Tribology Letters最新文献

{"title":"Numerical and Experimental Study of a Sector-Shaped Surface Texture in Friction Reduction","authors":"Yuan Wei,&nbsp;Haoming Yan,&nbsp;Shuang Li,&nbsp;Xuewen Wang","doi":"10.1007/s11249-024-01863-3","DOIUrl":"10.1007/s11249-024-01863-3","url":null,"abstract":"<div><p>Reducing friction using lubricant is of great significance to reducing energy consumption and extending the life of machinery. Surface texturing is effective to enhance the lubrication condition, and it is crucial to properly design the texture’s morphology. In this study, a sector-shaped surface texture is designed and demonstrated using both numerical and experimental methods. A computational fluid dynamic method based on Navier–Stokes equations and a two-phase cavitation model is performed to evaluate the effect of the texture in the hydrodynamic lift and to optimize the geometrical parameters of the texture. The mechanism associated with the additional hydrodynamic pressure generation is also revealed according to the results of the simulation. Then, pin-on-disk rotary friction experiments are performed on steel disks textured by a femtosecond laser to verify the lubricant effect of the proposed texture. The results of the experiment suggest that the sector-shaped textures reduce friction more than conventional circle-shaped textures, which coincides well with the results of the simulation.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140889591","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}

{"title":"Tribological Investigations on Additively Manufactured Inconel 718 Features with Silicon Carbide Ball: Role of the Tribo-Oxide Layer","authors":"M. M. Basha,&nbsp;M. R. Sankar,&nbsp;T. S. R. Ch. Murthy,&nbsp;A. K. Sahu,&nbsp;S. Majumdar","doi":"10.1007/s11249-024-01858-0","DOIUrl":"10.1007/s11249-024-01858-0","url":null,"abstract":"<div><p>The current investigation delved into the friction and wear characteristics of abrasive-finished Inconel 718 alloys fabricated by additive manufacturing and casting methods. Silicon carbide balls were used as counter-body materials for all tribology tests. Variable loads of 10 N, 20 N, and 30 N were applied, along with frequencies of 5 Hz and 15 Hz, while maintaining a 1 mm stroke length for 30 min. Cast samples showed an increase in coefficient of friction (COF) when the load increased from 10 to 20 N at 5 Hz. COF value was decreased from 0.28 to 0.25 when the load was increased from 20 to 30 N while the frequency was maintained at 5 Hz. At the same frequency of 5 Hz, additively manufactured samples displayed a constant increase in COF from 0.19 to 0.35 as the load increased from 10 to 30 N. Consistent COF values were determined at 15 Hz for cast and additively manufactured samples. The COF for cast samples at a frequency of 15 Hz was 0.26, 0.25, and 0.25 for loads of 10 N, 20 N, and 30 N, respectively. For the same loads and frequencies, COF values of 0.23, 0.24, and 0.24 were reported in additively manufactured samples. At 15 Hz, both cast (7.25 × 10^–6 mm³/N.m to 9.91 × 10^–6 mm³/N.m) and additively manufactured (5.80 × 10^–6 mm³/N.m to 6.18 × 10^–6 mm³/N.m) samples exhibited constant increasing trends of specific wear rates when the loads increased from 10 to 30 N.</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":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140834079","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}

{"title":"The Effect of Stiffness on Friction, Surface Strain and Contact Area of a Sliding Finger Pad Simulant","authors":"Zing Siang Lee,&nbsp;Raman Maiti,&nbsp;Matt Carré,&nbsp;Roger Lewis","doi":"10.1007/s11249-024-01861-5","DOIUrl":"10.1007/s11249-024-01861-5","url":null,"abstract":"<div><p>This study investigates the frictional and surface strain behaviour of silicone hemispherical finger pad simulants with different stiffness during tribological interactions with a smooth glass plate. A novel contact area and strain measurement method employing a digital image correlation technique was employed to give new understanding of the pad behaviour during sliding. The frictional behaviour of the sliding finger pad simulant is dominated by the adhesion mechanism, with a small overall contribution from deformation, as suggested by the high principal strains at the edge of the contact area. The strain behaviour is also influenced by the magnitude of the normal force and the stiffness of the samples.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-024-01861-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140833994","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}

{"title":"Effect of Nickel Acetyl Acetonate as Lubricant Additive in Base Oils with Different Molecular Structure on In-Situ Formation and Tribomechanism of Carbon-Based Tribofilms of Steel-Steel Sliding Pair","authors":"Feng Peng,&nbsp;Shuguang Fan,&nbsp;Ningning Song,&nbsp;Chuanping Gao,&nbsp;Shengmao Zhang,&nbsp;Yujuan Zhang","doi":"10.1007/s11249-024-01859-z","DOIUrl":"10.1007/s11249-024-01859-z","url":null,"abstract":"<div><p>Nickel acetyl acetonate (Ni(acac)₂), a metal-organic compound, was directly dispersed in base oils alkylated naphthalene (AN-5), diisooctyl sebacate (DIOS), poly-α-olefin (PAO6), and mineral oil (liquid hydrocarbon mixtures:150 N) in the presence of commercial dispersant RF1151 (monoallyl poly(isobutylene succinimide). The tribological properties of the lubricants were tested with a four-ball friction and wear tester. The friction-induced in-situ formation of carbon films on rubbed steel surfaces under the catalysis of Ni(acac)₂ was investigated, and the as-formed carbon films were characterized by scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The results show that Ni(acac)₂ added in the base oils can decompose to form metallic nickel to form nickel layer on the rubbed metal sub-surfaces and catalyze the degradation of the base oil molecules adsorbed to form carbon-based tribofilms. The carbon film formed from AN-5 with aromatic ring structure has a high degree of graphitization and the best friction-reducing and antiwear abilities, and those formed from PAO6 and 150 N with linear structure have a low degree of graphitization as well as good tribological properties. Under the lubrication of DIOS with Ni(acac)₂, however, there is no carbon film formation while the tribological properties of the lubricant are relatively poor, due to the absence of the catalytic metallic nickel and nickel oxide layer on the rubbed metal sub-surface. Thanks to the catalytic effect of metallic nickel released from Ni(acac)₂ for the degradation of various base oils with different molecular structure, the present approach could provide a rational pathway to tune the in-situ formation of carbon-based tribofilm on rubbed steel surfaces so as to effectively reduce the friction and wear of steel-steel sliding pair.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140657778","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}

{"title":"Commensurability-Dependent Phononic Superlubricity Between Molybdenum Disulfide Layers","authors":"Yun Dong,&nbsp;Bo Shi,&nbsp;Yi Tao,&nbsp;Xinyi Tang,&nbsp;Jinguang Wang,&nbsp;Yifan Liu,&nbsp;Futian Yang","doi":"10.1007/s11249-024-01850-8","DOIUrl":"10.1007/s11249-024-01850-8","url":null,"abstract":"<p>This paper decodes the dependence of phononic superlubricity on commensurability caused by relative rotation between molybdenum disulfide (MoS₂) layers. Results show that under commensurate state, due to the strong interfacial potential, the sliding probe exhibits obvious stick–slip phenomenon; the vibration frequencies of the probe and the substrate are coupled, constructing effective energy transfer channels. As the rotation angle increases, the stick–slip phase and probe inherent oscillation are coupled owing to the decreasing interfacial potential. Once the contacting state reaches to completely incommensurability, the probe only undergoes inherent oscillation. More importantly, we further find that the potential period is determined by the lattice period, which causes the frequency distribution of the excited phonons to remain unchanged although changes in rotation angle. In addition, the contribution of atoms adjacent to friction interface to frictional energy dissipation becomes more significant with the rotation angle increasing. These findings reveal the phononic mechanism of angle-dependent superlubricity between MoS₂ layers and provide a viable approach for friction regulation.</p>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140655537","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}

{"title":"Investigating the Roles of Protein on the Cobalt Alloy Surface Degradation for Biomedical Implant Through Tribocorrosion Mechanisms","authors":"Mohamad Taufiqurrakhman,&nbsp;Thawhid Khan,&nbsp;Michael G. Bryant","doi":"10.1007/s11249-024-01862-4","DOIUrl":"10.1007/s11249-024-01862-4","url":null,"abstract":"<div><p>Previous investigation has established the formation of tribofilm is influenced by tribochemical reactions between the electrolyte and the articulating surface of cobalt alloy through sliding tests in various simulated fluids. Although it has successfully characterized the film composition via spectroscopy analysis and indicated to have impact on material loss, a comprehensive understanding of the material degradation mechanism in tribocorrosion condition was still lacking. Therefore, this study aims to investigate the role of protein in the tribocorrosive degradation of cobalt-chromium-molybdenum (CoCrMo) alloy in different simulated physiological electrolytes. Using a similar testing protocol, tribocorrosion tests were conducted with reciprocating ceramic ball against CoCrMo samples immersed in saline and culture medium, compared to both electrolytes diluted with 25% fetal bovine serum (FBS). Synergistic and mechanistic approaches were employed to model the tribocorrosive degradation. Results reveal that protein plays a beneficial role in reducing corrosive (electrochemical) surface degradation under tribocorrosion condition, whilst increasing mechanical wear degradation in the process. Despite studies have shown that tribocorrosion behavior in metal alloys is highly influenced by the presence of organic matter, this study provides a more clarity of the roles played by protein in tribocorrosive degradation on CoCrMo surface as its novel finding.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-024-01862-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140662127","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}

{"title":"Single-Bubble Cavitation-Induced Pitting on Technical Alloys","authors":"Jonas Kühlmann,&nbsp;Sebastian A. Kaiser","doi":"10.1007/s11249-024-01851-7","DOIUrl":"10.1007/s11249-024-01851-7","url":null,"abstract":"<div><p>Repeated single cavitation bubble experiments were performed primarily on 316L stainless steel, and some on nickel–aluminum–bronze (NAB) and pure aluminum. The bubble dynamics were recorded with two high-speed cameras and correlated with surface images, also acquired in situ. These experiments were performed for a range of stand-off distances <i>γ</i> (the ratio of the distance of the solid surface from the bubble to the bubble’s maximum radius) from 0.3 to 2.15. For all stand-off distances, single pits were the only surface change detected at the beginning of damage formation. Later phases of the collapse are not axisymmetric but show regions of “stronger” collapse, and the pits occur on the material underneath those regions. For <i>γ</i> &lt; 0.4, the damage is attributed to the second collapse. For <i>γ</i> &gt; 0.4, the first bubble collapse is most likely responsible for pitting. Shock-wave emission was detected from the collapse regions that were linked to the damage. On 316L, the pitting rate was found to be linearly dependent on the bubble radius, indicating a non-zero lower limit for the bubble radius below which pits do not occur. In terms of stand-off distance, the pitting rate (defined here as average pits per bubble) was non-monotonic, with maxima for bubbles initiated closest to the sample (<i>γ</i> = 0.3) and at <i>γ</i> = 1.4.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-024-01851-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140665901","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}

{"title":"Influence of Circumferential Extension on Friction of Small Intestine","authors":"Yi Huang,&nbsp;Liang Liang,&nbsp;Puhua Tang,&nbsp;Zhiming Guo,&nbsp;Yu Liu,&nbsp;Guanyu Hu","doi":"10.1007/s11249-024-01857-1","DOIUrl":"10.1007/s11249-024-01857-1","url":null,"abstract":"<div><p>In previous works, when studying the frictional behaviour of the small intestine, the small intestine was always in a natural state. However, when a capsule endoscope is travelling through the small intestine, since the diameter of the capsule endoscope may larger than the small intestine, the small intestine is then expanded in circumferential direction, which implies that previous works are not sufficient. This work uses flat–flat contact to simulate a capsule travelling through the small intestine, comparing the frictional behaviour of the small intestine in its natural and circumferentially expanding states, analysing the effects of other factors such as load, velocity and lubrication, which provides a realistic basis for the optimisation and control of magnetically controlled endoscopes.</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":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140674017","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}

{"title":"Influence of Particle Size on Friction and Wear Behavior of Hydrogenated Nitrile Rubber","authors":"Gang Hu,&nbsp;Jinshi Ou,&nbsp;Kai Tang,&nbsp;Honghui Luo,&nbsp;Guorong Wang","doi":"10.1007/s11249-024-01854-4","DOIUrl":"10.1007/s11249-024-01854-4","url":null,"abstract":"<div><p>Seal wear caused by hard particles intruding into the seal surface is one of the main causes of seal failure. In this manuscript, the tribological properties of hydrogenated nitrile rubber (HNBR) in the intrusion of five different sizes of garnet particles into the friction pair were studied through the pin-disk rubbing pair. The experimental results show that the particles change the contact pattern of the friction pairs, thus changing the amount of rubber wear. Different forms of particle motion contribute differently to the friction coefficient, and the particle sliding on the rubber surface contributes the most. As the particle size decreases, the friction coefficient tends to increase and then decrease, which can be explained by energy dissipation theory.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140678140","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}

{"title":"A Numerical Simulation of PFPE Lubricant Kinetics in HAMR Air Bearing","authors":"Roshan Mathew Tom,&nbsp;Qilong Cheng,&nbsp;David B. Bogy","doi":"10.1007/s11249-024-01853-5","DOIUrl":"10.1007/s11249-024-01853-5","url":null,"abstract":"<div><p>This report investigates the kinetics of lubricant molecules in the HAMR air bearing to understand the initiation and growth of PFPE contamination on the head surface. The collisions with the air bearing induce three forces—drag, thermophoresis, and lift. Of these, we find that lift forces are negligible. Then, a sensitivity analysis of the remaining two forces reveals the conditions where they dominate. Further, a hybrid simulation strategy is utilized to track their movements. The results show that the contaminations (smear) highly depend on the interplay between the thermophoresis and drag forces. We then explain the mechanism of the formation of the various observed patterns. Finally, we offer some recommendations to exploit the air bearing to contain smear on the head.</p></div>","PeriodicalId":806,"journal":{"name":"Tribology Letters","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11249-024-01853-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140614037","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}