12friction and lubrication of thin liquid films

... The area of the hysteresis loop diminished progressively with the number of cycles and the rate of decay of the loop area also decreased with the number of cycles Johnson [4] and O’Connor and Johnson ... Chapter I3 within the region of gross slip The dependency of the creep displacement on the rate of ball displacement at the onset of dwell can be readily seen Figure 13.15 shows the plot of this relationship ... temperature through the thickness in the process of adjusting the arc voltage and the rate of flow of the liquid nitrogen to achieve repeatable thermal cycles of the desired range The extrapolated temperature...

Ngày tải lên: 05/08/2014, 09:20

... The area of the hysteresis loop diminished progressively with the number of cycles and the rate of decay of the loop area also decreased with the number of cycles Johnson [4] and O’Connor and Johnson ... Chapter I3 within the region of gross slip The dependency of the creep displacement on the rate of ball displacement at the onset of dwell can be readily seen Figure 13.15 shows the plot of this relationship ... temperature through the thickness in the process of adjusting the arc voltage and the rate of flow of the liquid nitrogen to achieve repeatable thermal cycles of the desired range The extrapolated temperature...

Ngày tải lên: 05/08/2014, 09:20

... Lindberg, R A., “Processes and Materials of Manufacture,” Allyn and Bacon, 1977, pp 628-637 “Wear Control Handbook”, ASME, 1980 Szeri, A Z., Tribology: Friction, Lubrication and Wear, Hemisphere, ... Scoring Under the Conditions of Simultaneous Rolling and Sliding of Bodies,” Wear, 1968, Vol 11, p 291 Kelley, B W., and Lemaski, A.J., Lubrication of Involute Gearing,” Proc Inst Mech Engrs, 1967-68, ... Konishi, T., and Nishizawa, Y “Fundamental Research on Gear Lubrication, ” Bull JSME, 1962, Vol 5( 19), p 561 Drozdov, Y N., and Gavrikov, Y A., “Friction and Scoring Under the Conditions of Simultaneous...

Ngày tải lên: 13/12/2013, 03:15

... Selection and Application, Duane Tandeske 73 Zinc Handbook: Properties, Processing, and Use in Design, Frank Porter 74 Thermal Fatigue of Metals, Andrzej Weronski and Tadeusz Hejwowski 75 Classical and ... Revised and Expanded, Earl Logan, Jr 86 Vibrations of Shells and Plates: Second Edition, Revised and Expanded, Werner Soedel 87 Steam Plant Calculations Manual: Second Edition, Revised and Ex panded, ... Understanding Gear Noise, J Derek Smith Chains for Power Transmission and Material Handling: Design and Applications Handbook, American Chain Association Corrosion and Corrosion Protection Handbook,...

Ngày tải lên: 13/12/2013, 03:15

... period, and all of them had some pain and functional impairment with moderate activity There was one case of soft tissue recurrence of GCT after years which was treated with excision of mass and ... tumor of distal radius: a report of 12 cases and review of literature Journal of Orthopaedic Surgery and Research 2011 6:14 Submit your next manuscript to BioMed Central and take full advantage of: ... showing union of the fibular graft with the radius Page of Of the 12 patients analysed, there were males and females with left sided and right sided involvement of distal radius The mean age of patients...

Ngày tải lên: 20/06/2014, 04:20

... period, and all of them had some pain and functional impairment with moderate activity There was one case of soft tissue recurrence of GCT after years which was treated with excision of mass and ... tumor of distal radius: a report of 12 cases and review of literature Journal of Orthopaedic Surgery and Research 2011 6:14 Submit your next manuscript to BioMed Central and take full advantage of: ... showing union of the fibular graft with the radius Page of Of the 12 patients analysed, there were males and females with left sided and right sided involvement of distal radius The mean age of patients...

Ngày tải lên: 20/06/2014, 07:20

... 210 and 120 to 150 nm for samples B1, B2 and B3 The densities of ZnO nanowires for samples A1, A2 and A3 were 2.1, 2.2 and 2.0 109 wires cm-2, respectively, which are much higher than that of ... morphology and density of ZnO nanowire arrays, leading to the different performance of the DSSCs based on the ZnO nanowire films Figure shows the top-view and cross-sectional FESEM images of two samples ... densities of nanowire arrays for samples B1, B2 and B3 were lower than that of samples A1, A2 and A3, the short circuit current density (Isc) increased from 1.61–1.97 to 1.93–2.25 mA cm-2, and in...

Ngày tải lên: 22/06/2014, 00:20

... Selection and Application, Duane Tandeske 73 Zinc Handbook: Properties, Processing, and Use in Design, Frank Porter 74 Thermal Fatigue of Metals, Andrzej Weronski and Tadeusz Hejwowski 75 Classical and ... Revised and Expanded, Earl Logan, Jr 86 Vibrations of Shells and Plates: Second Edition, Revised and Expanded, Werner Soedel 87 Steam Plant Calculations Manual: Second Edition, Revised and Ex panded, ... Understanding Gear Noise, J Derek Smith Chains for Power Transmission and Material Handling: Design and Applications Handbook, American Chain Association Corrosion and Corrosion Protection Handbook,...

Ngày tải lên: 04/07/2014, 14:20

... aspects of lubrication Many experimental and theoretical studies have been undertaken to shed some light on the influence of the energy generated in the film, and the heat transfer within the film and ... England, 1966 Cope, W., “The Hydrodynamic Theory of Film Lubrication, ” Proc Roy Soc., 1948, Vol A197, pp 201-216 Szeri, A Z., “Some Extensions of the Lubrication Theory of Osborne Reynolds,” J of ... loaded area is a function of the generated pressure The study of the behavior of the lubricant film with consideration of the change of film geometry due to the elasticity of the contacting bodies...

Ngày tải lên: 04/07/2014, 14:20

... Selection and Application, Duane Tandeske 73 Zinc Handbook: Properties, Processing, and Use in Design, Frank Porter 74 Thermal Fatigue of Metals, Andrzej Weronski and Tadeusz Hejwowski 75 Classical and ... Revised and Expanded, Earl Logan, Jr 86 Vibrations of Shells and Plates: Second Edition, Revised and Expanded, Werner Soedel 87 Steam Plant Calculations Manual: Second Edition, Revised and Ex panded, ... Understanding Gear Noise, J Derek Smith Chains for Power Transmission and Material Handling: Design and Applications Handbook, American Chain Association Corrosion and Corrosion Protection Handbook,...

Ngày tải lên: 05/08/2014, 09:20

... film as the product of viscosity, speed, and area, divided by the thickness of the film The observations of Tower and Petrov proved to be the turning point in the history of lubrication Prior to ... aspects of lubrication Many experimental and theoretical studies have been undertaken to shed some light on the influence of the energy generated in the film, and the heat transfer within the film and ... England, 1966 Cope, W., “The Hydrodynamic Theory of Film Lubrication, ” Proc Roy Soc., 1948, Vol A197, pp 201-216 Szeri, A Z., “Some Extensions of the Lubrication Theory of Osborne Reynolds,” J of...

Ngày tải lên: 05/08/2014, 09:20

... “Axi-Symmetric Contact on Thin Compliant Coatings,” Journal of Mechanics and Physics of Solids, 1981, Vol 29, p 89 34 Maugis, D., and Barquins, M., “Fracture Mechanics and the Adherence of Viscoelastic ... of the two bodies respectively = N x N matrix of influence coefticients F = N x vector of forces Y = N x vector of slack variables (or final separation) e = N x vector of 1’s E = N x vector of ... Properties of Elastic Bodies in Contact, Mechanics of Contact between Deformable Bodies, University Press, Delft, Netherlands, 1975 32 Greenwood, J A., and Johnson, K L., “The Mechanics of Adhesion of...

Ngày tải lên: 05/08/2014, 09:20

... may cause fretting and surface cracks The prediction of the areas of microslip and the energy generated in the process are therefore of considerable interest to the designer of frictional joints ... application of loading 56 Traction Distribution and Microslip in Frictional Contacts 57 An important class of contact problems is that of two elastic bodies which are subjected to a combination of normal ... the literature [2-151, and the previous chapter gives an overview of procedures for evaluating the area of contact and the pressure distribution between elastic bodies of arbitrary smooth surface...

Ngày tải lên: 05/08/2014, 09:20

... contact area of 5.15 x 10-2in radius results from a normal load of 30001bf and the coefficient of friction is taken as 0.1 The tangential force of 1461bf and the twisting moment of 4.8in.-lbf ... technique (0.16502 x 10-4 in and 0.12263 x 10-4 rad for Case and 0.31257 x 10-4in and 0.30892 x 10-4rad for Case 2), with deviations of 2.39% and 0.49% for Case 1, and 2.31% and 5.92% for Case 2, respectively ... and the direction of the tractions are plotted in Figs 3.27 and 3.28 for Case with a twisting moment of 500 in.-lbf and in Figs 3.29 and 3.30 for Case with a twisting moment of 700 in.-lbf It...

Ngày tải lên: 05/08/2014, 09:20

... that friction and wear can be considerably influenced by controlling both physical and chemical properties of surface films and the art of antiwear additives is an integral part of lubrication ... review of the fundamentals of transient heat transfer and of some of the extensive literature on the subject Some representative results and equations are given to illustrate the effect of the ... involved in sliding, one of them softens while the other remains hard Transfer of metal occurs and one surface becomes smoother at the expense of the other The transfer of metal may occur on a...

Ngày tải lên: 05/08/2014, 09:20

... describes a generalized and efficient computer- based model developed by Rashid and Seireg [23], for the evaluation of heat partition and transient temperatures in dry and lubricated layered concentrated ... contact can be of considerable practical importance to the experimentalist and the designer Most of the theoretical analyses are based on computer solutions and the presentation of the results ... features: The use of finite difference with the alternating direction implicit method provides considerable inodeling flexibility and computing efficiency I t is capable of handling transient...

Ngày tải lên: 05/08/2014, 09:20

... Constancy of Scoring Temperature,” Interdisciplinary Approach to the Lubrication of Concentrated Contacts, P M Ku, Ed., NASA SP-237, 1970, p 153 Sakurai, T., “Role of Chemistry in the Lubrication of ... G., and Belin, M., “Chemical Films and Mixed Lubrication, ” Trans ASLE, 1983, Vol 26(3), p 293 Poon, S Y., “Role of Surface Degradation Film on the Tractive Behavior in Elastohydrodynamic Lubrication ... 6.1.4 P Whirl and Stability Considerations The whirl of rotors supported on fluid films is of considerable practical importance and it is no surprise that it has been the subject of numerous investigations...

Ngày tải lên: 05/08/2014, 09:20

... selection of the main design parameters to optimize the performance of the hydrodynamic bearing In spite of the wealth of literature on the analysis of these bearings, the selection of design ... quantity of oil flow required for adequate lubrication, minimizing the frictional loss, and so forth The objective may also be composed of a multitude of the previously mentioned factors, and weighing ... phase of the search deals with guidance of the entry point into the feasible region In this phase, incremental viscosity changes, of the order of 10%, and clearance changes, on the order of 0.001...

Ngày tải lên: 05/08/2014, 09:20

... selection of the main design parameters to optimize the performance of the hydrodynamic bearing In spite of the wealth of literature on the analysis of these bearings, the selection of design ... quantity of oil flow required for adequate lubrication, minimizing the frictional loss, and so forth The objective may also be composed of a multitude of the previously mentioned factors, and weighing ... phase of the search deals with guidance of the entry point into the feasible region In this phase, incremental viscosity changes, of the order of 10%, and clearance changes, on the order of 0.001...

Ngày tải lên: 05/08/2014, 09:20

... OperatingWithin a Range of Specified Loads and Speeds The previous design system is extended so that the optimum parameters, for a bearing operating with equal frequency within a given range of loads and ... Hunter and Zienkeiwicz [23] presented a theoretical study of the heat-energy balance of bearings and compared their findings with Cole’s results They concluded that the effect of temperature, and ... be 1.83 Corresponding to the numerical values of the parameters RCL/k and b9/(T 8)2, lines OX and OY are drawn in the second and the third quadrant of the nomogram (Fig 6.45) by interpolation if...

Ngày tải lên: 05/08/2014, 09:20