Stress Analysis of the Adhesive Used in a Hard Disk Drive Bearing Assembly Using Finite Element Model

Abstract:

The objective of this work is to determine the strength of the adhesive injected into the gap between the bearing and actuator arm surfaces under changes of nozzle position on the X and Y axis from the reference position using a finite element model. In this study, maximum stress and maximum shearing stress are used to indicate the adhesive strength. The minimum safety factor then is calculated to show the ratio of the yield strength to the maximum strength. The volume fraction is used to estimate the amount of adhesive on both parts of the bearing assembly. The result show, the maximum stress and strain peak for the case (0.25, 0.2) mm, σ_max= 554.4 MPa, τ_max= 319.6 MPa and Sf_min= 0.10. Setting the nozzle position to coordinates (0.2, 0.3) mm gave the lowest stress, σ_max= 69.0 MPa, τ_max= 39.2 MPa and Sf_min= 0.63. The nozzle position significantly affects the adhesive strength. If the nozzle is moved closer to the actuator arm, the stress distribution is better than placing the nozzle near the bearing. Therefore the suitable position for injection is (0.20, 0.30) mm, while the worst poor position is (0.25, 0.2) mm.

• Periodical: Advanced Materials Research (Volumes 605-607)
• Pages: 405-410
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.605-607.405
• Online since: December 2012
• Authors: Ponthep Vengsungnle, Kiatfa Tangchaichit
• Keywords: Adhesive Bounding, Finite Element, Hard Disk Drive, Stress, Volume Fraction

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