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TECHNICAL PAPERS

A New Approach to the Effect of EP Additive and Surface Roughness on the Pitting Fatigue of a Line-Contact System

[+] Author and Article Information
Chau Chang Chou, Jen Fin Lin

Department of Mechanical Engineering, National Cheng Kung University, Tainan, 70101, Taiwan, ROC

J. Tribol 124(2), 245-258 (Mar 13, 2001) (14 pages) doi:10.1115/1.1396344 History: Received July 12, 2000; Revised March 13, 2001
Copyright © 2002 by ASME
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References

Figures

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Schematic view of the apparatus and arrangement of the principal working parts
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Diagrammatic representation of the disk, dimensions given in millimeters
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(a) The positions of three points, C, A, and F on driver’s contact surface: (b) the wear mechanisms of the contact surface corresponding to these three points (C, F: sliding induced transverse cracks; A: pure rolling induced longitudinal deformation).
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A typical variation of oil temperature and friction coefficient acquired by the second kind of test for the smooth roller +1 vol. percent EP additive. The dash lines indicate the intermittent pauses.
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Variation of crack length at various test time periods. The disk in contact with rough rollers was lubricated by two lubricants. The applied load is 1957.3 N and the rotational speed is 450 rpm. They are obtained through the first kind test.
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Vickers hardness for the disk specimens of having the longest and shortest pitting lives. They were obtained by means of the second kind of test. The number on the top of each error bar indicates the pitting life. The applied load is 1957.3 N and the rotational speed is 450 rpm.
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Hardness rises of the disk specimen varying with pitting life. Rollers of the same roughness were lubricated by two lubricants under the load of 1957.3 N and at the rotational speed of 450 rpm. They were obtained by undergoing the second kind of test.
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Typical force-distance curve obtained in the use of an atomic force microscopy
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The pull-off forces were measures by an AFM for the disk specimens of having four testing periods. They are obtained by employing the first kind of test.
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Cracks shown in the disk specimens in contact with rough rollers, they were created using the base oil as lubricant. The test time is (a) 0.5 hour, (b) 3 hours, and (c) 5 hours. The applied load is 1957.3 N and the rotational speed is 450 rpm.
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Cracks shown in the disk specimens in contact with rough rollers, they were produced using the base oil +1 vol. percent EP additive as lubricant. The test time is (a) 0.5 hour, (b) 3 hours, (c) 5 hours, and (d) 10 hours. The applied load is 1957.3 N and the rotational speed is 450 rpm.
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Weibull plots for the fatigue life of the disk specimen, they are obtained for three sets of combinations in roller’s roughness and lubricating oil
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Vickers harnesses measured at various depths beneath the contact surface of the disk specimen. These four samples are obtained of having the longest pitting life as shown in Fig. 6.
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The crack angle exhibited at the elastic/plastic shakedown layer for the disk specimen in contact with the smooth rollers. The base oil +1 vol. percent EP additive was used as lubricant, it was operating under the load of 1957.3 N and the rotational speed of 450 rpm.
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(a) High-magnification photographic montage, and (b) the corresponding schematic draft showing the ratchetting layer, the shakedown layer, and the elastic layer at subsurface zone etched with 3 percent nital. This disk specimen was lubricated by the base oil +1 vol.% EP additive, and in contact with rough rollers.
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Branched cracks created in the disk specimen in contact with rough rollers, the base oil was used as the lubricant. The P0/k value is about 2.54.

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