Journal of Tribology最新文献_第2页

In-vitro wear of Titanium reinforced Hydroxyapatite coatings in simulated body fluid 钛增强型羟基磷灰石涂层在模拟体液中的体外磨损

Journal of Tribology Pub Date : 2024-07-16 DOI: 10.1115/1.4065983

Srikant Tiwari, Suryanarayan Mishra

引用次数: 0

Effect of variable load on centralized dimple in opposite sliding condition 反向滑动条件下可变载荷对集中凹陷的影响

Journal of Tribology Pub Date : 2024-07-02 DOI: 10.1115/1.4065871

Hengrui Du, Jing Wang, Xinqing Wang

{"title":"Effect of variable load on centralized dimple in opposite sliding condition","authors":"Hengrui Du, Jing Wang, Xinqing Wang","doi":"10.1115/1.4065871","DOIUrl":"https://doi.org/10.1115/1.4065871","url":null,"abstract":"\u0000 In ball bearings without a cage, adjacent balls exhibit a zero-entrainment velocity (ZEV) contact condition, which is worse than typical pure rolling or rolling-sliding contact, and the contact between adjacent balls under periodic loading is notably more complicated. In this work, thermal elastohydrodynamic lubrication (EHL) numerical calculation is carried out under the condition of periodic impact and opposite sliding line contact over a wide range of surface speeds. the pressure is solved by multigrid method, the elastic deformation is evaluated using multigrid integration method, the temperature field is calculated by column-by-column scanning technique. The results show that the loading-unloading process exerts significant influence on the variation of the centralized dimple, pressure, and temperature rises as well as the oil characteristics. With the increase of surface speed, the effect of load fluctuations diminishes, and the central dimple exhibits the following evolutionary trend under ZEV conditions: no dimple at very low velocity - small central dimple - large typical dimple - no dimple at high velocity. The result indicates that under the ZEV condition of EHL stage, elevated velocities decrease the coefficient of friction and augment the film thickness.","PeriodicalId":509807,"journal":{"name":"Journal of Tribology","volume":"70 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141688395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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 Thermal Conductivity on Maximum Film Pressure in Point EHL Contact of Ceramics with Transverse Surface Roughness 导热性对具有横向表面粗糙度的陶瓷点 EHL 接触最大膜压的影响

Journal of Tribology Pub Date : 2024-07-02 DOI: 10.1115/1.4065877

M. Kaneta

引用次数: 0

Numerical Calculation of the Oil Flow in a Truck Rear Axle Transmission and the Influence of Gear-Induced Air Flow 卡车后桥变速箱中油流的数值计算及齿轮诱导气流的影响

Journal of Tribology Pub Date : 2024-07-02 DOI: 10.1115/1.4065872

L. Hildebrand, Philipp Beierer, T. Lohner, Karsten Stahl

{"title":"Numerical Calculation of the Oil Flow in a Truck Rear Axle Transmission and the Influence of Gear-Induced Air Flow","authors":"L. Hildebrand, Philipp Beierer, T. Lohner, Karsten Stahl","doi":"10.1115/1.4065872","DOIUrl":"https://doi.org/10.1115/1.4065872","url":null,"abstract":"\u0000 For the reliable operation of a gearbox, consistently sufficient lubrication of tooth contacts and bearings is necessary. Thus, gearbox oil flow plays an important role. Additionally, air flow may affect the oil flow in the gearbox. The state of the art indicates that Computational Fluid Dynamics (CFD) enables targeted support of the gearbox development process at an early stage. Computational time plays a prominent role in practical applications due to associated costs. The particle-based Smoothed Particle Hydrodynamics (SPH) shows great potential for time-efficient calculations, especially with a simplified single-phase modeling approach. This study examines the influence of gear-induced air flow on gearbox oil flow, focusing on a test gearbox to identify a suitable modeling approach for a truck rear axle transmission. The results indicate that for the investigated operating conditions, the gear-induced air flow only impacts gearbox oil flow at higher circumferential speeds. For lower circumferential speeds, a single-phase SPH yields good results with significantly reduced computation times compared to the two-phase SPH. Applying the single-phase SPH to the truck rear axle transmission and comparing numerical results with experimental findings demonstrates a reliable representation of the oil flow characteristics.","PeriodicalId":509807,"journal":{"name":"Journal of Tribology","volume":"95 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141687281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the impact of HFO-1234YF refrigerant on the tribological properties of advanced polymeric coatings 探索 HFO-1234YF 制冷剂对先进聚合物涂层摩擦学特性的影响

Journal of Tribology Pub Date : 2024-07-02 DOI: 10.1115/1.4065870

Ajinkya Raut, A. Amiri, Andreas A. Polycarpou

{"title":"Exploring the impact of HFO-1234YF refrigerant on the tribological properties of advanced polymeric coatings","authors":"Ajinkya Raut, A. Amiri, Andreas A. Polycarpou","doi":"10.1115/1.4065870","DOIUrl":"https://doi.org/10.1115/1.4065870","url":null,"abstract":"\u0000 The global focus has shifted towards mitigating the impact of global warming, particularly in the air-conditioning and refrigeration sectors where there is a strong emphasis on the use of environmentally friendly refrigerants. One such refrigerant that has gained increased usage is HFO-1234yf. The increasing use of HFO-1234yf as a refrigerant in automobile air conditioning compressors presents new challenges in terms of material compatibility. In this research, we investigate the impact of HFO-1234yf in automobile compressor applications by comparing the tribological results of the same materials in air. We conducted tribological experiments under starved lubrication conditions using Polyetheretherketone (PEEK)/ Polytetrafluoroethylene (PTFE) and Aromatic thermosetting co-polyesters (ATSP) /PTFE-coated aluminum alloy samples. We found that the ATSP/PTFE coatings perform exceptionally well irrespective of the atmosphere, and the presence of HFO-1234yf refrigerant adversely affects the tribological performance of the PEEK/PTFE coatings citing the lack of a stable tribofilm formation. These findings offer valuable insights for the development of materials and lubricants that are compatible with HFO-1234yf refrigerant applications.","PeriodicalId":509807,"journal":{"name":"Journal of Tribology","volume":"48 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141687825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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 Wear Behavior Between Crossed Parabolic Cylinders in the Early Stage of Cyclic Fretting 循环烧蚀早期交叉抛物面圆柱体间磨损行为研究

Journal of Tribology Pub Date : 2024-06-11 DOI: 10.1115/1.4065711

Hao Shi, Tieneng Guo, Chenhang Wang, Bo Li, Nan Jiang, Jianshuo Zhang

{"title":"Research on Wear Behavior Between Crossed Parabolic Cylinders in the Early Stage of Cyclic Fretting","authors":"Hao Shi, Tieneng Guo, Chenhang Wang, Bo Li, Nan Jiang, Jianshuo Zhang","doi":"10.1115/1.4065711","DOIUrl":"https://doi.org/10.1115/1.4065711","url":null,"abstract":"\u0000 In practice, even the tiny relative reciprocating motion generated by external load or environmental vibration can cause interface wear. In this work, three-dimensional (3D) finite element analysis (FEA) is used to investigate the fretting wear between deformable crossed parabolic cylinders. Fretting is achieved by the application of a periodic displacement-controlled load, while the contact pair is defined as the same material, i.e., Carbon Steel/Carbon Steel, Copper Alloy/Copper Alloy, and Aluminum Alloy/Aluminum Alloy. Meanwhile, three different axis crossing angles are also studied, i.e., 45°, 60°, and 90°. Originally, a wide range of coefficients of friction (COFs) are applied to the interface without considering the damage. The results show that, when the COF is sufficiently large (µ = 1), the junction growth and the tangential load increase significantly in the first loading cycle, but then become gradually stable. Subsequently, the Archard wear model is applied to the frictional interface. Empirical equations for the initial gross slip distance and the wear volume at the end of the partial slip are established in turn. Furthermore, an empirical equation for the wear volume of a single fretting cycle is established, which is in good agreement with the FEA results. Lastly, the effect of relevant parameters on the wear volume for a single fretting cycle under elastic condition is discussed, but also the evolution of wear volume in the early stage of cyclic fretting. All the results are normalized, enabling their application to the 3D fretting wear of other material pairs.","PeriodicalId":509807,"journal":{"name":"Journal of Tribology","volume":"15 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141356807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Friction Variability in Slip Rings: Geometry and Stiffness Effects 滑环的摩擦变化：几何形状和刚度的影响

Journal of Tribology Pub Date : 2024-06-11 DOI: 10.1115/1.4065712

Kaisen Zhang, Kun Liu, Danfeng Sun, Tianyan Gao, Jiaxin Ye

引用次数: 0

Ultrasound-assisted synthesis of novel undecylenic estolides: Modeling and Tribological characterization 超声波辅助合成新型十一烯雌酚：建模和摩擦学表征

Journal of Tribology Pub Date : 2024-06-05 DOI: 10.1115/1.4065688

Prasad Sanap, Rohan Thakur, Amit Pratap

{"title":"Ultrasound-assisted synthesis of novel undecylenic estolides: Modeling and Tribological characterization","authors":"Prasad Sanap, Rohan Thakur, Amit Pratap","doi":"10.1115/1.4065688","DOIUrl":"https://doi.org/10.1115/1.4065688","url":null,"abstract":"\u0000 To overcome the issues related to low-temperature characteristics and thermal degradation of fatty acid based lubricant base stocks, chemical modification is essential. To mitigate these shortcomings, considering unsaturated undecylenic acid, the formation of estolides is one of the best transformations considering application in lubricants. Ultrasonic-assisted sulfuric acid-catalyzed synthesis of estolides of undecylenic was modeled using response surface methodology (RSM) and subsequently validated using artificial neural network (ANN) for known and unknown input variables. At optimal reaction conditions of reaction temperature of 56°C, catalyst loading of 0.63 mole-equivalent, and reaction time of 1.61 hours, estolides with estolide number (EN) of 2.58, extraordinary low pour point (PP) of −52°C and better resistance to thermal degradation was obtained. The thermal degradation was evaluated using thermogravimetric analysis (TGA) to find improved resistance toward degradation due to the formation of estolides. Further, tribological properties like wear characteristics, load carrying capacity, and oxidative stability were studied for 5% blends in SN 70 base oil. The anti-wear ability of the estolides was found to be superior to undecylenic acid, with a lower coefficient of friction, scar diameter, depth, and volume. The blend containing estolide was found to have load carrying capacity as high as 800 kgf. Moreover, owing to the double bond migration during the reaction, the oxidative stability of estolides was found to be inferior to the terminally unsaturated undecylenic acid.","PeriodicalId":509807,"journal":{"name":"Journal of Tribology","volume":"44 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141385882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid Failure of Lubricated Contacts with Grease Under ZEV Condition ZEV 条件下使用润滑脂润滑的触点快速失效

Journal of Tribology Pub Date : 2024-06-05 DOI: 10.1115/1.4065689

Hengrui Du, Weidong Xie, Jing Wang, C. Venner

引用次数: 0

A Review of Computational Fluid Dynamics Approaches Used to Investigate Lubrication of Rolling Element Bearings 用于研究滚动体轴承润滑的计算流体力学方法综述

Journal of Tribology Pub Date : 2024-06-04 DOI: 10.1115/1.4065663

F. Sadeghi, Ujjawal Arya, Saeed Aamer, Andreas Meinel

引用次数: 0