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Isothermal Elastohydrodynamic Lubrication of Point Contacts: Part III—Fully Flooded Results
ASME International - Tập 99 Số 2 - Trang 264-275 - 1977
B. J. Hamrock, D. Dowson
Utilizing the theory developed by the authors in an earlier publication, the influence of the ellipticity parameter, the dimensionless speed, load, and material parameters on minimum film thickness was investigated. The ellipticity parameter was varied from one (a ball on a plate configuration) to eight (a configuration approaching a line contact). The dimensionless speed parameter was var...... hiện toàn bộ
Hydrodynamic Lubrication of Hydrostatic Extrusion
ASME International - Tập 98 Số 1 - Trang 27-31 - 1976
W. R. D. Wilson, S.M. Mahdavian
An analytical model for the hydrodynamic lubrication of hydrostatic extrusion is developed. This includes the effect of viscous heating on the film formation process and the effect of viscous and plastic heating on the friction and film thickness variation in the work zone. Theoretical predictions of film thickness and extrusion pressure show good agreement with experimental measurements f...... hiện toàn bộ
Lubricant Flow in a Plastohydrodynamic Work Zone
ASME International - Tập 98 Số 1 - Trang 16-21 - 1976
S.M. Mahdavian, W. R. D. Wilson
An analysis of the lubricant flow in zones of plastic deformation is developed. This includes the effects of different surface temperatures and shear heating within the lubricant film. Thermal effects on the lubricant velocity and temperature profile, traction and volume flow rate are described. The difference in surface temperatures plays a dominant role in deciding the variation of lubri...... hiện toàn bộ
The Surface Deformation of Aluminum Compressed With Viscous Lubricants
ASME International - Tập 96 Số 4 - Trang 591-594 - 1974
D. D. Ratnagar, H. S. Cheng, J. A. Schey
The influences of lubricant viscosity and loading velocity on the surface finish of plastically compressed 6061 aluminum alloy cylinders were studied. Specimens with polished end faces were subjected to compression between two flat, chromium plated dies, with lubricants of a viscosity ranging from 42 cp to 1207 cp at 38 deg C. The deformed surfaces were studied under a scanning electron mi...... hiện toàn bộ
An Isoviscous Model for the Hydrodynamic Lubrication of Plane Strain Forging Processes With Flat Dies
ASME International - Tập 96 Số 4 - Trang 539-546 - 1974
W. R. D. Wilson
Transient isoviscous hydrodynamic theory is used to investigate the lubrication of plane strain forging processes with flat dies. It is shown that during yielding a film which decreases from a maximum thickness at the center of the contact to zero at the edges is formed. As the deformation continues, the film is transported outwards at half the surface speed of the workpiece. In the case w...... hiện toàn bộ
A Hydrodynamic Lubrication Theory for Strip Rolling Including Thermal Effects
ASME International - Tập 97 Số 1 - Trang 4-12 - 1975
T. A. Dow, J. W. Kannel, Sargit S. Bupara
A model of hydrodynamically lubricated cold rolling including thermal and pressure effects on the lubricant is developed in this paper. The hydrodynamic film thickness is calculated as well as the work zone pressure and shear stress distribution for several conditions assuming that the lubricant behaves as a Newtonian fluid. Pressure measurements made with vapor-deposited thin-film transdu...... hiện toàn bộ
Analysis of the Lubricant Film Formation Process in Plane Strain Forging
ASME International - Tập 96 Số 4 - Trang 605-610 - 1974
W. R. D. Wilson, Chun-kuen Wong
A thermal Reynolds’ equation is developed for a lubricant with an exponential viscosity-temperature variation. The equation is used to analyze the film formation process in liquid lubricated plane strain forging. The effects of temperature and pressure induced viscosity changes on the film formation process are described.
Workpiece Surface Roughening in a Hydrodynamically Lubricated Metal Forming Process
ASME International - Tập 99 Số 1 - Trang 10-14 - 1977
W. R. D. Wilson
A mathematical model for the roughening of the workpiece in a hydrodynamically lubricated metal forming process is developed. Roughening is assumed to result from local variations in the workpiece flow strength. The results of the analysis are compared with previous experimental measurements.
Piston Ring Lubrication and Cylinder Bore Wear Analyses, Part II—Theory Verification
ASME International - Tập 96 Số 2 - Trang 258-266 - 1974
L. L. Ting, Jörg Mayer
Based on the analytical method presented in the previous paper (Part I), comparisons of predicted wear curves along the major and minor side-thrust sides of the cylinder bore are made with the measured ones obtained from several truck engines for various vehicle mileages. The agreement was found to be good. This indicates the analytical model developed in Part I is relevant and suitable fo...... hiện toàn bộ
Piston Ring Lubrication and Cylinder Bore Wear Analysis, Part I—Theory
ASME International - Tập 96 Số 3 - Trang 305-313 - 1974
L. L. Ting, Jörg Mayer
An analytical method developed for determining the bore wear pattern for a reciprocating piston engine over a complete running cycle is presented. The method includes the considerations of the hydrodynamic lubrication theory between the ring and the cylinder bore wall, piston ring geometric and elastic characteristics, blowby through the piston ring pack, minimum film thickness permitting ...... hiện toàn bộ
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