Journal of Tribology-transactions of The Asme最新文献_第9页

Dry sliding wear performances of AA5052 hybrid composite brake disc materials reinforced with in-situ synthesized TiC and multi-walled CNT 原位合成TiC和多壁碳纳米管增强AA5052复合制动盘材料的干滑动磨损性能

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-04-11 DOI: 10.1115/1.4062296

P. Samal, P. Vundavilli

{"title":"Dry sliding wear performances of AA5052 hybrid composite brake disc materials reinforced with in-situ synthesized TiC and multi-walled CNT","authors":"P. Samal, P. Vundavilli","doi":"10.1115/1.4062296","DOIUrl":"https://doi.org/10.1115/1.4062296","url":null,"abstract":"\u0000 In this research, aluminum alloy AA5052 based hybrid metal matrix composites (MMCs) were fabricated using in-situ synthesized titanium carbide (TiC) and ex-situ multi-walled carbon nanotube (MWCNT) as reinforcements using the liquid metallurgy route. The wear characteristics of the aluminum hybrid MMCs were analyzed under the synergistic effects of TiC and multi-walled CNT. Pin-on-disc wear apparatus was utilized for the experimental investigation where the hybrid composite is considered as the disc, and the traditional brake pad material is treated as the pin. The parameters i.e. applied load, sliding velocity, sliding distance, and reinforcement content are treated as inputs, whereas the wear rate and coefficient of friction are considered as output variables for the tribological experimentation. The influence of various input process parameters on the tribological behavior of the fabricated samples was investigated. The plastic deformation attained by the base alloy exhibited the delamination, which indicates the adhesive wear, whereas the composites exhibited abrasive nature as analyzed from the wear surface morphology. The wear debris was characterized by flake-sized, corrugated, and oxidized by the microstructural study.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46626118","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: 1

Electrical Contact During a Rolling Vibratory Motion Considering Mixed Lubrication 考虑混合润滑的滚动振动过程中的电接触

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-04-11 DOI: 10.1115/1.4062295

{"title":"Electrical Contact During a Rolling Vibratory Motion Considering Mixed Lubrication","authors":"","doi":"10.1115/1.4062295","DOIUrl":"https://doi.org/10.1115/1.4062295","url":null,"abstract":"\u0000 In many devices and applications, electrical contacts are exposed to vibrations, sliding, or rolling conditions and are prone to the fretting-based degradation. Thus, lubricants are often employed in such contacts to reduce sliding wear and fretting corrosion. However, due to the non-conductive behavior of the lubricants with fluorocarbons and hydrocarbons, lubricants lead to a few adverse problems. Also, the fluid dynamics upon excitation, vibration or sliding causes extended breaks or gaps in between the conducting surfaces. In reality, this can be noticed during vibrations occurring as a result of earthquakes or technical personnel maintenance. This could also have applications to electrified rolling element bearings. Factors such as surface roughness and fluid viscosity will determine the time taken for the two surfaces of the connectors to separate from a solid conductive contact. In this work, a coupled structural-fluid theoretical model is developed for evaluating such intermittent contact breaks/gaps when two metallic rough surfaces in contact are under vibrations. The model is capable of predicting the increase in the fluid film as well as the contact resistance change with time due to the possible connector vibration. The experimentally observed rocking vibration mode seen in connectors and the time-dependent squeeze film lubrication effect are also considered.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49030025","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: 1

Multi-objective optimization of three-stage running-in process for main bearing of marine diesel engine 船用柴油机主轴承三段式磨合过程多目标优化

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-04-11 DOI: 10.1115/1.4062298

引用次数: 1

Positron Annihilation and EBSD Studies of Subsurface Zone Created during Friction in Vanadium 钒摩擦产生的地下带的正电子湮灭和EBSD研究

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-04-11 DOI: 10.1115/1.4062297

J. Dryzek, M. Wróbel

引用次数: 0

Numerical Investigation of Turbopump Bearing Heat Generation in Liquid Methane 液化气中涡轮泵轴承产热的数值研究

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-04-11 DOI: 10.1115/1.4062294

Hiromitsu Kakudo, S. Takada, T. Hirayama

{"title":"Numerical Investigation of Turbopump Bearing Heat Generation in Liquid Methane","authors":"Hiromitsu Kakudo, S. Takada, T. Hirayama","doi":"10.1115/1.4062294","DOIUrl":"https://doi.org/10.1115/1.4062294","url":null,"abstract":"\u0000 Liquid methane is one of the most promising candidates for the next-generation rocket propellant because it has an excellent balance between several propulsion performances such as specific impulse, storability, and structural coefficient. JAXA has developed rocket engine technologies for liquid methane engines. In this paper, we investigate heat generation characteristics of ball bearings used in liquid methane turbopumps. A usual approach to evaluate a cryogenic ball bearing performance is to conduct experimental testing which costs a lot. This research introduces numerical approaches based on physical mechanisms in rotating ball bearings to clarify the heat generation characteristics. The main factors of the heat generation are friction heat generation and fluid heat generation. The friction heat generation is caused by mechanical friction of bearing elements and calculated based on bearing motion analysis and Hertzian contact theory. The fluid heat generation is caused by the fluid drag force on bearing elements and calculated by CFD analysis. The theoretical model is compared with experimental results, showing an excellent agreement. It is clarified that the dominant factor of the bearing heat generation in liquid methane environment is the friction heat generation on races-balls contact at lower velocity condition while it tends to change to the fluid heat generation due to the bearing elements' rotational motion at higher velocity condition. In addition, cryogenic bearing characteristics which are clarified by theoretical modeling are discussed.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42634865","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

Experimental Study on the Effect of Off-Sized Rollers on the Dynamic Load Distribution in a Cylindrical Roller Bearing 偏心滚子对圆柱滚子轴承动态载荷分布影响的实验研究

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-03-30 DOI: 10.1115/1.4062251

Yu Hou, Xi Wang, Xingyu Li, Rubing Guo, Junqiang Li, Qiang Li

{"title":"Experimental Study on the Effect of Off-Sized Rollers on the Dynamic Load Distribution in a Cylindrical Roller Bearing","authors":"Yu Hou, Xi Wang, Xingyu Li, Rubing Guo, Junqiang Li, Qiang Li","doi":"10.1115/1.4062251","DOIUrl":"https://doi.org/10.1115/1.4062251","url":null,"abstract":"\u0000 The differences in the roller diameters within a roller bearing is unavoidable in practice, which is known as the off-sized effect. The off-sized effect results in the dynamic variation of the load distribution in bearings and further the abnormal vibration and premature failure of bearings. This paper experimentally investigates the effect of off-sized rollers on the dynamic load distribution in a cylindrical roller bearing. Different configurations of off-sized rollers are given considering the oversized and undersized roller conditions, and the number and position of off-sized rollers. The real-time roller-raceway contact loads distributed in the bearing are measured under these test cases. The results show that a single off-sized roller leads to the loading change directly on itself and further the load rebalances among the adjacent rollers. Under the conditions of multiple off-sized rollers, a stack effect of the competition rule of roller loading dominates the variation range of the dynamic load distribution. As results of the stack effect, among all roller configurations, the configuration of multiple off-sized rollers adjacent to each other leads to the minimum range of the dynamic load distribution, while the configuration of two off-sized rollers separated by a regular roller leads to the maximum one.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49093254","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: 1

Developing elastic-plastic material models for pressure measurement films in a steel-steel contact for smooth and rough surfaces 建立了用于光滑和粗糙表面的钢-钢接触压力测量膜的弹塑性材料模型

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-03-08 DOI: 10.1115/1.4062101

Ina Stratmann, J. Goersch, Moritz Neuser, C. Schindler, Tanja Stratmann

{"title":"Developing elastic-plastic material models for pressure measurement films in a steel-steel contact for smooth and rough surfaces","authors":"Ina Stratmann, J. Goersch, Moritz Neuser, C. Schindler, Tanja Stratmann","doi":"10.1115/1.4062101","DOIUrl":"https://doi.org/10.1115/1.4062101","url":null,"abstract":"\u0000 The contact zone between two steel components can be identified by utilizing a pressure measurement film in the contact between them. To reduce the number of necessary experiments, it is possible to simulate the contact situation using ‘finite element analysis’. This analysis requires material models for the contact partners and for the pressure measurement films. It is known that the pressure measurement film deforms not only elastically but also plastically. Taking this plastic deformation into account requires an appropriate material model such as the Drucker-Prager model. Based on published data of experiments with pressure measurement films that had been inserted between smooth and rough Hertzian bodies, we developed material models for three pressure measurement films. The roughness of a Hertzian body was studied by determining multiple pressure-clearance curves for three different surface roughnesses and for three different pressure measurement films. These curves were developed with micro models, which represented a small section of the rough contact surface. An average curve for each material was then implemented in the macro model for each roughness representing the contact situation. Subsequently, the resulting contact areas were compared with the published experimental data. This comparison showed that the material model for the smooth contact was able to emulate the experimentally determined contact areas. Including the pressure-clearance curves in the material model allowed the simulation of the rough contact situation. However, the deviation between the simulated and the experimental data was slightly larger for the rough surface than for the smooth surface.","PeriodicalId":17586,"journal":{"name":"Journal of Tribology-transactions of The Asme","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42316260","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

On the uniqueness of wear coefficient for abrasive wear at nanoscale 纳米级磨料磨损磨损系数的唯一性

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-03-08 DOI: 10.1115/1.4062099

Li Ma, R. Aghababaei

引用次数: 1

Tribological Performance of Laser Shock Peened Cold Spray Additive Manufactured 316L Stainless Steel 316L不锈钢激光冲击喷丸冷喷添加剂的摩擦学性能

IF 2.5 3区工程技术

Journal of Tribology-transactions of The Asme Pub Date : 2023-03-08 DOI: 10.1115/1.4062102

A. Ralls, B. Mao, P. Menezes

引用次数: 4

Elevated Temperature Wear Behaviour of AZ91 Magnesium Alloy after Micro-Arc Oxidation in Single and Dual Phase Electrolytes AZ91镁合金在单相和两相电解液中微弧氧化后的高温磨损行为