Article
Engineering, Mechanical
A. Y. Wang, J. L. Mo, H. H. Qian, Y. K. Wu, Z. Y. Xiang, W. Chen, Z. R. Zhou
Summary: This study experimentally investigated the impact of a time-varying contact surface on friction-induced vibration and noise (FIVN) and surface wear performance. The results demonstrated that filling suitable materials into time-varying contact surfaces can effectively reduce FIVN and improve surface wear performance.
Article
Engineering, Mechanical
Fernando J. Alamos, Martin Philo, David B. Go, Steven R. Schmid
Summary: A pressing concern in superplastic forming (SPF) is the ability to quantitatively model to effectively design tooling and assess process viability. Current finite element method simulations for SPF generally do not include the evolutionary nature of friction under creep conditions. In this study, a new microcontact model of a rough surface in contact with a rigid flat surface is created to predict asperity flattening under creep behavior. Additionally, a semi-empirical equation is established to predict the real contact area and friction at different SPF conditions.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Jianjun Bian, Lucia Nicola
Summary: Experiments and simulations have shown that friction decreases significantly when graphene is used as a solid lubricant on various materials, but the impact of increasing the number of graphene layers on lubrication is controversial. Atomistic simulations in this study reveal that increasing the number of graphene layers can drastically reduce friction and change the deformation mechanism.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Jianjun Bian, Lucia Nicola
Summary: Results from molecular dynamics simulations show that covering the rough copper surface with a wrinkled graphene layer is the best solution for reducing friction.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Yi Wang, Liang Gang, Shuo Liu, Yi Cui
Summary: This paper proposes a fretting damage model based on fractal theory, with improved fitting accuracy using a neural network algorithm. It analyzes the fretting wear process of rough contact surfaces and suggests a generic program for three-dimensional fretting wear problems. The prediction error of the model is relatively low, making it suitable for practical application in predicting three-dimensional fretting wear.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Acoustics
G. Corradi, J-J Sinou, S. Besset
Summary: This paper presents an efficient reduction method for predicting nonlinear transient and steady state squeal events in mechanical systems, focusing on the Double Modal Synthesis (DMS) method. The study investigates the performance and convergence of the DMS method in predicting various aspects of squeal events.
Article
Green & Sustainable Science & Technology
Lei Xu, Hangtian Ni, Yi Zhang, Daquan Sun, Yunpeng Zheng, Mingjun Hu
Summary: In this study, a large amount of crumb rubber and waste cooking oil (WCO) were added to the asphalt binder to prepare high viscosity modified asphalt rubber. Sasobit and WCO were selected as viscosity-reducing additives to reduce the viscosity. The damping performance of the asphalt mixture was explored through temperature sweep test, dynamic creep test, and tire drop test. It was found that the addition of crumb rubber indirectly improved the damping performance of the asphalt mixture by increasing the asphalt-aggregate ratio. The impedance tube test results indicated that the air voids were critical in affecting the sound absorption performance of the asphalt mixture. The tire drop and pendulum instruments were used to simulate and test the vibration and friction noise of tire pavement, and it was found that the porous asphalt rubber mixture (PARM) mixed with WCO showed the best noise reduction effect.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Mechanical
Sheng Liu, Uditha De Silva, Da Chen, Andrew C. Leslie, Paul A. Meehan
Summary: Wheel squeal noise is a common problem in railway systems, especially on curved tracks. Previous investigations mostly focused on the squeal noise caused by falling friction, while the squeal noise caused by mode coupling was often missed. In this study, a two-wheel test rig with curved wheel profiles was designed to achieve adjustable contact angles with lateral components, and experimental and numerical modal analysis were conducted to explore the mode coupling effects. The results confirmed that the new squeal noise was indeed caused by mode coupling.
Article
Mechanics
Eylul Bilgin, Brian J. J. Cantwell
Summary: The universal velocity profile (UVP) for smooth pipes is extended to rough-wall pipe flows using data from pipe experiments. A correction to the smooth-wall UVP is formulated based on the roughness Reynolds number. The addition of a velocity correction and a new roughness transition function enables a good fit to the data, suggesting that the UVP can effectively represent rough-wall pipe flows with small errors comparable to smooth-wall cases.
Review
Engineering, Mechanical
Robert Ian Taylor
Summary: Amontons' law has been experimentally shown to hold true for more than 500 years, and researchers have studied the contact of rough surfaces under different deformation conditions. With the increasing focus on energy efficiency, research on mixed/boundary lubrication and friction prediction is becoming important.
Article
Materials Science, Multidisciplinary
Qiang Hao, Jian Yin, Yu Liu, Lu Jin, Shengfang Zhang, Zhihua Sha
Summary: Based on fractal theory and Hertz contact theory, this study constructs a 3-D fractal rough surface with random characteristics and derives the relationship between the wear deformation depth of the rough peak and its real contact area. Wear calculation models for worn and unworn surfaces are established, and the relationship between wear amount and surface topography change is characterized. By converting the 3-D rough surface into a 2-D discrete plane using image digitization technology, a time-varying wear calculation method for fractal rough surfaces is proposed. The simulation results are verified experimentally, showing the reduction of profile height and an average wear depth of 0.02 mm, and the analysis reveals the influence of friction parameters on surface topography.
Article
Engineering, Mechanical
Quan Wang, Zhiwei Wang, Jiliang Mo
Summary: In this research, the friction characteristics of a block-on-disc system with varying speed were experimentally investigated. A hybrid vibration form composed of low-frequency stick-slip and high-frequency intermittent unstable vibration, called stick-unstable sliding, was discovered at a relatively medium speed. Additionally, a mathematical model combining the negative friction-velocity slope (NFVS) and mode-coupling theories was established to analyze the friction-induced vibration (FIV) and noise mechanisms at different speed levels. The results highlight the influence of NFVS and mode-coupling on FIV at different speeds, with the coexistence of NFVS and mode-coupling leading to stick-unstable sliding at a medium speed.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Civil
Andrzej Dzierwa, Pawel Pawlus
Summary: The main objective of the study was to model wear of a disc subjected to dry contact with a ball in unidirectional sliding. Tribological tests were conducted, showing that wear volumes of the discs were influenced by the roughness heights of the surfaces, with a strong correlation between modeled and measured wear levels.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Acoustics
Gautam Kumar, Anindya Malas
Summary: The present article focuses on suppressing mode-coupling instability in frictional systems by proposing the use of resonant velocity feedback control. The efficacy of the control is demonstrated through linear stability analysis and optimization of control parameters. The robustness analysis shows that the control is able to effectively mitigate the instability even under parametric perturbations, and the controlled system is validated through simulations and analysis of nonlinear dynamics.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Acoustics
Zilin Li, Huajiang Ouyang, Zon-Han Wei
Summary: This study clarifies the subtle role of damping in the instability of FiV, demonstrating that increasing non-proportional damping can improve stability and even surpass the effect of proportional damping. Additionally, the influence of different damping distributions on the stability of a 4-DoF slider belt model is explored, showing the importance of the ratio of horizontal to vertical damping in system components. These findings are applicable to general linear second-order dynamic systems with asymmetric stiffness matrices.
JOURNAL OF SOUND AND VIBRATION
(2021)
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)