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    Optimization of Porosity Distribution in Functionally Graded Porous Shape Memory Alloy Beams Using Genethic Algorithm

    , M.Sc. Thesis Sharif University of Technology Jamshidi, Mohammad Amin (Author) ; Arghavani Hadi, Jamal (Supervisor)
    Shape Memory alloys are a kind of intelligent materials developed in recent years due to their comprehensive use in medical, robotics, and other advanced sciences. Two main characteristics of them are shape memory effect and superelasticity put these materials in the category of advanced materials. Recently, the new branch of them attracted many studies which is the porous shape memory alloys. The importance of this class of material is related to their properties such as bio-compatibility, superelasticity and shape memory effect. Since shape memory alloys are usually expensive, a new field is developed known as functionally graded porosity distribution. This method is performed by... 

    Fabrication of porous NiTi-shape memory alloy objects by partially hydrided titanium powder for biomedical applications

    , Article Materials and Design ; Volume 30, Issue 10 , 2009 , Pages 4483-4487 ; 02641275 (ISSN) Sadrnezhaad, S. K ; Hosseini, S. A ; Sharif University of Technology
    Porous NiTi-shape memory alloy (SMA) is a promising biomaterial with desirable mechanical property and appropriate biocompatibility for human implant manufacturing. In this research, porous NiTi-SMAs have been successfully produced by using thermohydrogen process (THP). This process has capability of production of homogenous structures, appropriate pore-size distributions and short sintering times. The THP-SMA samples produced in this research have a low Young's modulus (19.8 GPa) and a high tensile strength of 255 MPa. These properties are close to those of the natural bone and can meet the mechanical property demands of the hard-tissue implants for heavy load-bearing applications. The... 

    Prediction of shape and internal structure of the proximal femur using a modified level set method for structural topology optimisation

    , Article Computer Methods in Biomechanics and Biomedical Engineering ; Volume 15, Issue 8 , 2012 , Pages 835-844 ; 10255842 (ISSN) Bahari, M. K ; Farahmand, F ; Rouhi, G ; Movahhedy, M. R ; Sharif University of Technology
    A computational framework was developed to simulate the bone remodelling process as a structural topology optimisation problem. The mathematical formulation of the Level Set technique was extended and then implemented into a coronal plane model of the proximal femur to simulate the remodelling of internal structure and external geometry of bone into the optimal state. Results indicated that the proposed approach could reasonably mimic the major geometrical and material features of the natural bone. Simulation of the internal bone remodelling on the typical gross shape of the proximal femur, resulted in a density distribution pattern with good consistency with that of the natural bone. When...