Experimental investigation and analysis of human femur Implant in hemiarthroplasty for equivalent stress during walking and stumbling conditions for PEEK, CFR-PEEK and Ti-6Al-4V materials

Abstract

The fatigue and wear analysis of femur implant in hip hemiarthroplasty plays substantial role in estimating the life of implant and in selection of idea material. This study comprises modeling and finite element analysis of femur head, which is utilized in hip hemiarthroplasty. The materials utilized in analysis are polyether-ether-ketone (PEEK), carbon-fiber-reinforced polyether-ether-ketone (CFR-PEEK) and titanium alloy (Ti-6Al-4V), the dynamic loading under the human activities as walking barefoot, stumbling. The FEA was performed in ANSYS Workbench 19.2 and modeling was carried out on SolidWorks 2021. The S-N curves were utilized for the fatigue life estimation and modified Archard’s law was utilized for accounting the wear depth per year. The result obtained from FEA were equivalent stress, contact pressure and sliding distance for all materials and activities. After observing the results, it is concluded that the CFR PEEK is ideal for the femur head under all activities and the higher stresses and contact pressures were generated under stumbling activity. The approximated life of the CFR PEEK material femur head was 10 years, after that it is required to be changed or replaced for smooth functionality.