Failure of Thin Film Lubrication—The Effect of Running-In on the Load Carrying Capacity of Thin-Film Lubricated Concentrated ContactsSource: Journal of Tribology:;1981:;volume( 103 ):;issue: 002::page 203DOI: 10.1115/1.3251628Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The effect of running-in under low speed - high load conditions on the load carrying capacity at high speed of sliding crossed cylinders of steel AISI 52100, thin film lubricated with a marine diesel engine oil of 60°C, is described for three values of the initial composite roughness Rc , i.e. 0.14 μm, 0.42 μm and 0.71 μm. It is shown that—irrespective of the initial surface roughness—the surface of the (smaller) stationary cylinder becomes very smooth (Ra ≤ 0.1 μm), that of the (larger) rotating cylinder remaining virtually unaffected. As the local radius of curvature increases as a result of running-in, the load carrying capacity, expressed in terms of total force on the contact, increases considerably, i.e. 600 percent at Rc = 0.14 μm, 500 percent at Rc = 0.42 μm and 150 percent at Rc = 0.71 μm. This is not accompanied by a correspondingly large increase in Hertzian contact pressure at film collapse, pHc . In fact pHc increases 45 percent at Rc = 0.14 μm and 15 percent at Rc = 0.42 μm and decreases 20 percent at Rc = 0.71 μm. It is further found that run-in surfaces show the phenomenon of delayed EHD-film collapse, meaning that the transition from the (partial) EHD to the scuffing regime may take from 1 to 40 s after application of the normal force. The test method should contribute significantly to the functional characterization of lubricants and—more in particular—running-in fluids, as candidates for use in concentrated contact situations.
keyword(s): Thin films , Load bearing capacity , Failure , Thin film lubrication , Cylinders , Collapse , Electrohydrodynamics , Force , Surface roughness , Stress , Pressure , Fluids , Composite materials , Steel , Lubricants AND Diesel engines ,
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contributor author | A. Begelinger | |
contributor author | A. W. J. de Gee | |
date accessioned | 2017-05-08T23:12:16Z | |
date available | 2017-05-08T23:12:16Z | |
date copyright | April, 1981 | |
date issued | 1981 | |
identifier issn | 0742-4787 | |
identifier other | JOTRE9-28641#203_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/95207 | |
description abstract | The effect of running-in under low speed - high load conditions on the load carrying capacity at high speed of sliding crossed cylinders of steel AISI 52100, thin film lubricated with a marine diesel engine oil of 60°C, is described for three values of the initial composite roughness Rc , i.e. 0.14 μm, 0.42 μm and 0.71 μm. It is shown that—irrespective of the initial surface roughness—the surface of the (smaller) stationary cylinder becomes very smooth (Ra ≤ 0.1 μm), that of the (larger) rotating cylinder remaining virtually unaffected. As the local radius of curvature increases as a result of running-in, the load carrying capacity, expressed in terms of total force on the contact, increases considerably, i.e. 600 percent at Rc = 0.14 μm, 500 percent at Rc = 0.42 μm and 150 percent at Rc = 0.71 μm. This is not accompanied by a correspondingly large increase in Hertzian contact pressure at film collapse, pHc . In fact pHc increases 45 percent at Rc = 0.14 μm and 15 percent at Rc = 0.42 μm and decreases 20 percent at Rc = 0.71 μm. It is further found that run-in surfaces show the phenomenon of delayed EHD-film collapse, meaning that the transition from the (partial) EHD to the scuffing regime may take from 1 to 40 s after application of the normal force. The test method should contribute significantly to the functional characterization of lubricants and—more in particular—running-in fluids, as candidates for use in concentrated contact situations. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Failure of Thin Film Lubrication—The Effect of Running-In on the Load Carrying Capacity of Thin-Film Lubricated Concentrated Contacts | |
type | Journal Paper | |
journal volume | 103 | |
journal issue | 2 | |
journal title | Journal of Tribology | |
identifier doi | 10.1115/1.3251628 | |
journal fristpage | 203 | |
journal lastpage | 208 | |
identifier eissn | 1528-8897 | |
keywords | Thin films | |
keywords | Load bearing capacity | |
keywords | Failure | |
keywords | Thin film lubrication | |
keywords | Cylinders | |
keywords | Collapse | |
keywords | Electrohydrodynamics | |
keywords | Force | |
keywords | Surface roughness | |
keywords | Stress | |
keywords | Pressure | |
keywords | Fluids | |
keywords | Composite materials | |
keywords | Steel | |
keywords | Lubricants AND Diesel engines | |
tree | Journal of Tribology:;1981:;volume( 103 ):;issue: 002 | |
contenttype | Fulltext |