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TECHNICAL PAPERS

Elastic-Plastic Finite Element Analysis for the Head-Disk Interface With Fractal Topography Description

[+] Author and Article Information
K. Komvopoulos, N. Ye

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Tribol 124(4), 775-784 (Sep 24, 2002) (10 pages) doi:10.1115/1.1467088 History: Received July 05, 2001; Revised October 30, 2001; Online September 24, 2002
Copyright © 2002 by ASME
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References

Figures

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(a) Surface profile equivalent to the head-disk interface truncated by a rigid plane to a maximum global interference δg revealing contact at different regions and (b) profile region between x=3340 nm and x=3540 nm truncated by a rigid plane to a maximum local interference δ used in the finite element simulations
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Finite element mesh of a layered medium with a 10 nm thick overcoat
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Evolution of contact pressure distributions at different regions of the surface profile shown in Fig. 1(a) with increasing surface interference for t=2 nm,E1/E2=0.88, and σY1Y2=2.12
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Contours of (a), (c) von Mises equivalent stress and (b), (d) equivalent plastic strain for δ=0.5 nm, t=2 nm,E1/E2=0.88, and σY1Y2=2.12
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Contours of (a), (c) von Mises equivalent stress and (b), (d) equivalent plastic strain for δ=1 nm, t=2 nm,E1/E2=0.88, and σY1Y2=2.12
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Contours of (a), (c) von Mises equivalent stress and (b), (d) equivalent plastic strain for δ=2 nm, t=2 nm,E1/E2=0.88, and σY1Y2=2.12
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Contours of (a), (c) von Mises equivalent stress and (b), (d) equivalent plastic strain for δ=2 nm, t=5 nm,E1/E2=0.88, and σY1Y2=2.12
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Contours of (a), (c) von Mises equivalent stress and (b), (d) equivalent plastic strain for δ=2 nm, t=10 nm,E1/E2=0.88, and σY1Y2=2.12
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Variation of (a) maximum von Mises equivalent stress, σ̄Mmax, (b) maximum equivalent plastic strain, ε̄pmax, and (c) maximum first principal stress, σ1max, with maximum local surface interference δ in the overcoat medium for t=2, 5, and 10 nm, E1/E2=0.88, and σY1Y2=2.12. (Stress results have been normalized by the yield strength of the overcoat, σY1.)
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Variation of (a) maximum von Mises equivalent stress, σ̄Mmax, (b) maximum equivalent plastic strain, ε̄pmax, and (c) maximum first principal stress, σ1max, with maximum local surface interference δ in the magnetic layer medium for t=2, 5, and 10 nm, E1/E2=0.88, and σY1Y2=2.12. (Stress results have been normalized by the yield strength of the magnetic layer, σY2.)
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Contours of (a), (c) von Mises equivalent stress and (b), (d) equivalent plastic strain for δ=2 nm, t=5 nm,E1/E2=1.29, and σY1Y2=4.87
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Variation of (a) maximum von Mises equivalent stress, σ̄Mmax, (b) maximum equivalent plastic strain, ε̄pmax, and (c) maximum first principal stress, σ1max, with maximum local surface interference δ in the overcoat and magnetic layer media for t=5 nm, β=2.1 (E1/E2=0.88,σY1Y2=2.1), and β=4.9 (E1/E2=1.29,σY1Y2=4.87). (Stress results have been normalized by the yield strength of each material, σY.)
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Contours of von Mises equivalent stress for δ=2 nm, t=10 nm,E1/E2=0.88,σY1Y2=2.12, and σR=−2 GPa
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Variation of (a) maximum von Mises equivalent stress, σ̄Mmax, (b) maximum equivalent plastic strain, ε̄pmax, and (c) maximum first principal stress, σ1max, with maximum local surface interference δ in the overcoat medium for t=10 nm,E1/E2=0.88,σY1Y2=2.12, and σR=0, −1, −2, and −4 GPa. (Stress results have been normalized by the yield strength of the overcoat, σY1.)
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Variation of (a) maximum von Mises equivalent stress, σ̄Mmax, (b) maximum equivalent plastic strain, ε̄pmax, and (c) maximum first principal stress, σ1max, with maximum local surface interference δ in the magnetic layer medium for t=10 nm,E1/E2=0.88,σY1Y2=2.12, and σR=0, −1, −2, and −4 GPa. (Stress results have been normalized by the yield strength of the magnetic layer, σY2.)

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