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Study on the Fretting Wear Dynamics and the State of Third-body Wear for Dimple of Hard Disk Suspension

Author: GuoZhiGuang
Tutor: WangWuYi
School: Harbin Institute of Technology
Course: Aviation Aerospace Manufacturing Engineering
Keywords: Drive head Dens Impact Wear and tear Kinetic studies
CLC: TH117.1
Type: Master's thesis
Year: 2010
Downloads: 37
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Abstract

Hard at work / non-working condition, due to their own works and subject to external shocks or vibration, dens and flex arm suspension tongue will produce tiny plastic deformation or displacement of sliding, the long-term existence of such alternating deformation or relative slip shift will make dens and tongue to fretting fatigue and fretting wear, wear debris generated will pollute the disk, causing disc read errors and physical damage and even entire hard drive failure. Dens with the tongue against fretting this problem, this paper established a solid model of the hard drive, using the finite element method to study hard in external shocks or vibration when the wear of the tongue and dens; and established dens and tongue The three-body wear model to study the wear debris is generated outside the dens and tongue load on the implications for research dens and tongue fretting fatigue and fretting wear mechanisms and control methods provide the basis for dens for the optimal design with tongue has a certain significance. Established using the Solidworks 3D solid model of the head assembly, and then imported into HyperMesh pre-processing software, the model was repaired, optimization and extraction in the face, meshing, boundary conditions created pre-treatment. Studied hard at work / non-working state, a single half-sine acceleration pulse pulse amplitude and pulse width on the tongue and dens wear were studied: pulse amplitude greater separation of the tongue and the relative displacement of dens larger tongue and micro-slip and wear dens more serious; pulse width greater dens and the greater the relative displacement of the tongue, but the magnitude is not large shift changes. Simulated Hard at work / non-working condition, sine acceleration excitation amplitude and frequency on the tongue and dens wear effects: the greater the amplitude of the sine acceleration excitation, the relative displacement of the tongue and dens greater wear and tear is more serious; sinusoidal acceleration excitation The frequency and the natural frequency of the hard drive closer, tongue and the relative displacement of dens and wear is also greater. By comparing Hard at work / non-working state when subjected to external shock and vibration relative displacement of the tongue and dens, obtained gas buoyancy effects on the hard drive vibration resistance. And analyzed the dens and tongue elastic modulus and Poisson's ratio for dens and tongue influence. Established contact with the elastic contact and plastic dens under the tongue fretting with a third body model, obtained through theoretical derivation under external loads, dens, and the distance between the tip of the tongue, and the third body under elastic contact with the dens and tongue The total contact area and dens under plastic in contact with the tongue and the total volume of plastic deformation between the external load: dens and the distance between the tip of the tongue with the external load decreases with an increase; dens under elastic contact with the tongue and the third body The total contact area is almost directly proportional to the external load; dens under plastic in contact with the tongue of the total volume of plastic deformation is almost proportional to the external load and.

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