Article
Engineering, Mechanical
Sougata Roy, Jr Speed Lake, Michael Viola, Huimin Luo, Donovan Leonard, Jun Qu
Summary: This study demonstrated the feasibility of using a phosphonium phosphate ionic liquid as an anti-wear and anti-pitting additive for rear axle lubricant. The results showed effective surface protection for wear and micro-cracking, leading to the production of low-viscosity gear oils with superior rolling contact fatigue mitigation. Full-scale hub dynamometer tests further confirmed the improved power output and torque generation of the IL-containing gear oils compared to commercial benchmarks.
Article
Engineering, Mechanical
B. Wainwright, H. Takeuchi, T. Makino, A. Kadiric
Summary: Micropitting is a major failure mode in gears and rolling bearings. In this study, the individual effects of surface roughness amplitude and A-ratio on micropitting are investigated. It is found that surface roughness has a greater influence on micropitting than A-ratio, and the A-ratio alone is unable to accurately assess the risk of micropitting. Furthermore, there exists a sufficiently low surface roughness below which micropitting is unlikely to occur even at extremely low A-ratios.
Article
Engineering, Mechanical
Mao Ueda, Benjamin Wainwright, Hugh Spikes, Amir Kadiric
Summary: Micropitting is a surface fatigue damage that occurs in rolling-sliding contacts under thin oil film conditions and is poorly understood, Friction has a very significant impact on micropitting, reducing friction can mitigate crack initiation and propagation.
Article
Engineering, Mechanical
Stephan Andre Bohme, Gabor Szanti, Joni Keski-Rahkonen, Tami Komssi, Jose Garcia Santaella, Alexei Vinogradov
Summary: This study evaluates the accuracy of the proposed methodology by comparing it to load-controlled bevel gear tests and develops a method capable of differentiating and accurately predicting pitting and subsurface fatigue.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
Yang Li, Peitang Wei, Ge Xiang, Chenfan Jia, Huaiju Liu
Summary: A transfer learning algorithm was used to predict the gear contact fatigue life by utilizing low-cost fatigue test data, such as twin-disc test data. The results show that this method allows for an effective prediction of gear fatigue life under minor sample conditions.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Shengguan Qu, Xiongfeng Hu, Feng Lu, Fuqiang Lai, Haipeng Liu, Yalong Zhang, Xiaoqiang Li
Summary: Ultrasonic surface rolling (USR) treatment significantly improves the surface properties of steel, enhances rolling contact fatigue (RCF) life, especially under high lubricant viscosity. The dominant failure mode of samples treated with USR is delamination, indicating the effectiveness of the treatment in reducing fatigue failure.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Chemistry, Physical
Zhou Chen, Yibo Jiang, Zheming Tong, Shuiguang Tong
Summary: The study investigates the rolling contact fatigue of gear surfaces in a heavy loader gearbox using a critical plane-based multiaxial Fatemi-Socie criterion. It finds that the optimum residual stress distribution can maximize fatigue initiation life, especially when the friction coefficient is above its critical value. Deviation from the optimum residual stress distribution impacts fatigue initiation life, providing a useful guideline for designing residual stress distribution.
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
Energy & Fuels
Bingbin Guo, Zhixiang Luo, Bo Zhang, Yuqing Liu, Zaigang Chen
Summary: The study presents a fatigue life prediction method for traction motor bearings in locomotives, taking into account the impact of irregular loads caused by wheel flat and the significant influence of wheel-rail interaction on the working conditions and fatigue life of the bearings.
Article
Engineering, Mechanical
Tareq M. A. Al-Quraan, Fadi Alfaqs, Jamil Haddad, Viktor Vojtov, Anton Voitov, Andrey Kravtsov, Oleksandr Miroshnyk, Andrii Kondratiev
Summary: This paper proposes a methodology and integral parameter for estimating tribological properties of lubricants based on the analysis of testing standards. The developed method integrates various parameters to evaluate the effectiveness and application range of additives in lubricants. Laboratory tests demonstrate reproducibility and consistency of the testing method, with a coefficient of variation not exceeding 18%.
Article
Engineering, Mechanical
Ye Zhou, Caichao Zhu, Huaiju Liu, Houyi Bai, Xiaona Xu
Summary: The study investigates the effects of rolling-sliding and mild wear on contact fatigue behavior, finding that in rolling-sliding contact, the fatigue life is significantly lower compared to pure rolling due to an increase in the number and amplitude of stress microcycles. Mild wear tends to smooth the surface, subsequently reducing stress concentration, stress cycles, and the risk of surface contact fatigue.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Chemistry, Physical
Pawan Panwar, Emily Schweissinger, Stefan Maier, Stefan Hilf, Sofia Sirak, Ashlie Martini
Summary: This study investigates the impact of molecular chemistry and structure on performance metrics in lubricants using molecular dynamics simulations. The relationships between viscosity index, thickening efficiency, and traction coefficient with molecular properties are revealed through experimental validation and simulation calculations. Moreover, simple empirical models are developed based on the simulation results for rapid prediction of lubricant performance metrics.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
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
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
Philippe Amuzuga, Bruno Depale
Summary: This study characterizes the resistance to surface pitting of gears subjected to contact fatigue cycles. It was found that under specific operating conditions of low speed and grease lubrication, significant strain hardening occurred on the tooth flank surface and subsurface, resulting in enhanced material properties against pitting and increased load capacity.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
Jens E. Johansson, Mark T. Devlin, Jeffrey M. Guevremont, Braham Prakash
TRIBOLOGY TRANSACTIONS
(2020)
Article
Engineering, Mechanical
H. Torres, T. Caykara, H. Rojacz, B. Prakash, M. Rodriguez Ripoll
Article
Engineering, Mechanical
Tobias Hultqvist, Aleks Vrcek, Par Marklund, Braham Prakash, Roland Larsson
TRIBOLOGY INTERNATIONAL
(2020)
Article
Engineering, Mechanical
Daniel W. Gebretsadik, Jens Hardell, Braham Prakash
TRIBOLOGY INTERNATIONAL
(2020)
Review
Engineering, Mechanical
Yonggang Meng, Jun Xu, Zhongmin Jin, Braham Prakash, Yuanzhong Hu
Article
Engineering, Mechanical
P. Valizadeh Moghaddam, J. Hardell, E. Vuorinen, B. Prakash
Review
Engineering, Mechanical
Zhengjia Ji, Lin Zhang, Guoxin Xie, Wenhu Xu, Dan Guo, Jianbin Luo, Braham Prakash
Article
Engineering, Mechanical
P. Valizadeh Moghaddam, J. Hardell, E. Vuorinen, B. Prakash
TRIBOLOGY INTERNATIONAL
(2020)
Article
Engineering, Mechanical
Justine Decrozant-Triquenaux, Leonardo Pelcastre, Braham Prakash, Jens Hardell
Summary: This study focuses on the friction and wear behavior of aluminum alloys at high temperatures, showing that the formation of tribolayers can affect friction behavior, while adhesion-induced material transfer can impact tool life and product quality.
Article
Engineering, Mechanical
Pouria Valizadeh Moghaddam, Braham Prakash, Esa Vuorinen, Mikael Fallqvist, Jon M. Andersson, Jens Hardell
Summary: The reciprocating sliding wear tests were conducted on TiAlN coating against 316L stainless steel and carbide-free bainitic steel at temperatures of 40, 400 and 800 degrees C. The results showed that material transfer was more significant for the softer stainless steel at lower temperatures, while carbide-free bainite exhibited more material transfer at 800 degrees C. Friction coefficient increased for stainless steel with increasing temperature, but decreased for carbide-free bainite at elevated temperatures due to the formation of an easily sheared iron oxide layer. Additionally, the generation of a thin tribofilm containing aluminium oxide and oxidised transferred material could protect the TiAlN coating against wear at 800 degrees C in the case of stainless steel.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Justine Decrozant-Triquenaux, Leonardo Pelcastre, Cedric Courbon, Braham Prakash, Jens Hardell
Summary: This study aims to characterize the high temperature tribological behavior of selected PVD coatings and lubricants in sliding against aluminum alloy. The results showed that DLC and CrN coatings combined with the polymer lubricant were the most effective in reducing aluminum transfer.
Article
Engineering, Mechanical
Leonardo Pelcastre, Evan Kurnia, Jens Hardell, Justine Decrozant-Triquenaux, Braham Prakash
Summary: The use of hardfacing materials in press hardening tools can enhance durability and improve process economy, by depositing new material on the tool through welding. The friction stability of hardfacing materials is closely related to the temperature of the workpiece material, affecting the formation and structure of material transfer layers onto tool steels.
Article
Engineering, Mechanical
Juan Guillermo Zapata Tamayo, Marcus Bjorling, Yijun Shi, Braham Prakash, Roland Larsson
Summary: The study demonstrated that lubricating steel-steel contacts with Glycerol-water-glycol lubricant reduced mild wear and promoted micro-pitting as the main failure mode at low sliding levels compared to a commercial fully formulated gear oil. It was also observed that friction was significantly lower for the Glycerol-water and Glycerol-water-glycol lubricants, mainly due to a low pressure-viscosity coefficient.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Hector Torres, Tugce Caykara, Jens Hardell, Janne Nurminen, Braham Prakash, Manel Rodriguez Ripoll
Summary: Iron-based coatings with solid lubricants prepared by laser cladding can control friction and reduce tool wear during high-temperature metal forming. The addition of lubricious compounds helps to lower friction and wear, while microstructural and phase composition studies have been conducted on the coatings at high temperatures.
Article
Engineering, Mechanical
P. Valizadeh Moghaddam, M. Rinaudo, J. Hardell, E. Vuorinen, B. Prakash
