Four Mechanical Engineering students presented their research in the 2013 URCAD on April 24.
"Characterization of Carbon Nano-Structure Infused Fiber Reinforcements on Glass Substrates" - Matthew Buchanan, Dr. Marc ZupanThe transition of laboratory processing to production volume often precludes new material insertion. Carbon based nano-structures (CNS) show great promise in becoming a disruptive material technology; however, currently their use is limited because they cannot be manufactured in large quantities. This research focuses on a scalable production method to grow CNS on to substrates as an end material system or for harvesting. A novel, open-ended growth chamber and reel-to-reel scalable chemical vapor deposition (CVD) processing system was used for the growth of carbon nano-structures directly on moving glass fiber substrates. Our group conducted research on as-received and CNS-infused glass fiber filaments utilizing single-fiber fragmentation (SFF) tests. The shape and size of the birefringence patterns were used to describe how fiber behavior changed with processing. Post-mortem measurements of the critical fiber fragment lengths were used to identify the quality of the interfacial load transfer. A new material selection performance metric based on the critical aspect ratio was established to evaluate the hybrid interface (fiber-CNS-matrix) response. The results gathered suggest that the presence of CNS increase interfacial load transfer. These results will be used in optimizing the novel open-ended growth chamber during scale up of CNS growth production.
This work was funded, in part, by the UMBC Office of Undergraduate Education through an Undergraduate Research Award, and Applied Nanostructured Solutions LLC, Baltimore, MD for the supply of fibers and CNS growth.
"Modeling Nanoparticle Heat Transfer in Tumors" - Korine Duval, Alex Lebrun, Anil Attaluri, Dr. Liang ZhuNanoparticle infusion is a rapidly growing cancer treatment research thrust. When placed in an alternating magnetic field, specialized nanoparticles have the unique ability to generate thermal energy. As elevated temperatures effectively kill cancer cells, the non-invasive heating capability of these nanoparticles provides a promising pathway for a controlled localized treatment of this disease. In this multidisciplinary effort, a predictive mechanism for the potency and overall behavior of this treatment is invaluable. Accordingly, in this work images from a Micro-CT scanner of nanoparticle injected mouse tumors are virtually reconstructed and tested. For this early stage, focus has been given to accurately reconstructing the tumor and nanoparticles in COMSOL® Multiphysics then assigning appropriate material properties. Preliminary results determined by direct comparison to the CT images reveal that a tumor has been successfully reconstructed. Also, corresponding SAR distributions have been determined from raw Micro-CT data, allowing for initial heat transfer analysis. Results from preliminary studies reveal that temperatures within the tumor surpassed steady state by 10-15 degrees Celsius.
This work was funded, in part, by NIH/NIGMS MARC U*STAR T34 08663 National Research Service Award to UMBC and by the National Institutes of Health (NIH) [1K22CA143148 to M.G.K. (PI); R01LM009722 to M.G.K.(collaborator)].
"Parametric Study of a Precise Heating and Cooling Technology Applicable to Microchannel Flow" - Joshua Hooks, Dr. Tony Farquhar
"Local Mechanical Behavior Measurements of Friction Stir Welded Titanium" - Christopher Paymon, Dr. Marc Zupan
Friction stir welding (FSW) is a novel alternative, fusion, welding technique that offers many advantages over current methods including reduced cost, waste, and possible improved performance. This research used direct micro-sample testing, to link local microstructure and localized texture to mechanical properties of FSW titanium with nickel tracking foil. The nickel foil is used to reduce wear on the tool pin, decrease forging force, and to map the complex flow within the stir zone. This was achieved by making direct measurements of the unprocessed base metal and stir zone mechanical properties using micro-scale tensile tests. The local mechanical properties throughout the stir zone, exhibited yield strengths and ultimate tensile strengths within one standard deviation to those of the base metal. This can be attributed to two reasons: High deformation caused by the movement of metal around the tool pin, and high temperatures caused by friction heating of the tool and metal. The strain to failure inside the stir zone showed a fourteen percent decrease than that of the base metal. Scanning electron microscope images were used to visually inspect the fracture surface of the deformed specimens. These observations showed that the material exhibited ductile fracture behavior at the weld center and reduced ductility at the weld interface. These results show that the use of a nickel foil in FSW titanium plates resulted in no reduction in strength while the material became less ductile away from the weld center. These results are important to improving process parameters in FSW as well as providing basic design data.
This work was funded in part by an Undergraduate Research Award from the UMBC Office of Undergraduate Education and by the Office of Naval Research.