Abstract
A numerical analysis method for elastic contact mechanics between a spherical slider and a flat disk with a sub-nanometer roughness is presented by taking account of Lennard-Jones(LJ) surface forces. In contrast to conventional theories, the elastic deformations and LJ surface forces of both mean surfaces and contacting asperities are taken into account. Calculated results for 2-mm radius glass slider are shown and compared with experimental dynamic indentation characteristics. Convergent solutions obtained by a simple under-relaxation iteration method are shown for low roughness contacts with sub-nanometer mean surface distance and asperity height of 2-mm radius glass slider and 20-mm radius head slider contacting with a magnetic disk. It is found that the increase in adhesion force with a decrease in mean surface distance can be suppressed by deceasing asperity radius and increasing asperity density and Young's modulus.
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