Tribology Letters最新文献_第5页

Assessing the Performance of TOR Lubricants in Humid Environments and Under Dew Conditions 评估 TOR 润滑油在潮湿环境和露水条件下的性能

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2024-07-16 DOI: 10.1007/s11249-024-01889-7

Simon Skurka, Radovan Galas, Milan Omasta, Haohao Ding, Wen-Jian Wang, Ivan Krupka, Martin Hartl

{"title":"Assessing the Performance of TOR Lubricants in Humid Environments and Under Dew Conditions","authors":"Simon Skurka, Radovan Galas, Milan Omasta, Haohao Ding, Wen-Jian Wang, Ivan Krupka, Martin Hartl","doi":"10.1007/s11249-024-01889-7","DOIUrl":"10.1007/s11249-024-01889-7","url":null,"abstract":"<div><p>Top-of-rail (TOR) lubricants are commonly used for friction control in railway operations. They aim to lower friction and reduce noise and wear while ensuring sufficient transmission of traction/braking forces. However, the wheel–rail interface is an open system, so the conditions may suddenly change due to the weather, and different contaminants may enter the contact and influence the performance of these lubricants. Thus, this study examined the effect of humidity and dew on two commercial products, as these conditions often occur on the track. A methodology based on a creep curves measurement approach was used to assess product performance under various scenarios. All measurements were conducted on a universal tribometer in the ball-on-disc configuration covered with a climate chamber. The results show a strong influence of dew on the tested products, as dew lowered their performance parameters and caused low adhesion problems. Possible mechanisms of water–oil interaction and formation of oxidic third body layers were discussed. The main findings indicate that TOR lubricants may cause traction/braking problems if used in dew conditions. The present study may be helpful in optimising friction management methods in the future.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-024-01889-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141640580","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 Molecular Dynamics Study on the Adhesive Contact with Effect of Tangential Forces 切向力影响下的粘合接触分子动力学研究

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2024-07-13 DOI: 10.1007/s11249-024-01891-z

Jin-Shan He, Gan-Yun Huang, Yue-Sheng Wang, Liao-Liang Ke

引用次数: 0

Correction to: Thickener Behaviour in Rolling Elastohydrodynamic Lubrication Contacts 更正：轧制流体动力润滑接触中的增稠剂行为

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2024-07-12 DOI: 10.1007/s11249-024-01887-9

Michal Okal, David Kostal, Kazumi Sakai, Ivan Krupka, Martin Hartl

引用次数: 0

Tribological Investigation on WC/C Coatings Applied on Bearings Subjected to Fretting Wear 受摩擦磨损轴承上使用的 WC/C 涂层的摩擦学研究

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2024-07-10 DOI: 10.1007/s11249-024-01892-y

B. Pinedo, G. Mendoza, A. López-Ortega, C. Zubizarreta, L. Mendizabal, S. Fraile, L. Ionescu

{"title":"Tribological Investigation on WC/C Coatings Applied on Bearings Subjected to Fretting Wear","authors":"B. Pinedo, G. Mendoza, A. López-Ortega, C. Zubizarreta, L. Mendizabal, S. Fraile, L. Ionescu","doi":"10.1007/s11249-024-01892-y","DOIUrl":"10.1007/s11249-024-01892-y","url":null,"abstract":"<div><p>This study investigates the capability of WC/C coatings to protect bearing bores against fretting wear when there is a lack of lubrication, a typical failure mechanism in bearings subjected to vibrations. Linear pin-on-disc and rotary oscillating block-on-ring tribological tests were carried out reproducing fretting conditions to evaluate the tribological performance and fretting resistance of the developed WC/C coating in comparison with those of the two common coatings currently employed to prevent this type of bearing failure, i.e. thin-dense chrome and fluoropolymer coatings. The friction forces generated under fretting conditions were evaluated, and a deep surface analysis of the tribosystems was carried out through different microscopic techniques in order to identify the wear mechanisms prevailing in each coating. Results suggested that WC/C coatings could be promising candidates to mitigate fretting damage, as they combine a low friction coefficient with good wear resistance. Furthermore, WC/C coatings constitute a more sustainable solution compared to the currently employed PTFE and chrome-based coatings, paving the way to a greener society.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141567475","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

Preparation and Tribological Behavior of N-doped Graphene Oxide Quantum Dots with MoS2 and Al2O3 Nanocomposites as Lubricant Additive in Aqueous Glycerol 掺杂 N 的氧化石墨烯量子点与 MoS2 和 Al2O3 纳米复合材料在甘油水溶液中作为润滑添加剂的制备与摩擦学行为

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2024-07-03 DOI: 10.1007/s11249-024-01885-x

Sang Xiong, Jiaqi He, Chenglong Wang

引用次数: 0

Effect of Humidity on the Tribological Properties of PA66 Gear Materials 湿度对 PA66 齿轮材料摩擦学特性的影响

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2024-07-02 DOI: 10.1007/s11249-024-01882-0

Yonglong Wu, Jing Tan, Xinmin Li, Wing San Tony Hung, Ulf Olofsson, Löwer Manuel

{"title":"Effect of Humidity on the Tribological Properties of PA66 Gear Materials","authors":"Yonglong Wu, Jing Tan, Xinmin Li, Wing San Tony Hung, Ulf Olofsson, Löwer Manuel","doi":"10.1007/s11249-024-01882-0","DOIUrl":"10.1007/s11249-024-01882-0","url":null,"abstract":"<div><p>PA66 is a commonly used material for plastic gears due to its excellent high-temperature resistance, high strength, self-lubrication, and friction resistance. In this study, the effect of different humidity levels on the tribological properties of PA66 materials in self-mated contacts are investigated using a pin-on-disk test rig. The results show that the friction coefficient and wear rate of the PA66-PA66 sliding combination increase drastically after humidity treatment mainly due to the surface plasticization caused by water absorption and the decrease of cohesive strength and glass transition temperature. Moreover, the limiting PV value of PA66 materials decreased significantly after moisture absorption, and when the actual PV value exceeds this reduced material limit, the degree of friction and wear increases drastically. The wear mechanism of the PA66-PA66 sliding combination is mainly adhesive wear without humidity treatment. The wear mechanism is adhesive wear combined with abrasive wear after humidity treatment (50%, 70%, 90%, immersion in water) and abrasive wear is most significant at 50% humidity. Abrasive wear decreases with the increase of the moisture content, while adhesive wear increases.</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":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513688","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

Wear in Progress: How Third Body Flow Controls Surface Damage 磨损进行时：第三体流如何控制表面损伤

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2024-07-02 DOI: 10.1007/s11249-024-01875-z

Olivier Bouillanne, Guilhem Mollon, Aurélien Saulot, Sylvie Descartes, Nathalie Serres, Guillaume Chassaing, Karim Demmou

{"title":"Wear in Progress: How Third Body Flow Controls Surface Damage","authors":"Olivier Bouillanne, Guilhem Mollon, Aurélien Saulot, Sylvie Descartes, Nathalie Serres, Guillaume Chassaing, Karim Demmou","doi":"10.1007/s11249-024-01875-z","DOIUrl":"10.1007/s11249-024-01875-z","url":null,"abstract":"<div><p>Mechanical contacts in dry conditions are often characterized by an interfacial layer called “third body”, which generally originates from the degradations of the surfaces, but which can exhibit strongly different material properties. This layer is a direct consequence of past wear, but also exerts a control on the rate at which surfaces in contact will keep getting worn. A comprehensive understanding of mechanical contacts therefore relies on a theory describing the interplay between this sheared layer and the moving surfaces which confine it. In this paper, we make a step towards such a theory by quantitatively investigating the link between the flow regime of the third body and the mechanical loading it applies to the surfaces. For that purpose, a previously developed local model of solid flow based on the Multibody Meshfree Approach is employed, in order to simulate characteristic flow regimes identified in experiments. Typical stress concentration patterns endured by the surfaces are then described and quantified, and a simple damage model is used to demonstrate how such a model could lead to wear prediction. We demonstrate that agglomerated flow regimes are prone to enhance large and deep damaging of surfaces, while granular third body flows have a more limited and shallow damaging effect.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513690","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

Tribological Investigation of Chemically Modified Polytetrafluoroethylene Coating for Hydrogen Valve Application 氢气阀门应用中化学改性聚四氟乙烯涂层的摩擦学研究

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2024-06-29 DOI: 10.1007/s11249-024-01869-x

Danavath Balu, Piyush Chandra Verma, Suresh Kumar Reddy Narala, R. Sujith, Prabakaran Saravanan

{"title":"Tribological Investigation of Chemically Modified Polytetrafluoroethylene Coating for Hydrogen Valve Application","authors":"Danavath Balu, Piyush Chandra Verma, Suresh Kumar Reddy Narala, R. Sujith, Prabakaran Saravanan","doi":"10.1007/s11249-024-01869-x","DOIUrl":"10.1007/s11249-024-01869-x","url":null,"abstract":"<div><p>Hydrogen embrittlement (HE) can cause catastrophic failure of stainless steel valve and related components in hydrogen refueling stations (HRSs), reducing reliability, safety and increasing the cost. Here, in this study, the ability of chemically modified polytetrafluoroethylene (CM-PTFE) coatings on steel substrates in reducing the HE susceptibility and, the friction and wear of valve parts, are explored due to its low hydrogen (H<sub>2</sub>) permeability and excellent solid lubrication. The solid lubrication properties of CM-PTFE-coated steel samples were investigated before and after H<sub>2</sub> charging at a pressure of 7 × 10<sup>5</sup> Pascals. After H<sub>2</sub> charging, the samples were subjected to CHNS and X-ray diffraction (XRD) analysis to quantify the percentage of H<sub>2</sub> absorption and its effect on crystallinity of the samples, respectively, and interesting insights were obtained from both CHNS and XRD analysis. Furthermore, the effect of H<sub>2</sub> charging on uncoated steel discs and CM-PTFE-coated discs were thoroughly investigated by hardness measurements, tribological characterization, wear behavior analysis of discs and pins and chemical elemental mapping. All test results are harmoniously suggesting that the H<sub>2</sub> charging indeed softened the material significantly. The developed double function CM-PTFE coatings can minimize H<sub>2</sub> permeability and also reduce friction, and wear of the components in HRSs.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549553","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

Temperature Dependence of Viscoelasticity of Lubricating Oil with Adsorptive Polymer Additives Sheared in Nanogaps 含吸附性聚合物添加剂的润滑油粘弹性在纳米间隙中剪切的温度依赖性

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2024-06-29 DOI: 10.1007/s11249-024-01884-y

Takumi Nozue, Shintaro Itoh, Naoya Okubo, Kenji Fukuzawa, Hedong Zhang, Naoki Azuma

{"title":"Temperature Dependence of Viscoelasticity of Lubricating Oil with Adsorptive Polymer Additives Sheared in Nanogaps","authors":"Takumi Nozue, Shintaro Itoh, Naoya Okubo, Kenji Fukuzawa, Hedong Zhang, Naoki Azuma","doi":"10.1007/s11249-024-01884-y","DOIUrl":"10.1007/s11249-024-01884-y","url":null,"abstract":"<div><p>Adsorptive polymer additives have been reported to improve the retention capacity of oil films under hydrodynamic lubrication and to reduce friction under boundary lubrication. These effects are believed to result from the formation of a polymer adsorption film on the surface that acts as a lubricious coating. Polymer adsorption films have become dominant in nanometer-order microscopic gaps. However, their mechanical properties are difficult to quantify. This hinders the development of polymer additives. In our previous study, we successfully measured the shear viscoelasticity of lubricants (base oils) sheared in nanogaps using an originally developed measurement method called the fiber wobbling method (FWM). In this study, we measured the shear viscoelasticity of polymer-added lubricants in nanogaps by using FWM. In addition, we developed a heating stage in the FWM to quantify the temperature dependence of shear viscoelasticity in nanogaps. As a result, the viscosity index improved and elasticity was observed in the nanogap, where the polymer adsorption film was dominant. Furthermore, our results indicated that the elasticity of the adsorbed polymer film originated from entropic elasticity.</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":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-024-01884-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513691","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

Preparation and Tribological Behavior of Silica Nano-Additives with Good Applicability for Both Polar and Non-Polar Base Oils 对极性和非极性基础油都具有良好适用性的二氧化硅纳米添加剂的制备和摩擦学特性

IF 2.9 3区工程技术

Tribology Letters Pub Date : 2024-06-26 DOI: 10.1007/s11249-024-01883-z

Jiajia Yao, Shuguang Fan, Ningning Song, Chuanping Gao, Shengmao Zhang, Yujuan Zhang

引用次数: 0