficient and improve the durability of CPBs through a lateral support mechanism offered by the textured micro-features. The study also reveals the failure mechanisms of CPBs, which are important for the development of CPBs for future applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Coatings & Films
Gang Shen, Jufan Zhang, Chengwei Kang, Fengzhou Fang
Summary: A new surface texturing design has been proposed to improve the tribological performance of bioimplants, with experimental results showing significant reductions in friction coefficient and wear rate compared to polished samples. The study confirmed that the hydrodynamic pressure in the textured bioimplants plays a negligible role, with the main working mechanisms being the ability to trap particles and provide a second lubrication effect.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Mechanical
M. Venkata Krishna Reddy, Basil Kuriachen, Jino Joshy, M. L. Joy
Summary: This study investigates the influence of areal surface parameters according to ISO 25178 on the tribo-logical behavior of Ti6Al4V alloy. Lubricated sliding wear experiments were conducted at varied weights and sliding speeds using pin-on-disk tribo test with EN31 steel disk as the counter body and SAE40W15 as the lubricant according to ASTM G-99. The lowest friction coefficient was observed at a sliding velocity of 3 m/s, independent of normal load, while wear rate increased with increasing normal load. A number of areal surface parameters showed strong correlation with coefficient of friction (CoF) and wear depth. Among them, Spk had a correlation coefficient of -0.8247 with CoF, and Vvv had a correlation coefficient of -0.8415 with wear depth. Vvv and Svk retained the lubricant and extended the life of the component.
TRIBOLOGY INTERNATIONAL
(2023)
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
Engineering, Mechanical
Xiuhua Zhang, Peitang Wei, Robert G. Parker, Guoliang Liu, Huaiju Liu, Shaojie Wu
Summary: This study investigates the relation between surface integrity and contact fatigue of gears. The results show that gears with high surface integrity exhibit the highest contact fatigue limit, which is 15.1% higher than gears with carburizing and grinding. Surface hardness, maximum compressive residual stress, and surface roughness are the most significant factors affecting contact fatigue life and fatigue limit. The proposed formulae have reasonable prediction accuracy for fatigue life and fatigue limit.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Mechanics
Amir Torabi, Mohammad Hossein Alidousti
Summary: Estimating and reducing friction and wear is a challenging problem. This study investigates a model for the behavior of grease as a lubricant on surfaces and develops a friction estimation formula. By making small dimples on the surface, the preservation of lubricant in the contact area is increased, leading to less friction. The experimental and numerical results show consistent findings, with a 4.5 percent average error in friction estimation and 7 percent less friction on textured surfaces compared to flat surfaces.
Article
Engineering, Mechanical
Gang Wang, Wei Wang, Yi Zhang, Jinlong Shen, Jimin Xu, Kun Liu
Summary: This paper investigates the effects of solid particles on point contact mixed lubrication. The results show that the particle physical parameters and operating conditions change the proportion of load carrying capacity. An increase in particle size and surface roughness leads to an increase in minimum oil film thickness. The shear strength, size, and concentration of particles play an important role in friction characteristics.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2022)
Article
Engineering, Mechanical
Zhongliang Xie, Jian Jiao, Kang Yang
Summary: Traditional water-lubricated bearings face challenges in forming effective lubricating film under extreme low-speed and heavy-duty conditions, leading to shortcomings such as low-load, high-resistance, high-vibration, and high-noise. The paper proposes a novel multi-field coupling lubrication model to investigate the mixed lubrication performances and critical characteristics of these bearings. By developing functional mapping relationships and building rotor dynamic models, the paper reveals the variation mechanisms of dynamic behaviors and verifies the correctness of the model and algorithm through theoretical analysis and experiment. The academic value of this research is expected to achieve a novel breakthrough in forming effective hydrodynamic film under extreme severe conditions for water-lubricated bearings.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Yawen Xue, Chaohua Wu, Xiaoliang Shi, Kaipeng Zhang, Qipeng Huang
Summary: The study found that textured surfaces with SnAg-Cu-Ti3C2 (TSs-SACT) exhibit excellent tribological properties at high temperatures and prolong the life of enamel layers.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Kazuyuki Yagi, Wataru Matsunaka, Joichi Sugimura
Summary: This study investigates the effect of textured patterns on lubrication performance in starved hydrodynamic lubrication. Longitudinal or transverse grooves on discs are found to improve lubricant supply into the lubricated area at high sliding conditions, compared to a flat disc.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
S. Boedo
Summary: This study investigates the impact of surface ellipticity on self-acting partial arc journal bearings under steady load and sinusoidal oscillation, taking into account mass conserving cavitation. The computational efficiency is improved by using a generalized Warner bearing (GWB) formula. The results demonstrate that an elliptical sleeve can significantly improve bearing performance at small oscillation amplitudes commonly found in practical applications, and a fully hydrodynamic lubrication regime can be established through the wearing-in process of the sleeve surface.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Yanzhong Wang, Kai Yang, Xiaomeng Chu, Wen Tang, Changyong Huang
Summary: An engineering calculation model is introduced to analyze point-contact elastohydrodynamic lubrication of spiral bevel gears, revealing the transient lubrication characteristics and film thickness variations during the meshing process.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Biomedical
D. Necas, K. Sadecka, M. Vrbka, A. Galandakova, M. A. Wimmer, J. Gallo, M. Hartl
Summary: The study aims to evaluate the formation of a protein lubricating film in knee implants by observing contact between real femoral and transparent polymer tibial components under various protein solutions in a knee simulator. The results showed significant differences in appearance and protein agglomerations in the contact area, indicating strong interactions among molecules of synovial fluid. The thickness of the lubricating layer stabilized within around 50 seconds, highlighting the importance of understanding lubrication for durable knee replacements.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Engineering, Mechanical
Motohiro Kaneta, Kenji Matsuda, Jing Wang, Jinlei Cui, Peiran Yang, Hiroshi Nishikawa, Ivan Krupka, Martin Hart
Summary: Based on a transient non-Newtonian thermal elastohydrodynamic lubrication (EHL) model, the interactions and features of different rough surfaces were discussed, showing that material properties, thermal conductivity, and velocity differences affect surface shapes and pressure behavior.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
David Necas, Martin Vrbka, Max Marian, Benedict Rothammer, Stephan Tremmel, Sandro Wartzack, Adela Galandakova, Jiri Gallo, Markus A. Wimmer, Ivan Krupka, Martin Hartl
Summary: This study provides a detailed understanding of lubrication mechanisms in total knee replacement through experimental investigation and numerical modeling. The use of fluorescently labeled synovial fluids revealed the interactions between different components, leading to a novel lubrication model for knee implants.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Max Marian, Christian Orgeldinger, Benedict Rothammer, David Necas, Martin Vrbka, Ivan Krupka, Martin Hartl, Markus A. Wimmer, Stephan Tremmel, Sandro Wartzack
Summary: Total knee replacements are an effective surgical treatment for restoring knee function, with the design process requiring a good understanding of stresses and lubrication conditions. A fully-coupled transient 3D model was proposed and validated in this study, showing strong influences of fluid and geometry assumptions, transient effects, and the rheological properties of synovial fluid on tribological behavior.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Cheney Quinn, David Necas, Petr Sperka, Max Marian, Martin Vrbka, Ivan Krupka, Martin Hartl
Summary: This study investigates the effects of kinematic conditions, configuration, viscoelasticity, and lubricant viscosity on friction in lubricated compliant contacts. Experimental data was used to develop a numerical simulation predicting fluid friction in compliant contacts, revealing that viscoelastic effects are present in all configurations and that slide-to-roll ratio affects rolling friction in all configurations.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Biomedical
Matus Ranusa, Pavel Cipek, Martin Vrbka, David Palousek, Ivan Krupka, Martin Hartl
Summary: Additive manufacturing enables customization of implants, but designing wear-resistant articulating surfaces is challenging. Understanding the interaction between surfaces and lubricant fluid, as well as the lubrication film formation mechanism, is necessary.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Engineering, Chemical
S. Reitschuster, E. Maier, T. Lohner, K. Stahl, K. Bobzin, C. Kalscheuer, M. Thiex, P. Sperka, M. Hartl
Summary: The potential of diamond-like carbon (DLC) coatings on thermoplastic polymers for reducing friction and wear in highly stressed rolling-sliding contacts was evaluated. The results showed that DLC coatings could reduce friction on the considered polymers under specific lubrication conditions. In terms of wear behavior, DLC coatings showed potential especially under severe mixed lubrication conditions.
Article
Engineering, Multidisciplinary
Daniel Kvarda, Simon Skurka, Radovan Galas, Milan Omasta, Lu-bing Shi, Haohao Ding, Wen-jian Wang, Ivan Krupka, Martin Hartl
Summary: The effect of top of rail lubricant composition on adhesion was investigated, with solid particles for friction modification found to be the most dominant component. Optimized top of rail lubricant substances showed the best adhesion performance and resilience to overdosing.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2022)
Article
Engineering, Multidisciplinary
Pavel Cipek, Martin Vrbka, David Rebenda, David Necas, Ivan Krupka
Summary: This study focuses on the role of albumin protein in the lubrication process of synovial joints. Experimental results show that hyaluronic acid reduces friction and increases the area of albumin adsorbed boundary layer, while phospholipids have the opposite effect. The combination of albumin and c-globulin has no significant effect on the particles count of albumin clusters adsorbed in the contact.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2022)
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
Matus Ranusa, Martin Ondra, David Rebenda, Martin Vrbka, Jiri Gallo, Ivan Krupka
Summary: Lubrication of cartilage is crucial in slowing down the progression of osteoarthritis, and viscosupplementation is a potential therapeutic intervention that can supplement the lubrication ability of cartilage with hyaluronic acid. However, selecting a proper viscosupplement remains a challenge, and its molecular weight may influence the development of the coefficient of friction.
Article
Acoustics
Lubos Smolik, Jan Rendl, Milan Omasta, Miroslav Byrtus, Petr Sperka, Pavel Polach, Martin Hartl, Michal Hajzman
Summary: This paper investigates the effects of mechanically induced textures on the stability of journal bearings, focusing on lightly loaded bearings commonly used in vertical rotors and microturbines. The results show that textures near the minimum oil film thickness can improve stability at low loads, but have little effect at a specific load of 0.15 MPa. The paper also discusses computational methods for dealing with cavitation and highlights the sensitivity of numerical results to the density of computational mesh.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Mechanical
Jiri Krupka, Krystof Dockal, Ivan Krupka, Martin Hartl
Summary: The lubrication of polymer materials is of great importance in engineering applications. The material properties of polymers are strongly influenced by temperature, which affects the lubrication process and the viscoelastic behavior of polymers. Through experimental and model analysis, it is found that the compliant circular contact operates in the Isoviscous-elastic regime of elastohydrodynamic lubrication (EHL), and temperature and load have a significant influence on the thermomechanical response of amorphous polymer PMMA.
Article
Engineering, Biomedical
Risha Rufaqua, Martin Vrbka, Dusan Hemzal, Dipankar Choudhury, David Rebenda, Ivan Krupka, Martin Hartl
Summary: The study investigated the lubricant mechanism in ceramic-on-ceramic hip joint prostheses by examining the biochemical reactions of synovial fluid and frictional coefficients. The results showed that the BIOLOXdelta surface had less reactivity to proteins and model fluid lubricants, while the BIOLOXforte ball surface exhibited chemisorption with proteins, hyaluronic acid, and model fluids. The study also revealed that there was no direct correlation between the measured frictional coefficient and the observed chemical reactions.
JOURNAL OF FUNCTIONAL BIOMATERIALS
(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)
