Pub Date : 2017-11-26DOI: 10.1504/IJSURFSE.2017.10009269
Ž. Pavlović, S. Dedijer, N. Kašiković, D. Novaković, Magdolna Pál, D. Risović
In this study, three different approaches for characterisation of printing plate's non-printing elements surface structure and roughness were compared: stylus profilometric method, AFM, method and software (indirect), SEM image-based profilometry. The comparison was made to evaluate the possibility of utilising the different methods for characterisation of CTP offset printing plate surface roughness. The direct profilometric measurements involved the use of stylus profilometer visual analysis were made using AFM device and for the indirect approach, the Gwyddion software, for analysis of single and stereo SEM images and calculation of standard profilometric parameters, was used. The results of this study demonstrate that it is possible to obtain profilometric parameters from the analysis of AFM and SEM micrographs with appropriately calibrated grey scale intensity distribution and that the values of the parameters are comparable to those obtained by contact stylus profilometry. The results of this comparative study indicate that profilometric 2D direct stylus method is more applicable when larger areas tend to be measured, while the indirect image-based 3D profilometry is a valuable and efficient tool for characterisation of various surface's topographies on micron scale sample areas.
{"title":"Evaluation of effective models of offset CTP plate aluminium oxide surface roughness characterisation","authors":"Ž. Pavlović, S. Dedijer, N. Kašiković, D. Novaković, Magdolna Pál, D. Risović","doi":"10.1504/IJSURFSE.2017.10009269","DOIUrl":"https://doi.org/10.1504/IJSURFSE.2017.10009269","url":null,"abstract":"In this study, three different approaches for characterisation of printing plate's non-printing elements surface structure and roughness were compared: stylus profilometric method, AFM, method and software (indirect), SEM image-based profilometry. The comparison was made to evaluate the possibility of utilising the different methods for characterisation of CTP offset printing plate surface roughness. The direct profilometric measurements involved the use of stylus profilometer visual analysis were made using AFM device and for the indirect approach, the Gwyddion software, for analysis of single and stereo SEM images and calculation of standard profilometric parameters, was used. The results of this study demonstrate that it is possible to obtain profilometric parameters from the analysis of AFM and SEM micrographs with appropriately calibrated grey scale intensity distribution and that the values of the parameters are comparable to those obtained by contact stylus profilometry. The results of this comparative study indicate that profilometric 2D direct stylus method is more applicable when larger areas tend to be measured, while the indirect image-based 3D profilometry is a valuable and efficient tool for characterisation of various surface's topographies on micron scale sample areas.","PeriodicalId":14460,"journal":{"name":"International Journal of Surface Science and Engineering","volume":"11 1","pages":"433"},"PeriodicalIF":0.8,"publicationDate":"2017-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49659709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-26DOI: 10.1504/IJSURFSE.2017.10009289
Yangyi Xiao, W. Shi, Jing Luo
For layered solids consisting of physical vapour deposition coatings on steel substrates in lubricated line contacts, the elastohydrodynamic lubrication (EHL) behaviour is studied by the full-system finite element approach. Numerical solutions illustrate that the coating thickness, elastic modulus, and operating conditions have significant influences upon the EHL film pressure and thickness profiles, along with the coefficient of friction. Results for stress distributions provide insight into the tendency for yielding, pitting, and interfacial delamination in coated bodies. Furthermore, the film pressure and stress status induced by the interfacial micro-valley as well as rough coating surface and interface are investigated. It is demonstrated that optimised multi-layer coatings are propitious to reduce the stress gradient and failure risks of coated materials.
{"title":"Mechanical responses of coated solids in elastohydrodynamically lubricated line contacts","authors":"Yangyi Xiao, W. Shi, Jing Luo","doi":"10.1504/IJSURFSE.2017.10009289","DOIUrl":"https://doi.org/10.1504/IJSURFSE.2017.10009289","url":null,"abstract":"For layered solids consisting of physical vapour deposition coatings on steel substrates in lubricated line contacts, the elastohydrodynamic lubrication (EHL) behaviour is studied by the full-system finite element approach. Numerical solutions illustrate that the coating thickness, elastic modulus, and operating conditions have significant influences upon the EHL film pressure and thickness profiles, along with the coefficient of friction. Results for stress distributions provide insight into the tendency for yielding, pitting, and interfacial delamination in coated bodies. Furthermore, the film pressure and stress status induced by the interfacial micro-valley as well as rough coating surface and interface are investigated. It is demonstrated that optimised multi-layer coatings are propitious to reduce the stress gradient and failure risks of coated materials.","PeriodicalId":14460,"journal":{"name":"International Journal of Surface Science and Engineering","volume":"11 1","pages":"450"},"PeriodicalIF":0.8,"publicationDate":"2017-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42896871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-26DOI: 10.1504/IJSURFSE.2017.088120
E. Güler, E. Konca, I. Karakaya
Composite electroplating of solid lubricants in a metal matrix is an effective way to lower coefficient of friction (COF) and improve wear resistance of surfaces in sliding contact. In this work, Ni-MoS2 composite coatings were deposited on AISI 304 stainless steel substrates by electroplating from Watts bath containing suspended MoS2 particles and their tribological behaviour was studied. The effects of MoS2 particle concentration (5, 10 and 30 g/l), MoS2 particle size (1.440 and 5.156 m), pH (2, 3 and 4), current density (3.8, 4.8 and 5.8 A/dm2) and the surfactant (sodium lignosulfonate, SLS) concentration (0.3 and 1 g/l) on the tribological behaviour were investigated using a ball-on-disc tribometer at ambient conditions. Lower current density, smaller particle size and higher concentration of MoS2 decreased COF. While increasing the surfactant concentration decreased the COF, its friction lowering effect was much more pronounced at relatively lower concentrations of MoS2 in the electrolyte.
{"title":"Investigation of the tribological behaviour of electrocodeposited Ni-MoS2 composite coatings","authors":"E. Güler, E. Konca, I. Karakaya","doi":"10.1504/IJSURFSE.2017.088120","DOIUrl":"https://doi.org/10.1504/IJSURFSE.2017.088120","url":null,"abstract":"Composite electroplating of solid lubricants in a metal matrix is an effective way to lower coefficient of friction (COF) and improve wear resistance of surfaces in sliding contact. In this work, Ni-MoS2 composite coatings were deposited on AISI 304 stainless steel substrates by electroplating from Watts bath containing suspended MoS2 particles and their tribological behaviour was studied. The effects of MoS2 particle concentration (5, 10 and 30 g/l), MoS2 particle size (1.440 and 5.156 m), pH (2, 3 and 4), current density (3.8, 4.8 and 5.8 A/dm2) and the surfactant (sodium lignosulfonate, SLS) concentration (0.3 and 1 g/l) on the tribological behaviour were investigated using a ball-on-disc tribometer at ambient conditions. Lower current density, smaller particle size and higher concentration of MoS2 decreased COF. While increasing the surfactant concentration decreased the COF, its friction lowering effect was much more pronounced at relatively lower concentrations of MoS2 in the electrolyte.","PeriodicalId":14460,"journal":{"name":"International Journal of Surface Science and Engineering","volume":"11 1","pages":"418"},"PeriodicalIF":0.8,"publicationDate":"2017-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJSURFSE.2017.088120","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41562828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-11-26DOI: 10.1504/IJSURFSE.2017.10009252
S. Rani
This paper deals with the comparison of lubricant properties and environmental effect of newly developed bio-lubricant based on rice bran oil. The various lubricant properties like rheological, tribological, thermal properties, oxidative stability, corrosive stability, biodegradability and toxicity of the formulated oil have been evaluated and compared with a commercially available lubricant SAE 20W40. The formulated oil from rice bran oil is found to be highly biodegradable, less corrosive and non-toxic. Even though the coefficient of friction of the formulated oil is less compared to SAE 20W40, the wear scar diameter is slightly high compared to SAE 20W40.
{"title":"The evaluation of lubricant properties and environmental effect of bio-lubricant developed from rice bran oil","authors":"S. Rani","doi":"10.1504/IJSURFSE.2017.10009252","DOIUrl":"https://doi.org/10.1504/IJSURFSE.2017.10009252","url":null,"abstract":"This paper deals with the comparison of lubricant properties and environmental effect of newly developed bio-lubricant based on rice bran oil. The various lubricant properties like rheological, tribological, thermal properties, oxidative stability, corrosive stability, biodegradability and toxicity of the formulated oil have been evaluated and compared with a commercially available lubricant SAE 20W40. The formulated oil from rice bran oil is found to be highly biodegradable, less corrosive and non-toxic. Even though the coefficient of friction of the formulated oil is less compared to SAE 20W40, the wear scar diameter is slightly high compared to SAE 20W40.","PeriodicalId":14460,"journal":{"name":"International Journal of Surface Science and Engineering","volume":"11 1","pages":"403"},"PeriodicalIF":0.8,"publicationDate":"2017-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46881408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-10-16DOI: 10.1504/IJSURFSE.2017.10008356
Vivek Kumar, Satish C. Sharma
This paper concerns with the theoretical investigation to predict the combined influence of couple stress lubricant and tilt between bearing pad surfaces, on the performance of externally pressurised annular recess thrust pad bearing. Stokes micro-continuum theory is used to derive modified Reynolds equation accounting for the presence of couple stress additives in lubricant. A MATLAB code has been developed to solve the governing equation using FEM technique. Influence of annular recess location and tilt between pad surfaces are investigated on the performance of hydrostatic thrust pad bearing. It has been observed that the use of couple stress lubricant significantly improves the performance of annular recessed hydrostatic thrust pad bearing. Presence of tilt between bearing surfaces proved to be beneficial in terms of dynamic characteristics of bearing system.
{"title":"Study of annular recess hydrostatic tilted thrust pad bearing under the influence of couple stress lubricant behaviour","authors":"Vivek Kumar, Satish C. Sharma","doi":"10.1504/IJSURFSE.2017.10008356","DOIUrl":"https://doi.org/10.1504/IJSURFSE.2017.10008356","url":null,"abstract":"This paper concerns with the theoretical investigation to predict the combined influence of couple stress lubricant and tilt between bearing pad surfaces, on the performance of externally pressurised annular recess thrust pad bearing. Stokes micro-continuum theory is used to derive modified Reynolds equation accounting for the presence of couple stress additives in lubricant. A MATLAB code has been developed to solve the governing equation using FEM technique. Influence of annular recess location and tilt between pad surfaces are investigated on the performance of hydrostatic thrust pad bearing. It has been observed that the use of couple stress lubricant significantly improves the performance of annular recessed hydrostatic thrust pad bearing. Presence of tilt between bearing surfaces proved to be beneficial in terms of dynamic characteristics of bearing system.","PeriodicalId":14460,"journal":{"name":"International Journal of Surface Science and Engineering","volume":"11 1","pages":"344"},"PeriodicalIF":0.8,"publicationDate":"2017-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47961535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-10-16DOI: 10.1504/IJSURFSE.2017.10008361
Xin Wen, Kechen Song, Menghui Niu, Dong Zhipeng, Yunhui Yan
Three-dimensional (3D) inspection technology is a new important research hotspot in the field of steel surface defect inspection. However, current 3D information acquisition methods (i.e., the passive stereo vision method and active structured light method) still suffer from several issues. In order to solve these issues, a three-dimensional inspection system is designed in this paper. In this system, the passive stereo vision method and active structured light method are combined to obtain the surface sample height information of high temperature steel plate. Furthermore, the Hexagonal grid Census (Hg_Census) transform is proposed to improve the robustness of census transform stereo matching. Moreover, the passive stereo disparity map is adopted as a constraint condition to realise phase matching using wrapped phase. In addition, the local phase matching and sub-pixel disparity refinement are proposed to obtain high measuring accuracy. Three high temperature steel plate surface samples are picked to verify the effectiveness of the proposed method. The actual experimental results present the average error is less than 1 mm.
{"title":"3D inspection technology combining passive stereo matching and active structured light for steel plate surface sample","authors":"Xin Wen, Kechen Song, Menghui Niu, Dong Zhipeng, Yunhui Yan","doi":"10.1504/IJSURFSE.2017.10008361","DOIUrl":"https://doi.org/10.1504/IJSURFSE.2017.10008361","url":null,"abstract":"Three-dimensional (3D) inspection technology is a new important research hotspot in the field of steel surface defect inspection. However, current 3D information acquisition methods (i.e., the passive stereo vision method and active structured light method) still suffer from several issues. In order to solve these issues, a three-dimensional inspection system is designed in this paper. In this system, the passive stereo vision method and active structured light method are combined to obtain the surface sample height information of high temperature steel plate. Furthermore, the Hexagonal grid Census (Hg_Census) transform is proposed to improve the robustness of census transform stereo matching. Moreover, the passive stereo disparity map is adopted as a constraint condition to realise phase matching using wrapped phase. In addition, the local phase matching and sub-pixel disparity refinement are proposed to obtain high measuring accuracy. Three high temperature steel plate surface samples are picked to verify the effectiveness of the proposed method. The actual experimental results present the average error is less than 1 mm.","PeriodicalId":14460,"journal":{"name":"International Journal of Surface Science and Engineering","volume":"11 1","pages":"299"},"PeriodicalIF":0.8,"publicationDate":"2017-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46702637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-10-16DOI: 10.1504/IJSURFSE.2017.10008354
R. Maheswaran, J. Sunil
In gear boxes, the life of gears is increased by reducing the wear caused due to the friction between the rubbing surfaces of gears. This paper addresses on the study of the relative anti-wear property of nano garnet gear lubricant which are formulated by dispersing 0.25 wt%, and 0.50 wt% of nano garnet particles in commercially available SN500 grade gear lubricant oil through a standard two-step method. The anti-wear property of the lubricant is estimated by a four-ball wear test and is measured through the microscopic investigations on the surface texture modifications namely width of the wear ring and wear scar diameter. The width of wear ring is reduced to 3.83%, 6.39%, and the wear scar diameter is reduced to 6.1%, 2.44% due to the addition of 0.25 wt%, and 0.50 wt% of particle concentrations at a maximum applied load of 588N due to the rolling effect of nano garnet particles.
{"title":"Relative anti-wear property evaluation of nano garnet gear lubricant","authors":"R. Maheswaran, J. Sunil","doi":"10.1504/IJSURFSE.2017.10008354","DOIUrl":"https://doi.org/10.1504/IJSURFSE.2017.10008354","url":null,"abstract":"In gear boxes, the life of gears is increased by reducing the wear caused due to the friction between the rubbing surfaces of gears. This paper addresses on the study of the relative anti-wear property of nano garnet gear lubricant which are formulated by dispersing 0.25 wt%, and 0.50 wt% of nano garnet particles in commercially available SN500 grade gear lubricant oil through a standard two-step method. The anti-wear property of the lubricant is estimated by a four-ball wear test and is measured through the microscopic investigations on the surface texture modifications namely width of the wear ring and wear scar diameter. The width of wear ring is reduced to 3.83%, 6.39%, and the wear scar diameter is reduced to 6.1%, 2.44% due to the addition of 0.25 wt%, and 0.50 wt% of particle concentrations at a maximum applied load of 588N due to the rolling effect of nano garnet particles.","PeriodicalId":14460,"journal":{"name":"International Journal of Surface Science and Engineering","volume":"11 1","pages":"320"},"PeriodicalIF":0.8,"publicationDate":"2017-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41880185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-10-16DOI: 10.1504/IJSURFSE.2017.10008359
Y. Jang, Yong-jin Kang, Jong Kuk Kim
ta-C coating have found application for cutting tools. In this study, the effect of bias voltage on the physical properties of the coating and cutting performance were experimentally investigated. A bias voltages were applied with 0, 75, 150, 300 V and thicknesses were 430 nm. The results showed that the regardless of the bias voltage, the adhesion strength indicates that all ta-C coatings were HF 1. However, increasing bias voltage will increase the C = C boning at the coating, especially 150 and 300 V. Moreover, hardness values also decreased with increased bias voltage. For the cutting test, the ta-C coating from the lowest I(D)/I(G) value (0.5) with 75 V is selected. After cutting test, the adhesive of Al debris and delamination on the ta-C coated surface was three times lower than commercial DLC. This phenomenon shows that heat resistance of ta-C coating is dominant with high portion of sp3 fraction.
{"title":"The effect of substrate bias voltage on the adhesion strength of ta-C coated tools prepare by filtered cathode vacuum arc","authors":"Y. Jang, Yong-jin Kang, Jong Kuk Kim","doi":"10.1504/IJSURFSE.2017.10008359","DOIUrl":"https://doi.org/10.1504/IJSURFSE.2017.10008359","url":null,"abstract":"ta-C coating have found application for cutting tools. In this study, the effect of bias voltage on the physical properties of the coating and cutting performance were experimentally investigated. A bias voltages were applied with 0, 75, 150, 300 V and thicknesses were 430 nm. The results showed that the regardless of the bias voltage, the adhesion strength indicates that all ta-C coatings were HF 1. However, increasing bias voltage will increase the C = C boning at the coating, especially 150 and 300 V. Moreover, hardness values also decreased with increased bias voltage. For the cutting test, the ta-C coating from the lowest I(D)/I(G) value (0.5) with 75 V is selected. After cutting test, the adhesive of Al debris and delamination on the ta-C coated surface was three times lower than commercial DLC. This phenomenon shows that heat resistance of ta-C coating is dominant with high portion of sp3 fraction.","PeriodicalId":14460,"journal":{"name":"International Journal of Surface Science and Engineering","volume":"11 1","pages":"370"},"PeriodicalIF":0.8,"publicationDate":"2017-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41987733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-10-16DOI: 10.1504/IJSURFSE.2017.10008360
A. Jourani
Fractal theory is usually used to investigate the topography of machined surfaces, but the relationship between fractal dimensions and wear rate is less studied. A contribution in this field is proposed with wear tests performed on the AISI 1046 steel after the grinding by use of the P80, P180 and P320 abrasive sheets. A 3D fractal study of the worn surfaces is carried out by using power spectral density (PSD) in order to examine the relationship between rate of wear and its 3D fractal dimension. The 3D fractal analysis of the worn surfaces showed that higher values of fractal dimensions indicate a larger real contact area and therefore a better wear resistance of the AISI 1046 steel.
{"title":"Correlation between 3D fractal dimension and abrasive wear resistance","authors":"A. Jourani","doi":"10.1504/IJSURFSE.2017.10008360","DOIUrl":"https://doi.org/10.1504/IJSURFSE.2017.10008360","url":null,"abstract":"Fractal theory is usually used to investigate the topography of machined surfaces, but the relationship between fractal dimensions and wear rate is less studied. A contribution in this field is proposed with wear tests performed on the AISI 1046 steel after the grinding by use of the P80, P180 and P320 abrasive sheets. A 3D fractal study of the worn surfaces is carried out by using power spectral density (PSD) in order to examine the relationship between rate of wear and its 3D fractal dimension. The 3D fractal analysis of the worn surfaces showed that higher values of fractal dimensions indicate a larger real contact area and therefore a better wear resistance of the AISI 1046 steel.","PeriodicalId":14460,"journal":{"name":"International Journal of Surface Science and Engineering","volume":"11 1","pages":"289"},"PeriodicalIF":0.8,"publicationDate":"2017-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46861296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-08-04DOI: 10.1504/IJSURFSE.2017.10006720
Dharmendra Jain, Satish C. Sharma
This paper deals with the comparative performance of the two-lobe and circular hybrid journal bearing systems compensated with membrane restrictor. The combined influence of geometric imperfection of journal and the couple stress behaviour of the lubricant has been taken into the consideration. The non-Newtonian behaviour of the lubricant has been modelled using Stokes couple stress fluid model. The Reynolds equation has been modified to consider the couple stress fluid behaviour and has been solved by the FE Galerkin's approach. The numerically computed results from present study indicates that the couple stress lubricant presents an improved bearing performance in terms of stability (threshold speed), fluid film stiffness and damping coefficients vis-a-vis the corresponding bearing lubricated with Newtonian fluid. Further, the comparative performance of this class of bearings has been evaluated for the capillary, orifice and CFV restrictors.
{"title":"Combined influence of couple stress lubricant and geometric imperfections of journal on the performance of membrane compensated two-lobe hybrid journal bearing","authors":"Dharmendra Jain, Satish C. Sharma","doi":"10.1504/IJSURFSE.2017.10006720","DOIUrl":"https://doi.org/10.1504/IJSURFSE.2017.10006720","url":null,"abstract":"This paper deals with the comparative performance of the two-lobe and circular hybrid journal bearing systems compensated with membrane restrictor. The combined influence of geometric imperfection of journal and the couple stress behaviour of the lubricant has been taken into the consideration. The non-Newtonian behaviour of the lubricant has been modelled using Stokes couple stress fluid model. The Reynolds equation has been modified to consider the couple stress fluid behaviour and has been solved by the FE Galerkin's approach. The numerically computed results from present study indicates that the couple stress lubricant presents an improved bearing performance in terms of stability (threshold speed), fluid film stiffness and damping coefficients vis-a-vis the corresponding bearing lubricated with Newtonian fluid. Further, the comparative performance of this class of bearings has been evaluated for the capillary, orifice and CFV restrictors.","PeriodicalId":14460,"journal":{"name":"International Journal of Surface Science and Engineering","volume":"11 1","pages":"191"},"PeriodicalIF":0.8,"publicationDate":"2017-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43497322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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