Friction最新文献_第4页

Active control of friction in electrified ball bearing prototypes using electro-sensitive clay mineral-based lubricating fluids

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

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

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

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

Gecko-inspired contact-sensible and self-adaptive soft gripping of curved flexible surfaces

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-12 DOI: 10.26599/frict.2025.9441027

Wenhui Cui, Yuanzhe Li, Tianhui Sun, Tong Ling, Shiyang Guo, Wenling Zhang, Yu Tian

{"title":"Gecko-inspired contact-sensible and self-adaptive soft gripping of curved flexible surfaces","authors":"Wenhui Cui, Yuanzhe Li, Tianhui Sun, Tong Ling, Shiyang Guo, Wenling Zhang, Yu Tian","doi":"10.26599/frict.2025.9441027","DOIUrl":"https://doi.org/10.26599/frict.2025.9441027","url":null,"abstract":"Soft grippers are key manipulation tools for robotics and end effectors for securely grasping objects of various shapes and sizes on demand. However, critical challenges, including self-adaptive grasping to curved surfaces and monitoring the contact state, remain. Here, a gecko-inspired curved flexible surface adaptive gripper (CSAG), which consists of a variable-bending pneumatic actuator, a triboelectric sensor (T-sensor), and a gecko-inspired microwedge adhesive, is proposed. The contact-sensitive triboelectric sensor can sense the critical contact state of objects to trigger a variable-bending pneumatic actuator with sufficient shear loading for the geckoinspired microwedge adhesive. A set of experiments are implemented to verify that the proposed soft gripper can adaptively grasp diverse curved objects, including quail eggs, cans, shuttlecocks, expanding objects with varying volumes (such as balloons, the range of diameter variation is 20–115 mm), and spherical acrylic cylinders (20–40 mm) at low pressures (20–25 kPa) with a maximum weight of 37 g. Additionally, the tracking and grasping of a moving ball is demonstrated via a mean-shift algorithm based on image recognition coupled with coordination tracking of a robotic arm. The soft gripper provides a new paradigm to achieve switchable grasping of curved flexible surfaces, which broadens future applications for versatile unstructured human‒robot‒environment interactions, such as adaptive robots and medical devices.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"16 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143599172","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

Fretting wear behavior of silicone rubber with biomimetic surface texture

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-12 DOI: 10.26599/frict.2025.9441000

Tengfei Zhang, Jie Su, Liaoliang Ke

引用次数: 0

Non-trivial role of surrounding gases in triboluminescence: A comprehensive review

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-06 DOI: 10.26599/frict.2025.9440998

Adis A. Tukhbatullin, Glyus L. Sharipov, Roman A. Nevshupa

{"title":"Non-trivial role of surrounding gases in triboluminescence: A comprehensive review","authors":"Adis A. Tukhbatullin, Glyus L. Sharipov, Roman A. Nevshupa","doi":"10.26599/frict.2025.9440998","DOIUrl":"https://doi.org/10.26599/frict.2025.9440998","url":null,"abstract":"Research on triboluminescence phenomena has been comprehensively reviewed, with a focus on the activation mechanisms resulting from the dissipation of mechanical energy at interfaces. The complexity and interdisciplinary nature of this phenomenon, along with its dependence on gas composition and pressure, have been analyzed. Special attention was given to air, inert gases, polyatomic gases, and hydrocarbon gases. The influence of gas composition on triboluminescence is not straightforward. This is because at least three components are associated with different physical and chemical processes and activation mechanisms. These components include TL1: gas discharge luminescence. This occurs because of the generation of an electric field and dielectric breakdown of gases surrounding the mechanically activated zone of the material; TL2: photoluminescence of mechanically activated material. This results from the excitation of luminescent centers by the absorption of ultraviolet radiation from the gas discharge; TL3: material luminescence not related to photoluminescence. This is the least studied and most complex component. This can be related to the direct coupling of the mechanical force with the energy landscape of defects, impurities, and other centers. These centers can be excited and emit light during deexcitation. Other possibilities include luminescence excited by electric fields, exoelectron emission, etc. Therefore, the gas environment is crucial not only for gas discharge (as various gases can promote or quench it) but also for controlling other excitation and deexcitation processes. These processes occur through interactions of adsorbed films with stressed materials, tribochemical reactions, photochemical reactions, and so on. Furthermore, the potential application of triboluminescence for sensing gas composition is highlighted.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"2 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560820","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

Graphene oxide gluing layer enabling macroscale tribology applications of pristine graphene

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-04 DOI: 10.26599/frict.2025.9441092

Mingi Choi, Ivan V Vlassiouk, Won-Seok Kim, Jeong Han Kim, Anirudha V Sumant, Ji-Woong Jang, Junho Suh, Young-Jun Jang, Songkil Kim

{"title":"Graphene oxide gluing layer enabling macroscale tribology applications of pristine graphene","authors":"Mingi Choi, Ivan V Vlassiouk, Won-Seok Kim, Jeong Han Kim, Anirudha V Sumant, Ji-Woong Jang, Junho Suh, Young-Jun Jang, Songkil Kim","doi":"10.26599/frict.2025.9441092","DOIUrl":"https://doi.org/10.26599/frict.2025.9441092","url":null,"abstract":"In recent studies of two-dimensional nanomaterials-based solid lubricants, the importance of durability has been emerging for real engineering-scale applications. To achieve this, a transfer layer formation is essential to prevent the wear of the mechanical systems. However, it has been challenging for pristine graphene (PG) to induce a material transfer due to chemical inertness. In this study, we suggest an easy-to-process strategy to promote the huge material transfer of the PG onto the counterpart contacting material. We utilized graphene oxide (GO) as a gluing layer between the PG film and the counterpart contact surface for realizing the superior tribological performance. The high interaction energy of the GO from its functional groups makes a contribution to the material transfer of PG, which is unveiled by systematic analysis of the counterpart contact surface and the wear track. The huge solid transfer layer not only makes a wear-resistant contact interface between the transfer layer and the underlying film by densification and oxidation, but also reduces surface interaction energies, finally resulting in the significant improvement in the durability.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"41 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538768","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

Design and tribological study of cartilage-inspired biphasic hydrogel-containing composites

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-04 DOI: 10.26599/frict.2025.9441090

Xuefei Li, Zhiwei Guo, Zhanmo Zheng, Zumin Wu, Ying Yang, Chengqing Yuan

{"title":"Design and tribological study of cartilage-inspired biphasic hydrogel-containing composites","authors":"Xuefei Li, Zhiwei Guo, Zhanmo Zheng, Zumin Wu, Ying Yang, Chengqing Yuan","doi":"10.26599/frict.2025.9441090","DOIUrl":"https://doi.org/10.26599/frict.2025.9441090","url":null,"abstract":"Boundary lubrication under harsh working conditions results in severe wear of water-lubricated bearing materials, e.g., the tail bearing in a ship. Inspired by cartilage lubrication, we prepare a smart hydrogel with balanced hydration and load-bearing properties through the construction of PVA-chitosan/sodium alginate double networks and the introduction of aramid nanofiber. The hydrogels are blended with UHMWPE into new bionic biphasic hydrogel-containing composites. The thorough assessments (chemical, thermal, surface, and bulk mechanical properties) of the hydrogels and the composites reveal that the high hydrophilicity of the hydrogel particles encapsulated in bulk UHMWPE facilitates water absorption leading to improved friction performance under boundary lubrication mode, e.g. at the startup. while the stripped hydrogel pits and induced micro-texture between friction interfaces as hydration layer play the role of separating the friction interface, effectively reducing the friction contact. Under 40 N load, the friction coefficient and wear rate of one composite are 28.7% and 14% lower than those of the plain UHMWPE, respectively. After soaking in seawater for 28 days and holding at 50℃ for 1 hour, the mechanical properties of the composite material are still better than plain UHMWPE. Altogether, the smart biphasic hydrogel-containing composites the intelligent biphasic hydrogel composites were able to improve the lubrication state according to operation conditions.","PeriodicalId":12442,"journal":{"name":"Friction","volume":"9 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538767","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

Experimental investigation of the influence of surface structures on hydrodynamic fluid film thickness and contact temperatures in sliding contacts

IF 6.8 1区工程技术

Friction Pub Date : 2025-03-04 DOI: 10.26599/frict.2025.9441089

D. Bulut, N. Bader

引用次数: 0