A5020636522- High-Temperature Coating Behaviors
- Advanced ceramic materials synthesis
- Nuclear Materials and Properties
- Metal and Thin Film Mechanics
- Thermography and Photoacoustic Techniques
- Catalytic Processes in Materials Science
- Additive Manufacturing and 3D Printing Technologies
- Ultrasonics and Acoustic Wave Propagation
- Carbon Nanotubes in Composites
- Additive Manufacturing Materials and Processes
- Advanced materials and composites
- Luminescence Properties of Advanced Materials
- High Temperature Alloys and Creep
- Non-Destructive Testing Techniques
- Diamond and Carbon-based Materials Research
- Welding Techniques and Residual Stresses
- Tribology and Wear Analysis
- Smart Materials for Construction
- Mechanical Behavior of Composites
- Polymer Nanocomposites and Properties
- Aluminum Alloy Microstructure Properties
- High Entropy Alloys Studies
- Fiber-reinforced polymer composites
- Advanced MEMS and NEMS Technologies
- Bone Tissue Engineering Materials
Embry–Riddle Aeronautical University
2024
University of Central Florida
2014-2023
American Institute of Aeronautics and Astronautics
2023
Purdue University West Lafayette
2009
Bhabha Atomic Research Centre
1999
Calibration of high spatial resolution stress-sensing alumina-epoxy nanomaterials is presented. The piezospectroscopic property luminescent chromium-doped alumina nanoparticles embedded as "nano-sensors" in epoxy-based materials the basis for stress sensing capabilities. stress-optical properties are determined piezopectroscopic coefficients compression experiments containing varying volume fractions nanoparticles. An increasing stress-sensitivity was demonstrated with higher fractions....
The advancement in spectral analysis methods for the emission spectrum of ruby has been driven by characterization R-line peak shifts with stress order to establish piezospectroscopic relationships. These relationships form basis development photo-stimulated luminescence spectroscopy (PSLS) as a nondestructive method determine integrity thermally grown oxide (TGO) layer on jet engine turbine blades. Besides measurement technique, accuracy PSLS measurements is influenced methodology, which...
The use of carbon nanotubes in composite hard armor is discussed this study. processing techniques to make various panels consisting Kevlar®29 woven fabric an epoxy matrix and the subsequent V50 test results for both 44 caliber soft-point rounds 30 FSP (fragment simulated projectile) threats are presented. A 6.5% improvement was found a combination 1.65 wt% loading milled fibers. failure mechanism during ballistic event through scanning electron microscope images after failure. Raman...
Measurement techniques to obtain accurate in situ synchrotron strain measurements of thermal barrier coating systems (TBCs) applied hollow cylindrical specimens are presented this work. The Electron Beam Physical Vapor Deposition coated with internal cooling were designed achieve realistic temperature gradients over the TBC material such as that occurring turbine blades aeroengines. Effects circular cross section on x-ray diffraction (XRD) various layers, including thermally grown oxide,...
Through the piezospectroscopic effect, certain photo-luminescent materials, once excited with a laser, produce spectral emissions which are sensitive to stress or strain that material experiences. A system utilizes effect for non-contact detection over material's surface can capture important information on evolution of mechanical response under various conditions. Therefore, components necessary mapping and analysis have now been integrated into versatile transportable be used materials in...
Thermal barrier coatings (TBCs) are used to protect turbine components from extreme environments and allow for the system operate at temperatures beyond melting point of underlying superalloy blade. Existing in situ temperature measurement methods high evaluation have inherent uncertainties that impose important safety margins. Improving accuracy measurements on materials operating conditions is key more reliable lifetime predictions increase efficiencies. For this objective, phosphor...
Aluminum alloys in aerospace structures are prone to stress corrosion cracking (SCC), resulting premature failure. Understanding the key mechanisms initiating SCC is crucial for enhancing resistance. While extensive research exists on SCC, quantifying 3D volumes a means attain more comprehensive understanding of driving factors. In-situ x-ray synchrotron tomography offers potential insights unattainable through 2D or surface-level methods, narrowing characterization scale. This technique has...
View Video Presentation: https://doi.org/10.2514/6.2023-0182.vid Degradation of aircraft structural integrity due to corrosion damage is one challenge that leads high costs in equipment and maintenance, which affects operation safety aircraft. Stress cracking (SCC) a commonly observed phenomenon materials, especially for high-strength aluminum alloys, exacerbated by residual tensile stresses from manufacturing treatment processes affected loads forces addition the build-up by-products....
Phosphor thermometry is a promising non-destructive method for accurate temperature measurement using phosphor elements that emit temperature-dependent luminescence. The relies on the intensity and decay of luminescence arising from upon excitation by an incident laser. In this work, classical Kubelka-Munk model has been utilized modified to emitted are added into thermal barrier coatings (TBCs) enable sensing thermometry. collectible its time-decay behavior emerging tailorable multilayer...
Abstract Stress corrosion is a critical issue that leads to high costs in lost equipment and maintenance, affecting the operation safety of aircraft platforms. Most aerospace structural components use aluminum alloys 7xxx series, which contain Al, Cu, Zn, Mg, due combined advantage its high-strength lightweight. However, such alloys, specifically AA7075-T4 AA7075-T651, are susceptible stress cracking when exposed both mechanical stresses corrosive environments. gives rise major technological...