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Research Papers: Contact Mechanics

Transient Thermomechanical Contact of an Impacting Sphere on a Moving Flat

[+] Author and Article Information
A. Ovcharenko

Center for Magnetic Recording Research,  University of California San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0401;Western Digital Corporation, San Jose, CA 92630-7741andreyo78@gmail.comWestern Digital Corporation, San Jose, CA 92630-7741andreyo78@gmail.com

M. Yang, K. Chun

Center for Magnetic Recording Research,  University of California San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0401;Western Digital Corporation, San Jose, CA 92630-7741Western Digital Corporation, San Jose, CA 92630-7741

F. E. Talke

Center for Magnetic Recording Research,  University of California San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0401

1

Corresponding author.

J. Tribol 133(3), 031404 (Jul 25, 2011) (9 pages) doi:10.1115/1.4003996 History: Received May 01, 2010; Revised March 18, 2011; Published July 25, 2011; Online July 25, 2011

Contact between a slider and a magnetic recording disk is modeled as transient contact of a sphere on a moving flat. The sphere is assumed to be rigid, and the flat is treated as an elastic-plastic body with isotropic hardening. Heat generation is related to friction at the contact interface. Dimensionless solutions are obtained for maximum temperature rise, maximum contact force, maximum contact area, and maximum penetration as a function of dimensionless vertical initial velocity of the sphere. It is observed that transient thermomechanical contact with elastic-plastic deformation deviates from “classical theories” for dynamic elastic and quasi-static elastic-plastic contacts as the dimensionless vertical initial velocity of the sphere increases. The results are applied to optimize the slider-disk interface in a hard disk drive with respect to slider-disk contacts.

Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of transient contact between an impacting rigid sphere and a moving deformable flat

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Figure 2

Finite element model of sphere-flat transient contact

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Figure 3

Dimensionless vertical velocity VY /Vy_c and dimensionless contact area A/Ac as a function of dimensionless time t/tc (Pemax = 0.32, Vy /Vy_c = 157.3, Ef /Yf = 106, ν = 0.33, and μ = 0.3)

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Figure 4

Dimensionless vertical displacement y/ωc of sphere and flat as a function of dimensionless time t/tc (Pemax = 0.32, Vy /Vy_c = 157.3, Ef /Yf = 106, ν = 0.33, and μ = 0.3)

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Figure 5

Plastic strain at dimensionless time t/tc = 0.22 corresponding to maximum sphere penetration (Pemax = 0.32, Vy /Vy_c = 157.3, Ef /Yf = 106, ν = 0.33, and μ = 0.3)

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Figure 6

Dimensionless contact force P/Pc and dimensionless friction force Q/Pc as a function of dimensionless time t/tc (Pemax = 0.32, Vy /Vy_c = 157.3, Ef /Yf = 106, ν = 0.33, and μ = 0.3)

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Figure 7

Normalized mean contact pressure p/Y and total friction coefficient μtot as a function of dimensionless time t/tc (Pemax = 0.32, Vy /Vy_c = 157.3, Ef /Yf = 106, ν = 0.33, and μ = 0.3)

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Figure 8

Dimensionless temperature rise ΔTTmax_c for sphere and flat as a function of dimensionless time t/tc (Pemax = 0.32, Vy /Vy_c = 157.3, Ef /Yf = 106, ν = 0.33, and μ = 0.3)

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Figure 9

Locations of maximum temperature at the contact interface at dimensionless time t/tc = 0.03 (a) and 0.29 (b) (Pemax = 0.32, Vy /Vy_c = 157.3, Ef /Yf = 106, ν = 0.33, and μ = 0.3)

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Figure 10

Dimensionless maximum temperature rise as a function of dimensionless vertical initial velocity

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Figure 11

Dimensionless maximum contact force as a function of dimensionless vertical initial velocity

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Figure 12

Dimensionless maximum contact area as a function of dimensionless vertical initial velocity

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Figure 13

Dimensionless maximum penetration as a function of dimensionless vertical initial velocity

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Figure 14

Dimensionless maximum residual penetration as a function of dimensionless vertical initial velocity

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Figure 15

Maximum residual penetration as a function of maximum penetration

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Figure 16

Dimensionless maximum contact force as a function of dimensionless maximum penetration

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Figure 17

Dimensionless maximum contact area as a function of dimensionless maximum penetration

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