Advances in Tribology最新文献_第7页

Effect of Ratio on the Performance of Two-Lobe Pressure Dam Bearing: Micropolar Lubricated 比值对双叶压坝轴承性能的影响:微极润滑

IF 2.6

Advances in Tribology Pub Date : 2015-02-25 DOI: 10.1155/2015/182713

Sanyam Sharma, C. M. Krishna

引用次数: 11

Couple Stress Squeeze Films with VPD in a Curved Circular Geometry 弯曲圆形几何中与VPD耦合的应力挤压膜

IF 2.6

Advances in Tribology Pub Date : 2015-02-11 DOI: 10.1155/2015/164691

V. Ponnuswamy, S. Govindaraj

引用次数: 2

Effect of Surface Roughness on the Squeeze Film Characteristics of Circular Plates in the Presence of Conducting Couplestress Fluid and Transverse Magnetic Field 导电耦合应力流体和横向磁场作用下，表面粗糙度对圆板挤压膜特性的影响

IF 2.6

Advances in Tribology Pub Date : 2015-01-29 DOI: 10.1155/2015/302396

S. T. Fathima, N. Naduvinamani, J. S. Kumar, B. Hanumagowda

引用次数: 5

Prediction and Analysis of Engine Friction Power of a Diesel Engine Influenced by Engine Speed, Load, and Lubricant Viscosity 转速、负荷和润滑油粘度对柴油机摩擦功率影响的预测与分析

IF 2.6

Advances in Tribology Pub Date : 2014-12-09 DOI: 10.1155/2014/928015

D. Singh, F. Gu, J. Fieldhouse, N. Singh, S. K. Singal

{"title":"Prediction and Analysis of Engine Friction Power of a Diesel Engine Influenced by Engine Speed, Load, and Lubricant Viscosity","authors":"D. Singh, F. Gu, J. Fieldhouse, N. Singh, S. K. Singal","doi":"10.1155/2014/928015","DOIUrl":"https://doi.org/10.1155/2014/928015","url":null,"abstract":"Automotive industries made a paradigm shift in selection of viscometrics of engine lubricant, from higher to lower viscosity grade, for improving fuel economy of vehicles. Engine fuel consumption is influenced by friction between the various engine components. Engine friction power (FP) of a direct injection diesel engine is calculated from the measured value of in-cylinder pressure signals at various operating conditions. For predicting FP, as a function of speed, load, and lubricant viscosity, a full factorial design of experiments (DOE) was formulated and an empirical correlation was developed. Response surface methodology (RSM) was used for analyzing the dominant parameters and their interactions, which influence engine friction power significantly. Predicted results of engine FP are in good agreement with measured values at all operating points. ANOVA and RSM analysis revealed that the significant parameters influencing engine FP are speed, load, viscosity, speed-load, and speed-viscosity. The effect of engine lubricant viscosity on friction power of a diesel engine was insignificant at low speed, whereas, at high speed, it played a vital role. The empirical relation developed for predicting FP is very useful in estimating engine friction power for various combinations of engine speeds, loads, and lubricant viscosity without running the engine.","PeriodicalId":44668,"journal":{"name":"Advances in Tribology","volume":"2014 1","pages":"928015"},"PeriodicalIF":2.6,"publicationDate":"2014-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/928015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64747406","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

Dynamic Mechanical Analysis and Three-Body Abrasive Wear Behaviour of Thermoplastic Copolyester Elastomer Composites 热塑性共聚酯弹性体复合材料的动态力学分析及三体磨粒磨损行为

IF 2.6

Advances in Tribology Pub Date : 2014-11-19 DOI: 10.1155/2014/210187

H. Rajashekaraiah, Sekar Mohan, P. K. Pallathadka, Suresha Bhimappa

引用次数: 30

Jet-Impingement Effects of Alumina-Nanofluid on Aluminum and Copper 氧化铝纳米流体对铝和铜的射流冲击效应

IF 2.6

Advances in Tribology Pub Date : 2014-08-21 DOI: 10.1155/2014/476175

G. Molina, Fnu Aktaruzzaman, Whitney Stregles, V. Soloiu, Mosfequr Rahman

{"title":"Jet-Impingement Effects of Alumina-Nanofluid on Aluminum and Copper","authors":"G. Molina, Fnu Aktaruzzaman, Whitney Stregles, V. Soloiu, Mosfequr Rahman","doi":"10.1155/2014/476175","DOIUrl":"https://doi.org/10.1155/2014/476175","url":null,"abstract":"Nanofluids are nanosize-powder suspensions that are of interest for their enhanced thermal transport properties. They are studied as promising alternatives to ordinary cooling fluids, but the tribiological effects of nanofluids on cooling-system materials are largely unknown. The authors have developed methodology that uses jet impingement on typical cooling-system materials to test such effects. The work is presented of the authors’ research on the interactions of a typical nanofluid (2% volume of alumina nanopowders in a solution of ethylene glycol in water) which is impinged on aluminum and copper specimens for tests as long as 112 hours. The surface changes were assessed by roughness measurements and optical-microscope studies. Comparative roughness indicate that both the reference cooling fluid of ethylene glycol and water and its nanofluid with 2% alumina produce roughness changes in aluminum (even for the shortest 3-hour test), but no significant roughness differences were observed between them. No significant roughness changes were observed for copper. Microscopy observations, however, show different surface modifications in both aluminum and copper by both the nanofluid and its base fluid. The possible mechanisms of early erosion are discussed. These investigations demonstrate suitable methods for the testing of nanofluid effects on cooling system-materials.","PeriodicalId":44668,"journal":{"name":"Advances in Tribology","volume":"2014 1","pages":"1-8"},"PeriodicalIF":2.6,"publicationDate":"2014-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/476175","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64510452","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

Tribological behavior of Ti-6Al-4V and Ti-6Al-7Nb Alloys for Total Hip Prosthesis 全髋关节假体用Ti-6Al-4V和Ti-6Al-7Nb合金的摩擦学行为

IF 2.6

Advances in Tribology Pub Date : 2014-07-21 DOI: 10.1155/2014/451387

M. Fellah, M. Labaiz, O. Assala, L. Dekhil, A. Taleb, Hadda Rezag, A. Iost

{"title":"Tribological behavior of Ti-6Al-4V and Ti-6Al-7Nb Alloys for Total Hip Prosthesis","authors":"M. Fellah, M. Labaiz, O. Assala, L. Dekhil, A. Taleb, Hadda Rezag, A. Iost","doi":"10.1155/2014/451387","DOIUrl":"https://doi.org/10.1155/2014/451387","url":null,"abstract":"The aim of the study is to evaluate the friction and wear behavior of high-strength alloys Ti-6Al-7Nb used in femoral stem and compare it with a Ti-6Al-4V alloy cylindrical bar corresponding to ISO 5832-3 part 3/01-07-199 standard. The tribological behavior was investigated by wear tests, using ball-on-disc and pin-on-disc tribometers. These tests consisted of measuring the weight loss and the friction coefficient of samples. The oscillating friction and wear tests have been carried out in ambient with oscillating tribotester in accordance with standards ISO 7148, ASTM G99-95a, and ASTM G133-95 under different conditions of normal loads (3, 6, and 10 N) and sliding speeds (1, 15, and 25 mm·s−1). As counter pairs, a 100Cr6 steel ball with 10 mm in diameter was used. Results show that the two alloys had similar friction and wear performance, although their grain structures and compositions are different. Occurrence of large frictional occurred, is probably caused by formation and periodic, localized fracture of a transfer layer. Higher friction with larger fluctuation and higher wear rate was observed at the higher siding speed. The Ti-6Al-4V wear mechanism transforms from ploughing and peeling off wear at low sliding speed to plastic deformation and adhesive wear.","PeriodicalId":44668,"journal":{"name":"Advances in Tribology","volume":"2014 1","pages":"1-13"},"PeriodicalIF":2.6,"publicationDate":"2014-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/451387","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64497237","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: 94

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":"2014 1","pages":"1-7"},"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":"2014 1","pages":"1-11"},"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