Material optimization for femur bone implants based on vibration analysis

Abstract

The aim of this study is to carry out vibration analysis based on finite element technique. Both end fix and both end free conditions are taken as boundary conditions. Three-dimensional CAD model of femur bone is created using MRI and CT-Scan data by utilizing ITK-Snap freeware. Vibration pattern for first six modes were studied on ANSYS 19. Two materials, magnesium alloy (AZ31) and Commercially Pure Titanium alloy (CP Ti) along with natural bone are considered for analysis. The mode shapes show that the natural frequency of AZ31 is closer to the natural frequency of natural bone than that of CP Ti. Moreover, weight of natural bone is 1.28 Kgs, that of AZ31 is 1.14 and of CP Ti is 2.89 Kgs. AZ31 is lighter than natural bone and can be concluded as best suited material for artificial bone implants rather than CP Ti. Biomechanical analysis of AZ31 femur implant is carried out for daily life activities such as standing, walking and jumping. Femur head is kept fixed whereas loading is done at knee joint. The maximum stress and maximum deformation generated for standing, walking and jumping condition are 36.4 MPa, 38.7 MPa and 43.9 MPa and 0.296 mm, 0.316 mm and 0.357 mm respectively.