Article
Multidisciplinary Sciences
Denys Baranovskyi, Sergey Myamlin
Summary: The paper explores the potential for self-organization processes in the tribosystems of diesel engines. It introduces a criterion for determining the possibility of self-organization processes in the second-level subsystems of the tribosystems, indicating a decrease in the flow of mechanical energy in real irreversible processes. The study considers three cases of self-organization process development in the crankshaft-insert tribosystem of a diesel engine 10D100. It concludes that in order to reduce wear rate, it is necessary to facilitate energy-mass transfer on contacting surfaces through gradients of chemical potentials and dislocation density.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Mechanical
Osama Brinji, Khosro Fallahnezhad, Paul A. Meehan
Summary: The experiments investigated the effects of normal pressure, sliding amplitude, and oscillating sliding frequency on friction, wear coefficient, and threshold energy for wear activation in 52100 high carbon bearing quality steel during a false brinelling test. The results showed that changes in normal pressure and sliding amplitude affected the friction and wear coefficients, while oscillating sliding frequency had little influence. Different conditions did not significantly impact the threshold energy for wear activation.
Article
Chemistry, Multidisciplinary
Yun Dong, Weibin Hui, Zhiyuan Rui, Yusong Ding, Fangming Lian, Yi Tao
Summary: This study reveals the phonon mechanism of angle-dependent superlubricity between black phosphorus layers based on molecular dynamics simulations and quantum theories. Friction exhibits 180° periodicity with the highest friction at 0° and 180° and lowest at 90°. Thermal excitation reduces friction at 0° due to thermal lubrication, while high temperature increases friction at 90° due to thermal collision. Phonon spectra show that energy dissipation channels can be formed at the interface with 0°, enhancing dissipation efficiency, whereas these channels are destroyed at 90°, hindering frictional dissipation.
Article
Chemistry, Multidisciplinary
Zaoqi Duan, Zhiyong Wei, Shuyu Huang, Yongkang Wang, Chengdong Sun, Yi Tao, Yun Dong, Juekuan Yang, Yan Zhang, Yajing Kan, Deyu Li, Yunfei Chen
Summary: Frictional energy dissipation involves generation of excess phonons at multiple resonant frequencies due to nonlinear interactions between a sliding tip and a substrate, leading to multiple peaks in the friction force as the tip sliding velocity ramps up. These observations reveal previously unrecognized energy dissipation channels associated with tip vibration.
Article
Engineering, Manufacturing
Zhennan Zhang, Fabrizio Scarpa, Brett A. Bednarcyk, Yanyu Chen
Summary: This study explores lattice metamaterials with fractal cuts that feature energy dissipation mechanisms through structural sliding friction and material damping, leading to enhanced bending compliance and shape recoverability. The research suggests that fractal lattice metamaterials have unique energy dissipation properties and potential applications in various industrial sectors such as defense, energy, and transportation.
ADDITIVE MANUFACTURING
(2021)
Editorial Material
Engineering, Chemical
S. Yu. Krylov
Summary: In their study, Wei et al. found that the maxima in the energy dissipation rate in a two-layer graphene system can be attributed to a resonance between the excited phonons and the natural frequencies of the system vibrations. However, this hypothesis may not be justified as the maxima can be explained by a more general mechanical resonance that applies to any type of dissipation mechanism.
Review
Engineering, Mechanical
Huan Liu, Boming Yang, Chong Wang, Yishu Han, Dameng Liu
Summary: Friction energy dissipation has a significant impact on global energy consumption and economic losses. Understanding the mechanism of friction energy dissipation and finding ways to reduce it are of great importance.
Article
Engineering, Mechanical
Pranay Vinayak Likhar, Adarsh Divakaran, Satish Kailas
Summary: This article introduces a parallel pendulum tribometer designed for experiments at lower sliding speeds. The tribometer overcomes stiffness-related issues and has a higher resolution. The experimental results show that HDSA is more effective in reducing friction at lower sliding velocities compared to HD.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Civil
B. Namorado, A. Pinto da Costa, F. M. F. Simoes
Summary: This study investigates the dynamic response of frames equipped with anti-seismic rotational friction dampers. The Non-Smooth Dynamics method (NSD) algorithm, specifically designed for the numerical simulation of non-smooth dynamical systems, is utilized to efficiently handle the non-smooth nature of the friction law. Numerical computations are conducted to analyze different frames subjected to harmonic excitation or the ground acceleration history of the El Centro earthquake. The results show that the optimal range for the maximum moment at the frictional hinge is wide and relatively independent of the number of floors. The presence of friction dampers leads to a significant reduction in relative displacements and absolute accelerations of the floors.
ENGINEERING STRUCTURES
(2022)
Review
Chemistry, Physical
Jianbin Luo, Min Liu, Liran Ma
Summary: Friction is a phenomenon that exists extensively in nature and industry, with both necessary and beneficial aspects in daily life and energy scavenging. Scientists have long worked on the origin of friction and developed new techniques like superlubricity to achieve ultralow friction and reduce energy dissipation.
Article
Engineering, Civil
Ke Ke, Yonghui Chen, Xuhong Zhou, Michael C. H. Yam, Shuling Hu
Summary: This paper presents an experimental and numerical study of a novel brace-type hybrid damper enhanced by the friction mechanism. The test results showed multiple yielding stages and dependent hysteretic response curves. The numerical investigation confirmed the energy dissipation mechanism and improvement in energy dissipation capacity and ductility. A theoretical prediction model was also developed to facilitate the practical design of the hybrid damper.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Francesco Boggian, Angelo Aloisio, Roberto Tomasi
Summary: This paper presents experimental tests and modeling attempts for a type of Asymmetric Friction Connections (AFCs) within the European project e-SAFE. The AFCs are part of the seismic retrofitting solution e-CLT, which involves installing Cross-Laminated Timber (CLT) panels in reinforced concrete structures using friction connections. The authors conducted experimental tests and developed a modified LuGre hysteresis model to simulate the behavior of the tested specimens.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2022)
Article
Engineering, Mechanical
Douglas Monteiro Andrade, Felipe Bastos de Freitas Rachid, Arris Sieno Tijsseling
Summary: This study extends a quasi-2D flow model to accommodate fluid-structure interaction mechanisms in elastic pipes. The proposed model accurately analyzes energy transfer and dissipative effects in the fluid-pipe system and offers a better description of the friction coupling mechanism. It also reveals uneven shear stress distributions in unsteady flow, capturing energy dissipation with accuracy.
JOURNAL OF FLUIDS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Gang Hu, Jianbo Ma, Guangjie Yuan, Kunrong Shen, Haoyu Wang
Summary: The tribological properties of hydrogenated nitrile butadiene rubber under different lubricated conditions were investigated, and the wear mechanisms and energy dissipation sources were identified.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Liqiang Zhang, Haifang Cai, Liang Xu, Li Ji, Daoai Wang, Youbin Zheng, Yange Feng, Xudong Sui, Yufeng Guo, Wanlin Guo, Feng Zhou, Weimin Liu, Zhong Lin Wang
Summary: In this study, a new macroscale superlubric triboelectric nanogenerator (SL-TENG) was developed to achieve ultra-low friction and wear under high-contact stress. The SL-TENG showed high power density and output current, and the ultralow friction on the hydrogenated surface was identified as the key factor. The SL-TENG demonstrated the ability to light up LEDs without rectification and enable online friction monitoring and early warning.
