EFECTS OF ELEMENT FORMULATIONS OF 8-NODED HEXAHEDRON ELEMENT ON HDD DYNAMICS UNDER SHOCK IMPULSE

【Author】

Arief Yudhanto;Ong Eng Teo;Ong Eng Hong;

【Abstract】

<正>In the finite element modeling of hard disk drive(HDD),components such as disk,actuator arm or base casting may be modeled using solid element.The 8- noded hexahedron element is often the preferred choice due to its low computational cost compared to its counterpart such as 20-noded hexahedron.When transient analysis is performed,i.e.shock simulation,HDD component assembled with 8- noded hex may behave differently depending on the element formulation used. Although element formulation may not be a big issue to the general FEM users, however,it may give unexpected response pertaining to HDD dynamics.This paper presents numerical studies on the effect of using different element formulations for 8- noded hexahedron element in the HDD shock simulations.The Hitachi 1.8 inch HDD components were used in this study.Two components,namely disk and actuator arm,were built using 8-node hexahedral element.Shock impulse of half-sine wave (500G/2ms) was applied to the individual model,while憇mply-supported抌 oundary condition was applied.Two element formulations are studied:selectively-reduced integration(SRI) and full integration(FI).FI is studied using ANSYS solver and SRI is studied using ANSYS/LS-DYNA.Numerical studies show that FI can give converged results with coarse mesh.On the other hand,SRI needs finer mesh before converged results can be attained.Comparison was also made between FI (coarse mesh) and SRI(coarse mesh) in head-suspension-assembly(HSA)-disk model.The model was also subjected to 500G/2ms shock impulse.Flying height modulation of slider during operating condition is plotted.Effects of element formulations on disk-suspension dynamics are discussed.

【Keywords】

hard disk drive;;shock;;finite element method;;hexahedron element;;full integration;;selectively-reduced integration

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  • [1] ANSYS LS-DYNA user guide-ANSYS Release 10.0?,

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