Article
Engineering, Mechanical
L. Houpert, J. Clarke, C. Penny
Summary: Advanced ball bearing simulations require accurate tribological models to calculate contact load and pressure, and suggest contact stiffness models for ball-cage and cage-guiding ring using Hertzian contact stiffness and/or structural stiffness. Relationships respecting various lubrication regimes are used to calculate film thickness, rolling force, and load increase. Nonlinear visco-elastic-plastic lubricant rheological model is used to define shear rate, shear stress, and sliding force considering pressure and temperature. Elastic effects are approximated using a simple nonlinear visco-plastic model.
TRIBOLOGY TRANSACTIONS
(2023)
Article
Materials Science, Multidisciplinary
Jee-Hyun Kang, Jungwoong Kim, Jun-Yun Kang, Soon-Woo Kwon, Min-Woo Kang, Seung Hyun Hong
Summary: This study provides an in-depth characterization of the formation mechanism of the dark-etching region (DER) caused by rolling contact fatigue in bearing steel. The results reveal that the accumulation of plastic flow and dynamic recrystallization contribute to the hardness reduction and etching behavior, which may lead to spalling of the bearing.
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
Bjorn Kunzelmann, Pawel Rycerz, Yilun Xu, Nagaraj K. Arakere, Amir Kadiric
Summary: This paper investigates the application of linear elastic fracture mechanics (LEFM) principles in predicting the crack propagation of rolling contact fatigue (RCF) in machine elements such as rolling bearings and gears. Experimental tests are conducted on AISI 52100 bearing steel roller specimens to measure crack propagation rates and establish crack geometry. A numerical finite element model based on LEFM methods is developed to predict stress intensity factors (SIFs) during over-rolling, considering factors such as Hertzian contact stresses, contact friction, and crack face friction. The results show that LEFM can accurately predict the growth of RCF cracks and provide insights into the dominant propagation mode and the effects of crack face friction. The findings contribute to the development of tools for predicting the remaining useful life of machine components, enhancing the reliability of mechanical systems.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Shuzhi Gao, Liting Wang, Yimin Zhang
Summary: In this paper, an analytical calculation model based on Jones raceway control hypothesis model was proposed for high-speed ball bearing. The model considers clearance, centrifugal displacement, and thermal deformation. The validity of the proposed model was verified by comparing with the Jones model, and a fatigue life model for the bearing was established. The paper analyzes the bearing dynamic characteristics under axial load and combined load, reveals the change rule of each parameter, and studies the influence of different clearances on high-speed bearing.
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, Mathew S. Kirsch, Chinpei Wang
Summary: This study investigates the effect of prior austenite grain refinement on rolling contact fatigue (RCF) using a finite element model and continuum damage mechanics. The research reveals that finer grain diameter leads to exponentially improved fatigue performance, with resistance stress increasing as grain diameter is refined, while the damage rate exponent shows no correlation with grain diameter. The results of RCF simulations demonstrate good agreement with experimental data from open literature, and a predictive fatigue life equation is constructed to evaluate RCF performance in non-conformal contacts.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Materials Science, Multidisciplinary
Hongxiang Yin, Xue Bai, Hanwei Fu
Summary: The work hardening behavior of GCr15 bearing steel during rolling contact fatigue has been investigated, and a dislocation-based model has been established to predict hardness changes. The experimental and modeling results show good agreement, providing a method for studying the work hardening of different types of bearing steels.
Article
Engineering, Mechanical
Jonathan F. W. Leung, Rohit Voothaluru, Richard W. Neu
Summary: This study introduces a novel Ruiz fretting damage parameter (FDP) implementation to predict the frictional energy dissipation at subsurface cracks, and a parametric study using finite element model explores the role of crack length, orientation, depth, and coefficient of friction (COF) on FDP. The results provide strong evidence of the FDP as a predictor of WEC formation, with specific conditions maximizing the FDP.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Luc Houpert, Oliver Menck
Summary: This article describes standard bearing life models in continuous rotation and explains how to calculate the lifetime of oscillatory ball and roller bearings. It introduces an oscillation factor and provides methods for estimating the necessary parameters. The results derived from this article allow for the calculation of the lifetime of any arbitrary oscillating bearing.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Editorial Material
Engineering, Mechanical
Luc Houpert
Summary: Dowson's film thickness relationship is crucial in the bearing industry for defining factors affecting bearing life. It also helps explain phenomena such as rolling element acceleration and skidding.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Flavien Foko Foko, Lukas Rueth, Oliver Koch, Bernd Sauer
Summary: A multiscale approach is used to estimate the fatigue life of rolling bearings, specifically applied to cylindrical roller bearings. The forces in the rolling contact are determined through system-oriented modeling at the macro level, while microscale contact simulations are conducted using a half-space contact model. The stresses on the inner ring are calculated and utilized for fatigue life estimation using the Fatemi-Socie approach. Various surface variants were examined, including an ideally smooth surface and three real rough surfaces created through different finishing processes. Results from experiments and simulations indicate good predictive capability of the model.
Review
Chemistry, Physical
Muhammad U. Abdullah, Zulfiqar A. Khan
Summary: This article provides a multiscale overview of the plastic deformation and microstructural alterations of bearing steel during rolling cyclic fatigue. It investigates previous models and material hardening approaches used to predict and mimic the cyclic hardening response of the evolved bearing steel microstructure. The review emphasizes the importance of a multidisciplinary approach to fully understand the elastoplastic response, damage evolution, and formation mechanics of microstructural alterations in bearing steels.
Article
Engineering, Mechanical
Akhil Vijay, Farshid Sadeghi
Summary: This paper presents a two-stage approach for modeling the initiation and propagation phases of rolling element bearing failures. By using crystal plasticity and cohesive elements, the method is able to simulate the initiation and growth of cracks, showing good correlation with experimental data.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Srikakulapu Kiranbabu, Lutz Morsdorf, Ivan Gonzalez, Michael Koelling, Christian Bross, Dirk Ponge, Michael Herbig, David Mayweg
Summary: This study investigates the causes of white etching cracks (WECs) in wind turbine gearbox (WTGB) bearings. The results show that the presence of MnS inclusions is a key factor in the initiation of WECs in WTGB bearings.
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)