Article
Chemistry, Physical
Wojciech S. Gora, Jesper V. Carstensen, Krystian L. Wlodarczyk, Mads B. Laursen, Erica B. Hansen, Duncan P. Hand
Summary: This paper presents a laser surface-texturing technique for manufacturing a surface with tailored high static friction coefficient for large marine engines. By combining laser texturing and surface hardening, the surface properties can be adjusted to achieve the desired friction coefficient. The solution has been successfully tested on driveshafts for ships and is planned for adoption in production.
Article
Materials Science, Multidisciplinary
J. L. Montes-Seguedo, I. Dominguez-Lopez, J. D. O. Barceinas-Sanchez
Summary: This study reports the experimental behavior of the UHMWPE/AISI 316L tribopair, indicating that the coefficient of friction is higher for the micro-textured surface compared to the smooth surface. Experimental data shows that the coefficient of friction has an inverse relationship with the load, and a direct relationship with the entrainment and sliding-to-rolling ratio.
Article
Engineering, Mechanical
Slawomir Wos, Waldemar Koszela, Andrzej Dzierwa, Pawel Pawlus
Summary: The study investigated the effect of the apex angle of triangular oil pockets on friction on a disc surface. It was found that the apex angle significantly affected friction reduction, with the smallest coefficient of friction achieved for a disc with a 60-degree apex angle under lower normal load. Conversely, under higher normal load, a larger apex angle corresponded to a higher coefficient of friction.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2022)
Article
Engineering, Manufacturing
Zhengyang Kang, Yonghong Fu, Dashuang Zhou, Qiqi Wu, Tianyang Chen, Yuyang He, Xiaoping Su
Summary: The study developed a multidimensional laser surface texturing (MLST) process to promote lubricity of ring/bore interface, which was found to reduce engine oil and fuel consumptions effectively according to experimental results.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Optics
Junyuan Huang
Summary: The use of laser processing technology to construct textures on 35CrMo can effectively reduce the friction coefficient between parts and extend the service life. Research has shown that the decrease in friction coefficient is caused by the increase in surface roughness.
Article
Engineering, Mechanical
Gerda Vaitkunaite, Cayetano Espejo, Benoit Thiebaut, Anne Neville, Ardian Morina
Summary: This study analyzes the important role of the piston-liner tribological contact in controlling friction energy losses in a passenger car engine. The results confirm that the spatial distribution of low-friction MoS2 tribofilm plays a pivotal role in reducing friction in the piston-liner contact. The presence of MoS2 throughout the engine cycle indicates the effectiveness of the friction modifier MoDTC, contributing to overall energy savings in passenger cars.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Hakan Kaleli, Selman Demirtas, Veli Uysal, Ioannis Karnis, Minas M. Stylianakis, Spiros H. Anastasiadis, Dae-Eun Kim
Summary: The addition of 0.02 wt % of reduced graphene oxide significantly improved the tribological behavior of the commercialized, fully synthetic engine oil, reducing the friction coefficient and forming a protective layer between the worn surfaces. Additionally, various characterization techniques revealed the presence of carbon accumulation and additive elements on the rubbing surfaces of the steel ball and block.
Article
Engineering, Mechanical
Mao Ueda, Amir Kadiric, Hugh Spikes
Summary: This study found that adding other surface-active additives to lubricants can reduce DLC wear promoted by MoDTC, mainly by forming thick antiwear tribofilms, reducing the amount of MoO3, and competitive adsorption.
Article
Engineering, Mechanical
Yin Bifeng, Jiang Yuhao, Xu Bo, Jia Hekun, Wang Xuefeng
Summary: The lubrication model of laser-textured plunger pair was established to study the friction-and-wear performance of different surface textures under diesel and methanol lubrication. The results showed that methanol may deteriorate the lubrication performance of the plunger surface, but surface texturing has the potential to improve it. Friction and wear tests demonstrated that the textured plunger had lower friction coefficient and reduced surface wear compared with the non-textured plunger in methanol lubrication.
INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Lanqi Zhang, Nan Li
Summary: In this study, the anti-friction and anti-wear capacity of 0.05 wt% graphene or/and 0.5 wt% MoDTC were investigated in PAO base oil at different test temperatures. The results showed that graphene alone mildly reduced the friction coefficient at low test temperatures, while MoDTC alone effectively reduced the friction coefficient at different test temperatures. Graphene-MoDTC dual additive further improved the lubricating performance of PAO base oil by forming MoS2 tribo-film and enhancing the anti-wear characteristics.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Chemistry, Physical
Huixin Wang, Yunhai Ma, Zongchun Bai, Jianlong Liu, Lianfei Huo, Qinghua Wang
Summary: Friction and wear are important issues for engineering applications. In this study, laser-based surface treatment methods were used to modify the properties of textured surfaces, resulting in superhydrophobic surfaces with reduced friction coefficient. The surface texture, wettability, and chemistry have combined effects on the tribological performance.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Mechanical
Gang Shen, Jufan Zhang, David Culliton, Ruslan Melentiev, Fengzhou Fang
Summary: Tribological performance plays a crucial role in the lifespan of artificial joints. The relationship between surface roughness and coefficient of friction has been studied under both dry and lubricated conditions. The results show that the friction coefficient does not always decrease with decreasing surface roughness under dry test, but instead exhibits a threshold value. However, under wet test, the coefficient of friction consistently decreases as the surface roughness reduces. Surface texturing technology has been proven effective in improving tribological performance.
FRONTIERS OF MECHANICAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Yujie Han, Feng Liu, Kedong Zhang, Qiang Huang, Xuhong Guo, Chengdong Wang
Summary: In this study, innovative patterned surface micro textures were manufactured on Co-Cr-Mo alloy by laser surface texturing (LST), improving its hardness and wettability. Frictional experiments showed that concentric circles micro textures had the best tribological properties, significantly reducing COF and weight loss. The relationship between surface wettability and COF of the textured Co-Cr-Mo alloy was discussed and the mechanism for the effects of the surface micro-textures was revealed.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Multidisciplinary Sciences
Thachnatharen Nagarajan, Mohammad Khalid, Nanthini Sridewi, Priyanka Jagadish, Syed Shahabuddin, Kasturi Muthoosamy, Rashmi Walvekar
Summary: In this research, molybdenum disulfide (MoS2) nanoparticles were synthesized and dispersed in engine oil to formulate a nanolubricant. The nanolubricant showed significant improvements in coefficient of friction, wear scar diameter, oxidation induction time, and thermal conductivity compared to the base oil.
SCIENTIFIC REPORTS
(2022)
Review
Chemistry, Physical
Mohit Vishnoi, Paras Kumar, Qasim Murtaza
Summary: Surface texturing is a widely used technique to alter the mechanical and tribological properties of materials, but unoptimized parameters may deteriorate the material properties.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Mechanical
Tiago Cousseau, Adriano Goncalves Passos
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2020)
Article
Engineering, Mechanical
L. Biazon, B. P. Ferrer, A. Toro, T. Cousseau
Summary: Twin disc tests were used to evaluate the impact of different rail grease formulations on friction, wear, and retentivity, showing that thickener type and base oil viscosity play crucial roles in determining the performance of rail greases.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
L. L. X. Augusto, M. H. Takahama, C. O. R. Negrao, T. Cousseau
Summary: This paper presents a numerical investigation of non-isothermal grease flow in labyrinth seals, considering the effects of heat transfer and viscous thermal dissipation on mechanical losses. The study found that heat transfer and viscous dissipation, which increase with shaft rotational speed, raise flow temperature, reducing grease viscosity and friction losses. Additionally, the influence of labyrinth materials (steel and polymer) on heat loss and viscous losses was analyzed, with polymer labyrinth showing higher temperature levels due to lower thermal conductivity.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
H. L. Costa, K. S. Evangelista, T. Cousseau, J. S. R. Acero, F. Kessler
Summary: This study found that the presence of ethanol in ZDDP tribofilms increases friction and surface damage, while reducing the amount of long-chain phosphates in the tribofilms, leading to decreased wear performance. The sulphides in the tribofilms were richer in Fe in the presence of ethanol, indicating more severe wear.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Computer Science, Hardware & Architecture
Adriano G. Passos, Tiago Cousseau, Marco A. Luersen
Summary: This paper proposes a smart deep convolutional neural network for real-time surface inspection of steel rolling sheets. The model is characterized by its small size and low computational burden, and achieves near-perfect accuracy on a public dataset.
COMPUTER SYSTEMS SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Elisiane Maria Berton, Bruna Corina Emanuely Schibicheski Kurelo, Ane Cheila Rovani, Tiago Cousseau, Julio Cesar Klein das Neves, Giuseppe Pintaude, Paulo Cesar Borges
Summary: The friction and wear behavior of AISI 409 samples after thermochemical treatment were investigated. It was found that the higher the hardening, the higher the friction coefficient. Abrasion was observed as the primary mechanism in all specimens, with a transitional behavior depending on the original hardness of the surface. Among the specific treatment conditions, NS-Q950-T2 and NS-Q1050-T2 showed the best balance of wear and corrosion performances.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
Article
Engineering, Mechanical
Fernanda Kouketsu, Daniel Pacholok, Tiago Cousseau, Carlos Henrique da Silva
Summary: This study proposes a method for evaluating the abrasion resistance of polymeric idler rolls using a rubber-wheel tribometer and defines a threshold limit. The wear mechanisms observed through scratching tests and scanning electron microscopy were discussed as indicators of material abrasion resistance.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
Article
Engineering, Mechanical
B. P. Ferrer, L. Biazon, A. Zuin, P. Tayer, A. Toro, T. Cousseau
Summary: The effect of rail grease formulation on friction, wear, and grease loss due to centrifugal force was evaluated. Six greases were used to isolate the effects of thickener and base oil viscosity, which had the same consistency and additive package but different base oil viscosities and thickener types. The results showed that lithium greases have lower friction but higher wear than calcium greases, higher kinematic viscosity reduces wear but increases friction regardless of the thickener type, the critical speed at which grease is expelled from the disc increases with viscosity for lithium-thickened greases and does not depend on viscosity for calcium greases, and lithium greases with high base oil viscosity are best suited for wheel-rail interface lubrication.
TRIBOLOGY TRANSACTIONS
(2023)
Article
Engineering, Mechanical
Oriana Palma Calabokis, Yamid Enrique Nunez de la Rosa, Samara Paulin de Moraes, Estela Vicentim Antunes, Tiago Cousseau, Carlos Henrique da Silva
Summary: This study proposes a comprehensive assessment method for contact fatigue of gears and tests it using 18CrNiMo7-6 and 20MnCr5 materials. The method correlates changes in roughness and pit-damaged area with stress distribution and identifies plastic deformation as a wear mechanism. The study finds that despite their differences, the two materials have similar fatigue life.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
Article
Engineering, Mechanical
Ana Cecilia de Carvalho, Andrei Bavaresco Rezende, Fernanda de Melo Fernandes, Rodrigo da Silva Miranda, Edilson Jun Kina, Tiago Cousseau, Paulo Roberto Mei
Summary: Using greases provides various benefits to the railroad system, such as prolonging the lifespan of wheels and rails, reducing fuel consumption, and decreasing friction coefficient and component wear. However, there is still a lack of understanding regarding the correlation between grease formulation and its performance. This study aims to explore the impact of grease viscosity and thickener on wear reduction ability. Hence, a series of tests were conducted using a twin disc tribometer. Four greases were tested, formulated with the same additive package and base oil but with varying viscosities (50 cSt and 500 cSt) and thickeners (calcium and lithium). Results revealed that lithium-thickened greases outperformed calcium ones due to lower mass losses and crack depths, smaller plastically deformed subsurface layers, and higher retentivity. Additionally, the findings indicated that lower viscosity (50 cSt) demonstrated superior performance due to lower mass losses and crack depths. However, the higher viscosity exhibited higher retentivity compared to the 50 cSt greases.
Article
Engineering, Mechanical
Oriana Palma Calabokis, Yamid Nunez de la Rosa, Vladimir Ballesteros-Ballesteros, Paulo Cesar Borges, Tiago Cousseau
Summary: Metal conditioners are added to lubricants to improve their friction and wear properties in friction pairs, mainly in engines, gearboxes, and rolling bearings. This study investigated the effect of mixing metal conditioners with commercial engine oil, and found that the mixture improved the wear resistance and formation of tribofilms on steel-steel contacts.
Review
Engineering, Mechanical
Henara Lillian Costa, Tiago Cousseau, Roberto Martins Souza
Summary: The urgent need to reduce emissions due to global warming requires a radical energy transition in transportation. Biofuels play a fundamental role in achieving a clean and sustainable future. The use of ethanol fuel in passenger cars can reduce emissions, but it also brings challenges to engine friction, lubrication, and wear. This review addresses the effects of ethanol fuel on car engines and identifies gaps in knowledge and trends in lubricants for ethanol-fueled engines.
Article
Engineering, Multidisciplinary
Joao Pedro Ceniz, Rodrigo de Sa Martins, Marco Antonio Luersen, Tiago Cousseau
Summary: In this study, an optimization methodology using metamodels based on radial basis functions was implemented to reduce the mass of two models of ore conveyor belt rollers. The method achieved a significant reduction in mass for both metal and polymer rollers without violating constraints. The study presents a low-computational-cost optimization method for roller designs that can be adapted for use with rollers made of different materials.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2022)
Article
Engineering, Mechanical
Oriana Palma Calabokis, Yamid Nunez de la Rosa, Paulo Cesar Borges, Tiago Cousseau
Summary: This study evaluated the performance of a commercial metal conditioner (MC) and found that it can reduce wear and friction between metal components. Field tests showed that mixing MC with fully formulated oil can reduce wear and friction during the engine break-in period.
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)
