Friction最新文献_第3页

Study on wear performance and mechanism of pantograph contact strip that contact with damaged contact wire under ambient humidity

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-20 DOI: 10.26599/frict.2025.9441101

Xingshuai Zhi, Ning Zhou, Yao Cheng, Haifei Wei, Yongming Yao, Weihua Zhang, Guangxiong Chen

{"title":"Study on wear performance and mechanism of pantograph contact strip that contact with damaged contact wire under ambient humidity","authors":"Xingshuai Zhi, Ning Zhou, Yao Cheng, Haifei Wei, Yongming Yao, Weihua Zhang, Guangxiong Chen","doi":"10.26599/frict.2025.9441101","DOIUrl":"https://doi.org/10.26599/frict.2025.9441101","url":null,"abstract":"Studies have focused on the significant impact of contact wire damage on the abnormal wear of pantograph contact strips. Initially, based on field data analysis, identify the most common types of contact wire damage. Subsequently, experiments and wear performance analysis of contact strip that contact with damaged contact wire were conducted under high and low humidity, respectively. Finally, correlation analysis was employed to explore the influence of various factors on strip wear performance. The results indicate that excessive wear occurs on the contact strip with pitted contact wire (PC), particularly under low humidity, where the strip wear rate is 2.2 times higher than that contact with normal contact wire (NC). While contact with PC, the primary wear mechanisms of the contact strip include material transfer and arcing ablation under high humidity, but involve material transfer, arcing ablation, and microcutting under low humidity. Correlation analysis results show that under low humidity, the parameters related to PC have the greatest impact on the wear rate of the contact strip, with a significant increase in mechanical wear proportion. Based on these findings, it can be concluded that both contact wire damage and reduced humidity contribute to more severe abnormal wear of the contact strip, with the influence of PC conditions being more excessive wear than that of reduced humidity on wear performance.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"40 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143660455","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

Atomistic study of material removal behavior during ultrasonic vibration-assisted nanoscratching of single-crystal AlN

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-18 DOI: 10.26599/frict.2025.9441097

Shuaicheng Feng, Jian Guo, Jiaqin Yin, Hanqiang Wu, Linmao Qian, Chen Xiao

{"title":"Atomistic study of material removal behavior during ultrasonic vibration-assisted nanoscratching of single-crystal AlN","authors":"Shuaicheng Feng, Jian Guo, Jiaqin Yin, Hanqiang Wu, Linmao Qian, Chen Xiao","doi":"10.26599/frict.2025.9441097","DOIUrl":"https://doi.org/10.26599/frict.2025.9441097","url":null,"abstract":"Molecular dynamics simulations were used to investigate surface material removal and subsurface damage at nanoscale to atomic-scale during ultrasonic vibration-assisted (UVA) nanoscratching of monocrystalline AlN with a single-point diamond tip. Simulation results suggest UVA-scratching exhibits lower tangential force, normal force, and friction coefficient under the same scratching depth as ordinary scratching. UVA-scratching demonstrates stronger material removal than ordinary scratching due primarily to the vibration-induced rise of the local temperature to facilitate atomic bond breakage and lateral extension of stacking faults in the superficial layer. Uniform monolayer removal consisting of the outermost Al atoms and the connected N atoms is easier to achieve in the scratching path with UVA-scratching mode than with the ordinary scratching mode. UVA-scratching produces a smoother scratched surface. For instance, the root mean square of the surface after UVA-scratching is only about one-third of that after ordinary scratching at the same scratching depth. Furthermore, utilizing ultrasonic vibration can reduce scratching-induced material pile-up and the subsurface damage primarily consisting of dislocations and stacking faults. This is because vibration can reduce the stress distribution range and restrain stress concentration. This work can provide useful knowledge for high-quality and efficient ultra-precision surface machining for hard-brittle materials.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"194 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640343","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

Synthesis of nature inspired, phosphorylcholine moieties and poly(ethylene oxide) brushes containing copolymers which synergise steric repulsion and hydration lubrication for articular cartilage

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-18 DOI: 10.26599/frict.2025.9441095

Marijus Jurkūnas, Ke Ren, Vaidas Klimkevičius, Prashant K Sharma, Ričardas Makuška

{"title":"Synthesis of nature inspired, phosphorylcholine moieties and poly(ethylene oxide) brushes containing copolymers which synergise steric repulsion and hydration lubrication for articular cartilage","authors":"Marijus Jurkūnas, Ke Ren, Vaidas Klimkevičius, Prashant K Sharma, Ričardas Makuška","doi":"10.26599/frict.2025.9441095","DOIUrl":"https://doi.org/10.26599/frict.2025.9441095","url":null,"abstract":"Inspired by nature, a hydrophilic diblock brush copolymers containing both phosphorylcholine groups and PEO side chains were synthesized by successive RAFT polymerization of the zwitterionic monomer 2-methacryloyloxyethyl phosphorylcholine (MPC) and PEO-containing macromonomer poly(ethylene oxide) methyl ether methacrylate (PEOMEMA) for the first time.  Lubricating effect of several diblock brush copolymers and one gradient copolymer of MPC and PEOMEMA was evaluated by tribological measurements in the systems PDMS–glass and cartilage–glass which were placed in PBS solutions of the polymers. The best lubrication was provided by the diblock copolymer with relatively long pMPC block and the copolymer of gradient structure. Average dynamic coefficient of friction (COF) in the system PDMS–glass at concentration of the copolymers 0.4 mg/ml was only 0.004– 0.007, while COF values of the copolymers in the system cartilage-glass after 450 cycles of sliding 0.06–0.07. Excellent lubrication effect of the diblock and gradient copolymers of MPC and PEOMEMA is attributed to hydration lubrication provided by pMPC synergistically combined with steric repulsion provided by PEOMEMA. Entrapment of diblock brush copolymers between sliding surfaces was sufficient to provide the lubrication effect. This enhances the efficacy of the diblock brush copolymers as potential additives for intraarticular injections.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"18 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640341","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

Synergistic effects of oleic acid modified TiO2 and alkyl polysulfide in forming extreme pressure tribo-films: A mechanistic study

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-18 DOI: 10.26599/frict.2025.9441098

Kai Zeng, Hongfei Shi, Liang Cheng, Li Zhang, Liang Feng, Hengyi Lu, Wenjing Hu, Jiusheng Li

{"title":"Synergistic effects of oleic acid modified TiO2 and alkyl polysulfide in forming extreme pressure tribo-films: A mechanistic study","authors":"Kai Zeng, Hongfei Shi, Liang Cheng, Li Zhang, Liang Feng, Hengyi Lu, Wenjing Hu, Jiusheng Li","doi":"10.26599/frict.2025.9441098","DOIUrl":"https://doi.org/10.26599/frict.2025.9441098","url":null,"abstract":"The synergistic effect of nanoparticles (NPs) with alkyl polysulfides represents a promising avenue for the enhancement of extreme pressure (EP) performance in lubricants, potentially reducing the reliance on sulfur-containing additives. However, the underlying synergistic mechanism remains unclear. In this study, oleic acid-modified titanium dioxide (TiO2-OA) NPs and dialkyl pentasulfide (DPS) formed a mechanically interlocked EP tribo-film with a maximum thickness of about 1.4 μm, demonstrating excellent load-bearing capabilities up to 7,256 N (6.1 GPa). Under conditions of EP friction, the addition of TiO2-OA NPs facilitates the development of a robust tribo-film of substantial thickness, which in turn bolsters the load-bearing capability of the lubricating oil. Surface analysis of EP wear scars using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS) showed that TiO2-OA NPs were rapidly deposited and enriched at the friction interface with increasing load (3,530-7,256 N) and friction time (0-10 s), which in turn compensated in-situ the wear generated by extreme shear. Cross-sectional analysis of EP wear scars indicates that the preferential formation of ferrous sulfide (FeS) and subsequent rapid enrichment and mechanical interlocking of TiO2-OA NPs are essential for preventing welding and improving EP performance. The study presents novel insights into the synergistic mechanisms of NPs with sulfur-containing additives, advancing the widespread implementation and progress of NPs in the field of tribology.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"55 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640344","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

Recent development in understanding the role of lipids in cartilage lubrication

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-18 DOI: 10.26599/frict.2025.9441014

Yumeng Xue, Xiaolian Niu, Jin Zhou, Lizhen Wang, Yubo Fan

{"title":"Recent development in understanding the role of lipids in cartilage lubrication","authors":"Yumeng Xue, Xiaolian Niu, Jin Zhou, Lizhen Wang, Yubo Fan","doi":"10.26599/frict.2025.9441014","DOIUrl":"https://doi.org/10.26599/frict.2025.9441014","url":null,"abstract":"Lubrication deficiency in articular cartilage (AC) triggers irreversible and progressive degradation of AC, termed osteoarthritis (OA). Bio-lubrication-based strategies have been proposed as effective ways to restore temporary cartilage lubrication for OA postponement or even OA healing. The design of lubricants has inspired an exploration of the reasons behind the low friction in cartilage and the components responsible for the lubrication function in cartilage. Recently, lipids, as emerging lubrication components in AC, have been extensively studied and confirmed to play essential roles in maintaining cartilage lubrication. This review brings forward the main challenges of establishing a satisfactory functional articular cartilage biomaterial with sufficient lubrication from the perspectives of the complexity of physiology and microenvironment of osteochondral tissue. Next, we comprehensively discuss lubrication models of AC, including the lubrication mechanism of AC, OA associated with lipids, lipid lubrication mechanism and application, and the synergistic effects of phospholipids in lubrication. In particular, we highlight the advantages and application of lipids and their derivatives in lubrication. Finally, we analyze the future prospects of lipid-based biomaterials to achieve the perfect treatment of OA. This comprehensive and instructive review can provide deep insights into our current understanding of lipids and lubrication-related diseases.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"16 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640346","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

Mixed and thermal elastohydrodynamic simulation of a low-loss gear considering the gear system

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-18 DOI: 10.26599/frict.2025.9441096

Felix Farrenkopf, Thomas Lohner, Karsten Stahl

引用次数: 0

Hydrophobic soft cone-assisted rolling robot inspired by sea urchin for gastrointestinal tract delivery

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-18 DOI: 10.26599/frict.2025.9441099

Shenglin Yang, Yixuan Yang, Hongyuan Li, Jie Li, Yunrui Chen, Lin Xu, Bingsuo Zou, Yabin Zhang, Ben Wang

{"title":"Hydrophobic soft cone-assisted rolling robot inspired by sea urchin for gastrointestinal tract delivery","authors":"Shenglin Yang, Yixuan Yang, Hongyuan Li, Jie Li, Yunrui Chen, Lin Xu, Bingsuo Zou, Yabin Zhang, Ben Wang","doi":"10.26599/frict.2025.9441099","DOIUrl":"https://doi.org/10.26599/frict.2025.9441099","url":null,"abstract":"Miniature soft robots have evolved into various therapeutic applications due to good adaptability. Nonetheless, complex terrains inside body, especially soft wrinkled topography with non-Newtonian viscous mucus in the gastrointestinal tract, pose a strict demand on the navigation of such robots. To address the challenge, here a design inspiration derived from sea urchin is proposed to fabricate the soft-cone-assisted rolling robot (SCARBot) by encapsulating blood coagulation gel, creating a hollow cylindrical structure for loading drugs inside. The arrangement of an array of soft cones with manually designed hydrophobicity allows for controlled locomotion of the robots under low-frequency magnetic field, significantly reducing surface friction and improving environmental adaptability. This motion ability is further supported by US-imaging-guided navigation in an ex vivo and even in vivo gastrointestinal tract. When the high-frequency magnetic field is exerted, the drug-loaded blood coagulation gel sealed inside the robot melts by magnetothermal effect, thereby releasing drugs at the targeted location. The synergy of magnetothermal and pharmacological therapy enable this robot to exhibit enhanced antibacterial efficiency for ex vivo and in vivo bacterial infection and inflammation. Such soft robots with exceptional adaptability and therapeutic functions offer high potential for targeted delivery and therapy through lumens inside body.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"100 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640345","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

Contact fatigue limit prediction method for heavy-duty gears considering hardness gradient characteristics

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-18 DOI: 10.26599/frict.2025.9441019

Boyu Zhang, Yongyong He, Zhengwei Wang

引用次数: 0

Scratch-induced work hardening of an atomically flat bulk metallic glass by stress-driven structural ordering

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-18 DOI: 10.26599/frict.2025.9441100

Jianping Lai, Mengli Liu, An Zhang, Amit Datye, Udo D Schwarz, Fan Zhao, Fei Zhao, Jiaxin Yu

{"title":"Scratch-induced work hardening of an atomically flat bulk metallic glass by stress-driven structural ordering","authors":"Jianping Lai, Mengli Liu, An Zhang, Amit Datye, Udo D Schwarz, Fan Zhao, Fei Zhao, Jiaxin Yu","doi":"10.26599/frict.2025.9441100","DOIUrl":"https://doi.org/10.26599/frict.2025.9441100","url":null,"abstract":"Although the enhanced structural relaxation is usually believed to be an important contributor to work hardening of metallic glasses subjected to triaxial stress state, an direct observation of relaxation process in response to work hardening has not been achieved in metallic glasses. Here we show that by nanoscratching on an atomically flat bulk metallic glass surface, the small atomic force microscopy tip with a radius of ≈ 10 nm brings about a large hydrostatic stress within stressed volume, which enables a densifying plastic flow via enhanced structural relaxation and leads to the work hardening behavior, as evidenced by an obvious decrease in friction force signals within scratched regions. Further examination on the atomic structure beneath the scratched surface using high resolution transmission electron microscopy reveals a relaxed structural configuration, which is indicated by disperse clusters of medium-range order scale in the case of line scratching and nucleated nanocrystals in the case of cyclic scratching. This study provides a compelling evidence for stress-driven structural relaxation, greatly deepening the understanding of work hardening mechanism in metallic glasses.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"55 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143640349","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

Surface modification of steel runner with improved hydrophobicity for reducing the coefficient of friction for ice

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-14 DOI: 10.26599/frict.2025.9441021

Yujin Jeon, Sumit Barthwal, Jae-Kang Kim, Si-Hyung Lim

引用次数: 0