Finite Element Stress Analysis Of Artificial Femur Head On Hip Joint Prosthesis

Finite Element Stress Analysis on Artificial Femur Head of Hip Joint ProsthesisrnYigezu BantirgarnAddis Ababa Institute of Technology, 2013rnCobalt-chromium-molybdenum ball heads for total hip replacement are highly loaded in finite element load step on the basis of ISO 5832-12 rupture test to meet the stress requirements concerning strength and safety. High stresses inside the ball head originate from the press fit between the conical stem neck (made of titanium alloy) and the borehole of the ball. The aim of this study was the development of an optimized contour at the fillet inside the ball head and the borehole contact length depth by means of numerical methods, in order to reduce local stress concentrations. The finite element optimization method was applied on the customary engineering fillet radius to reduce local stress peaks. Since the static load from experimental realistic hip implant test is governed by the maximum von-mises, shear, normal and principal stresses in the contact area of the taper. The optimal reduced local stress of the examined ball head design was obtained in the medium neck contact length at o.8mm fillet for the relevant realistic load case of stumbling.rnKeywords: Femoral head, Stem neck, Optimum geometry, Stress concentration, FEA

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