Vol.10, No2, 2010, pp.161-164
UDC  669.295,  615.46 : 616.314

STRUCTURAL INTEGRITY ASSESSMENT OF HIP IMPLANT MADE OF COBALT-CHROMIUM MULTIPHASE ALLOY

A. Sedmak1, K. Čolić2, Z. Burzić3, S. Tadić2

1) University of Belgrade, Faculty of Mechanical Engineering, Serbia

2) University of Belgrade, Faculty of Mechanical Engng., Innovation Centre, Serbia

3) Military Technical Institute, Belgrade, Serbia

Abstract

This paper presents an analysis from a fracture mechanical perspective of Co-Cr multiphase alloy materials that are used in total hip replacement implants. Design parameters to be considered for hip implants should be related to fatigue and fracture. This paper addresses the elastic-plastic fracture behaviour of commercially cold-drawn (53%) MP35N (35% Co, 35% Ni, 20% Cr, and 10% Mo). In this course, MP35N fracture behaviour has been investigated both under static loading conditions (J-R curve and JIc testing according to ASTM E1737) and under impact loading on Charpy instrumented pendulum. An attempt has been made to correlate JIc values with previously obtained KIc values. Another important task was to investigate the correlation between KVtotal and KIc and between KVgrowth and JId. These results indicate good mutual agreement and possible actions toward further increase of toughness.

Keywords: fracture mechanics parameters, Co-Cr multiphase alloy, hip implants

full article (467 kB)