Graduate Students | Raghavan Research Group

Remelisa Esteves

estevesr_at_knights.ucf.edu

Remelisa Esteves is currently pursuing a PhD in aerospace engineering at UCF. She earned her bachelor’s degree in aerospace engineering, with a minor in applied mathematics, from Embry-Riddle Aeronautical University (ERAU) in the spring of 2016. She graduated from UCF with a master’s degree in aerospace engineering (space systems design and engineering track) in the spring of 2020. She is part of the ALOX team and led a project that involves developing stress-sensing coatings for nondestructive evaluation applications based on the piezospectroscopic method. She is also lead of the Corrosion team and is investigating damage initiation mechanisms in aerospace alloys due to stress corrosion cracking. From June 2018 to December 2019, she conducted research with Boeing collaborators while gaining industry experience as part of the National Science Foundation (NSF) INTERN program. In 2021, she was awarded an internship under the Naval Research Enterprise Internship Program (NREIP), which allowed her to spend the summer working with the F/A-18 Stress Team to perform stress analysis on fasteners with complex configurations. Remelisa is passionate about airplanes and strives to broaden her knowledge in aerospace structures and materials. During her spare time, she enjoys volunteering at outreach events, reading, doing arts and crafts, playing ukulele and guitar, playing videogames, running, and learning new languages. She is also a member of AIAA, SAMPE, and SWE. Remelisa joined the lab as a graduate student in Fall 2017.

Journal Papers:

Agathe Demay, Johnathan Hernandez, Perla Latorre, Remelisa Esteves, Seetha Raghavan. “Functional Coatings for Damage Detection in Aerospace Structures”, Technology & Innovation, Volume 22, Number 1, June 2021, pp. 95-103(9).

Remelisa Esteves, Johnathan Hernandez, Khanh Vo, Ryan Hoover, Gregory Freihofer and Seetha Raghavan, “Measurements for stress sensing of composites using tailored piezospectroscopic coatings“, AIP Advances, 9(5), 055201 (2019).

Conference Papers:

Remelisa Esteves, Ryan Hoover, Khanh Vo, Sanjida A. Jahan, Sandip Haldar, Seetha Raghavan, “Application of Stress Sensing Coatings on Metal Substrates with a Sub-surface Notch,” 2019 AIAA SciTech Forum, 7-11 January 2019, San Diego, California

Remelisa Esteves, Ryan Hoover, Khanh Vo, Seetha Raghavan, “Piezospectroscopic coatings: Effects of alumina nanoparticle volume fraction on stress-sensing,” Society for the Advancement of Material and Process Engineering (SAMPE), 21-25 May 2018, Long Beach, California.

Posters/Presentations:

Reed N., Latorre-Suarez P., Vo K., Hoover R., Esteves R., Olvera A., Hernandez H., Raghavan S., “Stress Sensing of Alumina-Epoxy Coatings with Varying Volume Fractions of Alumina Particles using Photoluminescence Piezospectroscopy” Showcase of Undergraduate Research Excellence, UCF, April, 2019.

Vo K., Stein Z., Esteves R., Gu S., Gou J., Raghavan S., “3D Printed Stress Sensing Coating on Composite Materials” Showcase of Undergraduate Research Excellence, UCF, April, 2019.

Vo K., Esteves R., Abdelgader M., Hoover R., Jahan S., Raghavan S., “Spectroscopic Analyses of Composite Materials Using a Spectroscopic Portable System”, Showcase of Undergraduate Research Excellence, UCF, April, 2018.

Thesis:

Remelisa Esteves, “Piezospectroscopic Sensing Systems – Multi-Scale and In-Situ Sensing Technology for Structural Integrity” Masters Thesis, University of Central Florida, 2020, STARS (2020 – 42)

Johnathan (far right) and his team at Hermeus

Johnathan Hernandez

hjohnathan2177_at_knights.ucf.edu

Johnathan Hernandez is currently pursuing his PhD in aerospace engineering focused on Thermal protection and management for hypersonic leading edges looking at high fidelity CFD to provide guidance to high-temp in-situ thermomechanical instrumentation . Johnathan is also a aerothermal engineer at Hermeus where he owns all thermal analysis and TPS design. During his Master’s he lead a new project based on non-destructive techniques of undercoating corrosion detection through Pulsed Eddy Current thermography. During his free time, he enjoys playing computer games and enjoying the company of friends and family. Johnathan joined the lab in Spring 2017.

Journal Papers:

Chance Barrett, Zachary Stein, Johnathan Hernandez, Ravisankar Naraparaju, Uwe Schulz, Laurene Tetard, and Seetha Raghavan, “Detrimental effects of sand ingression in jet engine ceramic coatings captured with Raman-based 3D rendering,” Journal of the European Ceramic Society, 41(2), 1664-1671, 2021.

Lin Rossmann, Brooke Sarley, Johnathan Hernandez, Peter Kenesei, Alain Köster, Janine Wischek, Jonathan Almer, Vincent Maurel, Marion Bartsch, and Seetha Raghavan. Method for conducting in situ high-temperature digital image correlation with simultaneous synchrotron measurements under thermomechanical conditions. Review of Scientific Instruments, 91(3), 033705, 2020.

Quentin Fouliard, Johnathan Hernandez, Bauke Heeg, Ranajay Ghosh, Seetha Raghavan, “Phosphor Thermometry Instrumentation for Synchronized Acquisition of Luminescence Lifetime Decay on Thermal Barrier Coatings”, Measurement Science and Technology, 2020.

Conference Papers:

Quentin Fouliard, Johnathan Hernandez, Hossein Ebrahimi, Khanh Vo, Frank Accornero, Mary McCay, Jun-Sang Park, Jonathan Almer, Ranajay Ghosh, Seetha Raghavan ”Synchrotron X-Ray Diffraction To Quantify In-Situ Strain On Rare-Earth Doped Yttria-Stabilized Zirconia Thermal Barrier Coatings”, ASME Turbo Expo 2021: Turbomachinery Technical Conference & Exposition. American Society of Mechanical Engineers, 2021. (Accepted)

Johnathan Hernandez, Quentin P. Fouliard, Khanh Vo, and Seetha Raghavan. “Characterization of corrosive defects through pulsed eddy current thermography for aircraft panels” AIAA Scitech Forum. January 12, 2021.

Johnathan Hernandez, Quentin Fouliard, Caroline Anderson, Matthew Northam, Khanh Vo, Jared Clabaugh, Douglas Wolfe et al. “In-Situ XRD Characterization of Interface Strains In Multilayered Ceramic Composite Systems for Hypersonics Applications” In 23rd AIAA International Space Planes and Hypersonic Systems and Technologies Conference. 2020.

Johnathan Hernandez, Quentin Fouliard, Khanh Vo, Seetha Raghavan,”Simulation and Experimentation of Pulsed Eddy Current Thermography for Corrosion Detection Under Insulation,” AIAA Scitech Forum, Orlando, FL, January 6-10, 2020.

Lin Rossmann, Brooke Sarley, Johnathan Hernandez, Peter Kenesei, Jonathan Almer, Janine Wischek, Marion Bartsch, Alain Köster, Vincent Maurel, Seetha Raghavan, “Method for Conducting In Situ High Temperature DIC with Simultaneous Synchrotron Measurements under Thermomechanical Load”, AIAA Science and Technology Forum and Exposition, Orlando, FL, 8-12 January 2018.

Sanjida A. Jahan, Mohamed Abdelgader, Eric Barker, Johnathan Hernandez, Ryan Hoover, Hao Pan, Yuanli Bai, Declan Carolan, Ambrose Taylor, Seetha Raghavan, “Effect of Functionalization on Mechanical Properties of Hybrid Carbon Fiber Reinforced Polymer (HCFRP) Composites Using Piezopectroscopy,” AIAA Science and Technology Forum and Exposition, Orlando, FL, 8-12 January 2018.

Estefania Bohorquez, Brooke Sarley, Johnathan Hernandez, Ryan Hoover, Laurene Tetard, Ravisankar Naraparaju, Uwe Schulz, Seetha Raghavan, “Investigation of the Effects of CMAS-infiltration in EB-PVD 7% Yttria-Stabilized Zirconia via Raman Spectroscopy,” AIAA Science and Technology Forum and Exposition, Orlando, FL, 8-12 January 2018.

Posters/Presentations:

Hernandez J., Fouliard Q., Vo K., Ghosh R., Raghavan S., “A Study on Phosphor Thermometry Thermal Gradient Sensitivities for Gas Turbine Environments” UCF CREOL Industrial Affiliates Day, UCF, April, 2021.

Reed N., Latorre-Suarez P., Vo K., Hoover R., Esteves R., Olvera A., Hernandez J., Raghavan S., “Stress Sensing of Alumina-Epoxy Coatings with Varying Volume Fractions of Alumina Particles using Photoluminescence Piezospectroscopy” Showcase of Undergraduate Research Excellence, UCF, April, 2019.

Barker E., Hernandez J., Jahan S., Selimov A., Carolan D., Taylor A., Raghavan S., “Effects of Functionalization on Hybrid Carbon Fiber Reinforced Polymer Composites Through Photoluminescence Spectroscopy”, Showcase of Undergraduate Research Excellence, 2017.

Thesis:

Johnathan Hernandez, “Experimentation and Simulation of Pulsed Eddy Current Thermography of Subsurface Aircraft Corrosive Defects” Masters Thesis, University of Central Florida, 2020 STARTS (2020 – 56)

Zachary Stein

steinzj_at_knights.ucf.edu

Zac is a graduate student currently pursuing a PhD in Aerospace Engineering with an interest in aerospace materials research. In his spare time, he enjoys designing and building high-power rockets, exploring new topics, and volunteering in STEM-related outreach to students in the Greater Orlando area. In the lab, Zac studies the detrimental degradation effects caused by molten sand deposits (CMAS) on high temperature coatings, such as thermal barrier coatings (TBCs) and environmental barrier coatings (EBCs) in jet engine applications. This research led him to lead in designing and conducting experiments at Argonne National Laboratory (ANL) during Summer 2018. He presented those results as part of his Summer Undergraduate Research Fellowship (SURF) at UCF in July 2018.

Zac was able to expand upon his research on CMAS and TBC interactions when he participated in a National Science Foundation sponsored International Research Experience for Students (IRES) program where he spent 10 weeks during Summer 2019 conducting research with collaborators at the German Aerospace Center (DLR) in Cologne, Germany. Zac returned to DLR in May 2021 when he was awarded a Fulbright U.S. Fellowship. During his Fulbright, Zac is focused on characterizing the effects of CMAS infiltration into multilayer high temperature environmental barrier coatings (EBCs), which formed the basis of his PhD work.

Recently, Zac has also been awarded the prestigious Department of Defense’s 2021 National Defense Science and Engineering (NDSEG) Fellowship to support his PhD work. Zac is focusing on capturing the effects of CMAS infiltration into novel CMAS-resistant coatings and characterize these coatings through both contemporary and innovative measurement techniques.

Zac joined the lab as an undergraduate in Spring 2018 and has continued his research in the lab as a graduate student in Fall 2020.

Journal Papers:

Zachary Stein, Peter Kenesei, Jun-Sang Park, Jonathan Almer, Ravisankar Naraparaju, Uwe Schulz, and Seetha Raghavan, “High-energy X-ray phase analysis of CMAS-infiltrated 7YSZ thermal barrier coatings: Effect of time and temperature“, Journal of Materials Research, 35(17), 2300-2310, 2020.

Conference Proceedings:

Hessein Ali, Zachary Stein, Quentin Fouliard, Hossein Ebrahimi, Peter Warren, Seetha Raghavan, Ranajay Ghosh, “Computational Model of Mechano-Electrochemical Effect of Aluminum Alloys Corrosion”, Turbo Expo: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2021. (Accepted)

Zachary Stein, Ravisankar Naraparaju, Uwe Schulz, Peter Kenesei, Jun-Sang Park, Jonathan Almer, Seetha Raghavan, “Synchrotron X-Ray Diffraction Study of Phase Transformation in CMAS Ingressed EB-PVD Thermal Barrier Coatings,” AIAA Scitech Forum, Orlando, FL, January 6-10, 2020.

Posters/Video Presentations:

D’Esposito V., Stein Z., Raghavan S., “Effects of CMAS Infiltration on Thermal Barrier Coatings Analyzed by Confocal Raman Spectroscopy and Synchrotron High-Energy X-Rays” UCF Student Scholar Symposium, UCF, April, 2021.

Stein Z., Haldar S., Park J., Kenesei P., Almer J., Naraparaju R., Raghavan S., “CMAS Ingression Study on EB-PVD Thermal Barrier Coatings Using Synchrotron X-Ray Diffraction” Showcase of Undergraduate Research Excellence, UCF, April, 2019.

Smith M., Stein Z., Northam M., Rossmann L., Sarley B., Park J., Kenesei P., Almer J., Harder B., Viswanathan V., Raghavan S., “Phase Volume Fraction Compared Between PS-PVD & EB-PVD After Thermal Cycling Via X-Ray Diffraction” Showcase of Undergraduate Research Excellence, UCF, April, 2019.

Vo K., Stein Z., Esteves R., Gu S., Gou J., Raghavan S., “3D Printed Stress Sensing Coating on Composite Materials” Showcase of Undergraduate Research Excellence, UCF, April, 2019.

Stein Z., Bohorquez E., Rossmann L., Park J., Kenesei P., Almer J., Naraparaju R., Raghavan S. “Synchrotron X-Ray Diffraction Study of CMAS Ingression in Electron-Beam Physical Vapor Deposition Thermal Barrier Coatings” UCF SURF poster presentation, July, 2018.

Stein Z., Bohorquez E., Rossmann L., Naraparaju R., Raghavan S., “X-ray Diffraction Studies of CMAS Infiltrated Thermal Barrier Coating”, Showcase of Undergraduate Research Excellence, UCF, April, 2018.

Thesis:

Zachary Stein, “Degradation From CMAS Infiltration in 7YSZ EB-PVD Thermal Barrier Coatings” Undergraduate Thesis, University of Central Florida, 2020 (2020 – 762)

José Mayí-Rivas

jose.mayi_at_knights.ucf.edu

José is currently a PhD student at UCF majoring in Mechanical Engineering. He also works as a design and analysis engineer with NASA at Kennedy Space Center. His research interest include nondestructive evaluation methods, analytical methods for both materials and classical mechanics, optomechanical systems, and micro propulsion. José has two Master’s degree, one in Mechanical Engineering and another in Space Systems, both from the Florida Institute of Technology (2012). He has over 10 years of professional experience in the aerospace industry working in modeling and analysis of mechanical components using finite element methods and rigid body dynamics. José joined the lab in Fall 2016.

Khanh Vo

KhanhVo158_at_knights.ucf.edu

Khanh is a Master’s student at UCF starting in the fall of 2020. He joined the team in the spring of 2017 in his undergraduate years. He is greatly interested in structures and materials testing. Khanh was involved with the stress sensing coating funded by Partnership for Innovation using alumina nanoparticles and photoluminescent piezo-spectroscopy in spring of 2018. He later worked on a project to develop instrumentation for detecting Corrosion under Insulation using pulsed eddy current thermography. Currently he is working with the Department of Energy team to research phosphor thermometry for greater precision temperature measurements. He is also working with the Hypersonic team to develop novel EBC configurations for reusable hypersonic flight.

He has a great interest in STEM outreach and community involvement like with Outreach Love to tutor and mentor kids in Orlando. His hobbies include Piano, fencing, and martial arts. currently part of the group’s corrosion, hypersonics, and DoE funded teams. He has a great interest in STEM outreach and materials research. His hobbies include piano, fencing, and martial arts.

Journal Papers:

Conference Proceedings:

Posters/Video Presentations:

Vo K., Stein Z., Esteves R., Gu S., Gou J., Raghavan S., “3D Printed Stress Sensing Coating on Composite Materials” Showcase of Undergraduate Research Excellence, UCF, April, 2019.

Perla Latorre-Suárez

perlalatorre_at_knights.ucf.edu

Perla is a graduate student pursuing a master’s degree in aerospace engineering. Perla pursued undergraduate research in Fall 2018 through the L.E.A.R.N. program at UCF, which helps students pursue research in their interested area while receiving a scholarship and learning about the different graduate programs that UCF has to offer. She is part of the ALOX team; this team works on investigating stress-sensing coatings for structural health monitoring through the piezospectroscopic method. Perla led the NASA MINDS program and a team of 5 undergraduate students while working on manufacturing a method to 3D print sensors for structural integrity. She has participated at the Showcase of Undergraduate Research Excellence, received OUR grants, and participated and led STEM outreach activities. During the summer of 2021, Perla participated in the X-Force Fellowship for the National Security Innovation Network. In this fellowship, she worked on a project with multiple tethered drones for the Army Research Lab. Perla is also a recipient of the 2021-2022 NASA Florida Space Grant Consortium Masters Fellowship. In Spring 2021, Perla completed her bachelor’s degree in mechanical engineering. She will continue her research on 3D printing sensors for structural integrity on space components used in lunar or other planetary missions. When she is not at the lab, Perla enjoys running and spending time with her family and friends. Perla joined the lab in Fall 2018.

Conference Papers:

Perla Latorre-Suraez, Rohan Madathil, Nya Segura-Watson, Felix Morales, Vanessa D’Esposito, and Seetha Raghavan, “3D Printed Stress Sensors for Non-Destructive Evaluation of Space Structures” AIAA 2021 Regional Student Conference, April 2021.

Posters/Presentations:

Latorre-Suarez P., Madathil R., Segura-Watson N., Morales F., D’Esposito V., Raghavan S., “Developing a 3D Printing Method to Print Stress Sensing Sensors for Structural Health Monitoring” UCF Student Scholar Symposium, UCF, April, 2021 (Undergraduate Presentation Winner).

Oneilia Swaby

OneiliaSwaby_at_knights.ucf.edu

Oneilia Swaby is a Graduate student pursuing a PhD in Aerospace Engineering. She earned her Bachelor’s degree in Aerospace Engineering in May 2022. She is part of the ALOX team, a team that works towards developing stress-sensing coatings using piezospectroscopy. Oneilia’s research interests include the development of metallic materials and additive manufacturing for long term space colonization. She hopes to one day open a nonprofit organization to promote STEM education to children from low-income backgrounds. Oneilia is a recipient of the NASA MSTAR Fellowship. Her hobbies include cooking, baking, and running. During the summer of 2022, Oneilia completed an internship at NASA Langley in which she focused on the development of metal matrix composite materials with multifunctional properties. She is the recipient of the UCF Trustees Doctoral Fellowship. She joined the lab Fall 2021.