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Current Projects
MRI: Development of a Micro-Optical Sheer Stress Sensor for Fluid Mechanic Research
In this research, a novel micro-optical wall shear stress sensor will be developed for a number of fluid mechanics research projects at Polytechnic University. The micro-optical sensor is based on dielectric micro-beads that are excited by coupling light from an optical fiber. The technology exploits the morphology-dependent shifts in resonant frequencies that are commonly referred to as the whispering gallery modes (WGM). A minute change in the size, shape or optical constants of the micro-bead causes a shift in the resonant frequency (or the WGM). This shift can be related to the stress on the micro-bead. The sensor will provide direct, time-resolved, high-sensitivity, large bandwidth measurement of wall shear stress that is well resolved in space. The project is funded by the National Science Foundation.
Functionally Gradient Syntactic Foams (FGSFs) with high damage absorption capabilities.
FGSFs based on a new microstructure are being developed in this project. These foams contain a gradient of microballoon wall thickness through the material thickness. Initial results are generated on layered materials simulating this kind of structure and testing under compression. Currently, the work is being extended towards modeling these materials for compressive and bending properties. The project was partially supported by Othmer Institute at Polytechnic University though a seed grant.National Science Foundation.
Nanoclay reinforced high performance nanocomposites.
This ongoing study deals with incorporation of nano-sized clay particles in epoxy matrix material for improvement in their mechanical properties. Reliable methods of uniformly dispersing and exfoliating nanoclay in epoxy resins have been developed in the CMML. Extensive processing facilities are available at CMML for fabrication of such nanocomposites. The fabricated nanocomposites are being tested for various mechanical properties. The project also involves modeling the strengthening mechanism of nanoclay in these composites.
Evaluation of defects and mechanical properties of multiphase composite materials through nondestructive ultrasonic technique.
Ultrasonic imaging (UI) technique is one of the most versatile NDE techniques for detection of surface, sub-surface and internal defects in materials. It is possible to relate the ultrasonic properties of materials with their mechanical properties. The ongoing study is focused on developing reliable methods to characterize laminated and particulate composite materials for defects and mechanical properties. Some of the major limitations in these materials is overlapping peaks, high attenuation and multiple internal reflections. The project was started with a seed grant provided by Louisiana Space Consortium at Louisiana State University.
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Completed Projects
Fabrication, Impact Characterization and Damage Tolerance of Syntactic Foams for Aerospace Applications.Louisiana Space Consortium.
Five types of syntactic foams were fabricated in the lab and characterized for high strain rate properties. Specimens were tested at several strain rates between 600 s-1 and 1800 s-1. Interesting set of results was obtained showing increase in strength and modulus of syntactic foams compared to the quasi-static test results. Extensive fractography was carried to determine the fracture mode in all types of specimens.
Development of Non-Destructive Evaluation of adhesive Joints for Aerospace Applications. Louisiana Space Consortium.
The project focused on determining the bond characteristics between carbon fabric laminates bonded with epoxy based adhesive. The bond layer contained various types of defects, which were detected through ultrasonic imaging. The results showed considerable success in identifying and profiling the defects in these complex material systems. The specimens were supplied by Bell Helicopters.
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