Article
Engineering, Chemical
Yinhu Xi, Marcus Bjorling, Andreas Almqvist
Summary: This work proposes a numerical model for three-dimensional rolling contact problems with one or two elastic layers, considering various creepages and employing the conjugate gradient method and the FFT technique for calculation efficiency. The numerical results are validated against existing results, showing significant modifications in traction and stick/slip results by adjusting layer parameters, which may be useful for improving rolling contact fatigue and mitigating wear problems in various mechanical systems.
Article
Mechanics
Peilin Fu, Jizhong Zhao, Xu Zhang, Hongchen Miao, Zefeng Wen, Guozheng Kang, Qianhua Kan
Summary: A three-dimensional tractive rolling contact analysis is conducted on functionally graded coating-substrate systems. The surface frictional anisotropy is described by Coulomb's orthotropic friction law, and the discontinuous transmissions of stress and displacement at the coating-substrate interface are modeled by a coupled dislocation-like and force-like interfacial imperfection. A multi-layered model is used to simulate the coating with arbitrarily varying thermo-elastic properties, and numerical methods are employed to obtain the thermo-elastic responses of tractive rolling contact. The results show the effect of friction coefficients and interfacial imperfections on traction and stress distribution.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
J. Gomez-Bosch, J. Giner-Navarro, J. Carballeira, L. Baeza
Summary: This paper presents a tangential contact theory that bridges the gap between simplified models and more realistic models, achieving high precision through the FastSim algorithm. It offers a solution for non-Hertzian contact and provides low error rates and shorter computational times.
VEHICLE SYSTEM DYNAMICS
(2023)
Article
Engineering, Mechanical
Gan-Yun Huang, Yi-Ran Li
Summary: Friction is a common phenomenon in daily life and production, which can be either detrimental or beneficial. This study investigated the friction behavior at microscale using the JKR model and analogy with dislocation emission at crack tips, and proposed a mechanical model for rolling adhesion.
EXTREME MECHANICS LETTERS
(2021)
Article
Mechanics
Yiping Wu, Chung Lun Pun, Pu Huang, Darrien Welsby, Peter Mutton, Anna Paradowska, Wenyi Yan
Summary: In heavy-haul railway systems, the high traction force in curved tracks accelerates rolling contact fatigue crack growth. However, there is limited research on the influence of creepage on this crack growth behavior. This paper proposes a numerical method to investigate non-proportional mixed-mode crack growth in the presence of severe creepage. Results show that lateral and spin creepages significantly affect the phase and magnitude of stress intensity factors, with spin creepage having a more detrimental effect.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mathematics, Applied
Aleksandar Obradovic, Zoran Mitrovic, Slavisa Salinic
Summary: This paper investigates the rolling motion of a heavy homogeneous ball on a rough surface, considering the sliding friction and determining the location of slipping. The method for calculating the reaction forces based on the contact point height is presented, and the conditions for preventing slipping are derived based on the system's mechanical energy and friction coefficient.
APPLIED MATHEMATICS AND COMPUTATION
(2022)
Article
Multidisciplinary Sciences
I. Gilavdary, S. Mekid, N. Riznookaya
Summary: This paper reports on the experimental measurement of friction moments during the pre-rolling phase with ultraprecision positioning. The experiments showed low rolling coefficients and the appearance of hysteresis curves depicting the dependence of friction moment on displacement.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
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
Luis Baeza, Stefano Bruni, Juan Giner-Navarro, Binbin Liu
Summary: With the increase in computational capacity, linear models have been replaced by non-linear formulations in wheel/rail tangential contact. However, linear formulations are still necessary for certain applications such as acoustic problem modeling. This work presents a new theory of unsteady linear tangential rolling contact for non-Hertzian areas, based on the Variational Theory, which allows for a more efficient and accurate solution to the contact problem.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Multidisciplinary
Qisheng Zheng, Jike Liu, Zhong-Rong Lu, Li Wang
Summary: This article proposes a novel equilibrium finite element method (EFEM) for solving frictional contact problems. The EFEM uses a traction-based equilibrium element to construct the discrete equilibrated stress field and recasts the Coulomb frictional contact problem into a linear complementarity problem (LCP). The equilibrated solution, combined with the compatible solution of the traditional FEM, can provide reliable error estimation for frictional contact within the framework of dual analysis.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Mechanical
Tshenolo Phinah Leso, Charles Witness Siyasiya, Roelf Johannes Mostert, Joseph Moema
Summary: The demand for railway services has increased, leading to higher speeds and axle loads. As a result, wheel and rail wear severity has increased. This study aimed to investigate the wear and rolling contact fatigue performance of class B wheels on R350HT and R260 rails under different slip ratios. The findings showed that wear severity was heavily influenced by the slip ratio. Additionally, the wear rate of class B wheels was found to be lower on R260 rail compared to R350HT rail. Three wear regimes, namely mild, severe, and catastrophic, were identified based on wear rate and wear index (T gamma/A).
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Michele Ciavarella, Luigi Romano, J. R. Barber
Summary: The problem of a wheel under tractive rolling of Carter is revisited here by considering slip-dependent friction force. By assuming a change from static to dynamic friction coefficient occurs over a small distance, a fracture mechanics solution for shear tractions is developed, which explains some aspects of falling friction creepage forces observed in experiments. The agreement with experimental results is discussed, suggesting the potential inclusion of rate-dependent effects in friction. Additionally, a simple strip theory is used to estimate the 3D effects, which result in reduced singularity strength at the edges and lower peak pressure.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Mechanics
Chu Zhang, Huimin Dong, Chuang Zhang, Delun Wang, Shudong Yu
Summary: This paper presents an effective node-to-surface contact scheme for handling three-dimensional quasi-static contact between deformable bodies with prescribed rigid body motion. Through testing and comparisons with standard solutions, the scheme's accuracy and efficiency were verified, demonstrating its versatility and effectiveness in mechanical system design.
Article
Engineering, Mechanical
Lin Jing, Xiongfei Zhou, Kaiyun Wang
Summary: A three-dimensional elastic-plastic theoretical analysis model of wheel-rail rolling contact was established, taking into account the plastic behavior and stress distribution in the contact area. The study found that plastic deformation leads to a decrease in the initial slope of the creep force/creepage curve, while increasing the saturation creepage. The strain rate effect increases the initial slope of the elastic-plastic creep force/creepage curve. The proposed theoretical model is of great significance to the damage assessment of high-speed wheel-rail systems.
ACTA MECHANICA SINICA
(2023)
Article
Multidisciplinary Sciences
Yuanzhe Li, Pengpeng Bai, Hui Cao, Lvzhou Li, Xinxin Li, Xin Hou, Jingbo Fang, Jingyang Li, Yonggang Meng, Liran Ma, Yu Tian
Summary: This study demonstrates a method based on stereo vision to measure three-dimensional traction stress with high spatial and temporal resolution. The method can be applied in various fields such as biology, physics, and robotics, and has important implications for related applications.
Article
Engineering, Chemical
Yao Qin, Yajing You, Guangzheng Jin, Wei Zhu, Yudan Zhu, Qiutian Wang, Xiaohua Lu, Yijun Shi
Summary: Molecular dynamics simulations reveal that the friction coefficient of glycerol aqueous solutions confined in nanoslits shows a nonlinear variation with increasing water content, with differences in lubrication behavior between hydrophobic graphene and hydrophilic FeO nanoslits primarily due to distinctive microstructures induced by surfaces with different hydrophilicity.
Article
Chemistry, Multidisciplinary
Jun Zhao, Tong Gao, Jie Dang, Weiyu Cao, Ziqi Wang, Shuangxi Li, Yijun Shi
Summary: This study successfully improved the lubrication and anti-wear performance of grease under high temperature and high load conditions by using modified talc nanosheets, providing guidance for developing natural lubricant additives and showing great potential in sustainable lubrication.
Article
Engineering, Mechanical
Weishan Long, Zhixiong Chen, Zhixiong Li, Grzegorz Krolczyk, Yijun Shi
Summary: This paper experimentally studied the tribological properties of hybrid bearings under oil lubrication and analyzed the microscopic morphology using an optical three-dimensional reconstruction method. The results showed that hybrid bearings have better friction performance compared to ordinary bearings, and a wear failure evaluation model was established.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2023)
Article
Engineering, Mechanical
Kalle Kalliorinne, Gustav Hinder, Joakim Sandberg, Roland Larsson, Hans-Christer Holmberg, Andreas Almqvist
Summary: In cross-country skiing races, slight reductions in aerodynamic drag and friction can determine the race outcome. The geometry of the ski greatly affects the friction between the skis and snow. By analyzing the normal force location corresponding to plantar pressure, the ski camber can be characterized while performing different tucking positions. It was found that leaning backwards in a tucking position reduces the risk of contact between kick wax and snow.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART P-JOURNAL OF SPORTS ENGINEERING AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Kalle Kalliorinne, Joakim Sandberg, Gustav Hinder, Roland Larsson, Hans-Christer Holmberg, Andreas Almqvist
Summary: In cross-country skiing competitions, small changes in resistive forces can significantly affect the results, highlighting the importance of understanding and measuring frictional properties. Research has shown that combining Artificial Neural Networks and deterministic methods can effectively predict the ski-camber profile under loading conditions and its macro-scale contact characteristics with snow.
Article
Nanoscience & Nanotechnology
Idiris Mehamud, Marcus Bjorling, Par Marklund, Yijun Shi
Summary: Vibration measurement systems are important for monitoring various equipment, but current sensor technologies have limitations in cost, design flexibility, and self-powering. Triboelectric nano-generator (TENG)-based vibration sensors have emerged as a possible alternative. This study develops a TENG-based vibration measurement device and self-powered alerting system with signal conditioning and data acquisition capabilities. Experimental results show successful signal measurement within a frequency range of 0-1800 Hz, while the TENG generates sufficient power for self-powering the system. The proposed device is cost-effective, small, and consumes less power compared to commercial devices.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Mechanical
Kalle Kalliorinne, Bo N. J. Persson, Joakim Sandberg, Gustav Hinder, Roland Larsson, Hans-Christer Holmberg, Andreas Almqvist
Summary: In winter sports, the contact between equipment and snow or ice generates resistive force. The contact between skis and snow at different scales has been studied, showing that ski base textures with higher S-pk values have smaller real contact area and a rougher surface performs better at high speed by reducing viscous friction.
Article
Chemistry, Multidisciplinary
Zhipeng Wu, Petter Paulsen Thoresen, Leonidas Matsakas, Ulrika Rova, Paul Christakopoulos, Yijun Shi
Summary: A novel, eco-friendly lignin-castor oil oleogel with superior lubricating and antioxidant properties was synthesized in this study. The oleogels exhibited remarkable performance in terms of oxidation resistance and lubricating properties compared to pure castor oil. The oleogel with 20wt % lignin had the lowest wear, which was approximately 64% lower than that of pure castor oil. With over 80% biomass content, these oleogels can serve as green lubricating greases for industrial applications. Overall, this study contributes valuable insights into the development of high-performance, eco-friendly lubricants.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Di Wang, Jun Zhao, Fan Zhang, Per Claesson, Jinshan Pan, Yijun Shi
Summary: A new coating wear monitoring method is developed based on a solid-liquid triboelectric nanogenerator (TENG), which generates electric signals corresponding to different wear states for easy monitoring of the coating's wear conditions without the need of any additional equipment.
Article
Chemistry, Physical
Ghulam Abbas, Gustav Johansson, Syed Muhammad Alay-e-Abbas, Yijun Shi, J. Andreas Larsson
Summary: In this study, quasi 3D porous tetragonal silicon-carbon polymorphs t(SiC)(12) and t(SiC)(20) are investigated for the first time using first-principles density functional theory calculations. The structural design of these polymorphs is based on armchair nanotubes of a tetragonal SiC monolayer with a paired configuration of C-C and Si-Si bonds. The results show that both polymorphs are thermally, dynamically, and mechanically stable, with the smaller polymorph having a small band gap and the larger polymorph displaying a Dirac nodal line semimetal. The 1D channels of these polymorphs can accommodate Na ions with excellent reversible theoretical capacities, indicating their potential suitability as anodes for Na-ion batteries.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Jun Chen, Par Marklund, Marcus Bjorling, Yijun Shi
Summary: Ice accumulation has a severe impact on social systems, and there is an urgent need for the development of durable anti-icing technologies. This research successfully formulated a hydrophobic coating based on graphene, which demonstrated excellent anti-icing properties in comprehensive field tests. The coating's micro-nano structure and semi-interpenetrating structure ensured its strength and hydrophobic behavior.
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Marko Tosic, Roland Larsson, Karsten Stahl, Thomas Lohner
Summary: This study investigates the elastohydrodynamic lubrication (EHL) between nonconjugate meshing tooth flanks of a worm gear. The contact is characterized by a slender elliptical shape and high sliding. A validated numerical EHL model considering non-Newtonian, thermal, and transient effects is used to analyze the complete contact area of the worm gear. The study identifies and discusses the design factors that influence EHL film formation in worm gears.
Article
Engineering, Mechanical
Jamal Choudhry, Roland Larsson, Andreas Almqvist
Summary: Wear is a complex phenomenon that is influenced by material and surface properties, operating conditions, and the surrounding environment. At the micro-scale, wear is the result of material removal due to plastic deformation and fracture. This study adopts a three-dimensional finite element model to simulate and investigate the main mechanisms of wear at the contacting asperities of a metal pair, taking into account thermal effects as well.
Article
Engineering, Mechanical
Andre Rudnytskyj, Roland Larsson, Carsten Gachot
Summary: This study uses the finite element method and wear model to model the dry linear reciprocating block-on-flat wear experiment, and investigates the influence of block surface and alignment on the results. The changes in geometric shape and contact pressure are quantified using an extrapolation scheme.
Article
Engineering, Mechanical
Jun Zhao, Yijiang Liu, Dengyu Liu, Yanfei Gu, Rao Zheng, Runmei Ma, Shuangxi Li, Yongfu Wang, Yijun Shi
Summary: This study investigates the tribological performance of metal-impregnated graphite, resin-impregnated graphite, and non-impregnated graphite under high temperature and high load. The results show that metal-impregnated graphite exhibits better anti-friction and anti-wear properties, reducing wear depth significantly. Impregnated materials enhance the strength of the graphite matrix and improve the formation of graphite tribofilm on the counterpart surfaces.
