Advances in Tribology最新文献_第8页

Effect of Surface Roughness and Viscosity-Pressure Dependency on the Couple Stress Squeeze Film Characteristics of Parallel Circular Plates 表面粗糙度和粘压关系对平行圆板耦合应力挤压膜特性的影响

IF 2.6

Advances in Tribology Pub Date : 2014-05-25 DOI: 10.1155/2014/387413

N. Naduvinamani, S. Apparao, Ayyappa G. Hiremath

{"title":"Effect of Surface Roughness and Viscosity-Pressure Dependency on the Couple Stress Squeeze Film Characteristics of Parallel Circular Plates","authors":"N. Naduvinamani, S. Apparao, Ayyappa G. Hiremath","doi":"10.1155/2014/387413","DOIUrl":"https://doi.org/10.1155/2014/387413","url":null,"abstract":"Combined effects of surface roughness and viscosity-pressure dependency on the couple stress squeeze film characteristics of parallel circular plates are presented. On the basis of Christensen’s stochastic theory, two types of one-dimensional roughness structures, namely, the radial roughness and azimuthal roughness patterns, are considered and the stochastic modified Reynolds equation for these two types of roughness patterns is derived for Stokes couple stress fluid by taking into account variation of viscosity with pressure. The standard perturbation technique is employed to solve the averaged Reynolds equation and closed form expressions for the mean fluid film pressure, load carrying capacity, and squeeze film time are obtained. It is found that the effects of couple stresses and viscosity-pressure dependency are to increase the load carrying capacity, and squeeze film time for both types of roughness patterns. The effect of azimuthal (radial) roughness pattern is to increase (decrease) these squeeze film characteristics as compared to the corresponding smooth case.","PeriodicalId":44668,"journal":{"name":"Advances in Tribology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/387413","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64473939","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: 13

Studies on Erosion Behavior of Plasma Sprayed Coatings of Glass Microspheres Premixed with Al2O3 Particles Al2O3预混合玻璃微球等离子喷涂涂层的腐蚀行为研究

IF 2.6

Advances in Tribology Pub Date : 2014-03-31 DOI: 10.1155/2014/763601

G. Gupta, A. Satapathy

{"title":"Studies on Erosion Behavior of Plasma Sprayed Coatings of Glass Microspheres Premixed with Al2O3 Particles","authors":"G. Gupta, A. Satapathy","doi":"10.1155/2014/763601","DOIUrl":"https://doi.org/10.1155/2014/763601","url":null,"abstract":"Solid particle erosion (SPE) tests are carried out to evaluate the performance of plasma sprayed coatings of borosilicate glass microspheres (BGM) premixed with Al2O3 particles on metallic substrates. For this purpose, an Air Jet Erosion test rig confirming to ASTM G 76 test standards is used. Relative influence of different operating parameters on erosion rate is assessed by statistical analysis of the experimental findings that are based on Taguchi’s L16 orthogonal array. This analysis helps to identify the most significant factor affecting the erosion wear rate of the coating. The study reveals that the impact velocity, impingement angle, erodent size, and Al2O3 content in the feed stock, in the declining sequence, are the significant factors influencing the wear rate of these coatings. An Artificial Neural Network (ANN) approach is then implemented taking into account training and test procedure to predict the triboperformance of these coatings under wear conditions beyond the experimental range. Further, the microstructural features of the eroded samples are studied from SEM images to identify possible wear mechanisms.","PeriodicalId":44668,"journal":{"name":"Advances in Tribology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2014-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/763601","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64661565","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: 10

Characterization and Empirical Modelling of Sliding Wear on Sintered Aluminium-Graphite Composites 烧结铝-石墨复合材料滑动磨损表征及经验模型

IF 2.6

Advances in Tribology Pub Date : 2014-03-30 DOI: 10.1155/2014/273738

Amrishraj Doraisamy, S. Thiagarajan

引用次数: 5

Analysis of Tribological Behavior of Carbon Nanotube Based Industrial Mineral Gear Oil 250 cSt Viscosity 黏度为250 cSt的碳纳米管基工业矿物齿轮油摩擦学行为分析

IF 2.6

Advances in Tribology Pub Date : 2014-03-13 DOI: 10.1155/2014/341365

S. Bhaumik, S. Prabhu, Kingsly Jeba Singh

引用次数: 37

Solid Particle Erosion of Date Palm Leaf Fiber Reinforced Polyvinyl Alcohol Composites 枣椰叶纤维增强聚乙烯醇复合材料的固体颗粒侵蚀性能

IF 2.6

Advances in Tribology Pub Date : 2014-01-22 DOI: 10.1155/2014/293953

J. Mohanty, S. N. Das, H. Das, T. K. Mahanta, S. B. Ghadei

引用次数: 17

Effect of Nanoadditives with Surfactant on the Surface Characteristics of Electroless Nickel Coating on Magnesium-Based Composites Reinforced with MWCNT 表面活性剂纳米添加剂对MWCNT增强镁基复合材料化学镀镍表面特性的影响

IF 2.6

Advances in Tribology Pub Date : 2013-12-29 DOI: 10.1155/2013/315965

R. Dhinakaran, R. Elansezhian, Arunachalam Arumugam Lalitha

{"title":"Effect of Nanoadditives with Surfactant on the Surface Characteristics of Electroless Nickel Coating on Magnesium-Based Composites Reinforced with MWCNT","authors":"R. Dhinakaran, R. Elansezhian, Arunachalam Arumugam Lalitha","doi":"10.1155/2013/315965","DOIUrl":"https://doi.org/10.1155/2013/315965","url":null,"abstract":"An experimental investigation has been carried out on optimizing process parameters of electroless nickel-phosphorous coatings on magnesium composite reinforced with carbon nanotube. A comprehensive experimental study of electroless Ni–P coatings on magnesium composite reinforced with multiwalled carbon nanotube under specific coating conditions was performed. The electroless coating bath consists of nickel sulphate (26 g/L), sodium hypo-phosphite (30 g/L) as reducing agent, sodium acetate (16 g/L) as stabilizer, and ammonium hydrogen difluoride (8 g/L) as the complexing agent. The surfactant SLS was added in the solution for better wetting and spreading of coating on substrate. The stabilizer thiourea (1 ppm) was added in the bath to prevent decomposition of bath. Different nanoadditives such as ZnO, Al2O3, SiO with various concentrations were used in the bath and their influence on coating process characteristics were studied The nano additives such as ZnO, Al2O3, SiO were added at concentrations of 0.1%, 0.5%, 1%, and 2% in the EN bath. The output parameters such as surface roughness, microhardness, specific wear rate, and surface morphology were measured. Surface morphology was studied using scanning electron microscope. The results showed that the proposed method resulted in significant improvement on the quality of the coatings produced.","PeriodicalId":44668,"journal":{"name":"Advances in Tribology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2013-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2013/315965","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64405308","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: 17

Effect of Temperature and Electric Field on the Damping and Stiffness Characteristics of ER Fluid Short Squeeze Film Dampers 温度和电场对电流变流体短挤压膜阻尼器阻尼和刚度特性的影响

IF 2.6

Advances in Tribology Pub Date : 2013-11-21 DOI: 10.1155/2013/526428

H. Jagadish, L. Ravikumar

{"title":"Effect of Temperature and Electric Field on the Damping and Stiffness Characteristics of ER Fluid Short Squeeze Film Dampers","authors":"H. Jagadish, L. Ravikumar","doi":"10.1155/2013/526428","DOIUrl":"https://doi.org/10.1155/2013/526428","url":null,"abstract":"Squeeze film dampers are novel rotor dynamic devices used to alleviate small amplitude, large force vibrations and are used in conjunction with antifriction bearings in aircraft jet engine bearings to provide external damping as these possess very little inherent damping. Electrorheological (ER) fluids are controllable fluids in which the rheological properties of the fluid, particularly viscosity, can be controlled in accordance with the requirements of the rotor dynamic system by controlling the intensity of the applied electric field and this property can be utilized in squeeze film dampers, to provide variable stiffness and damping at a particular excitation frequency. The paper investigates the effect of temperature and electric field on the apparent viscosity and dynamic (stiffness and damping characteristics) of ER fluid (suspension of diatomite in transformer oil) using the available literature. These characteristics increase with the field as the viscosity increases with the field. However, these characteristics decrease with increase in temperature and shear strain rate as the viscosity of the fluid decreases with temperature and shear strain rate. The temperature is an important parameter as the aircraft jet engine rotors are located in a zone of high temperature gradients and the damper fluid is susceptible to large variations in temperature.","PeriodicalId":44668,"journal":{"name":"Advances in Tribology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2013-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2013/526428","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64140172","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: 2

MOORA-Based Tribological Studies on Red Mud Reinforced Aluminum Metal Matrix Composites 基于moora的赤泥增强铝金属基复合材料摩擦学研究

IF 2.6

Advances in Tribology Pub Date : 2013-11-14 DOI: 10.1155/2013/213914

S. Rajesh, S. Rajakarunakaran, R. Suthakarapandian, Pitchipoo Pandian

{"title":"MOORA-Based Tribological Studies on Red Mud Reinforced Aluminum Metal Matrix Composites","authors":"S. Rajesh, S. Rajakarunakaran, R. Suthakarapandian, Pitchipoo Pandian","doi":"10.1155/2013/213914","DOIUrl":"https://doi.org/10.1155/2013/213914","url":null,"abstract":"This paper presents the findings of an experimental investigation on the effects of applied load, sliding velocity, wt.% of reinforcement and hardness of the counterface material in dry sliding wear studies performed on red mud-based aluminum metal matrix composites (MMC). The specific wear rate and the coefficient of friction are considered as the output quality characteristics. Taguchi-based L9 orthogonal array has been used to accomplish the objective of the experimental study. Analysis of variance (ANOVA) is employed to find the optimal setting and the effect of each parameter on the output performance characteristics. It has been observed that optimal factor setting for each output performance is different. In order to minimize the two responses simultaneously, multiobjective optimization based on ratio analysis (MOORA) is adopted. MOORA revealed that the optimal combination of the dry sliding wear parameters for the multiperformance characteristics of the red mud based aluminium is the set normal load at 20 N, sliding velocity 3 m/s, % of reinforcement 20%, and counterface hardness of the material 58 HRC.","PeriodicalId":44668,"journal":{"name":"Advances in Tribology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2013-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2013/213914","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64392820","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: 22

Optimization of Tribological Properties of Nonasbestos Brake Pad Material by Using Steel Wool 用钢丝绒优化无石棉刹车片材料的摩擦学性能

IF 2.6

Advances in Tribology Pub Date : 2013-10-23 DOI: 10.1155/2013/165859

R. Vijay, M. J. Janesh, M. Saibalaji, V. Thiyagarajan

{"title":"Optimization of Tribological Properties of Nonasbestos Brake Pad Material by Using Steel Wool","authors":"R. Vijay, M. J. Janesh, M. Saibalaji, V. Thiyagarajan","doi":"10.1155/2013/165859","DOIUrl":"https://doi.org/10.1155/2013/165859","url":null,"abstract":"The gradual phasing out of typical brake pad material led to the spark of extensive research in development of alternatives. Henceforth we have performed a tribological study to improve the performance characteristics of the friction product (brake pad) by using steel wool, a metallic material which has an excellent structural reinforcement property and high thermal stability which are indeed required to improve the performance of the brake pad. Under the study, five frictional composites were developed and optimized using the same ingredients in an appropriate proportion except steel wool (0%, 4%, 8%, 12%, and 16%) which is compensated by synthetic barite, and the synthesized compositions are designated as Na01 to Na05. The developed pads are tested for tribological behaviour under conventional environment in a standard pin on disc tribometer. It is observed that increase in steel wool concentration resulted in high coefficient of friction and low wear rate of pad as resulted in Na05 composition. SEM analysis of the wear surface has proved to be useful in understanding the wear behaviour of the composites.","PeriodicalId":44668,"journal":{"name":"Advances in Tribology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2013-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2013/165859","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64383315","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: 26

Effect of Viscosity Variation on the Micropolar Fluid Squeeze Film Lubrication of a Short Journal Bearing 粘度变化对短轴颈轴承微极流体挤压膜润滑的影响

IF 2.6

Advances in Tribology Pub Date : 2013-10-03 DOI: 10.1155/2013/743987

N. Naduvinamani, A. K. Kadadi

引用次数: 10