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TECHNICAL PAPERS

Influence of Material Anisotropy and Friction on Ring Deformation

[+] Author and Article Information
Han Han

Materials Forming, Department of Production Engineering, Royal Institute of Technology, 100 44 Stockholm, Sweden

J. Tribol 124(3), 637-644 (May 31, 2002) (8 pages) doi:10.1115/1.1473144 History: Received May 22, 2001; Revised January 29, 2002; Online May 31, 2002
Copyright © 2002 by ASME
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References

Kunogi,  M., 1956, “A New Method of Cold Extrusion,” Journal of the Scientific Research Institute, 50, pp. 215–246.
Male,  A. T. , 1964, “Coefficient of Friction Under Condition of Bulk Plastic Deformation,” J. Inst. Met., 93, pp. 38–46.
Garmong,  G. , 1977, “An Evaluation of the Ring Test for Strain-Rate-Sensitive Materials,” Metall. Trans. A, 8A, pp. 2026–2027.
Danckert,  J., 1988, “Analysis of the Ring Test Method for the Evaluation of Frictional Stresses in Bulk Metal Forming Processes,” Annals of the CIRP, 37(1), pp. 217–220.
Tan,  X., Martin,  P. A. F., Bay,  N., and Zhang,  W., 1998, “Friction Studies at Different Normal Pressures With Alternative Ring-Compression Tests,” J. Mater. Process. Technol., 80–81, pp. 292–297.
Edward, M. M., 1991, Metal Working Science and Engineering, McGraw-Hill, New York.
Bhattacharyya,  D., 1981, “Influence of Specimen Orientation on the Deformation of Rings,” Annals of the CIRP, 30(1), pp. 139–142.
Pöhlandt,  K., , 1998, “Concepts and Experiments for Characterizing Plastic Anisotropy of Round Bars, Wires, and Tubes,” Steel Res., 69, pp. 171–174.
Hill, R., 1985, The Mathematical Theory of Plasticity, Oxford University Press, New York.
Honeycombe, R. W. K., 1984, The Plastic Deformation of Metals, Edward Arnold Ltd.
Wagoner, R. H., and Chenot, J. L., 1996, Fundamentals of Metal Forming, John Wiley & Sons, New York.
Hill,  R., 1948, “A Theory of the Yielding and Plastic Flow of Anisotropic Metals,” Proc. R. Soc. London, Ser. A, 193, pp. 281–297.
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MNC handbook nr 12, 1983, Aluminum Konstruktions-och materiallära, Minab/Gotab, Kungälv.
Carlsson, B., 1996, “Determination and Modeling of Anisotropy With Special Focus on Flat Rolling of Wire,” Doctoral thesis, Kungliga Teknisa Högskolan, Stockholm.
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Figures

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Specimens’ location (to obtain stress ratios for Hill’s criterion)
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Effective stress-strain curves of the annealed aluminum A6082 in different directions: C=Compression;T=Tension.
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Ring rotated (a) 90 deg and (b) 0 deg to the axis of anisotropy; (c) rotation of coordinates.
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At μ=0.027 deformed ring shapes in Case 1. (Pattern 1 of material-ring-flow plus Pattern 1 of friction-ring-flow.)
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At μ=0.027, distribution of (a) frictional shear stress, and (b) normal pressure in the directions of θ(ring90)=90 deg, 0 deg on the ring surface in Case 1
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At μ=0.2, deformed ring shape in Case 1. (Pattern 1 of material-ring-flow plus Pattern 2 of friction-ring-flow.)
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At μ=0.2, distribution of (a) frictional shear stress, and (b) normal pressure in the directions of θ(ring90)=90 deg, 0 deg on the ring surface in Case 1
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Final shapes of rings (90 deg orientation) under the different friction conditions. The black lines stand for the axis of the original extruded round bar for the aluminum alloy AA6082.
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Deformed isotropic ring under different frictional anisotropy conditions. (Pattern 2 of “friction-ring-flow” in 0 deg direction, Pattern 1 of “friction-ring-flow” in 90 deg direction.)
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Distribution of (a) frictional shear stress, and (b) normal pressure in the directions of θ(ring)=90 deg, 0 deg on the ring surface under frictional anisotropy condition
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Influence of frictional anisotropy (μ1=dry condition and μ2=Teflon) on ring deformation. Ring flow is Pattern 2 of “friction-ring-flow” in the area under dry condition, while it is Pattern 1 of “friction-ring-flow” in the Teflon area.
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Deformed ring shape in Case 3
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Changes in internal diameter versus the reduction in height for different materials under different friction conditions. (Pattern 2 of “material-ring-flow” and two patterns of “friction-ring-flow.”)
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Distribution of (a) normal pressure and (b) frictional shear stress; and (c) internal and external surfaces of rings for materials AISI201 at μ=0.1 and isotropy (AISI201) at μ=0.1, 0.18.

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