EXPERIMENTAL ANALYSIS OF FRACTURE BEHAVIOUR OF STAINLESS STEEL USED FOR BIOMEDICAL APPLICATIONS
Katarina Čolić1, Aleksandar Sedmak2, Nenad Gubeljak3, Meri Burzić1, Sanja Petronić1
University of Belgrade, Innovation Center of the Faculty of Mech. Engng, Belgrade, Serbia,
University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia
University of Maribor, Faculty of Mechanical Engineering, Maribor, Slovenia
This paper presents an analysis of stainless steel materials that are used as biomaterials in biomedical applications, such as artificial joint implants, from a fracture mechanical perspective. Design parameters that should be considered for artificial implants are fatigue and fracture. Therefore, it is necessary to understand the fatigue crack initiation and propagation characteristics in order to prevent catastrophic failure of the implant. The fracture behaviour of 316L stainless steel is investigated by means of standard fracture mechanics tests performed on modified CT specimens. The GOM optical system and Aramis software are used to perform 3D experimental optical analysis of the specimens. The possibilities of using this method for analysing materials for biomedical applications are discussed. The experimental study consists of evaluation of elastic-plastic fracture behaviour of 316L stainless steel, and determining KI values. The major strain fields of the stainless steel specimen for crack tip opening and fracture are presented. The results indicate that this new optical stereometric measuring methodology is giving good results in investigations of fracture behaviour of bimetallic materials.
fracture behaviour, stainless steel, optical stereometric measuring system, stress intensity factor, biomedical applications