Tribology Letters最新文献

Time and Spatially Resolved Raman Spectroscopic Observation for Superlubricious Frictional Interfaces of Concentrated Polymer Brushes 高分子刷体超润滑摩擦界面的时空分辨拉曼光谱观察

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2025-05-24 DOI: 10.1007/s11249-025-02011-1

Hikaru Okubo, Daiki Kagiwata, Ryusei Nakamura, Toru Takeuchi, Ken Nakano, Yoshinobu Tsujii

{"title":"Time and Spatially Resolved Raman Spectroscopic Observation for Superlubricious Frictional Interfaces of Concentrated Polymer Brushes","authors":"Hikaru Okubo, Daiki Kagiwata, Ryusei Nakamura, Toru Takeuchi, Ken Nakano, Yoshinobu Tsujii","doi":"10.1007/s11249-025-02011-1","DOIUrl":"10.1007/s11249-025-02011-1","url":null,"abstract":"<div><p>Pursuing durable superlow friction tribological systems is essential for addressing global energy challenges and achieving carbon neutrality by 2050. Inspired by the exceptional frictional performance of human knee joints, concentrated polymer brushes (CPBs) have emerged as a promising solution for artificial tribological applications. However, a major challenge remains in the reduced durability of CPBs compared to traditional hard materials, particularly in maintaining superlow friction over extended use. This study focuses on understanding the mechanisms behind the vanishing superlow friction and wear of CPBs lubricated with ionic liquids (ILs). To investigate these phenomena, we developed a real-time and spatially resolved “in-operando Raman tribometer” for real-time monitoring of molecular dynamics at friction interfaces. Time and spatially resolved Raman measurements revealed critical insights into the polymer chain behavior, IL film drainage, and internal stress changes that influence friction and wear mechanisms. Our results suggest that the “probe vertical lift” phenomenon and distribution of the solid–liquid interface structure play key roles in the transition from superlow to high friction and accelerated wear. These findings provide a foundation for developing durable, energy-efficient tribological systems in various industrial applications.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-025-02011-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Investigation of Dry Reciprocating Wear Behaviour Using an Annular Common Edge Contact Configuration 使用环形共缘接触结构干往复磨损行为的实验研究

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2025-05-23 DOI: 10.1007/s11249-025-02012-0

E. B. Ozen, J. E. Huber

{"title":"Experimental Investigation of Dry Reciprocating Wear Behaviour Using an Annular Common Edge Contact Configuration","authors":"E. B. Ozen, J. E. Huber","doi":"10.1007/s11249-025-02012-0","DOIUrl":"10.1007/s11249-025-02012-0","url":null,"abstract":"<div><p>Experimental studies on wear often employ incomplete contact configurations which cause variations in uncontrolled variables as wear progresses, ultimately leading to coupled results. This study observes fundamental wear mechanisms under dry gross sliding conditions. Reciprocating wear experiments are conducted at constant normal load using annular samples having flat-on-flat common edge contact configuration that are made of Al 6082 T6. This configuration ensures constant nominal contact area and pressure, nominally uniform contact pressure distribution, an edge-free contact region along the sliding direction and uniform air exposure of the contact area. A comprehensive investigation of fundamental wear behaviour is conducted through measurements of wear mass, tangential and vertical displacement, hysteresis loop area, coefficient of friction and tangential contact stiffness. In contrast to some previous studies on annular contacts, the results show increasing wear mass with normal load. The findings also indicate that a reliable displacement measurement technique, here digital image correlation, is essential for accurate tracking of relative surface displacements. This enables correction for machine compliance and hence accurate tangential contact stiffness measurements, and accurate observation of dilatant motion. In contrast, the test machine’s nominal measurements are shown to be sufficient for work input calculations. The evolution of both the vertical displacement and the hysteresis loop area implies the presence of two distinct processes during the initial transient stage: surface roughening and debris bed formation. Competition between these processes is shown to govern transient wear.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-025-02012-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144125856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of Graphene/Substrate-Interaction on Lubrication within Moiré Heterostructures 石墨烯/衬底相互作用对流体异质结构润滑的影响

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2025-05-22 DOI: 10.1007/s11249-025-02008-w

Zifu Shen, Yongchao Chen, Guangchao Han, Ruilin Yan, Hailong Wang

{"title":"Impact of Graphene/Substrate-Interaction on Lubrication within Moiré Heterostructures","authors":"Zifu Shen, Yongchao Chen, Guangchao Han, Ruilin Yan, Hailong Wang","doi":"10.1007/s11249-025-02008-w","DOIUrl":"10.1007/s11249-025-02008-w","url":null,"abstract":"<div><p>Understanding and controlling friction is crucial for advancements in nanoscale systems and microelectromechanical devices. Moiré superlattices formed on graphene-covered metallic substrates present a unique opportunity to modulate frictional behavior. However, the role of graphene/substrate interaction in lubrication within these heterostructures remains inadequately explored. In this study, molecular dynamics simulations combined with theoretical modeling are employed to investigate the impact of graphene-substrate interactions on friction in moiré heterostructures. The results reveal a nonmonotonic dependence of lateral forces on interaction strength, governed by the competition between graphene wrinkling and elastic energy dynamics. In the weak interaction regime, tip/graphene-adhesion-induced graphene wrinkling enhances friction by increasing pinning atoms. In contrast, strong interactions lead to elastic energy accumulation and relaxation, elevating friction during stick–slip motion. Additional factors, such as normal load, tip size, tip geometry, and tip/graphene interaction, significantly influence frictional behavior. An improved Prandtl-Tomlinson model is developed to validate the findings, demonstrating excellent agreement with simulation results. This work elucidates the mechanisms underlying graphene-substrate-interaction-dependent frictional behavior and offers a framework for tuning tribological properties in two-dimensional materials, enabling the design of advanced MEMS and NEMS with controllable lubrication.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144108661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Influence of Load and Position of Center of Mass on COF in Cross-Country Skiing 越野滑雪中载荷和质心位置对COF的影响

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2025-05-21 DOI: 10.1007/s11249-025-01999-w

Joakim Sandberg, Gustav Hindér, Hans-Christer Holmberg, Andreas Almqvist, Roland Larsson

{"title":"Influence of Load and Position of Center of Mass on COF in Cross-Country Skiing","authors":"Joakim Sandberg, Gustav Hindér, Hans-Christer Holmberg, Andreas Almqvist, Roland Larsson","doi":"10.1007/s11249-025-01999-w","DOIUrl":"10.1007/s11249-025-01999-w","url":null,"abstract":"<div><p>Cross-country skiers employ various techniques, where the ski is exposed to different forces during the motion. This study utilized a novel sled tribometer to investigate the combined effects of load and positioning of the skier on the coefficient of friction (COF) between the skis and snow. Three different loads (40 kg, 80 kg and 120 kg) were applied to the sled, and the center of mass was systematically varied between three positions behind the binding position: 70mm (leaning forward), 140mm (centered) and 210mm (backward). A variety of skis were used, including different models of skate skis and one classic-style ski with grip wax. The results consistently demonstrated that increasing the load on the sled reduced the COF by up to 15% (from the lowest to highest load), regardless of the position of the center of mass. The position of the center of mass had a minimal effect on COF in most tests. An exception was observed when using grip wax, where a forward-leaning position combined with a heavy load significantly increased the COF (~ 8%) compared to what is expected without grip wax. This load-dependent reduction in the COF was observed across different skis and test sessions. The ski camber profile was measured for all skis in all configurations. In general, increasing the load increases the glide zone length but at the same time increasing the average pressure. The position of the center of mass has little to no effect on the rear glide zone but slightly alters the length and position of the front glide zone. While the mechanisms of friction are discussed, a complete understanding of these mechanisms has not yet been reached.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-025-01999-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144108569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the Friction Properties of TZM Alloy Under Different Loads 不同载荷下TZM合金摩擦性能的研究

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2025-05-16 DOI: 10.1007/s11249-025-02007-x

Keji Yue, Lu Wang, Ziyuyang Zheng, Yuan Dong, Dongting Li, Renquan Wang, Chang Liu, Ying Liu

{"title":"Investigation of the Friction Properties of TZM Alloy Under Different Loads","authors":"Keji Yue, Lu Wang, Ziyuyang Zheng, Yuan Dong, Dongting Li, Renquan Wang, Chang Liu, Ying Liu","doi":"10.1007/s11249-025-02007-x","DOIUrl":"10.1007/s11249-025-02007-x","url":null,"abstract":"<div><p>Titanium-zirconium-molybdenum (TZM) alloy, one of the most widely utilized molybdenum alloys, usually experiences friction during service, which leads to tribological failure. However, its friction performances greatly vary under different loads, and the underlying mechanisms remain unclear. In this study, we developed reciprocating friction tests of TZM alloy in aerobic conditions, and evaluated its tribological properties and mechanism under the normal force ranging from 1 to 10 N. The wear process is primarily affected by oxidation, adhesion, and fatigue wear, and adhesive wear intensifies with increasing load, which mainly results in the gradual decline in coefficient of friction from 1.022 to 0.510, as well as variations of friction performances and wear track morphology, thereby elucidating the wear mechanism. There is a long running-in period at a low load of 1 N, with a significant accumulation of mixed oxides of MoO<sub>3</sub> and Mo<sub>4</sub>O<sub>11</sub> in the wear tracks, leading to a minimal wear rate of 1.68 × 10<sup>–5</sup> mm<sup>3</sup>·N<sup>−1</sup>·m<sup>−1</sup> after 9000 cycles. At 2 N and 4 N, these oxides undergo repeated spalling, crushing, and re-forming processes. As the load increases to 7 N and 10 N, the wear rate surges to above 1.31 × 10<sup>–4</sup> mm<sup>3</sup>·N<sup>−1</sup>·m<sup>−1</sup> due to intensified adhesion and debris discharge.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Layered Rare Earth Sulfates as Solid Lubricants for Enhancing Grease’s High Extreme-Pressure Performance 层状稀土硫酸盐作为固体润滑剂提高润滑脂的高压性能

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2025-05-13 DOI: 10.1007/s11249-025-02010-2

Xiaosheng Zhang, Xuexue He, Chong Ma, Xiaowei Kong, Gangsen Li, Li Qiao, Yanfei Zhang, Kangwei Li, Jingyi Ma, Yuewei Zheng, Lei Liu

{"title":"Layered Rare Earth Sulfates as Solid Lubricants for Enhancing Grease’s High Extreme-Pressure Performance","authors":"Xiaosheng Zhang, Xuexue He, Chong Ma, Xiaowei Kong, Gangsen Li, Li Qiao, Yanfei Zhang, Kangwei Li, Jingyi Ma, Yuewei Zheng, Lei Liu","doi":"10.1007/s11249-025-02010-2","DOIUrl":"10.1007/s11249-025-02010-2","url":null,"abstract":"<div><p>Developing and utilizing high-extreme pressure (EP) performance solid lubricants has become imperative to meet the lubrication requirements for harsh operating conditions. Based on the action mechanism of rare earth on alloys, the influence of material corrugated layered crystal structure, and sulfur content on lubrication properties at the atomic and molecular levels, layered rare earth sulfates have become a new type of high EP performance solid lubricants. Herein, we prepared layered rare earth sulfate materials (RE<sub>2</sub>(OH)<sub>4</sub>SO<sub>4</sub>·nH<sub>2</sub>O, RE = La/Sm/Ce, i.e., RES, LaS, SmS, CeS, respectively) using a mild hydrothermal method for controlled particle size and morphology. To evaluate its applicability, we tested the new solid lubricants against high load, high temperature, long-term, different friction pair materials, and fretting. Overall, the RES samples exhibited excellent lubricating behavior when added to polyurea grease, better than MoS<sub>2</sub>. By adding layered lanthanum sulfate, samarium sulfate, and cerium sulfate, the seizure loads can reach up to 1400, 1300, and 1300 N, respectively. Microscopic analysis of the friction pairs confirmed that the lubricating films formed on the worn surface during friction. Excitingly, the RES materials exhibited excellent synergistic effects on EP performance and corrosion resistance. Thus, these materials have broad application prospects as lubricants.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Lubricating Performance and Conductive Ability of Polyurea Grease by Metal Oxide Modified Tungsten Disulfide Composites 金属氧化物改性二硫化钨复合材料增强聚脲润滑脂的润滑性能和导电性能

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2025-05-13 DOI: 10.1007/s11249-025-02006-y

Wenhao Chen, Yanqiu Xia, Yi Zhang

引用次数: 0

Quantifying Hydrogen Concentrations and their Influence on Surface-Initiated Damage in Rolling/Sliding Contacts of 100 Cr6 Bearing Steel 氢浓度定量及其对100cr6轴承钢滚动/滑动接触表面损伤的影响

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2025-05-13 DOI: 10.1007/s11249-025-02004-0

Lisa-Marie Weniger, Kinza Jamil, Birhan Sefer, Leonardo Pelcastre, Pia Åkerfeldt, Claes-Olof A. Olsson, Jens Hardell

{"title":"Quantifying Hydrogen Concentrations and their Influence on Surface-Initiated Damage in Rolling/Sliding Contacts of 100 Cr6 Bearing Steel","authors":"Lisa-Marie Weniger, Kinza Jamil, Birhan Sefer, Leonardo Pelcastre, Pia Åkerfeldt, Claes-Olof A. Olsson, Jens Hardell","doi":"10.1007/s11249-025-02004-0","DOIUrl":"10.1007/s11249-025-02004-0","url":null,"abstract":"<div><p>This work investigates the quantitative effect of the hydrogen concentration of 100Cr6 bearing steel on the surface-initiated damage induced during lubricated rolling/sliding tribotesting. Hydrogen was introduced to the samples prior to tribotesting by electrochemical pre-charging, and hydrogen concentration was measured using thermal desorption analysis. The surface-initiated damage was quantified by optical profilometry and scanning electron microscopy. An upper limit for the critical hydrogen concentration was determined to be 1.4–2 wppm diffusible hydrogen. At this concentration, the area fraction covered by damage features was found to double compared to uncharged samples. As both charged and uncharged samples exhibited the same type of surface damage (early-stage micropitting), it was concluded that hydrogen did not change the wear mechanism but decreased the number of contact cycles necessary for the initiation of surface defects.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-025-02004-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Multi-Scale Contact Model for Rough Surfaces Under Loading and Unloading Conditions 加载和卸载条件下粗糙表面的多尺度接触模型

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2025-05-10 DOI: 10.1007/s11249-025-02005-z

Xuerui Zhang, Hongda Shen, Fuli Zhang, Guorui Zhang, Huanxiong Xia, Jianhua Liu, Xiaohui Ao, Juncheng Luo, Xuedong Zhu, Jian Zhang, Xiaohu Wu

引用次数: 0

On the Intricate Relation between Contact Aspect Ratio, High-Pressure Rheology, and Minimum Film Thickness in Elastohydrodynamic Conjunctions 弹流连接中接触宽高比、高压流变性和最小膜厚之间的复杂关系

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2025-05-10 DOI: 10.1007/s11249-025-02009-9

W. Habchi, P. Sperka, S. Bair

{"title":"On the Intricate Relation between Contact Aspect Ratio, High-Pressure Rheology, and Minimum Film Thickness in Elastohydrodynamic Conjunctions","authors":"W. Habchi, P. Sperka, S. Bair","doi":"10.1007/s11249-025-02009-9","DOIUrl":"10.1007/s11249-025-02009-9","url":null,"abstract":"<div><p>Until recently, it was believed that both central and minimum film thickness in elastohydrodynamic lubricated conjunctions are governed by the lubricant low-pressure rheology, in the contact inlet. A recent study by the authors has shown that minimum film thickness in circular contacts is also affected by the high-pressure rheology. It was shown that higher lubricant viscosity in the high-pressure central zone of the contact leads to lower minimum film thicknesses. This was linked to a reduction in lubricant outflow from the contact through the sides. That is why such effects would not be observed in infinitely long line contacts. It was then posited that minimum-film-thickness sensitivity to high-pressure rheology should be higher in circular contacts than wide elliptical ones and even higher in slender contacts. The current work aims to verify this assumption and elucidate the intricate relation between contact aspect ratio, high-pressure rheology, and minimum film thickness in elastohydrodynamic conjunctions. This is done through finite element simulations of elliptical contacts of variable ellipticity, lubricated with two hypothetical fluids having the exact same low-pressure viscosity response, but a different high-pressure one.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 2","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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