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A contact model for elastic-plastic rough spheres
IF 6.1 1区 工程技术
Tribology International Pub Date : 2025-02-05 DOI: 10.1016/j.triboint.2025.110578
Shi-Wen Chen, Gang-Feng Wang
{"title":"A contact model for elastic-plastic rough spheres","authors":"Shi-Wen Chen,&nbsp;Gang-Feng Wang","doi":"10.1016/j.triboint.2025.110578","DOIUrl":"10.1016/j.triboint.2025.110578","url":null,"abstract":"<div><div>The contact of rough spheres is critical in many fields, yet analyzing the effects of roughness and plasticity on the load-area relation is challenging. This paper presents a model for rough elastic-plastic spheres in contact with a rigid plane. Using finite element simulations, we derive an explicit expression for contact pressure in smooth elastic-plastic spheres. For rough spheres, the local load is estimated from this expression, and the local real contact area is determined by the contact behavior of nominally flat elastic-plastic solids, which is established for whole-range using finite element method. By integrating across the contact region, the total real contact area is calculated. The model aligns well with finite element and experimental results, confirming its accuracy and applicability.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"206 ","pages":"Article 110578"},"PeriodicalIF":6.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143348752","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
Achieving high temperature lubrication of MoS2-Bi2O3 nanoparticles composite: Through the formation of nanocrystalline ternary oxide and glaze layer
IF 6.1 1区 工程技术
Tribology International Pub Date : 2025-02-03 DOI: 10.1016/j.triboint.2025.110577
Xibo Shao , Yi Ren , Kun Guo , Chengfeng Du , Xianzong Wang , Jiao Chen , Jianxi Liu , Long Wang , Jun Yang
{"title":"Achieving high temperature lubrication of MoS2-Bi2O3 nanoparticles composite: Through the formation of nanocrystalline ternary oxide and glaze layer","authors":"Xibo Shao ,&nbsp;Yi Ren ,&nbsp;Kun Guo ,&nbsp;Chengfeng Du ,&nbsp;Xianzong Wang ,&nbsp;Jiao Chen ,&nbsp;Jianxi Liu ,&nbsp;Long Wang ,&nbsp;Jun Yang","doi":"10.1016/j.triboint.2025.110577","DOIUrl":"10.1016/j.triboint.2025.110577","url":null,"abstract":"<div><div>Molybdenum disulfide (MoS<sub>2</sub>) is an excellent lubricant used in aerospace. Its ability to lubricate and resist wear at temperatures above 400 °C remains a significant challenge, due to its high temperature oxidation. Herein, we demonstrate that excellent high-temperature lubrication can be achieved with coefficient of friction (COF) of 0.21–0.26 at 450–800 ℃ by compounding bismuth oxide (Bi<sub>2</sub>O<sub>3</sub>) nanoparticles with MoS<sub>2</sub>. The improvement of tribological properties above 450 ℃ was due to the synergistic lubrication of MoS<sub>2</sub> and Bi<sub>2</sub>O<sub>3</sub>. When the temperature was higher than 600 ℃, the tribo-chemical reaction driven by continuous stress and temperature, induced the formation of new ternary oxides (Bi<sub>2</sub>MoO<sub>6</sub> and Bi<sub>2</sub>Mo<sub>3</sub>O<sub>12</sub>) with low shearing nano-grain structure, and a continuous dense lubricating glaze layer composed of Bi<sub>2</sub>O<sub>3</sub>, MoO<sub>3</sub>, Bi<sub>2</sub>MoO<sub>6</sub> and Bi<sub>2</sub>Mo<sub>3</sub>O<sub>12</sub> was formed at the friction interface. In Bi<sub>2</sub>MoO<sub>6</sub> layered structure, the distortion of MoO<sub>6</sub> octahedral structure led to the increase of interlayer distance, which weakened the coupling effect between ions, thus contributing to low shear strength and good lubricity. Our research indicates that the formation of low shear strength Bi<sub>2</sub>MoO<sub>6</sub> ternary oxide is helpful to the realization of high temperature lubrication, which provides a strategy to expand the high temperature lubrication range of MoS<sub>2</sub>-based solid lubricant.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"206 ","pages":"Article 110577"},"PeriodicalIF":6.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143330526","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
Elastohydrodynamic lubrication of aqueous hydroxyethyl cellulose-glycerol lubricants
IF 6.1 1区 工程技术
Tribology International Pub Date : 2025-02-03 DOI: 10.1016/j.triboint.2025.110563
Jan Ulrich Michaelis , Sandra Kiese , Stefan Hofmann , Thomas Lohner , Peter Eisner
{"title":"Elastohydrodynamic lubrication of aqueous hydroxyethyl cellulose-glycerol lubricants","authors":"Jan Ulrich Michaelis ,&nbsp;Sandra Kiese ,&nbsp;Stefan Hofmann ,&nbsp;Thomas Lohner ,&nbsp;Peter Eisner","doi":"10.1016/j.triboint.2025.110563","DOIUrl":"10.1016/j.triboint.2025.110563","url":null,"abstract":"<div><div>Continuous growth in lubricant volume worldwide, environmental hazard of fossil-based lubricants and anthropogenic climate change are reflected in an increasing demand for green, sustainable lubrication. In the presented work, the influence of molecular mass of hydroxyethyl celluloses on rheology, elastohydrodynamic friction and film thickness of aqueous lubricants was investigated experimentally. Polyalphaolefin and polyethylene glycol were used as reference lubricants. All lubricants were formulated to have the same dynamic zero-shear viscosity. The average molar mass of commercial hydroxyethyl cellulose was adjusted by enzymatic hydrolysis. 40 to 70<!--> <!-->wt% glycerol were added to improve the film formation capability and high-shear viscosity. The results indicate that commercial hydroxyethyl celluloses with weight average molar masses above 88<!--> <!-->kg<!--> <!-->mol<sup>-1</sup> are not suitable to increase elastohydrodynamic film thickness due to shear-thinning even at moderate shear rates. Hydrolysis increased the critical shear stress by an order of magnitude to 1.13 × 10<sup>4</sup> <!-->Pa. Compared to the reference lubricants, elastohydrodynamic friction was reduced by more than 90<!--> <!-->%. Nevertheless, due to the pronounced shear-thinning behavior, a weight average molar mass of 19<!--> <!-->kg<!--> <!-->mol<sup>-1</sup> seems to represent a threshold for relevant lubricant film formation in elastohydrodynamically lubricated contacts. Overall, the results show that the combination of hydroxyethyl cellulose and glycerol is well suited for viscosity modification of aqueous lubricants.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"206 ","pages":"Article 110563"},"PeriodicalIF":6.1,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143348753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Evaluating surface texturing technologies of rubber composites on ice using a novel high-velocity tribotest method
IF 6.1 1区 工程技术
Tribology International Pub Date : 2025-01-31 DOI: 10.1016/j.triboint.2025.110538
Sara Zahmatkesh, Reza Rizvi
{"title":"Evaluating surface texturing technologies of rubber composites on ice using a novel high-velocity tribotest method","authors":"Sara Zahmatkesh,&nbsp;Reza Rizvi","doi":"10.1016/j.triboint.2025.110538","DOIUrl":"10.1016/j.triboint.2025.110538","url":null,"abstract":"<div><div>This study presents a high-velocity tribotest using Bruker UMT Tribolab to evaluate the ice traction of rubber composites. Lab-scale tribotests are essential for developing anti-slip materials for footwear. Reciprocating and rotational movements were studied on ice, along with the physical phenomena influencing friction, optimizing dwell time and load control parameters. GF-TPU composites and commercial winter boots (Green Diamond® and Arctic Grip Vibram®) were tested for validation. The addition of 10 wt% glass fibers to TPU increased static friction by 300 % and kinetic friction by 400 %, enhancing stick-slip behavior. SiC-based texturing in Green Diamond composites improved static friction by 160 % and kinetic friction by 970 %. Arctic Grip samples showed a 440 % increase in static friction and over 1000 % in kinetic friction.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"206 ","pages":"Article 110538"},"PeriodicalIF":6.1,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143330525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 and numerical investigation of the Ti-Ni-Cu coating on AZ91D magnesium alloy by laser surface-modification: The microstructure, wear and corrosion behavior
IF 6.1 1区 工程技术
Tribology International Pub Date : 2025-01-30 DOI: 10.1016/j.triboint.2025.110565
Duncai Bao , Boxiang Hong , Chenfeng Yuan , Lipeng Jiang , Xun Zhang , Qian Li , Xiang Li , Zhaoxue Deng
{"title":"Experimental and numerical investigation of the Ti-Ni-Cu coating on AZ91D magnesium alloy by laser surface-modification: The microstructure, wear and corrosion behavior","authors":"Duncai Bao ,&nbsp;Boxiang Hong ,&nbsp;Chenfeng Yuan ,&nbsp;Lipeng Jiang ,&nbsp;Xun Zhang ,&nbsp;Qian Li ,&nbsp;Xiang Li ,&nbsp;Zhaoxue Deng","doi":"10.1016/j.triboint.2025.110565","DOIUrl":"10.1016/j.triboint.2025.110565","url":null,"abstract":"<div><div>Magnesium alloys are easily exposed to wear and corrosion during service life, hindering their applications. Herein, the Ti-Ni-Cu coatings were designed. Thermal-mechanical simulation of laser cladding on magnesium alloy surface was performed for exploring the optimal cladding parameters. Form the simulation results, laser power of 1200 W, scanning speed of 20 mm/s and spot diameter of 3 mm were applied. A series of characterizations were performed to study the microstructure, corrosion and wear properties of the coating. The results indicated Ni<sub>52.5</sub>Ti<sub>33.5</sub>Cu<sub>14</sub> coating presented the comprehensively enhanced wear resistance than the substrate. Specifically, an increase in coatings’ microhardness by a factor of 6 over substrate was achieved. Besides, the <em>I</em><sub>corr</sub> was one order of magnitude lower than that of the substrate.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"205 ","pages":"Article 110565"},"PeriodicalIF":6.1,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102803","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 and simulation study of bio-inspired adaptive transverse wave microgrooves for underwater drag reduction
IF 6.1 1区 工程技术
Tribology International Pub Date : 2025-01-28 DOI: 10.1016/j.triboint.2025.110564
Shan Lu , Jianbo Liu , Hang Li , Liguo Qin , Zheng Wang , Yuhao Wu , Zeyu Ma , Qiao Hu
{"title":"Experimental and simulation study of bio-inspired adaptive transverse wave microgrooves for underwater drag reduction","authors":"Shan Lu ,&nbsp;Jianbo Liu ,&nbsp;Hang Li ,&nbsp;Liguo Qin ,&nbsp;Zheng Wang ,&nbsp;Yuhao Wu ,&nbsp;Zeyu Ma ,&nbsp;Qiao Hu","doi":"10.1016/j.triboint.2025.110564","DOIUrl":"10.1016/j.triboint.2025.110564","url":null,"abstract":"<div><div>Inspired by the flexible skin of dolphins and the hydrophobic effect of lotus leaves, this study developed an adaptive drag reduction surface using biomimetic structures. The design combines a transverse groove base with hydrophobic flexible materials, employing hydraulic actuation for active surface morphing. This approach effectively integrates non-smooth structures, flexible surfaces, and hydrophobic drag reduction technologies, achieving up to 28 % drag reduction at a flow velocity of 0.2 m/s. This adaptive technology offers a robust solution for drag reduction across varying flow velocities in complex underwater environments.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"205 ","pages":"Article 110564"},"PeriodicalIF":6.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102802","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
Effect of water contamination of an environmentally acceptable lubricant based on synthetic esters on the wear and hydrodynamic properties of stern tube bearing
IF 6.1 1区 工程技术
Tribology International Pub Date : 2025-01-28 DOI: 10.1016/j.triboint.2025.110562
Michał Wodtke, Jacek Frost, Wojciech Litwin
{"title":"Effect of water contamination of an environmentally acceptable lubricant based on synthetic esters on the wear and hydrodynamic properties of stern tube bearing","authors":"Michał Wodtke,&nbsp;Jacek Frost,&nbsp;Wojciech Litwin","doi":"10.1016/j.triboint.2025.110562","DOIUrl":"10.1016/j.triboint.2025.110562","url":null,"abstract":"<div><div>The ecological aspects of the lubrication of bearings on ships represent a critical challenge today. Oil leakages are a typical issue, even for new systems, similarly to water ingress from the environment. One of the options for improving environmental protection is replacing mineral oil with an environmentally adaptable lubricant (EAL). This paper reports experimental investigations of the effect of water in the EAL lubricant on the performance of a hydrodynamic journal bearing. Bearings were tested on dedicated test stands in steady and transient states. The results revealed that a mixture of synthetic EAL esters with water, when used as a lubricant in a laboratory test of journal bearings, did not significantly alter the hydrodynamic and wear performance of the system.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"205 ","pages":"Article 110562"},"PeriodicalIF":6.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143093529","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
Improving tribological performance of electrified steel interfaces in e-mobility systems using ash-sulfur-less oil additives based on amine salts-phosphoric esters
IF 6.1 1区 工程技术
Tribology International Pub Date : 2025-01-28 DOI: 10.1016/j.triboint.2025.110561
Mohamed Kamal Ahmed Ali , Yuchen Sun , Chaoyang Zhang , Qiangliang Yu , Chen Zhao , Feng Zhou , Weimin Liu
{"title":"Improving tribological performance of electrified steel interfaces in e-mobility systems using ash-sulfur-less oil additives based on amine salts-phosphoric esters","authors":"Mohamed Kamal Ahmed Ali ,&nbsp;Yuchen Sun ,&nbsp;Chaoyang Zhang ,&nbsp;Qiangliang Yu ,&nbsp;Chen Zhao ,&nbsp;Feng Zhou ,&nbsp;Weimin Liu","doi":"10.1016/j.triboint.2025.110561","DOIUrl":"10.1016/j.triboint.2025.110561","url":null,"abstract":"<div><div>This study introduces the formulation of an ash-sulfur-less lubricant that is designed to form an antiwear/insulating tribolayer on electrified steel surfaces. The proposed oil formulation utilizes amine salts of aliphatic phosphoric acid esters (AW-6110) in poly-α-olefin (PAO6) oil. The study aims to find a solution to address tribological issues resulting from electrification effects and the presence of sulfur in e-mobility oils. An SRV-IV tribometer evaluated the tribological performance under various conditions. Notably, the AW-6110-formulated oil (1.5-AW oil) exhibited superior performance under 9 A current, reducing the friction coefficient by 18 % and the disc wear volume by 90 % compared to the commercial oil used in electric vehicles. This enhancement is attributed to its exceptional ability to form a durable antiwear/insulating tribolayer.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"205 ","pages":"Article 110561"},"PeriodicalIF":6.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102804","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
Adhesion-grasping behavior of a mechanical gripper based on thermoresponsive smart wood
IF 6.1 1区 工程技术
Tribology International Pub Date : 2025-01-27 DOI: 10.1016/j.triboint.2025.110558
Xiaodong Wang , Yaodong Li , Rui Lei , Xiaolei Guo , Run Zhang
{"title":"Adhesion-grasping behavior of a mechanical gripper based on thermoresponsive smart wood","authors":"Xiaodong Wang ,&nbsp;Yaodong Li ,&nbsp;Rui Lei ,&nbsp;Xiaolei Guo ,&nbsp;Run Zhang","doi":"10.1016/j.triboint.2025.110558","DOIUrl":"10.1016/j.triboint.2025.110558","url":null,"abstract":"<div><div>The challenge of grasping thin sheets, slender objects, and granular objects has hampered the development of mechanical grippers. In this investigation, thermoresponsive polymers and chemically treated wood were combined to develop a novel mechanical gripper with adjustable adhesion force. By switching between hot and cold water inside the mechanical gripper, the gripper could grasp and release a variety of objects. Further study revealed that the adhesion force of the mechanical gripper was related to temperature, contact area, and the material of the grasped object. Finally, the adhesion force equation was established to promote the application of the mechanical gripper.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"205 ","pages":"Article 110558"},"PeriodicalIF":6.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143093528","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
Hybrid high-temperature wear mechanisms of additive manufactured Ti-6Al-4V alloy
IF 6.1 1区 工程技术
Tribology International Pub Date : 2025-01-27 DOI: 10.1016/j.triboint.2025.110559
Ruiwen Xu , Yi Zhu , Jianxiong Wu , Pengfei Huang , Ming Wu , Wujun Wang , Chao Zhang , Huayong Yang
{"title":"Hybrid high-temperature wear mechanisms of additive manufactured Ti-6Al-4V alloy","authors":"Ruiwen Xu ,&nbsp;Yi Zhu ,&nbsp;Jianxiong Wu ,&nbsp;Pengfei Huang ,&nbsp;Ming Wu ,&nbsp;Wujun Wang ,&nbsp;Chao Zhang ,&nbsp;Huayong Yang","doi":"10.1016/j.triboint.2025.110559","DOIUrl":"10.1016/j.triboint.2025.110559","url":null,"abstract":"<div><div>This study investigates the high-temperature wear of additive-manufactured Ti6Al4V alloy against GH2132. The wear mechanism transitioned from abrasive and adhesive wear to oxidative wear with rising temperatures. The microstructure characteristics reveal the special hybrid high-temperature wear mechanisms: shear deformation-induced wear hardening and dynamic recrystallization-induced wear softening. At lower temperatures, the thinner oxide layer was easily removed and the worn surface in contact underwent work hardening, reducing the negative effects of thermal softening. At higher temperatures, the thicker oxide layer slightly reduced adhesive of the substrate but failed due to cracking and spalling. Combined with intensified thermal softening, recrystallization softening on the worn surface not only eliminated surface hardening but led to a sharp decline in wear resistance.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"205 ","pages":"Article 110559"},"PeriodicalIF":6.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102805","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
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