Turning-Induced Residual Stresses in CoCr28Mo6 Dual Modular Hip Endoprostheses

Abstract To enhance patient care, it is necessary to increase the lifetime of double modular hip endoprostheses with tapered junctions. One approach to increasing the lifetime of components is to adjust the residual stress state to the load. Therefore, this study investigates the influence of process parameters and the effect of their interaction on the residual stresses of neck adapters manufactured from CoCr28Mo6. With the investigated process parameters, compressive residual stresses are present after turning. This study reveals the interaction and issues between surface roughness and the high bending of the surface due to the small radius of the samples in the measurement of residual stress.