Discussion: “Analysis of Stresses Induced by Dynamic Load Head-Disk Contacts” (Fu, Ra-Chang and Bogy, David B., 2000, ASME J. Tribology, 122, No. 1, pp. 233–237)

Abstract

The authors developed a valuable method for estimating the impact stress caused by dynamic load head-disk contacts. Based on existing experimental database, they extrapolated the desired radius of curvature for slider rounding. This approach is useful as it enables to extrapolate parameters from larger form factor slider to smaller form factor one. In practice, the measurement of the motion of smaller form factor slider is usually difficult as the slider is fully covered by suspension. However, the derived stress model as represented by Eqs. (12)–(13) are arguable. By using the equilibrium of energy in the impact deformation process, we obtained the following formulation for the maximum contact stress: Display Formulaσm=C(E*)4/5M1/5V2/5R−3/5,in which C is a numeric value. This formulation is different from the model given by the authors.