Modifying surface chemistry and/or surface topography is considered to be a traditional way of optimizing bone-implant integration (osseointegration) for improved bone bonding. The previous results have shown enhanced in vitro osteoblast cell density on titania nanotube–covered surfaces compared with bare titanium surfaces. However, for titania nanotubes to be considered as a candidate surface modification for titanium implants, they must survive load-bearing conditions. The authors investigated the structural survivability of nanotubes on the surface of Ti-6Al-4V-ELI (extra low interstitials) cancellous bone screws subjected to insertion and removal using bone simulant. Measuring the torque during insertion in bone simulant was performed to provide input loads to a finite element model to predict the survivability of the titania nanotubes. Scanning electron microscopy was used to investigate the nanotube morphology before and after the insertion and removal tests. A finite element model using experimental insertion torque data estimated the maximum von-Mises stress in the titanium oxide nanotubes. The model predicted that the maximum von-Mises stress in the nanotubes due to combined compression and shear loading is well below the yield failure. Scanning electron microscopy observation confirmed the presence and survivability of the nanotubes after being subjected to multiple insertions and removals of the screws.
Michigan Technological University with a Report option. His report was on the computational study of a non-cylindrical, non-comformable CNG tank mounting on a pickup truck frame using finite element methods. He is currently serving as a Graduate Teaching Assistant under Dr. Aneet Narendranath for a senior level introductory finite element method course. The major duties as an assistant involve guiding senior students in gaining computational knowledge of the applications of the finite element methods in solving simple engineering problems. Using Finite Element Methods to Calculate the deflection of an orifice plate subject to uniform pressure distribution Mr AbstractAs part of an elective course in Finite Element Methods (FEM) for senior level and graduate students in mechanical engineering, an ASME standard for flow measurement devices is used to design an orifice plate. Students are given a certain set of flow condition and equipment constraints that they must adhere to. As part of the design process, they are required to evaluate their orifice plate for strength via finite element methods and determine if the plate's transverse deflections due to uniformly distributed pressure are within set limits.To design the orifice plate, a symbolic solver (Wolfram Mathematica) is used to solve the governing fourth order differential equation of this problem (plate equation in polar coordinates), with appropriate boundary conditions. Results from the symbolic solver are juxtaposed with results from a GUI/Menu driven FEM package (Altair Hyperworks suite). Both the symbolic and menu driven solutions are compared with each other and with published relationships.Governing equations for bending of plates, in polar coordinates (for the orifice plate) have the need to resolve mathematical singularities for "1/r", for "r=0" type terms. This when reconciled using symbolic solvers allows a better grasp of the esoteric inter-relationships between various terms in the governing equations, which are akin to design variables. This allows students to use this esoteric knowledge to better apply GUI/menu driven solvers for engineering design.The primary pedagogical goal of this work allows the exertion of importance of governing equation based modeling to improve a "behind the scenes" understanding of GUI/menu driven FEM efforts. Students are made aware of the use of engineering standards and validation of numerical solutions based on numerical accuracy and convergence of solution through comparison with analytical data.
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