An Asperity Contact Model for the Slider Air Bearing

Huang, Weidong; Bogy, David B.; Honchi, Masayuki

doi:10.1115/1.555379

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…This is also justified since the friction force calculation is valid under both static and dynamic conditions. Lastly, even though the contact force P has been developed for static contact, this force is also valid under sliding conditions, since typical asperities have very small slopes where Hertzian calculations are valid [23].…”

Section: Model Descriptionmentioning

confidence: 99%

Adhesion and Friction Evaluation of Textured Slider Surfaces in Ultra-Low Flying Head-Disk Interfaces

2004

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To achieve extremely high-density magnetic recording of 1 Tbit per square inch using conventional technologies, the distance between the recording slider and the rotating disk needs to be less than 5 nm. For successful operation, disk and slider surfaces must also be extremely smooth with root-mean-square roughness values of few angstroms. However, ultra-low flying super smooth head-disk interfaces may be exposed to a significant amount of intermittent contact, adhesion, stiction and friction that can cause the interface to collapse. In order to circumvent such problems, many novel techniques have been proposed, such as laser zone texturing, contact pads and surface microtexturing. A reliable method to reduce adhesion and friction in ultra-low flying head-disk interfaces is to control the area of contact and roughen the interface, which allows the slider to fly at sub-5 nm with minimal contact. A technique known as preferential texturing provides a unique roughening of the air-bearing surface, where parts of the surface are removed, i.e., subtractive texturing process. In this paper, the effect of preferential texturing (roughening) of slider air-bearing surfaces on the adhesion and friction forces are investigated using quasi-dynamic models. The simulation results show that surface texturing reduces adhesion and friction by reducing the effective area of contact between the slider and media surfaces and by preferentially roughening the interface. The simulation results of friction compare favorably with experimental data.

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Section: Model Descriptionmentioning

confidence: 99%

Adhesion and Friction Evaluation of Textured Slider Surfaces in Ultra-Low Flying Head-Disk Interfaces

2004

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“…The effect of surface roughness, intermolecular and surface forces on the static and dynamic performance of air bearing slider was studied by Bogy et al [4]. Weidong Huang utilized the direct simulation Monte Carlo method to solve single asperity contact problem, and the solution is compared to the numerical solution of the compressive Reynolds equation with the second order slip model [5].…”

Section: Introductionmentioning

confidence: 99%

Surface Topology Optimization of Air Bearing Slider for Wear Durability in Magnetic Hard Disk Drives

Zhao

2011

AMR

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In order to protect the slider and disk from excessive wear, a numerical scheme is proposed for transient dynamics at slider/disk interface with the emphasis on the slider wear mechanism and the surface topology optimization of sub-ambient pressure slider. For each transient flying height and slider attitude, the modified Reynolds lubrication equation is solved by the control volume method to obtain the simultaneous pressure distribution in the slider surface. Then the dynamic flying attitude of the slider subject to the calculated pressure distribution can be solved by the Quasi-Newton iteration method at each time step. On the basis of above work, the optimization of the slider surface topology is implemented, and it’s concluded that slider crown has the most significant impact on the dynamic flying attitude and stability. Finally, a sub-ambient pressure slider is designed, which can effectively avoid the slider wear and severe fault of hard disk drive.

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Predicting the coefficient of restitution of impacting elastic-perfectly plastic spheres

2009

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The current work presents a different methodology for modeling the impact between elastoplastic spheres. Recent finite element results modeling the static deformation of an elasto-plastic sphere are used in conjunction with equations for the variation of kinetic energy to obtain predictions for the coefficient of restitution. A model is also needed to predict the residual deformation of the sphere during rebound, or unloading, of which several are available and compared in this work. The model predicts that a significant amount of energy will be dissipated in the form of plastic deformation such that as the speed at initial impact increases, the coefficient of restitution decreases. This work also derives a new equation for the initial critical speed which causes initial plastic deformation in the sphere that is different than that shown in previously derived equations and is strongly dependant on Poisson's Ratio. For impacts occurring above this speed, the coefficient of restitution will be less than a value of one. This work also compares the predictions between several models that make significantly differ-

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An Asperity Contact Model for the Slider Air Bearing

Cited by 6 publications

References 15 publications

Adhesion and Friction Evaluation of Textured Slider Surfaces in Ultra-Low Flying Head-Disk Interfaces

Adhesion and Friction Evaluation of Textured Slider Surfaces in Ultra-Low Flying Head-Disk Interfaces

Surface Topology Optimization of Air Bearing Slider for Wear Durability in Magnetic Hard Disk Drives

Predicting the coefficient of restitution of impacting elastic-perfectly plastic spheres

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