Article
Engineering, Mechanical
T. Schirra, G. Martin, S. Puchtler, E. Kirchner
Summary: This paper presents an experimental setup and calculation procedure for measuring and predicting the electric impedance of rolling bearings as a sensor model for bearing loads. By considering unloaded rolling elements and the undeflected area of loaded rolling elements, the model has been improved to provide more accurate predictions compared to the state of the art. However, there is still a difference between measurement and calculation, which requires further approaches to reduce the discrepancy.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Leoluca Scurria, Tommaso Tamarozzi, Oleg Voronkov, Dieter Fauconnier
Summary: The study compared the performance of different methods under various elastohydrodynamic lubrication conditions, quantifying their differences to understand the advantages and limitations of each.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
S. Puchtler, T. Schirra, E. Kirchner, Y. Spaeck-Leigsnering, H. De Gersem
Summary: This study compares different methods for calculating the capacitance of unloaded rolling elements to improve the electric characterization of rolling element bearings. Semi-analytical approximations and finite element simulations are used, and a closed-form analytical two-dimensional solution is derived for comparison. The results show that the most common semi-analytical approximation, which uses effective radii to express the contact geometry, reproduces the trend from numerical and analytical calculations, but overestimates the results derived from numerical simulations. Another semi-analytical approach is presented that delivers better results for the capacitance of unloaded point contacts.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Steven J. Lorenz, Farshid Sadeghi
Summary: This study presents an investigation into the rolling contact fatigue performance of AISI M50 bearing steel under a range of Hertzian contact pressures. Both experimental and analytical approaches were used to establish the relationship between contact pressure and fatigue life. The results show good agreement between the experimental and analytical data sets, highlighting the significance of combining experimental tools and computational models in assessing the RCF performance of bearing materials.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Akhil Vijay, Farshid Sadeghi
Summary: This study investigates the fatigue failure in rolling element bearings, considering the anisotropy of the bearing material and the coupled elastohydrodynamic lubrication. Finite element method is used to model the bearing steel microstructure and the EHL effects. The damage accumulation in the grain boundaries is utilized to model crack initiation and propagation, providing predictions for fatigue life. The model results demonstrate the stochastic nature of bearing failures reported in the literature.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Steven J. Lorenz, Farshid Sadeghi, Hitesh K. Trivedi, Mathew S. Kirsch
Summary: This study evaluated the performance of common aerospace-quality bearing steels in rolling contact fatigue through experimental and analytical methods. Three types of aerospace-quality bearing steels were procured and evaluated. The evaluation was conducted using a 3 ball-on-rod rolling contact fatigue test rig and a torsion fatigue test rig. The results provided insights into the material's strength and performance in different fatigue conditions.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Pascal Ehret, Ali Ghanbarzadeh
Summary: The paper discusses the developments made by Professor Dowson at Leeds University in elastohydrodynamic lubrication, from early solutions to his recent contributions in biotribology and mixed lubrication.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Steven J. Lorenz, Farshid Sadeghi, Akshat Sharma, Chinpei Wang, Ben Wang
Summary: This work presents an improved probabilistic continuum damage mechanics (CDM) finite element (FE) model to estimate rolling contact fatigue (RCF) life of critical tribological components. The model considers multiple failure criteria and describes critical damage material parameters using a distribution. Forty unique material microstructure models were created to capture the random pathways for crack growth. The results demonstrate that the Fatemi-Socie and shear stress reversal failure criteria compared favorably to Lundberg-Palmgren theory.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Guillermo E. Morales-Espejel, Armando Felix Quinonez
Summary: The paper presents a stress-based model for predicting the life of rolling/sliding contacts in machine elements, considering surface and subsurface survival. The model requires input of the contact stress distribution and lubrication quality. It is illustrated using the example of spur gears and shows the ability to predict gear endurance and the contribution of the surface. This approach is advantageous for future gear design and applicable to rolling bearings and cam-follower systems.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Steven J. Lorenz, Farshid Sadeghi, Chinpei Wang
Summary: This investigation examines the effect of various spatial hardness gradients on rolling contact fatigue life. The results show that polynomial gradients with degree greater than 1 outperform linear and polynomial gradients with degree less than 1, particularly at shallower gradient depths. Additionally, increasing gradient depth and increasing compressive residual stress improve the resistance to rolling contact fatigue.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Steven J. Lorenz, Farshid Sadeghi, Hitesh K. Trivedi, Lewis Rosado, Mathew S. Kirsch, Chinpei Wang
Summary: In this study, a CDM FE model was developed to investigate the effects of surface roughness on RCF life, using optical surface profilometer to measure roughness of deep groove bearings. The results showed that as roughness amplitude increases or lambda ratio decreases, fatigue lives decrease for various frequencies. Subsurface failure fatigue lives are reduced with increasing roughness frequency, regardless of amplitude or Hertzian pressure. The investigation results were used to develop surface roughness effects for RCF life equations in rolling element bearing applications.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Industrial
Bin Xie, Yanzhong Wang, Yunyi Zhu, Peng Liu, Yu Wu, Fengxia Lu
Summary: In this study, a physical model for analyzing the reliability of ACBB considering the coupled effect of RCF damage and wear is proposed. The proposed model is validated through a practical example of ACBB.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2024)
Article
Engineering, Mechanical
Predrag Andric, Sebastian Echeverri Restrepo, Junbiao Lai, Cornelis H. Venner, Erik Vegter
Summary: Martensite decay due to large scale microstructural alterations is the main fatigue process in bearing applications. The study demonstrates that the decay is mainly driven by the positive components of the principal subsurface stress tensor. The analysis provides mechanistic insights into why the fastest material decay occurs at specific depths.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Kushagra Singh, Farshid Sadeghi, Thomas Russell, Steven J. Lorenz, Wyatt Peterson, Jaret Villarreal, Takumi Jinmon
Summary: This paper presents a partitioned fluid-structure interaction (FSI) solver to model elastohydrodynamic lubrication (EHL) of line contacts. The FSI model uses the multiphysics simulation software Ansys and employs finite volume method (FVM) and finite element method (FEM) to determine the interaction between fluid and solid components and structural response. By removing any assumptions relative to the Reynolds equation, the model offers a detailed understanding of EHL contacts.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
G. Martin, Florian Michael Becke, E. Kirchner
Summary: This paper presents a novel condition monitoring method for rolling bearings based on measuring the electric bearing impedance. The method can diagnose damage presence through frequency-domain analysis and assess the severity and progression of bearing damage through time-domain analysis.
TRIBOLOGY INTERNATIONAL
(2022)
Correction
Engineering, Chemical
M. Bjoerling, W. Habchi, S. Bair, R. Larsson, P. Marklund
Article
Computer Science, Interdisciplinary Applications
W. Habchi
ADVANCES IN ENGINEERING SOFTWARE
(2019)
Correction
Engineering, Mechanical
M. Bjorling, W. Habchi, S. Bair, R. Larsson, P. Marklund
TRIBOLOGY INTERNATIONAL
(2019)
Article
Engineering, Mechanical
Wassim Habchi, Scott Bair
TRIBOLOGY INTERNATIONAL
(2019)
Article
Engineering, Mechanical
J. S. Issa, W. Habchi
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2020)
Article
Engineering, Mechanical
Wassim Habchi, Scott Bair
TRIBOLOGY INTERNATIONAL
(2020)
Article
Engineering, Mechanical
W. Habchi
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2020)
Article
Engineering, Mechanical
Scott Bair, Wassim Habchi
Summary: This note discusses the working state of the optical EHD rig under different pressure-viscosity coefficients and its relationship with the pressure dependence of viscosity.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
W. Habchi
Summary: This study investigates the influence of roller-end axial profiling type on the lubrication performance of thermal elastohydrodynamic finite line contacts. It is found that a logarithmic profile outperforms a dub-off one in terms of frictional dissipation, lubricant film thickness, pressure buildup, and temperature rise, unless an extremely steep logarithmic shape is adopted.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
W. Habchi
Summary: This work presents a comprehensive numerical study on the thermal elastohydrodynamic lubrication performance of axially crowned rollers using a full-system finite element approach. The study reveals that axial crowning has a negative influence on friction, significantly increasing it compared to straight rollers. It is also shown that increasing crowning height leads to an increase in minimum film thickness, but also an increase in friction. The study suggests that a combination of axial crowning and roller-end profiling is the best compromise for enhancing film thickness while minimizing friction. However, when friction is the most critical design parameter, a simple roller-end profiling would be the best compromise.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Chemical
Wassim Habchi, Philippe Vergne
Summary: The study introduces a quantitative method for predicting minimum film thickness in elastohydrodynamic-lubricated circular contacts based on central film thickness. Comparison with traditional film thickness formulae and recent expressions revealed the former's inability and the latter's tendency to overestimate the central-to-minimum film thickness ratio. The proposed approach was validated against numerical and experimental data, showing excellent agreement.
Article
Engineering, Mechanical
W. Habchi
Summary: The commonly accepted roughness attenuation theory in elastohydrodynamic lubricated contacts is found to have three shortcomings in describing the deformation of surface features. A correction procedure is proposed to rectify these shortcomings without the computational burden of incorporating surface features into the contact geometry.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2023)
Article
Engineering, Mechanical
Jad Mounayer, Wassim Habchi
Summary: This paper introduces a novel model order reduction technique for analyzing thermal elastohydrodynamic lubrication problems. The method reduces the size of the linear elasticity part within the overall matrix system using static condensation, and avoids solving a semi-dense matrix system with a splitting algorithm. The results demonstrate the exactness of the proposed methodology and the reduction in computational times.
Article
Engineering, Chemical
Scott Bair, Wassim Habchi
Summary: Temperature affects thermal elastohydrodynamic lubrication (TEHL) through the temperature dependence of liquid viscosity. The pressure and temperature dependence of viscosity increases rapidly near the glassy state, known as fragility. Ignoring fragility in TEHL analyses has led to inadequate viscosity correlation and without considering this behavior, significant differences in friction and minimum film thickness are observed. The influence on friction is seen even under moderate load and speed conditions, while the influence on film thickness seems to be limited to high loads.
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)
