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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

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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