Deep Rolling of Titanium Rods for Application in Total Hip Arthroplasty

Author:  Eigenmann, Holzwarth, Kachler, G
Source:  Conf Proc: ICSP-9 (pg 314-319)
Doc ID:  2005103
Year of Publication:  2005
Abstract:  
ABSTRACT Compressive residual stresses are commonly introduced into the near-surface regions of morse taper junctions of modular hip endoprostheses in order to reduce the sensitivity to effects of corrosion, fretting fatigue, and fatigue. The aim of this study is to evaluate the effects of deep rolling rods of titanium alloy TiAl6Nb7 and evaluate the resulting surface characteristics in comparison with those obtained by commonly applied shot peening procedures. For this purpose, TiAl6Nb7 rods with a diameter of 15 mm were deep rolled with balls of different diameters and different rolling parameters. The resulting surface topography and residual contamination was analyzed using a field emission scanning electron microscope. The near-surface residual stress states after deep rolling were characterized by means of X-ray diffraction. The findings are discussed with respect to application of deep rolling as finishing process of morse taper junctions of modular hip endoprostheses.