Plasticity Index for Contact Between a Head and a Disk With Crater-Shaped Laser Bumps

[+] Author and Article Information
Q. Zhao, F. E. Talke

Center for Magnetic Recording Research, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093

J. Tribol 122(1), 269-273 (Jul 21, 1999) (5 pages) doi:10.1115/1.555353 History: Received March 04, 1999; Revised July 21, 1999
Copyright © 2000 by ASME
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Grahic Jump Location
Schematic of the contact between a semi-sphere and a plane
Grahic Jump Location
AFM picture of a typical crater-shaped laser bump. (a) 3D and (b) cross-section.
Grahic Jump Location
Schematics of contact between a circular cylinder and a plane
Grahic Jump Location
The shape coefficient s versus the composite Young’s modulus/hardness ratio E*/H
Grahic Jump Location
Plasticity index (ψc) versus rim radius (R1) of laser bumps. E*/H is the ratio of the composite Young’s modulus and hardness and σ is the standard deviation of the laser bump height.
Grahic Jump Location
Plasticity indexes for (a) “cylinder-on-plane” contacts and (b) for “sphere-on-plane” contacts as a function of the head/disk separation and the standard deviation of the height of the laser bumps



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