Journal of Tribology-transactions of The Asme最新文献_第4页

Tribo-dynamic performance of newly developed environmentally friendly lubricating greases containing nano-CaCO3 新开发的含纳米碳酸钙的环保型润滑脂的摩擦动力学性能

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-08-09 DOI: 10.1115/1.4063138

Ankit Saxena, D. Kumar, Naresh Tandon

{"title":"Tribo-dynamic performance of newly developed environmentally friendly lubricating greases containing nano-CaCO3","authors":"Ankit Saxena, D. Kumar, Naresh Tandon","doi":"10.1115/1.4063138","DOIUrl":"https://doi.org/10.1115/1.4063138","url":null,"abstract":"\u0000 The present study explores the performance of novel vegetable oil-based greases containing nano-CaCO3 as an additive. A series of greases with varying nanoparticle concentrations (0 – 4 %w/w) are evaluated on a four-ball tester machine under a standard tribological test (ASTM D2266) and simultaneously in a rolling bearing at various speeds and loads against two commercial greases as the benchmark. The vibrations and shock pulse measurements (SPM) are recorded to assess the bearing performance. The tribo-dynamic investigation suggests that the eco-friendly nano-greases are at par with the commercial ones; the performance varies with the nanoparticle concentration. Under the tribological test, the third-body action of nanoparticles seems to increase friction, while the interfacial deposition (physisorption) of nano-CaCO3 and nano-CaO decreases wear. Under the bearing test, the rolling effect of nanoparticles seems to influence the vibrations, while their entrainment in the contact zone governs the carpet values. The nano-grease containing 4% nano-CaCO3 performs best under both assessments, displaying great prospects of a sustainable and potential alternative to existing environmentally unfriendly greases.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41944678","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

Influence of PTFE-based dry lubricants on friction and wear behavior in dry lubricated steel-bronze contact ptfe基干润滑剂对干润滑钢-青铜接触摩擦磨损性能的影响

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-08-04 DOI: 10.1115/1.4063116

Lionel Simo Kamga, S. Emrich, R. Merz, M. Oehler, MichaelaGedan-smolka Gedan-Smolka, M. Kopnarski, B. Sauer, O. Koch

{"title":"Influence of PTFE-based dry lubricants on friction and wear behavior in dry lubricated steel-bronze contact","authors":"Lionel Simo Kamga, S. Emrich, R. Merz, M. Oehler, MichaelaGedan-smolka Gedan-Smolka, M. Kopnarski, B. Sauer, O. Koch","doi":"10.1115/1.4063116","DOIUrl":"https://doi.org/10.1115/1.4063116","url":null,"abstract":"\u0000 In this paper, solid lubricants are investigated to examine their tribological performance in a dry lubricated steel-bronze contact. The examined solid lubricants are made of polyamide (PA) and irradiated polytetrafluoroethylene (PTFE), which are chemically bonded by reactive melt extrusion. For the tribological investigations, a block-twin-disc test rig on the one hand and a three-disc test rig on the other hand were used under ambient conditions, where the solid lubricant for lubricating the steel-bronze contact was released from a block or a disc. Results from the tribological investigations are presented here, showing the friction and wear behavior in a steel-bronze contact depending on the slide-to-roll ratio in the contact between the steel disc and the compound body. Furthermore, surface analytical investigations on the steel and bronze discs were carried out. These studies showed that the chemical bonding of 20 wt-% of irradiated PTFE in PA12 improves the wear and friction behavior in steel-bronze contact significantly, due to the build-up of a transfer film of PTFE on the steel surface.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48279193","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

Microstructure characteristics and tribological properties of gradient Cu-MoS2 self-lubricating coating fabricated by selective laser melting of ink-printed metal nanoparticles 油墨印刷金属纳米颗粒选择性激光熔化制备梯度Cu-MoS2自润滑涂层的微观结构特征和摩擦学性能

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-08-02 DOI: 10.1115/1.4063083

Wenfeng Guo, Ronghe Bai, Tianyu Guan, Yu He, Junyan Liu

{"title":"Microstructure characteristics and tribological properties of gradient Cu-MoS2 self-lubricating coating fabricated by selective laser melting of ink-printed metal nanoparticles","authors":"Wenfeng Guo, Ronghe Bai, Tianyu Guan, Yu He, Junyan Liu","doi":"10.1115/1.4063083","DOIUrl":"https://doi.org/10.1115/1.4063083","url":null,"abstract":"\u0000 Self-lubricating coating has been used in industrial applications with severe conditions, such as high temperatures, vacuum, radiation, etc. In this paper, a selective laser melting based ink-printed metal nanoparticles (SLM-IP metal NPs) rapid manufacturing method was applied to fabricate Cu-MoS2 self-lubricating coating. A tailored ink consisting metal NPs, reductant and dispersant was deposited on a stainless steel substrate, forming the laminated gradient Cu-MoS2 coating. The microstructure and mechanical properties of the composite coating were characterized. The friction and wear behavior were experimentally investigated by dry sliding wear test at room and higher temperature (>200°C). The results indicated that the upper copper sulfur molybdenum compounds layer with homogeneously distributed MoS2 provided a significant friction reduction and wear resistance. The SLM-IP Cu-MoS2 coatings showed reduced friction coefficient by 54% compare to the pure Cu coating. The transitional Cu layer mitigated the abrupt changes in physical properties and enhanced the bonding strength between the coating and substrate. Especially, under the test condition of 200°C, the Cu-40 vol% MoS2 coating also presented an excellent resistance to oxidation and had a lower friction coefficient of 0.24. This research provided a feasibility of fabricating self-lubricating coatings by the SLM-IP metal NPs method for surface engineering technologies.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45296182","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

A Stress-State Dependent Sliding Wear Model for Micro-Scale Contacts 微尺度接触的应力状态相关滑动磨损模型

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-08-02 DOI: 10.1115/1.4063082

Jamal Choudhry, A. Almqvist, B. Prakash, R. Larsson

{"title":"A Stress-State Dependent Sliding Wear Model for Micro-Scale Contacts","authors":"Jamal Choudhry, A. Almqvist, B. Prakash, R. Larsson","doi":"10.1115/1.4063082","DOIUrl":"https://doi.org/10.1115/1.4063082","url":null,"abstract":"\u0000 Wear is a complex phenomenon taking place as two bodies in relative motion are brought into contact with each other. There are many different types of wear, e.g., sliding, fretting, surface fatigue, and combinations thereof. Wear occurs over a wide range of scales, and it largely depends on the mechanical properties of the material. For instance, at the micro-scale, sliding wear is the result of material detachment that occurs due to fracture. An accurate numerical simulation of sliding wear requires a robust and efficient solver, based on a realistic fracture mechanics model that can handle large deformations. In the present work, a fully coupled thermo-mechanical and meshfree approach, based on the Momentum-Consistent Smoothed Particle Galerkin method (MC-SPG), is adapted and employed to predict wear of colliding asperities. The MC-SPG based approach is used to study how the plastic deformation, thermal response, and wear are influenced by the variation of the interference between colliding spherical asperities. The results indicate a critical interference at which there is a transition of wear from plastic deformation to brittle fracture. The results also indicate that the average temperature changes linearly with increasing interference values up to the critical interference, after which it reaches a steady-state value.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46071503","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

Semi-analytical model for 3D multilayered rolling contact problems with different creepage combinations 不同爬电组合的三维多层滚动接触问题半解析模型

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-07-28 DOI: 10.1115/1.4063063

Yinhu Xi, Bo Li, A. Almqvist

{"title":"Semi-analytical model for 3D multilayered rolling contact problems with different creepage combinations","authors":"Yinhu Xi, Bo Li, A. Almqvist","doi":"10.1115/1.4063063","DOIUrl":"https://doi.org/10.1115/1.4063063","url":null,"abstract":"\u0000 In this work, a semi-analytical model replicating 3D rolling contact problems with elastic coating layers has been proposed. The dimension reduced boundary element based model rests on the conventional half-space assumptions, with influence coefficients describing the relationship between the stress and the displacement. In this model, the influence coefficient describes the stress-strain relationship for multilayered materials, which is derived from the corresponding frequency-response functions. The governing equations for 3D rolling contact problems are solved efficiently by using the conjugate gradient method with the classical FFT-based technique to accelerate the calculation of the integral equation relating the stresses to the strains, and all the possible creepages, i.e., the longitudinal, lateral and spin creepages are considered. The results obtained with the present numerical model are compared with existing results, and good agreement is found. Some selected results are presented to show the effect of the material elasticity and the thickness of the coating, and the layering, on the traction distribution and the traction coefficient under different creepage combinations. In this way, this work provides important information related to the composition of layered coatings in rolling contact applications.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46349269","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

Static characteristics of high-speed water-lubricated journal bearing considering turbulence and cavitation effects 考虑湍流和空化效应的高速水润滑轴颈轴承静态特性

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-07-25 DOI: 10.1115/1.4063025

H. Zhang, Xiaohui Lin, Shuyun Jiang

引用次数: 0

A model of hydrodynamic bearings with circumferential parallel arranged grooves 具有周向平行布置槽的流体动力轴承模型

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-07-25 DOI: 10.1115/1.4063026

Yan Li, Yanqiang Ning, Desheng Zhang, Yinhe Zhi

{"title":"A model of hydrodynamic bearings with circumferential parallel arranged grooves","authors":"Yan Li, Yanqiang Ning, Desheng Zhang, Yinhe Zhi","doi":"10.1115/1.4063026","DOIUrl":"https://doi.org/10.1115/1.4063026","url":null,"abstract":"\u0000 A model is proposed to describe and analyze hydrodynamic bearings with circumferential parallel arranged grooves along any arbitrary groove curve. The Reynolds equation is solved with finite volume method, and the additional terms of the discretized equation for any arbitrary groove curve are deducted. With the model, any groove curve could be characterized by setting an array of inclination angles, and dash-shape grooves can also be modelled by setting the matrix of flag variables reflecting whether it is in the groove. Based on the model, the transient behaviors of four groove types are analyzed by Runge-Kutta method, with the pressure distribution, rotor's center orbit and leakage flow obtained. An experiment is conducted to validate the model. Results show that the dash-shape grooves, which are asymmetrical herringboned and intermittent, have both advantages of stability and sealing. The experimental and numerical results of pressure and leakage flow show good agreement in general. The model proposed in this paper will facilitate the design of grooved hydrodynamic bearings, as different groove types can be analyzed and compared by the same model.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43731752","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

Static Characteristics of Water-lubricated Hydrodynamic Spiral-groove Journal and Thrust Bearings for Motorized Spindle 电主轴水润滑动液螺旋槽推力轴承静态特性研究

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-07-25 DOI: 10.1115/1.4063024

Xun Huang, Ge Xu, Shuyun Jiang

引用次数: 0

The Effect of Spherical Hybrid Silica-Molybdenum Disulphide on the Lubricating Characteristics of Castor Oil 二氧化硅-二硫化钼球形杂化物对蓖麻油润滑特性的影响

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-07-19 DOI: 10.1115/1.4062996

Gulshan Verma, H. A. P., O. P. Khatri

引用次数: 1

A theoretical contact model for rough elastic spheres 粗糙弹性球的理论接触模型

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-07-11 DOI: 10.1115/1.4062933

Shiwen Chen, W. Yuan, X. Liang, G. Wang

引用次数: 0