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TECHNICAL PAPERS

FEM Analysis of Hydrostatic Pressure Generated Within Lubricant Entrapped Into Pocket on Workpiece Surface in Upsetting Process

[+] Author and Article Information
Akira Azushima

Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Yokohama National University, Yokohama 240-8501, Japan

J. Tribol 122(4), 822-827 (Sep 21, 1999) (6 pages) doi:10.1115/1.1286160 History: Received August 11, 1999; Revised September 21, 1999
Copyright © 2000 by ASME
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References

Figures

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Specimens of axisymmetrical upsetting of cylinders having a central conical impression (a) and a central conical dent (b)
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Geometry and finite element discretization of two specimens of cylinders having a central conical impression (a) and a central conical dent (b)
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Distribution of non-dimensional pressure on the surface of cylinder having a central conical impression without oil (a) and with oil (b) (Y: yield stress; p: normal stress; q: hydrostatic pressure; r: reduction)
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Change of the hydrostatic pressure generated within lubricant with reduction when changing coefficient of friction
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Relationship between ratio of real contact area and reduction with oil and without oil in the pocket
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Change of hydrostatic pressure with reduction in height
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Sequential photographs of surface with pyramidal pockets of aluminum sheet being draw through quartz die with a lubricant having a viscosity of 1000 cSt.
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Models to account for oil permeation from surface pocket into real contact area
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Development of plastic area at reduction in height, for specimen B1
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Development of plastic area at reduction in height, for specimen B2
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Development of plastic area at reduction in height, for specimen B3

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