Affiliations: Department of Mechanical Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, India | Department of Mechanical Engineering, University of Texas at San Antonio, San Antonio, TX, USA
Note: [] Address for correspondence: Satya Prasad Paruchuru, Department of Mechanical Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Vignana Jyothi Nagar, Bachupally, NizamPet (S.O.), Hyderabad 500090, India. Tel.: +91 40 2304 2758, Ext. 431; Fax: +91 40 2304 2761; E-mail: paruchuru1@yahoo.co.in.
Abstract: Quality of bone tissue deteriorates with age and disease. Mechanical techniques that evaluate properties of cadaver bone help in understanding mechanisms behind aging and disease and by extension, in the quality assurance of engineered bone tissue like bone grafts. Use of inverse engineering techniques help in interpreting bone properties from experimental data. A damage plastic model that considers damage accumulation during post yield was proposed in order to represent bone in finite element simulations. Finite element simulation of nanoindentation test was carried out using the damage plastic model and perfect plastic model. Comparison of the results of simulation with experimental nanoindentation data concluded that the damage plastic model is a realistic representation of cortical bone. This model was successfully utilized to inverse engineer the experimental nanoindentation data for assessing the Elastic Modulus and Yield Stress of cortical bone. Thus in situ properties of bone were interpreted from the minimally destructive technique.
Keywords: New methods, in situ bone properties, post yield behavior, finite element simulation, nanoindentation test, damage plastic model
