Friction最新文献_第6页

Mixed and thermal elastohydrodynamic simulation of a low-loss gear considering the gear system 考虑齿轮系统的低损耗齿轮混合热弹流仿真

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

Recent development in understanding the role of lipids in cartilage lubrication 脂质在软骨润滑中的作用的最新研究进展

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

Hydrophobic soft cone-assisted rolling robot inspired by sea urchin for gastrointestinal tract delivery 受海胆启发的用于胃肠道输送的疏水软锥辅助滚动机器人

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 考虑硬度梯度特性的重载齿轮接触疲劳极限预测方法

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 基于应力驱动结构排序的原子平面大块金属玻璃的划痕诱导加工硬化

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 改善疏水性的钢转轮表面改性，以降低冰的摩擦系数

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

Active control of friction in electrified ball bearing prototypes using electro-sensitive clay mineral-based lubricating fluids 基于电敏粘土矿物的润滑液的电动球轴承原型摩擦主动控制

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-14 DOI: 10.26599/frict.2025.9441023

Samuel David Fernández-Silva, Miguel Ángel Delgado, Claudia Roman, Tobias Amann, Felix Gatti, Andreas Kailer, Moisés García-Morales

{"title":"Active control of friction in electrified ball bearing prototypes using electro-sensitive clay mineral-based lubricating fluids","authors":"Samuel David Fernández-Silva, Miguel Ángel Delgado, Claudia Roman, Tobias Amann, Felix Gatti, Andreas Kailer, Moisés García-Morales","doi":"10.26599/frict.2025.9441023","DOIUrl":"https://doi.org/10.26599/frict.2025.9441023","url":null,"abstract":"The aim of this research is to present the use and advantages of electro-active eco-fluids as smart biolubricants. Polarizable clay mineral nanoparticles, such as the layered nanosilicate montmorillonite Cloisite 15A and the fiber-like sepiolite Pangel B20, were dispersed in a sustainable fluid, castor oil, at concentrations of 0.5, 2, and 4 wt%. These dispersions exhibit electro-viscous behavior, which was characterized by higher yield stress values with increasing electric field strength. Based on this, the influence of electric potentials was investigated in an electrified axial ball bearing device. The coefficient of friction (COF) was changed as needed and reversibly when different electric fields of 100 and 200 V/mm were applied. A 10.7% increase in the coefficient of friction was observed with a 4 wt% Cloisite 15A in castor oil at 200 V/mm. In the case of Pangel B20, the application of an electric field of 200 V/mm successfully prevented the lubricant from being displaced from the contact zone at 500 r/min. In addition, the dielectric breakdown resistance of these clays was analyzed. Cloisite 15A yielded better results than Pangel B20, probably due to its greater electro-responsive and thus film-forming potential. Finally, the load-carrying capacity was also evaluated. Under the action of an electric field, an opposite vertical force was observed when a ball was pressed onto a plate with a lubricating film in between. Consequently, the study allows conclusions to be drawn about a new lubrication concept based on electro-active control of friction in electrified tribological contacts by fully sustainable electro-rheological (ER) lubricating fluids.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"56 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619044","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

Superlubricating electrical contact between graphite layers 石墨层之间的超润滑电接触

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-14 DOI: 10.26599/frict.2025.9440989

Yanmin Liu, Dong Wang, Ke Zhang, Haijun Wu, Guoqing Yu, Qiang Zhang, Yuanzi Zhou, Tianbao Ma, Aisheng Song

{"title":"Superlubricating electrical contact between graphite layers","authors":"Yanmin Liu, Dong Wang, Ke Zhang, Haijun Wu, Guoqing Yu, Qiang Zhang, Yuanzi Zhou, Tianbao Ma, Aisheng Song","doi":"10.26599/frict.2025.9440989","DOIUrl":"https://doi.org/10.26599/frict.2025.9440989","url":null,"abstract":"High-conductivity sliding electrical contact with low friction plays a significant role in the long life and high reliability of electromechanical systems. Reducing friction needs weak interfacial electronic coupling; in contrast, enhancing conductivity requires strong coupling; thus it is a serious challenge to achieve high conductivity with low friction. Here, using our self-developed thermally assisted mechanical exfoliation and transfer (TAMET) method, we experimentally achieved superlubricating electrical contact by establishing a sliding electrical system between graphite layers (Gr); the friction coefficient was as low as 0.0004, and the electric current density was as high as 510 A/cm2. Compared with the commercial Ir atomic force microscopy (AFM) tip–Gr contact, the friction force of incommensurate graphene layer friction is an order of magnitude lower, yet it has a similar high electrical conductivity. On the basis of the electronic property fluctuation (EPF) model and first principles calculations, we revealed that the sliding energy barrier remains almost unchanged under an applied current because of the negligible electron transfer variation during the sliding process. We offer a method for achieving superlubricating electrical contact with high conductivity and low friction, shedding light on improving the service life and reliability of sliding electrical contacts in a wide range of electromechanical systems.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"6 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143618915","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

Cross-scale prediction for thermochemical–mechanical damage of barrel weapons under high-temperature and supersonic environments 高温超声速环境下管状武器热化学-机械损伤跨尺度预测

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-12 DOI: 10.26599/frict.2025.9440975

Shuli Li, Guolai Yang, Liqun Wang

{"title":"Cross-scale prediction for thermochemical–mechanical damage of barrel weapons under high-temperature and supersonic environments","authors":"Shuli Li, Guolai Yang, Liqun Wang","doi":"10.26599/frict.2025.9440975","DOIUrl":"https://doi.org/10.26599/frict.2025.9440975","url":null,"abstract":"Thermochemical–mechanical damage prediction suitable for high-temperature and supersonic conditions is essential for evaluating the life span of barrel weapons. This paper proposes a thermochemical–mechanical damage prediction method in extreme environments by combining the cross-scale damage framework and scale expansion strategy. For the cross-scale damage framework, macroscale surface damage is converted into mesoscale particulate impacts via two-phase flow interior ballistics. The particulate impact is transformed into microscale crystal impacts via velocity decomposition and synthesis. For the scale expansion strategy, the dislocation features of discretized crystals are obtained via the momentum mirror. The first proposed boundary dislocation can solve the boundary coupling of discretized crystals and modify the hardening criterion. A damage agent model is constructed on the basis of sufficient samples to generalize mesoscale crystal damage to macroscale surface damage. A simulation experiment is executed to verify the accuracy of the calculation method for determining crystal impact damage under high-temperature supersonic environments. A launching experiment with 100 projectiles is executed to prove the accuracy of the thermochemical–mechanical damage prediction method.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"21 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143599169","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

Effects of graphite-based material size on mechanical and tribological performance of polyimides under drying sliding condition 石墨基材料尺寸对干燥滑动条件下聚酰亚胺力学和摩擦学性能的影响

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-12 DOI: 10.26599/frict.2025.9441093

Changxin Wan, Dan Jia, Shengpeng Zhan, Wulin Zhang, Tian Yang, Yinhua Li, Jian Li, Haitao Duan

{"title":"Effects of graphite-based material size on mechanical and tribological performance of polyimides under drying sliding condition","authors":"Changxin Wan, Dan Jia, Shengpeng Zhan, Wulin Zhang, Tian Yang, Yinhua Li, Jian Li, Haitao Duan","doi":"10.26599/frict.2025.9441093","DOIUrl":"https://doi.org/10.26599/frict.2025.9441093","url":null,"abstract":" The present investigation evaluates the effect of graphite-based filler (GBF) size on the mechanical and tribological performance of polyimide (PI) solid lubricant composites. During dry sliding tribological experiments, micron-, nano-graphite (MG, NG), and ultrathin graphene (GN) additives were considered. The results revealed that atomic-thickness GN outperformed micron- and nano-sized GBF filler in terms of mechanical and tribological performance when added into PI matrix. It was inferred that the GN was able to generate sufficient lubricating phases at the frictional interface due to their small size and ultrathin morphology, which provided them with enhanced tribological properties in comparison with the micro and nano-sized GBF fillers. GN oxidized by reciprocating shear force and friction heat at friction interface and subsequently formed lubricating layer consisting of graphene oxide (GO), as characterized by FTIR and Raman, spectroscopy. Atomistic modeling techniques was also used to elucidate the surface/interface lubrication mechanism, where GO was tightly adsorbed at frictional interfaces by van der Waals. The results facilitate better understanding of size effect on wear mechanism for solid lubricants.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"31 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143599168","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