Tribology Letters最新文献

A JKR/Griffith Model for the Inception of Slip in the Contact Between Nominally Flat Rough Surfaces 名义平坦粗糙表面接触滑移起始的JKR/Griffith模型

IF 3.3 3区工程技术

Tribology Letters Pub Date : 2025-10-18 DOI: 10.1007/s11249-025-02075-z

X. M. Liang, M. Ciavarella

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Characterization of Branched-Chain Fatty Acids as Organic Friction-Modifier Additives for Boundary Lubrication 支链脂肪酸作为边界润滑有机摩擦改性添加剂的表征

IF 3.3 3区工程技术

Tribology Letters Pub Date : 2025-10-18 DOI: 10.1007/s11249-025-02067-z

Masanori Iizuka, Masashi Mizukami, Kazue Kurihara

{"title":"Characterization of Branched-Chain Fatty Acids as Organic Friction-Modifier Additives for Boundary Lubrication","authors":"Masanori Iizuka, Masashi Mizukami, Kazue Kurihara","doi":"10.1007/s11249-025-02067-z","DOIUrl":"10.1007/s11249-025-02067-z","url":null,"abstract":"<div><p>Organic friction modifier additives, such as fatty acids, are widely used in the boundary lubrication regime to reduce friction. In this study, we employed resonance shear measurements to study 0.1 wt% solutions of branched-chain fatty acids in a linear model base oil/hexadecane and branched base oil/poly(α-olefin) (PAO) confined between mica surfaces under various applied loads (<i>L</i>). At <i>L</i> = 3.3 mN, the viscosity parameter (<i>b</i><sub>s</sub>) values of isostearic acid and isostearic acid T in hexadecane were one-seventh and one-thirtieth of the value of pure hexadecane, respectively. Especially, isostearic acid T in hexadecane had a lower viscosity parameter <i>b</i><sub>s</sub> value, one-eighth that of pure hexadecane even at <i>L</i> = 22.7 mN. On the other hand, the <i>b</i><sub>s</sub> value at <i>L</i> = 3.3 mN of isostearic acid in PAO was half the value of pure PAO and this effect disappeared at <i>L</i> = 11.6 mN; isostearic acid T in PAO resulted in a behavior similar to that of pure PAO. The densely packed structure of linear lubricants as hexadecane confined between the surfaces is known to cause a high <i>b</i><sub>s</sub> value and such a structure could be disturbed in the presence of branched-chain fatty acid additives. In case of the branched base oil, such as PAO, the densely packed state was not formed under confinement, thus the effect of the branched-chain fatty acid additive was not significant. This study demonstrated that a relatively small difference in molecular structure of an additive is important for efficiently reducing friction, especially in the boundary lubrication regime of linear base oils.</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 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-025-02067-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145316356","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}

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Subset Analysis and Contact-Mechanics Analysis for Samples Included in the “Surface-Topography Challenge” “表面形貌挑战”中样品的子集分析和接触力学分析

IF 3.3 3区工程技术

Tribology Letters Pub Date : 2025-10-18 DOI: 10.1007/s11249-025-02079-9

P. Sainsot, A. A. Lubrecht

引用次数: 0

A Note on Transients in Rate-dependent Adhesion of Gelatin 关于明胶速率依赖性粘附瞬态的注解

IF 3.3 3区工程技术

Tribology Letters Pub Date : 2025-10-14 DOI: 10.1007/s11249-025-02076-y

Wonhyeok Lee, Melih Eriten

{"title":"A Note on Transients in Rate-dependent Adhesion of Gelatin","authors":"Wonhyeok Lee, Melih Eriten","doi":"10.1007/s11249-025-02076-y","DOIUrl":"10.1007/s11249-025-02076-y","url":null,"abstract":"<div><p>The transient behavior of rate-dependent adhesion in poro-viscoelastic contact is more complex than crack propagation in Mode I opening due to time-dependent material behavior, crack acceleration from nonlinear kinematics, and variation in contact radius. This study revisits our previous experiment, where a spherical glass probe is unloaded on flat gelatin, and investigates crack velocity (<span>(V_text {c})</span>) and energy release rate (ERR). For a given unloading rate, <span>(V_text {c})</span> increases monotonically by one order of magnitude, and the wide range of unloading rates ensures that <span>(V_text {c})</span> spans 3–4 orders of magnitude. ERR remains almost unchanged at 2–3 times the thermodynamic work of adhesion at slow rates. At fast rates, ERR initially increases to 4–8, then decreases until full separation. We hypothesize that the decreasing ERR trend is due to finite-size effects: the hysteretic energy dissipation zone grows with crack acceleration, while the material volume decreases during peeling. To explain these trends and the finite-size effect, we adapt de Gennes’ viscoelastic crack propagation model, modifying it to account for crack acceleration and the reduction in contact radius. Under the given time scales (peeling time and viscoelastic relaxation time) and length scales (crack tip radius and initial contact radius), we simulate the evolution of ERR as peeling proceeds and compare the results with experimental data. The model’s results show good qualitative agreement with the experiments. Finally, we discuss the model’s limitations, assumptions, and directions for future research.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-025-02076-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145316000","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}

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Resonance Enhancement of Atomic-Scale Friction: Nontrivial Role of Damping 原子尺度摩擦的共振增强：阻尼的重要作用

IF 3.3 3区工程技术

Tribology Letters Pub Date : 2025-10-14 DOI: 10.1007/s11249-025-02078-w

S. Yu. Krylov

{"title":"Resonance Enhancement of Atomic-Scale Friction: Nontrivial Role of Damping","authors":"S. Yu. Krylov","doi":"10.1007/s11249-025-02078-w","DOIUrl":"10.1007/s11249-025-02078-w","url":null,"abstract":"<div><p>Autoparametric resonance in a combined contact (tip apex)–driving-spring (cantilever) system, that is responsible for the appearance of multiple peaks in friction as a function of scanning velocity, is investigated in a wide range of the possible system damping. The role of cantilever damping, being practically inessential in conventional stick–slip regime at lower velocities, is shown to be crucial for the appearance of friction force peaks at the resonant and quasi-resonant velocities. With changing damping, the evolution of different peaks turns out to be nontrivial, that is related with an unusual manifestation of double slips of the tip and memory effects. Relative value of the main force peaks as functions of damping factor are non-monotonous with maximum, which can reach several tens percent, depending on the system parameters and temperature. Such a strong resonance enhancement of energy dissipation is likely to occur in practical systems, where damping of driving spring can be significant, in contrast to nearly ideal cantilevers used in AFM experiments.</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 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145315659","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}

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Analyzing and Predicting Interfacial Frictional States in Soft–Hard Contact via Tangential Displacement–Friction Force Relationships 基于切向位移-摩擦力关系的软硬接触界面摩擦态分析与预测

IF 3.3 3区工程技术

Tribology Letters Pub Date : 2025-10-03 DOI: 10.1007/s11249-025-02074-0

Jianhua Tang, Zhenglun Wang, Wei Li

{"title":"Analyzing and Predicting Interfacial Frictional States in Soft–Hard Contact via Tangential Displacement–Friction Force Relationships","authors":"Jianhua Tang, Zhenglun Wang, Wei Li","doi":"10.1007/s11249-025-02074-0","DOIUrl":"10.1007/s11249-025-02074-0","url":null,"abstract":"<div><p>The friction behavior between soft and hard materials has long been a crucial research subject in diverse fields, such as artificial joints, human skin contact, and robotic grasping. This study combines theoretical analysis with experimental exploration. By analyzing the variation in friction force and the characteristics of the sliding traces of silicone rubber materials during the entire friction process, it aims to delve into the frictional characteristics of soft–hard material interfaces. The results show that the sliding behavior at the soft–hard interface occurs before the peak of static friction. Through the approximation of a frictional theoretical model, the relationship between the friction force and the relative sliding distance at the interface is verified. Moreover, a method for predicting the interface frictional contact state and the relative sliding distance at the interface based on the friction force–tangential displacement curve is proposed. This research enhances our understanding of the friction mechanism at soft–hard interfaces and offers both theoretical support and practical guidance for the development of fine tactile feedback and dexterous manipulation systems in robotic grasping.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145210364","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}

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Effect of Surface Oxidation on Adsorption and Frictional Properties of Oiliness Additives Evaluated by Atomic Force Microscopy 原子力显微镜研究表面氧化对油性添加剂吸附和摩擦性能的影响

IF 3.3 3区工程技术

Tribology Letters Pub Date : 2025-09-30 DOI: 10.1007/s11249-025-02069-x

Lin Sun, Naoki Yamashita, Tomoko Hirayama, Kento Mimura, Yoshihiro Ito, Hironobu Nakanishi

{"title":"Effect of Surface Oxidation on Adsorption and Frictional Properties of Oiliness Additives Evaluated by Atomic Force Microscopy","authors":"Lin Sun, Naoki Yamashita, Tomoko Hirayama, Kento Mimura, Yoshihiro Ito, Hironobu Nakanishi","doi":"10.1007/s11249-025-02069-x","DOIUrl":"10.1007/s11249-025-02069-x","url":null,"abstract":"<div><p>A novel methodology using atomic force microscopy (AFM) has been developed for assessing the effect of surface oxidation on the adsorption and frictional properties of oiliness additives. This study focused on comparing the tribological behaviors of ester-based oiliness additives on oxidized versus pure Ti surfaces. The substrates were patterned to facilitate precise AFM-based friction testing. The oxide layer thickness was characterized by X-ray photoelectron spectroscopy and subsequently abraded using a diamond-coated AFM probe to expose the pure Ti surface. Tribological performance under atmospheric conditions was evaluated by comparing frictional properties using ester-based additives of varying ester functionalities, ranging from monoester to tetraester. Adsorption properties were characterized through neutron reflectometry and contact angle measurements. The results demonstrated a clear correlation between adsorption density and friction reduction, with tetraester showing superior performance, especially on pure Ti surfaces. These findings highlight the critical effect of oxidation states and additive molecular structures on frictional properties and adsorption behaviors at nanoscale resolution, providing valuable insights into boundary lubrication mechanisms and lubricant optimization.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145210927","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

In Situ and Ex Situ Analysis of the Reciprocating Sliding Wear Behavior of Cold Sprayed CrMnCoFeNi Cantor HEA Coatings in Dry Air and Ambient Air Conditions 冷喷涂CrMnCoFeNi Cantor HEA涂层在干燥空气和环境空气条件下往复滑动磨损行为的原位和非原位分析

IF 3.3 3区工程技术

Tribology Letters Pub Date : 2025-09-30 DOI: 10.1007/s11249-025-02072-2

Maya M. Harfouche, Sima A. Alidokht, Richard R. Chromik

{"title":"In Situ and Ex Situ Analysis of the Reciprocating Sliding Wear Behavior of Cold Sprayed CrMnCoFeNi Cantor HEA Coatings in Dry Air and Ambient Air Conditions","authors":"Maya M. Harfouche, Sima A. Alidokht, Richard R. Chromik","doi":"10.1007/s11249-025-02072-2","DOIUrl":"10.1007/s11249-025-02072-2","url":null,"abstract":"<div><p>This study examined and compared the tribological properties of a cold-sprayed CrMnCoFeNi high entropy alloy (Cantor alloy) coating under ambient and dry air conditions. Tribological testing was conducted using an in situ tribometer equipped with video microscopy, allowing real-time monitoring of the evolution of the sliding interfaces through a transparent sapphire counterface. This experimental setup provided the opportunity to observe phenomena that would otherwise remain concealed between the contacting bodies. The wear rate was 1.8 ± 0.5 × 10⁻<sup>4</sup> mm<sup>3</sup>/Nm in ambient air and 7.5 ± 0.7 × 10⁻<sup>4</sup> mm<sup>3</sup>/Nm in dry air. In dry air, the velocity accommodation mode was characterized by interfacial sliding of a static transfer film against the wear track, resulting in a stable steady-state coefficient of friction (CoF) of 0.5. In contrast, ambient air conditions led to an average CoF of 0.8, with fluctuations attributed to plastic shearing of the transfer film observed in situ. The higher humidity in ambient air inhibited cold welding of wear particles, resulting in a less stable transfer film that underwent removal or extrusion events, which were associated with sudden drops in CoF. Additionally, a “metal debris” oxide formation mechanism was observed in ambient air, contributing to the formation of a protective tribofilm and a reduction in the wear rate. In dry air, the “oxidation-scrape-reoxidation” mechanism dominated, facilitated by the absence of adsorbed water droplets. This resulted in an increased wear rate under dry conditions.</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 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145211042","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

Defining Scuffing Phases via Friction Evolution and Surface Analysis Through Experiments Using Castor Oil Biolubricant 用蓖麻油生物润滑剂通过摩擦演化和表面分析来确定磨损阶段

IF 3.3 3区工程技术

Tribology Letters Pub Date : 2025-09-26 DOI: 10.1007/s11249-025-02073-1

R. H. S. Souza, G. Lasch, A. A. Rodrigues, G. S. Gehlen, L. Y. Barros, J. C. Poletto, P. Stradolini, C. L. Petzhold, N. F. Ferreira, P. D. Neis

{"title":"Defining Scuffing Phases via Friction Evolution and Surface Analysis Through Experiments Using Castor Oil Biolubricant","authors":"R. H. S. Souza, G. Lasch, A. A. Rodrigues, G. S. Gehlen, L. Y. Barros, J. C. Poletto, P. Stradolini, C. L. Petzhold, N. F. Ferreira, P. D. Neis","doi":"10.1007/s11249-025-02073-1","DOIUrl":"10.1007/s11249-025-02073-1","url":null,"abstract":"<div><p>Scuffing is a severe wear mode that occurs under boundary lubrication. This wear mode remains challenging to predict, and no objective criteria have been established in the literature to characterize the evolution of the phenomenon across the distinct phases of frictional behavior. This study proposes a quantitative method to characterize the three typical scuffing phases (stable, incipient, and severe) based on friction force evolution. Block-on-ring tests were conducted using SAE 52100 steel and two biolubricants: pure castor oil (CO) and aminolyzed castor oil (ACO). A mathematical approach was developed by analyzing the variation of friction force (delta friction) across discretized time intervals. Real-time imaging enabled direct correlation between friction behavior and surface damage. SEM/EDS analyses revealed that the material accumulated during severe scuffing consisted of oxidized oil and steel particles. The dynamic of formation and destruction of these accumulated material explains the observed friction instabilities. The proposed method successfully identified all scuffing phases across tests and was validated by consistent morphological and chemical evidence. ACO significantly increased the time to reach severe scuffing compared to CO, with results confirmed by Weibull statistical analysis. The approach presented herein provides a robust and replicable framework for scuffing characterization and supports the application of chemically modified biolubricants as sustainable alternatives with enhanced tribological performance.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145170267","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

Research on Fractal Modeling of Hard-Coated Rough Surface Contact Considering the Mechanism of Elastic–Plastic Deformation 考虑弹塑性变形机理的硬质涂层粗糙表面接触分形建模研究

IF 3.3 3区工程技术

Tribology Letters Pub Date : 2025-09-25 DOI: 10.1007/s11249-025-02071-3

Yizhang Lian, Xueliang Zhang, Nanshan Wang, Yonghui Chen, Shanjun Liao

{"title":"Research on Fractal Modeling of Hard-Coated Rough Surface Contact Considering the Mechanism of Elastic–Plastic Deformation","authors":"Yizhang Lian, Xueliang Zhang, Nanshan Wang, Yonghui Chen, Shanjun Liao","doi":"10.1007/s11249-025-02071-3","DOIUrl":"10.1007/s11249-025-02071-3","url":null,"abstract":"<div><p>This study develops an elastoplastic fractal contact model for rough hard-coated surfaces along, with a corresponding contact stiffness model based, on a coated asperity contact model and a statistical rough surface contact model. To establish the contact stiffness model for the coated surface asperities, seven fundamental postulates were developed. Numerical simulations were conducted to systematically analyze the influence of the ratio between the coating thickness and the asperity radius, the material properties of the coating and the substrate, and the substrate surface roughness on the contact behavior and stiffness of the coated surfaces. The results demonstrate that under a given load, hard-coated rough surfaces exhibit a smaller real contact area but higher stiffness compared to uncoated surfaces. Thicker and stiffer coatings further reduce the contact area while increasing stiffness. Smoother substrate surfaces lead to a larger contact area and higher stiffness in the coated systems. These findings align with the existing statistical contact models for hard-coated rough surfaces, and the predicted contact area closely matches the prior simulation results. To validate the model, experimental tests were conducted on the TiN-coated specimens. The theoretically predicted contact stiffness showed strong agreement with the experimental measurements, confirming the accuracy and applicability of the proposed fractal-based stiffness model.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":"73 4","pages":""},"PeriodicalIF":3.3,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169716","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