Friction最新文献_第3页

Robust insensitivity of heterogeneous charge distribution and interlayer friction to strong external electric fields in twisted graphene bilayers 扭曲石墨烯双层中非均质电荷分布和层间摩擦对强外电场的不敏感性

IF 6.8 1区工程技术

Friction Pub Date : 2026-09-02 DOI: 10.26599/frict.2026.9441309

Hao Li,Wanlin Guo,Yufeng Guo

{"title":"Robust insensitivity of heterogeneous charge distribution and interlayer friction to strong external electric fields in twisted graphene bilayers","authors":"Hao Li,Wanlin Guo,Yufeng Guo","doi":"10.26599/frict.2026.9441309","DOIUrl":"https://doi.org/10.26599/frict.2026.9441309","url":null,"abstract":"Abstract Twisted graphene bilayers exhibit rich physical phenomena under external fields, yet the coupled effect of electric fields and interlayer sliding on their charge distribution remains elusive. By combining first-principles calculations with a machine learning technique, we systematically investigate interlayer sliding-induced charge transfer and redistribution in both twisted and AB-stacked graphene bilayers under vertical electric fields. Unlike the homogeneous charge distribution observed in AB-stacked bilayers, the heterogeneous charge distribution in certain twisted graphene bilayers exhibits robust insensitivity to applied electric fields, even under strong fields up to 2 V/nm. This field insensitivity enables such twisted bilayers to maintain ultralow interlayer friction under extreme bias conditions. To quantitatively describe the coupled effect of interlayer sliding and electric fields on interlayer charge transfer and friction, we develop a charge-modified registry index (RICM) model for graphene bilayers. The revealed electric-field insensitivity in specific twisted configurations can be mainly attributed to the inherently small variation in the maximum registry index change (∆RICM) under bias, providing a simple descriptor for designing low-friction interfaces in electrically gated graphene devices.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"8 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148894783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Excellent current-carrying tribological performance of liquid-like carbon dots in lubricating grease 润滑脂中液态碳点具有优异的载流摩擦学性能

IF 6.8 1区工程技术

Friction Pub Date : 2026-09-02 DOI: 10.26599/frict.2026.9441308

Wanqing Bai,Haocheng Wang,Yi Li,Xin Quan,Songwei Zhang,Guangbin Yang,Shengmao Zhang,Litian Hu

引用次数: 0

Toward machine-learning-based interpretation of tribological deformation patterns in molecular dynamics data 基于机器学习的分子动力学数据中摩擦学变形模式的解释

IF 6.8 1区工程技术

Friction Pub Date : 2026-09-01 DOI: 10.26599/frict.2026.9441269

Hendrik J. Ehrich,Marvin C. May,Stefan J. Eder

{"title":"Toward machine-learning-based interpretation of tribological deformation patterns in molecular dynamics data","authors":"Hendrik J. Ehrich,Marvin C. May,Stefan J. Eder","doi":"10.26599/frict.2026.9441269","DOIUrl":"https://doi.org/10.26599/frict.2026.9441269","url":null,"abstract":"Abstract Molecular dynamics (MD) simulations are widely used to study tribological deformation at the atomic scale, but translating the resulting high-dimensional data into interpretable deformation pattern maps remains a largely manual and resource-intensive task. In this work, we present a data-driven workflow that aims to automate this process using unsupervised and supervised machine learning techniques. Grain-orientation-colored tomographic images from CuNi alloy simulations were first compressed into a 32-dimensional representation using an autoencoder, demonstrating that microstructural features can be retained under strong dimensionality reduction. The predictive model was trained independently using a dual-branch CNN–MLP architecture that combines image data with simulation metadata to classify dominant deformation patterns (transient and final states). The model achieves > 95% accuracy on spatially independent validation data. To assess generalization, entire simulations were excluded from training, yielding 100% final-state accuracy, as these conditions lie distant from regime boundaries. Evaluation on an artificial pressure–composition grid results in 87% accuracy, with misclassifications concentrated near regime boundaries. For transient states, the model achieves 68% accuracy on unseen simulations, increasing to > 92% when accounting for physically plausible misclassifications between adjacent regimes. A comparison with an image-only ResNet-50 model (~70% accuracy on spatially independent data, ~50% on unseen simulations) highlights the importance of integrating metadata. These results demonstrate that tribological deformation mechanisms can be automatically identified from microstructural data. This work provides a proof of concept for data-driven construction of deformation maps and represents a step toward predictive frameworks that may reduce reliance on large-scale MD simulations.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"214 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148894829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Friction and wear behaviors of steel wire ropes sliding against drum flanges in offshore drilling hoisting systems 海上钻井提升系统中钢丝绳与卷筒法兰滑动的摩擦磨损特性

IF 6.8 1区工程技术

Friction Pub Date : 2026-08-31 DOI: 10.26599/frict.2026.9441285

Hailang Chong,Dagang Wang,Linlin Wang,Zhijian Liu,Dongmei Zhang,Zhanrong Chen,Wei Ji,Jianghao Chen,Haiyan Deng,Shirong Ge

{"title":"Friction and wear behaviors of steel wire ropes sliding against drum flanges in offshore drilling hoisting systems","authors":"Hailang Chong,Dagang Wang,Linlin Wang,Zhijian Liu,Dongmei Zhang,Zhanrong Chen,Wei Ji,Jianghao Chen,Haiyan Deng,Shirong Ge","doi":"10.26599/frict.2026.9441285","DOIUrl":"https://doi.org/10.26599/frict.2026.9441285","url":null,"abstract":"Abstract The time-dependent mechanical behavior of hoisting wire ropes on offshore drilling platforms can cause repeated contact and relative sliding between the steel wire rope and the drum flange during interlayer transition. In marine service environments, seawater exposure and lubrication conditions may further influence the tribological behavior of the rope−flange contact pair, thereby affecting the load-bearing safety of the hoisting system. In this study, friction and wear tests were performed on a steel wire rope–drum flange contact pair using a custom-built test rig. The effects of cycle number, environmental condition, contact load, and friction frequency on the friction coefficient, wear scar profile, volume loss, wear coefficient, and wear morphology were systematically investigated. Wear evolution and damage mechanisms were characterized by manual strand disassembly, three-dimensional profilometry, and scanning electron microscopy. The results show that the friction coefficient increases rapidly at the initial stage, then rises gradually, and finally fluctuates around a steady state with increasing cycle number. The steady-state friction coefficient decreases with increasing contact load and friction frequency. In contrast, the wear width, wear depth, maximum cross-sectional failure area, volume loss, and wear coefficient increase with cycle number and frictional parameters. The wear severity under different environmental conditions follows the order of air > seawater > grease + seawater > grease. These findings provide a basis for understanding the degradation behavior and optimizing maintenance strategies of steel wire rope–drum flange contact pairs in offshore drilling hoisting systems.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"379 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148894574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced electroadhesion via voltage removal protocol with interfacial sliding: Effects of material type and surface roughness 通过带界面滑动的电压去除方案增强电粘附：材料类型和表面粗糙度的影响

IF 6.8 1区工程技术

Friction Pub Date : 2026-08-28 DOI: 10.26599/frict.2026.9441273

Sang-Hoon Oh,Seung-Hoon Lee,Yoon-Sung Jo,Yingdan Wu,Jae-Kang Kim

{"title":"Enhanced electroadhesion via voltage removal protocol with interfacial sliding: Effects of material type and surface roughness","authors":"Sang-Hoon Oh,Seung-Hoon Lee,Yoon-Sung Jo,Yingdan Wu,Jae-Kang Kim","doi":"10.26599/frict.2026.9441273","DOIUrl":"https://doi.org/10.26599/frict.2026.9441273","url":null,"abstract":"Abstract Electroadhesion provides a reversible adhesion based on electrostatic attractive forces between a substrate and an electroadhesive pad, enabling the handling of various objects. Despite its structural simplicity and broad applicability, conventional electroadhesion systems often suffer from relatively low adhesive forces and strong performance variability depending on substrate properties, which limits their practical use. To address these limitations, this study proposes a new electroadhesion operating protocol that integrates voltage application, interfacial sliding, and subsequent voltage removal. Experimental results demonstrate that the proposed protocol increases pull-off force by up to 367% compared to the conventional operating method for metallic and ceramic substrates, with particularly pronounced enhancement on rough surfaces as well as in the low-voltage regime. Furthermore, the effects of voltage application conditions, surface roughness, and sliding conditions on adhesion performance were systematically investigated. The results reveal that adhesion enhancement is strongly governed by material and surface properties, with the most significant gains observed for rough metallic and ceramic substrates, while requiring only a single sliding cycle to achieve performance gains. Based on these findings, a robotic manipulation demonstration was conducted in which a robotic manipulator successfully transferred a 1,125 g glass plate for more than 20 consecutive cycles. This work presents an operating protocol for enhancing electroadhesion performance without modifying pad geometry or materials, with demonstrated effectiveness for metallic and ceramic substrates, providing a practical pathway toward improving the load-carrying capability and robustness of electroadhesion-based handling systems.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"64 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148895898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

U-Net-based hybrid framework for accelerating deterministic rough-surface mixed lubrication simulations 基于u - net的加速确定性粗糙表面混合润滑模拟的混合框架

IF 6.8 1区工程技术

Friction Pub Date : 2026-08-27 DOI: 10.26599/frict.2026.9441306

Filimonas Kaliafetis,Suhaib Ardah,James P. Ewen,Daniele Dini

{"title":"U-Net-based hybrid framework for accelerating deterministic rough-surface mixed lubrication simulations","authors":"Filimonas Kaliafetis,Suhaib Ardah,James P. Ewen,Daniele Dini","doi":"10.26599/frict.2026.9441306","DOIUrl":"https://doi.org/10.26599/frict.2026.9441306","url":null,"abstract":"Abstract Despite significant advances in deterministic mixed lubrication modelling, the computational complexity of these simulations remains prohibitive, limiting their practical use in rapid analysis and design optimisation. This study addresses this bottleneck by developing a hybrid machine learning framework that integrates artificial neural networks (ANNs) and convolutional neural networks (CNNs), specifically U-Nets, into a classical finite volume mixed lubrication solver to accelerate rough surface simulations without sacrificing fidelity. The approach uses ANNs to predict smooth pressure, film thickness, and temperature fields from operating conditions, while U-Nets reconstruct rough fields from smooth solutions and rough surface topographies. The ANNs achieve high accuracy for smooth fields, with mean values of 0.998 for pressure, 0.999 for film thickness, and 0.925 for temperature. The U-Nets generalise well to rough surfaces, achieving values of 0.990, 0.996, and 0.938 for pressure, film thickness, and temperature respectively. Six hybrid configurations are assessed, all of which reduce computational cost relative to the classical solver (average simulation time: 10.36 minutes). The most efficient framework delivers a 74.39% reduction in computation time across all testing samples. Overall, the results demonstrate that hybrid machine learning-physics frameworks can substantially accelerate deterministic mixed lubrication simulations while preserving high predictive accuracy.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"8 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2026-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148894581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Speed-controlled adhesive gripper 速度控制胶爪

IF 6.8 1区工程技术

Friction Pub Date : 2026-04-22 DOI: 10.26599/frict.2026.9441258

Lvzhou Li, Huan Wei, Xiangli Wen, Qingyue Li, Kai Zhu, Yu Tian, Jianning Ding

引用次数: 0

Liquid bridge morphology and adhesion force evolution in bearing: influence mechanisms and effects 轴承液桥形态与黏附力演化：影响机制与效应

IF 6.8 1区工程技术

Friction Pub Date : 2026-04-22 DOI: 10.26599/frict.2026.9441259

Jindao Guo, Ke Yan, Mingkai Wang, Jiannan Sun, Bin Fang, Fei Chen, Jun Hong

引用次数: 0

Tree-frog inspired friction pads provide positive curved contact performance in wet environment 树蛙式摩擦垫在潮湿环境中提供积极的弯曲接触性能

IF 6.8 1区工程技术

Friction Pub Date : 2026-04-22 DOI: 10.26599/frict.2026.9441256

Keju Ji, Xiaolei Zhu, Jian Chen, Jiahui Zhao, Jianming Wu, Xinran Xu, Wenjie Chen, Haixiang Ma, Zhiyong Hu, Jun Sun, Zhendong Dai

{"title":"Tree-frog inspired friction pads provide positive curved contact performance in wet environment","authors":"Keju Ji, Xiaolei Zhu, Jian Chen, Jiahui Zhao, Jianming Wu, Xinran Xu, Wenjie Chen, Haixiang Ma, Zhiyong Hu, Jun Sun, Zhendong Dai","doi":"10.26599/frict.2026.9441256","DOIUrl":"https://doi.org/10.26599/frict.2026.9441256","url":null,"abstract":"There are numerous bionic gripping ends adapted to different environments, but stable gripping for curved objects in wet environments is still an urgent engineering challenge. In this study, inspired by the biological properties of tree frogs, a bionic friction pad with an inner concave micropillar surface (CMF-Pad) is proposed. Through the analysis of Hertzian contact theory, the optimization mechanism of the concave surface on the contact area is revealed, and the critical curvature range of the micropillar array to guarantee the drainage performance is deduced. Experiments have confirmed that CMF-Pad exhibit significant advantages in wet environments (≥10 mg/cm2 liquid film environment), its micro-channels can actively drain interfacial fluids to enhance friction, and its transverse friction is increased by about 40% compared with flat/smooth friction pads; Simultaneously, it possesses excellent curved surface adaptation and torsion resistance. In the smooth surface contact life test, the CMF-Pad maintained more than 90% of its initial friction after 10,000 cycles of contact testing. Concurrently, practical applications have verified the stability of the friction pads when gripping, handling and twisting curved objects such as medical reagent bottles by robotic arms, enables reliable manipulation in liquid-mediated interfaces through dual mechanisms: active drainage and curvature-conformal contact, providing a different solution for humid environment operation in semiconductor processing, medical equipment handling and other fields.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"19 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147732335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Achieving low friction and wear in superhard TiCx coatings on GCr15 steel via ti-induced graphitization and TiO2 stabilization 通过钛诱导石墨化和TiO2稳定实现GCr15钢超硬TiCx涂层的低摩擦磨损

IF 6.8 1区工程技术

Friction Pub Date : 2026-04-22 DOI: 10.26599/frict.2026.9441257

Lilin Jiang, Yongming Zhu, Qian Jia, Pangfeng Yang, Weiye Li, Bin Zhang

{"title":"Achieving low friction and wear in superhard TiCx coatings on GCr15 steel via ti-induced graphitization and TiO2 stabilization","authors":"Lilin Jiang, Yongming Zhu, Qian Jia, Pangfeng Yang, Weiye Li, Bin Zhang","doi":"10.26599/frict.2026.9441257","DOIUrl":"https://doi.org/10.26599/frict.2026.9441257","url":null,"abstract":"Ti-based carbon coatings are promising for low-friction and wear-resistant applications, but their performance on steel substrates is often limited by poor adhesion, high residual stress, and unstable tribological behavior under ambient conditions. In this work, TiCx coatings were deposited on GCr15 bearing steel using a hybrid strategy combining magnetic filtered cathodic arc ion sputtering and magnetron sputtering. Dense Cr/CrN/CrTiN/TiCN graded interlayers ensured strong adhesion and a smooth mechanical transition to the substrate, while the TiCx top layer was tuned via the carbon target DC current. The TiCx-1 coating, deposited at 4 A, exhibits an exceptional hardness of 43 GPa and a low friction coefficient of ⁓0.18, demonstrating a superior combination of elastic-plastic properties and wear resistance. Structural analyses reveal that increasing DC current promotes sp2 carbon formation and graphitization, while Ti incorporation facilitates TiC reinforcement and the in-situ generation of TiO2 during sliding. Tribological tests, Raman and FIB-HRTEM observations confirm that friction and wear are dominated by the formation of a stable graphitized transfer film supported by TiO2, which reduces shear stress and stabilizes the sliding interface. However, excessive carbon enrichment at higher currents destabilizes the transfer film and degrades mechanical integrity, leading to higher friction and wear. These results highlight the synergistic roles of interfacial architecture, carbon bonding evolution, and Ti-assisted tribochemistry in governing the tribological performance of TiCx coatings. This study provides a novel design strategy and fundamental insights for developing superhard, low-friction coatings for steel components under ambient conditions.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"79 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147732332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0