Tribology International最新文献

{"title":"Numerical analysis of rough surface characteristics and their contact behavior: The PSD Vs WM function generated self-affine fractal surfaces","authors":"Kai Jiang ,&nbsp;Zhifeng Liu ,&nbsp;Tao Zhang","doi":"10.1016/j.triboint.2025.110741","DOIUrl":"10.1016/j.triboint.2025.110741","url":null,"abstract":"<div><div>As is well known, rough surfaces exhibit self-affine fractal. Synthesized artificial fractal surfaces with the power spectral density (PSD) and Weierstrass-Mandelbrot (WM) function methods are employed to facilitate contact research on friction, wear and lubrication. Since these two methods are independent, it is challenging to control the input parameters and ensure the creation of identical artificial surfaces with same roughness parameters. Nevertheless, comparisons between them are necessary for engineering research. In this paper, based on Nayak’s random process theory, a power spectral density that incorporates the WM function is established. The mathematical expression for the fractal roughness <span><math><mi>G</mi></math></span> including <span><math><mi>H</mi></math></span>, <span><math><msub><mrow><mi>q</mi></mrow><mrow><mi>l</mi></mrow></msub></math></span>, <span><math><msub><mrow><mi>q</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span>, <span><math><mi>ζ</mi></math></span>, <span><math><msub><mrow><mi>h</mi></mrow><mrow><mi>rms</mi></mrow></msub></math></span> and <span><math><mi>M</mi></math></span> is then derived, using the definition of the root mean square roughness as a reference, to match the WM and PSD surfaces. Through extensive numerical simulations, the asperity overlap is quantified for the first time, with <span><math><mrow><mi>M</mi><mo>=</mo><mn>5</mn></mrow></math></span> specified, solving the problem of the WM function's inability to accurately represent rough surfaces. Additionally, we compare the multiasperity contact models with the Persson model. When the input parameters are the constant, rough surface characteristics and their contact behavior of the two surface types are nearly identical, so far both methods can be used for accurate simulation of fractal surfaces.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"209 ","pages":"Article 110741"},"PeriodicalIF":6.1,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864100","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}

{"title":"Surface profile modelling of inclined-axis polishing based on the microscopic material removal behaviour of abrasive particles","authors":"Zhao Wang ,&nbsp;Junfei Xu ,&nbsp;Yue Yang ,&nbsp;Zhi Han ,&nbsp;Yinghao Li ,&nbsp;Linyao Wu ,&nbsp;Fusheng Liang ,&nbsp;Cheng Fan","doi":"10.1016/j.triboint.2025.110738","DOIUrl":"10.1016/j.triboint.2025.110738","url":null,"abstract":"<div><div>As the final step in surface finishing, the polishing plays a critical role in determining the quality and precision of the target surface. Despite extensive research efforts centered on the Preston Equation for polishing processes, accurately capturing material removal at the zero-velocity point remains challenging. While some studies have explored material removal based on single abrasive particle behavior, these investigations have primarily focused on traditional flat polishing. There is a notable lack of research that examines material removal from the perspective of a single abrasive particle to predict polishing profiles in inclined-axis spherical polishing head applications. Therefore, this research establishes a surface profile model of inclined-axis fixed point polishing for spherical polishing head based on material removal of single abrasive particle. In which the abrasive particle sweep cross-section versus position relationships are considered, the abrasive particle movement trajectories are calculated, and multiple abrasive particle footprints overlapping strategy are set up. Polishing experiments were carried out, varying key parameters such as vertical feed depth, inclined angle, and dwell time. The outcomes reveal that the minimum error for predicting the cross-section maximum profile depth is only 6.25 %, and the contact profile is only 5.68 %, proves the precision of the model. In additions, the results also reveal that the best prediction condition for the model of vertical feed depth ≤ 0.2 mm, the inclined angle ≥ 15°, which is also the parameter condition for the formation of the approximate Gaussian profile during the experiment. The developed model is expected to not only enhance understanding of interaction mechanisms between abrasive particle- workpiece, including particle motion trajectories, but also offer practical guidance for optimizing polishing parameters and predicting surface outcomes in industrial manufacturing applications.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"209 ","pages":"Article 110738"},"PeriodicalIF":6.1,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860325","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}

{"title":"Mechanical degradation of 3D Cf-SiC composites at elevated temperature","authors":"Sourav Sarkar ,&nbsp;Manish Roy","doi":"10.1016/j.triboint.2025.110739","DOIUrl":"10.1016/j.triboint.2025.110739","url":null,"abstract":"<div><div>Carbon SiC (C_f-SiC) composites are finding increasing applications at elevated temperature because of their unique combination of mechanical and tribological properties. These composites are subjected to various degradation mechanisms during usage because of diverse field of applications. The intention of undertaking the present investigation is to understand and compare the material removal mechanisms of (C_f-SiC) composites subjected to impact abrasion, reciprocating wear at ambient and elevated temperature and hypersonic conditions. The results suggest that material is removed through crack formation and propagation during impact abrasion. As the test temperature is changed from ambient condition to 773 K during impact abrasion, the wear resistance of C_f-SiC composites varies from 48.47 to 41.88 under normal impact and from 7.68 to 9.59 during oblique impact. The formation of smooth self-lubricating tribo-layer governs friction during reciprocating wear. At higher load and higher temperature the formation of carbon dust occurs. The friction coefficient varies between 0.4 and 0.6 at low load. It increases to a high value at higher load and at 773 K. The main material removal mechanism during hypersonic condition is mechanical erosion although marginal ablation also takes place. Total material loss is 6.4 gm for 600 s exposure to hypersonic condition.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"209 ","pages":"Article 110739"},"PeriodicalIF":6.1,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878861","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}

{"title":"Fabrication and tribological mechanism of grease-containing self-lubricating composite epoxy coatings","authors":"Huixian Yang ,&nbsp;Xiaoqiang Fan ,&nbsp;Zhongpan Zhang ,&nbsp;Xinrui Li ,&nbsp;Minhao Zhu","doi":"10.1016/j.triboint.2025.110734","DOIUrl":"10.1016/j.triboint.2025.110734","url":null,"abstract":"<div><div>Epoxy resin (EP) exhibits poor tribological performance when used as a friction pair. In this study, lithium composite grease (LCG) was dispersed in EP using ethyl acetate as a “booster” to prepare composite coatings containing semi-solid grease (LCG/EP). X-ray computed tomography imaging confirmed the uniform distribution of LCG within the EP. The friction coefficient dropped from 0.65 to 0.066, and the wear rate decreased by 95.3 % with the introduction of 10 wt% LCG. The superior tribological performance of LCG/EP originates from the oil film formation on the friction surface. Moreover, the lubricating state from EP to LCG/EP was examined using Hertz contact theory. This work provides potentially effective support for the design of high-efficiency self-lubricating bearings.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"209 ","pages":"Article 110734"},"PeriodicalIF":6.1,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850546","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}

{"title":"Tribological analysis of rabinowitsch fluid in peristaltic flow with gold nanoparticle suspension","authors":"Zareen Zafar ,&nbsp;Ali B.M. Ali ,&nbsp;Mubbashar Nazeer ,&nbsp;Zulfiqar Ali ,&nbsp;Hala A. Hejazi ,&nbsp;Salah Saadaoui ,&nbsp;Refka Ghodhbani ,&nbsp;M. Ijaz Khan","doi":"10.1016/j.triboint.2025.110730","DOIUrl":"10.1016/j.triboint.2025.110730","url":null,"abstract":"<div><div>The current study focuses on convective heat and mass transfer of fluid-particle suspension flow of Rabinowitsch fluid in an inclined tube with ciliated walls. The objective of this theoretical study is to develop the mathematical model of the two-phase flow of Rabinowitsch fluid in peristaltic phenomena under the suspension of gold nanoparticles. The mathematical model for fluid and particle phases is constructed using partial differential equations of continuity, motion, energy, and mass concentration. The lubrication approach is used to simplify the equation and solve it by using MATHEMATICA 13.0 by using convective boundary conditions. The results for fluid, particle velocities, temperature, mass concentration, pressure gradient, and pressure rise are presented. From the computational data, it is noted that the Froude number and cilia tip parameter slow down the velocity of all fluids, and greater values of velocity are predicted at the core region of the tube for the case of Newtonian and Pseudoplastic fluids. The concentration profiles of Newtonian and Pseudoplastic fluids are diminishing versus Schmidt and Soret numbers. It is also observed that the particle phase velocity is 4 % greater than the fluid phase in the case of Pseudoplastic fluid. The present work can be used in the medical field to cure goiter glands, remove allergens from our nostrils with the help of cilia, and in the identification of damaged human body organs.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"209 ","pages":"Article 110730"},"PeriodicalIF":6.1,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844518","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}

{"title":"Tightening performance of dual-nut connecting bolts with different height ratios and torque ratios","authors":"Wanzhi Zhou,&nbsp;Chongkai Fan,&nbsp;Wenwen Jiang,&nbsp;Dachang Zhang","doi":"10.1016/j.triboint.2025.110733","DOIUrl":"10.1016/j.triboint.2025.110733","url":null,"abstract":"<div><div>This paper investigates the tightening performance of dual-nut connecting bolts. The torque ratio <em>T</em>₂/<em>T</em>₁ is defined as the ratio of the slave nut (i.e., S-nut) torque <em>T</em>₂ to the master nut (i.e., M-nut) torque <em>T</em>₁, and the definition of the height ratio <em>h</em>₂/<em>h</em>₁ is consistent with the torque ratio. Four torque ratios and five height ratios were used as parameters for tightening tests to reveal the variation of the axial force of bolts. Then, a parametric finite element model was established to reveal the contact characteristics of M-nut and S-nut, further analyzing the influence of S-nut on the additional tension of the bolt. The results demonstrate that the axial force of the bolt is largest when both M-nut and S-nut torques are maximized. Furthermore, the axial force of the bolt improves with the increase of <em>T</em>₂/<em>T</em>₁, and the maximum is four times the initial axial force. When <em>T</em>₂/<em>T</em>₁ is four, the axial force of the bolt changes significantly with the height ratio <em>h</em>₂/<em>h</em>₁. Specifically, if <em>h</em>₂/<em>h</em>₁ is less than one, the axial force decreases as the height ratio increases, while the inverse is true when <em>h</em>₂/<em>h</em>₁ is greater than one. Additionally, the additional tensile force is almost equal to the axial force of the bolt when the <em>T</em>₂ increases to approximately 1.5 times that of the M-nut. Finally, the dual-nut tightening theory established in the paper can reveal the distribution of axial force in the threaded area and the trend of axial force variation of bolts during the S-nut tightening process.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"209 ","pages":"Article 110733"},"PeriodicalIF":6.1,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848219","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}

{"title":"Adsorption behavior regulates the frictional response of a solid-liquid system: A case study of the ZrN-Cu/bovine serum albumin solution system","authors":"Xinmeng Wu ,&nbsp;Dengji Zhu ,&nbsp;Shunuo Bian ,&nbsp;Haiwei Han ,&nbsp;Lihua Yu ,&nbsp;Junhua Xu ,&nbsp;Bin Zuo","doi":"10.1016/j.triboint.2025.110727","DOIUrl":"10.1016/j.triboint.2025.110727","url":null,"abstract":"<div><div>Coated artificial joint implants and the surrounding tissue fluid are a solid-liquid system, and the tribological behavior of this system is an important factor to evaluate the service performance of the implants, which has received continuous attention. Here, we investigated the tribological behavior of ZrN-Cu films in bovine serum albumin(BSA) solution. The results show that Cu can effectively improve the tribological performance of the ZrN-Cu/BSA system. Through the investigation of the tribochemical products, adsorption behavior, hertzian contact stress, flash temperature, etc., we elucidated the improving mechanism of the ZrN-Cu/BSA system, forming a carbon-based transfer film deriving from BSA with the catalytically active ZrN-Cu film and a stable surface adsorption layer due to Cu separating the contact surface.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"209 ","pages":"Article 110727"},"PeriodicalIF":6.1,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143837883","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}

{"title":"Tribological properties of ultralight and biomimetic helical composites reinforced by low-content carbon fiber from direct ink writing 3D printing","authors":"Shengkai Liu ,&nbsp;Yan Geng ,&nbsp;Chunying Min ,&nbsp;Xiaoyuan Pei ,&nbsp;Siqi Liu ,&nbsp;Amna Siddique ,&nbsp;Zhiwei Xu","doi":"10.1016/j.triboint.2025.110729","DOIUrl":"10.1016/j.triboint.2025.110729","url":null,"abstract":"<div><div>This study explores direct ink writing (DIW) 3D printing for fabricating ultralight biomimetic helical carbon fiber composites. Composites with varying interlaminar angles (0°-40°) were compared to mold-formed samples in terms of tribological performance. The DIW method improved fiber orientation and interfacial bonding, significantly enhancing mechanical and wear properties. A 10° helical angle yielded over 50 % reductions in both friction coefficient and wear rate, along with high hardness and modulus. The printed composite achieved ultralow density (0.467 g/cm³) while maintaining structural integrity. These findings demonstrate the potential of DIW-fabricated helical composites for lightweight, durable applications in aerospace, automotive, and other high-performance engineering fields.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"209 ","pages":"Article 110729"},"PeriodicalIF":6.1,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844517","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}

{"title":"Evolution processes of electrical discharge in EHD contact lubricated with conductive grease","authors":"Jinjie Liu ,&nbsp;Qinghua Bai ,&nbsp;Xinming Li ,&nbsp;Li Zhang ,&nbsp;Florian Pape ,&nbsp;Feng Guo ,&nbsp;Gehard Poll","doi":"10.1016/j.triboint.2025.110725","DOIUrl":"10.1016/j.triboint.2025.110725","url":null,"abstract":"<div><div>Conductive grease is generally considered to mitigate electrically induced bearing damage (EIBD), but the underlying mechanisms remain unclear. The grease analysis and electrical discharge tests were conducted using a ball-on-disc rig to characterize the lubrication and electrical properties of conductive greases with ionic liquid, while recording the evolution of electrical discharge processes in EHD contacts lubricated with conductive grease. Firstly, the grease analysis demonstrates that the addition of ionic liquids alters the electrical properties of the lubricant, resulting in higher dielectric strength and conductivity of the grease. Secondly, electrical discharge test results indicate that the discharge behavior is significantly influenced by the EHL characteristics and lubricant properties. Meanwhile, electrical discharge induces film recession and fluctuation, primarily caused by Joule heating and localized pressure variations. Test results show that higher conductivity and viscosity lubricant can effectively reduce the recession of lubrication caused by electrical discharge. A correction factor was established for predicting lubrication under the electric field, and the calculated film thickness aligns well with the measured film thickness in full film lubrication. The comparison between corrected and measured film thickness further validates the discharge characteristics and mechanism of conductive grease.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"209 ","pages":"Article 110725"},"PeriodicalIF":6.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143834176","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}

{"title":"Prediction of fretting fatigue lifetime of dovetail joints using a Modified Theory of Critical Distances","authors":"Qiqi Xiao ,&nbsp;Can Wang ,&nbsp;Bilal Ahmed ,&nbsp;Dagang Wang ,&nbsp;Zhenbing Cai ,&nbsp;Lihua Wang ,&nbsp;Magd Abdel Wahab","doi":"10.1016/j.triboint.2025.110728","DOIUrl":"10.1016/j.triboint.2025.110728","url":null,"abstract":"<div><div>Dovetail joints are widely used in mechanical systems and aerospace applications. Under cyclic loading conditions, they are susceptible to fretting fatigue, which can lead to premature failure. Therefore, improving the accuracy of lifetime prediction under fretting fatigue is crucial. In dovetail joints, fretting conditions result in a complex stress-strain distribution on the contact surface, affecting the applicability of different failure criteria. This study examines the stress states across various models and evaluates the suitability of each criterion accordingly. The accuracy of crack initiation angle prediction for two types of dovetail joints is improved. The maximum principal stress serves as a reference for extreme stress, while the stress gradient describes the rate of change in stress. The combination of stress gradient and maximum principal stress provides a more comprehensive representation of stress distribution. The traditional Theory of Critical Distances (TCD) is unable to effectively address the complex stress distribution in stress concentration areas. To overcome this limitation, a Modified TCD (MTCD) is proposed, integrating the effects of stress gradients and maximum principal stress into the original TCD framework. The MTCD method significantly improves the accuracy of predicting the initiation lifetime of both dovetail joints compared to the traditional TCD method. This study not only enhances the understanding of fretting fatigue behavior in dovetail joints but also provides a reliable predictive tool for evaluating more complex models of dovetail joints.</div></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":"209 ","pages":"Article 110728"},"PeriodicalIF":6.1,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860449","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}