Alumni | Raghavan Research Group

Nicholas Reed

nicholasreed_at_knights.ucf.edu

Nicholas is a graduate student pursuing a Master’s degree in Aerospace Engineering, and is a part of UCF’s Accelerated BS to MS program. He is interested in aerospace materials research and is a part of the MIS team. He is a National Merit Scholar, and a member of AIAA, Phi Kappa Phi Honor Society, and Golden Key International Honour Society. His hobbies include 3D printing, tabletop RPG’s, and playing guitar. He joined the lab in Spring 2019.

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.

Terrence Edwards

elijahedwards_at_knights.ucf.edu

Terrence received his Bachelor in Science degree in Aerospace Engineering in Fall 2020. He joined the lab in Summer 2020. He is interested in structures and materials, and suitably joined the CMAS team. He has 2 years of technical internship experience with various engineering companies including: Lockheed Martin, Northrop Grumman, and Sparton Defense and Security. Additionally, he is proudly serving in the United States Air Force Reserve as an RF Transmissions Technician. His hobbies include woodworking, tinkering, fishing, and working out.

Ryan Hoover

ryanhoover_at_knights.ucf.edu

Ryan received his Bachelor in Science degree in Mechanical Engineering in Fall 2020. He joined the lab in Spring 2015. He worked with the lab’s ALOX team, researching the use of alumina particles for non-destructive stress and damage detection in composite and metallic materials for various aerospace applications. He is a member of UCF’s AIAA and ASME student engineering organizations. His hobbies include drawing and swimming.

Journal Papers:

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 Proceedings:

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, San Diego, California, 7-11 January 2019

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), Long Beach, California, 21-25 May 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,” 2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Kissimmee, Florida, 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,” 2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, , Kissimmee, Florida, 8–12 January 2018.

Alex Selimov, Ryan Hoover, Quentin Fouliard, Albert Manero II, Peter Dackus, Declan Carolan, Ambrose Taylor, Seetha Raghavan, “Characterization of Hybrid Carbon Fiber Composites using Photoluminescence Spectroscopy,” 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Grapevine, Texas, 9-13 January 2017.

Posters/Video Presentations:

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.

Bohorquez E., Barrett C., Hoover R., Tetard L., Raghavan S., “Raman Studies on EB-PVD 7%Yttria – Stabilized Zirconia coatings with CMAS Deposits,” ECI: Thermal Barrier Coatings V Conference, Irsee, Germany, July, 2018.

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.

Hoover R., Bohorquez E., Ganesan J.P., Rossman L., Naraparaju R., Schulz U., Raghavan S., “Investigation of the Effects of CMAS-ingressed Thermal Barrier Coatings via Piezospectroscopy”, Showcase of Undergraduate Excellence, 2017.

Selimov A., Hoover R., Villegas V., Manero A., Dackus P., Carolan D., Taylor A., Raghavan S., “Mechanical Analysis of Hybrid Carbon Fiber Reinforced with Alumina Nanoparticles via Piezospectroscopy”, Showcase of Undergraduate Research Excellence UCF, 2016.

Matthew Northam

matthewnortham_at_knights.ucf.edu

Matt received a Master’s degree in Aerospace Engineering with a focus on Space Systems Design and Engineering in December 2019. He completed his Bachelor’s of Science in Mechanical Engineering in 2016 at UCF, then worked for two years as a design engineer at American Civil Engineering Company in Orlando before deciding to devote his time to research and to pursue a graduate degree in the Aerospace field. He is interested in orbital and structural mechanics as well as materials science. He joined the lab in Fall 2016 as an undergraduate studying CMAS effects on TBCs, then rejoined in Spring 2018 to work on PS-PVD TBCs. In his free time, he enjoys listening to fictional audiobooks, traveling, and playing sports.

Journal Papers:

Rossmann, L., Northam, M., Sarley, B., Chernova, L., Viswanathan, V., Harder, B., & Raghavan, S. (2019). Investigation of TGO stress in thermally cycled plasma-spray physical vapor deposition and electron-beam physical vapor deposition thermal barrier coatings via photoluminescence spectroscopy. Surface and Coatings Technology, 125047.

Conference Papers:

Northam M., Rossmann L., Sarley B., Harder B., Park J., Kenesei P., Viswanathan V., Raghavan S., “Comparison of Electron-Beam Physical Vapor Deposition and Plasma-Spray Physical Vapor Deposition Thermal Barrier Coating Properties Using Synchrotron X-ray Diffraction,” ASME Turbomachinery Technical Conference and Exposition, Phoenix, AZ, June 17-21, 2019.

Rossmann L., Northam M., Sarley B., Chernova L., Viswanathan V., Harder B., Raghavan S., “Investigation of TGO stress in thermally cycled plasma-spray physical vapor deposition and electron-beam physical vapor deposition thermal barrier coatings via photoluminescence spectroscopy” International Conference on Metallurgical Coatings and Thin Films, San Diego, CA, May 19-24, 2019.

Northam M., Rossmann L., Sarley B., Park J., Kenesei P., Almer J., Viswanathan V., Harder B., Raghavan S., “Mechanical properties of coatings by Electron-Beam Physical Vapor Deposition and Plasma-Spray Physical Vapor Deposition compared using Synchrotron X-ray diffraction”, University Turbine Systems Research Project Review Meeting, Daytona Back, FL, 2018.

Posters/Presentations:

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.

Lin Rossmann

lin.rossmann_at_knights.ucf.edu

Lin joined the lab as an undergraduate in the spring of 2016. She was part of the 2016 field team that conducted synchrotron x-ray diffraction studies of additively manufactured superalloys for high-temperature applications at Argonne National Laboratory (ANL). As part of this work, she developed a novel method of obtaining images for digital image correlation at high temperature. She spent 10 weeks in the summer of 2017 conducting research in Cologne, Germany in collaboration with the German Aerospace Center (DLR) as part of the IRES program. She returned to ANL as part of the 2018 field team, using the synchrotron to study the properties of thermal barrier coatings for high-temperature applications. Thanks to a Fulbright award, she returned to DLR in Cologne for 10 months, from September 2018 to July 2019, continuing her research in thermal barrier coatings. She received a Master’s degree in Materials Science and Engineering in Summer 2019.

Journal Papers:

Conference Proceedings:

Quentin Fouliard, Sanjida A. Jahan, Lin Rossmann, Peter Warren, Ranajay Ghosh, Seetha Raghavan, “Configurations for Temperature Sensing of Thermal Barrier Coatings,” International Conference on Phosphor Thermometry, 25-27 July, 2018, Glasgow, UK.

Debraliz Isaac Aragones, Lin Rossmann, Estefania Bohorquez, Brooke Sarley, Owen Pryor, Seetha Raghavan, “US-Germany Collaboration in Materials for Extreme Environments: Developing an International Research Pathway Towards Creating Global Engineers for the Future,” ASEE-SE Educating the Engineer of the Future, 4-6 March 2018, Embry-Riddle Aeronautical University, Daytona Beach, Florida.

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 Jahan

sanjidajahan_at_knights.ucf.edu

Sanjida received her Master’s degree in Aerospace Engineering with a focus on Space Systems Design and Engineering. She completed her Bachelor’s of Science degree in Aeronautical Engineering in 2013 from the Military Institute of Science & Technology in Bangladesh. Sanjida gained 2 years of professional experience as an Aircraft Maintenance Planning Engineer in an airline in Bangladesh. She worked as a GTA at UCF and joined the Raghavan Research Group in the Fall 2016 semester. She worked on non-destructive techniques to characterize HCFRPs and improving their use for the aerospace industry. In her leisure time, she enjoys reading space/spacecraft articles, biking and traveling.

Journal Papers:

Alex Selimov, Sanjida Akter Jahan, Eric Barker, Peter Dackus, Declan Carolan, Ambrose Taylor, and Seetha Raghavan, “Silane functionalization effects on dispersion of alumina nanoparticles in hybrid carbon fiber composites,” Appl. Opt. 57, 6671-6678, 2018.

Conference Proceedings:

Theses/Dissertations:

Sanjida Akter Jahan, “Characterization of mechanical properties in nanoparticle reinforced hybrid carbon fiber composites using photoluminescence piezospectroscopy” Masters Thesis, University of Central Florida, 2017, STARS (CFE0006886).

Posters/Presentations:

Jahan S., Carolan D., Taylor A., Raghavan R., “Characterizing Hybrid Carbon Fiber Reinforced Polymer Composites Using Piezospectroscopy and Digital Image Correlation”, The Composites and Advanced Materials Expo, Orlando, FL, December, 2017.

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.

Albert Manero

albert_manero_at_knights.ucf.edu

Albert completed his Ph.D in fall 2016 while working on advanced aerospace materials for space craft and turbine blade protection systems. He graduated from the University of Central Florida with a Master’s in Aerospace Engineering in May 2014. Albert is a Fulbright Scholar and is conducting research at the German Aerospace Center. He is also a member of AIAA , The American Ceramic Society, and Sigma Gama Tau.

Journal Papers:

Albert Manero II, Kevin Knipe, Janine Wischek, Carla Meid, John Okasinski, Jonathan Almer, Anette M. Karlsson, Marion Bartsch, and Seetha Raghavan, “Capturing the Competing Influence of Thermal and Mechanical Loads on the Strain of Turbine Blade Coatings via High Energy X-Rays,” Coatings, 320, Vol. 8, issue 9, 2018

Albert Manero II, Alex Selimov, Quentin Foullard, Kevin Knipe, Janine Wischek, Carla Meid, Anette M, Karlsson, Marion Bartsch, Seetha Raghavan, “Piezospectroscopic evaluation and damage identification for thermal barrier coatings subjected to simulated engine environments”, Surface and Coatings Technology, 323, 30-38, 2016

Kevin Knipe, Albert Manero II, Sanna F. Siddiqui, Carla Meid, Janine Wischek, John Okasinski, Johnathan Almer, Anette M. Karlsson, Marion Bartsch, Seetha Raghavan, “Inside the Engine Environment–Synchrotrons Reveal Secrets of High-Temperature Ceramic Coatings. (Cover Story),” American Ceramic Society Bulletin, 94(1), 22-27. 2015

Albert Manero II, Jason Gibson, Gregory Freihofer, Jihua Gou, Seetha Raghavan, “Evaluating the effect of nano-particle additives in Kevlar® 29 impact resistant composites“, Composites Science and Technology, 116, 41-49 2015

Albert C. Manero II, Stephen Sofronsky, Kevin Knipe, John Okasinski, Jonathan Almer, Janine Wischek, Carla Meid, Anette Karlsson, Seetha Raghavan, Marion Bartsch, “Monitoring local strain in a thermal barrier coating system under thermal mechanical gas turbine operating conditions“, The Journal of The Minerals, Metals & Materials Society (TMS), 1-12, 2015.

Kevin Knipe, Albert C. Manero, II, Stephen Sofronsky, John Okasinski, Jonathan Almer, Janine Wischek, Carla Meid, Anette Karlsson, Marion Bartsch, Seetha Raghavan, “Synchrotron X-Ray Diffraction Measurements Mapping Internal Strains of Thermal Barrier Coatings During Thermal Gradient Mechanical Fatigue Loading“, Journal of Engineering for Gas Turbines and Power, 137(8), 082506, 2015.

K. Knipe, A. Manero II, S. Sofronsky, J. Okasinski, J. Almer, J. Wischek, C. Meid, A. Karlsson, M. Bartsch, S. Raghavan, “Synchrotron XRD Measurements Mapping Internal Strains of Thermal Barrier Coatings During Thermal Gradient Mechanical Fatigue Loading,” ASME Turbo Expo: Power for Land, Sea, and Air, Volume 6: Ceramics; Controls, Diagnostics and Instrumentation; Education; Manufacturing Materials and Metallurgy, 2014.

Kevin Knipe, Albert Manero, Sanna F. Siddiqui, Carla Meid, Janine Wischek, John Okasinski, Jonathan Almer, Anette M. Karlsson, Marion Bartsch, and Seetha Raghavan, “Strain response of thermal barrier coatings captured under extreme engine environments through synchrotron X-ray diffraction,” Nature Communications, 5, July 31, 2014.

Sanna F. Siddiqui, Kevin Knipe, Albert Manero, Carla Meid, Janine Wischek, John Okasinski, Jonathan Almer, Anette Karlsson, Marion Bartsch, and Seetha Raghavan, “Synchrotron X-Ray Measurement Techniques for Thermal Barrier Coated Cylindrical Samples under Thermal Gradients”, Review of Scientific Instruments, 84, 083904, 2013.

Conference Proceedings:

Brooke Sarley, Albert C. Manero, Jose Cotelo, Janine Wischek, John Okasnski, Peter Kenesei, Johnathan Almer, Marion Bartsch, Seetha Raghavan., “Real-time phase evolution of Selective Laser Melted (SLM) Inconel 718 with temperature through synchrotron X-rays,” 58th AIAA/ASCE/AHS/ASC Structural Dynamics, and Materials Conference, AIAA SciTech Forum, 9-13 January 2017, Grapevine, Texas.

Albert Manero II, Stephen Sofronsky, Katia Artzt, Stefan Hackemann, Janine Wischek, John Okasinksi, Peter Kenesei, Jonathan Almer, Marion Bartsch, Seetha Raghavan*, “Interpreting High Temperature Deformation Behavior of a Ceramic Matrix Composite via High Energy X-rays and Numerical Simulation,” SciTech 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 4-8 January 2016, San Diego, CA.

Albert C. Manero, Kevin Knipe, Carla Meid, Janine Wischek, Claudine Lacdao, Matthew Smith, John Okasinski, Jonathan Almer, Marion Bartsch, Anette Karlsson, Seetha Raghavan, “Comparison of Thermal Barrier Coating Stresses via High Energy X-Rays and Piezospectroscopy,” SciTech 53rd AIAA Aerospace Sciences Meeting, 5-9 January 2015, Kissimmee, FL.

Kevin Knipe, Albert Manero, Sanna F. Siddiqui, Stephen Sofronsky, Pascal Fouquet, Carla Meid, Janine Wischek, Marion Bartsch, John Okasinski, Jonathan Almer, Anette Karlsson and Seetha Raghavan “Synchrotron XRD Measurements of Thermal Barrier Coatings Subjected to Loads Representing Operational Conditions of Rotating Gas Turbine Blades,” AIAA SciTech 52nd Aerospace Sciences Meeting, 13-17 January 2014, National Harbor, Maryland.

Theses/Dissertations:

Albert Manero II, “High Temperature Mechanics of Aerospace Ceramic Composites via Synchrotron Radiation” Doctoral Dissertation, University of Central Florida, 2016, STARS (CFE0006836).

Albert Manero, “Nondestructive Analysis of Advanced Aerospace Materials via Spectroscopy and Synchrotron Radiation“, Masters Thesis, University of Central Florida, 2014, STARS (CFE0005657).

Presentations:

A. Manero, B. Sarley, K. Knipe, J. Wischek, C. Meid, J. Almer, J. Okasinski, A.M. Karlsson, M. Bartsch, S. Raghavan, “In-Situ Analyses of Thermal Barrier Coating’s Elastic and Inelastic Deformations via Synchrotron X-Rays”, 41st ICACC 2017, Daytona Beach, FL.

A. Manero, K. Artzt, J. Wischek, S. Sofronsky, S. Hackemann, J. Almer, J. Okasinski, P. Kenesei, S. Raghavan, M. Bartsch, “Synchrotron studies of Ceramic Matrix Composites under extreme loading conditions”, 40th ICACC 2016, Daytona Beach, FL.

A. Manero, S. Siddiqui, S. Sofronsky, K. Knipe, C. Lacdao, M. Smith, J. Wischek, C. Meid, A. Karlsson, M. Bartsch, S. Raghavan, “Piezospectroscopy Measurements of Thermal Barrier Coating Systems”, 38th ICACC 2014, Daytona Beach, FL.

K. Knipe, S. Sofronsky, S. Siddiqui, A. Manero, C. Meid, J. Wischek, J. Okasinski, J. Almer, A. Karlsson, M. Bartsch, S. Raghavan, “High Energy X-rays Characterizing the Material Behavior of High Temperature Thermal Barrier Coatings” 38th ICACC 2014, Daytona Beach, FL.

S. Siddiqui*, S. Scott, M. Ewen, K. Knipe, A. Manero, University of Central Florida, USA; J. Okasinski, J. Almer, L. Li, A. Feuerstein, S. Raghavan “Effect of Calcium-Magnesium-Alumina-Silicate on Strain within the TGO Layer of Thermal Barrier Coatings” ICACC 2013, Daytona Beach, FL.

K. Knipe*, A. Manero, S. Das, S. Siddiqui, S. Scott, M. Ewen, C. Meid, J. Schneider, DLR Aerospace, Germany; J. Okasinski, J. Almer, M. Bartsch, S. Raghavan, “Acquisition Techniques for Synchrotron X-ray Strain Measurements in Tubular TBC Specimens for Thermal Gradient Mechanical Testing” ICACC 2013, Daytona Beach, FL.

Posters/Video Presentations:

Sarley B., Manero A., Artzt K., Wischek J., Okasinski J., Almer J., Bartsch M., Raghavan S., “Characterization of the Microstructure of SLM IN718 Under Extreme Environments”, Showcase of Undergraduate Research Excellence UCF, 2016.

Sarley B., Manero A., Wischek J., Artzt K., Almer J., Okasinski J., Raghavan S., Bartsch M. “High-temperature Architectured Materials By Selective Laser Melting Characterized Under Extreme Conditions”, Society of Engineering Science Conference, College Stations, TX, October 2015.

Fouliard Q., Hanhan I., Benenati N., Silva A., Manero A., Raghavan S., “Hybrid Carbon Fiber Composite Characterization Via Piezospectroscopy”, Science and Technology of 2D Materials Conference,Orlando, FL, August 2015.

Sarley B., Manero A., Wischek J., Artzt K., Almer J., Okasinski J., Raghavan S., Bartsch M. “High-temperature Layered Materials By Selective Laser Melting Characterized Under Extreme Conditions”, Science and Technology of 2D Materials Conference, Orlando, FL, August 2015.

Sarley B., Manero A., Wischek J., Artzt K., Almer J., Okasinski J., Raghavan S., Bartsch M. “Analyzing Microstructure of Additively Manufactured Inconel 718”, Summer Undergraduate Research Fellowship, Orlando, FL, July 2015.

Fouquet P., Thomas D., Manero A., Stephen S., Siddiqui S., Knipe K., Lacdao C., Smith M., Meid C., Wischek J., Karlsson A., Bartsch M., Almer J., Okasinski J., Raghavan S., “Impact of Internal Cooling on Mechanical Response of Thermal Barrier Coatings”, UCF Showcase of Undergraduate Research Excellence UCF, 2015.

P. Fouquet, F. Ramirez, S. Sofronsky, A. Manero, K. Knipe, J. Okasinski, J. Almer, M. Bartsch, S. Raghavan, “In-situ Synchrotron Analysis of Thermal Barrier Coatings Under Thermal Gradients and Mechanical Loads”, Showcase of Undergraduate Research Excellence, UCF, 2014 (Honorable Mention Winner, Engineering).

Stephen Sofronsky, Michael Hunter, Albert Manero, Kevin Knipe, John Okasinski, Jonathan Almer, Marion Bartsch, and Seetha Raghavan, “Strain evolution within Thermal Barrier Coatings under Thermal Gradients and Mechanical Loads” ”, Showcase of Undergraduate Research in Engineering, UCF, 2013.

Siljee D., Manero A., Knipe K., Raghavan S., “Modeling Material Behavior of Thermal Barrier Coatings During Thermal-Mechanical Loading for Comparison with Experimental Results”, Showcase of Undergraduate Research Excellence UCF, 2012.

Thomas D., Ache M., Manero A., Siddiqui S., Sofronsky S., Knipe K., Lacdao C., Smith M., Meid C., Wischek J., Karlsson A., Bartsch M., Raghavan S., “Piezospectroscopic Studies on Tubular Geometry with Thermal Barrier Coatings”, Showcase of Undergraduate Research Excellence UCF, 2012.

Alex Selimov

alex.selimov_at_knights.ucf.edu

Alex was an undergraduate student who graduated with Honors in the Major after completing an undergraduate thesis titled “Characterization of Dispersion and Residual Stress in Nanoparticle Reinforced Hybrid Carbon Fiber Composites.” Portions of this work were presented at the 2017 SciTech Conference. He joined the group in Fall 2013 and has since coauthored several papers. Alex Selimov graduated from UCF in Fall of 2016 with a Bachelor’s of Science in Mechanical Engineering.

Journal Papers:

Imad Hanhan, Alex Selimov, Declan Carolan, Ambrose Taylor, Seetha Raghavan*, “Quantifying Alumina Nanoparticle Dispersion in Hybrid Carbon Fiber Composites Using Photoluminescent Spectroscopy”, Applied Spectroscopy, 71, 258-266, January 1, 2016

Conference Proceedings:

Imad Hanhan, Alex P.Selimov, Declan Carolan, Ambrose Taylor, Seetha Raghavan, “Characterizing Mechanical Properties of Hybrid Alumina Carbon Fiber Composites with Piezospectroscopy”, 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 4-8 January 2016, San Diego, CA.

Theses/Dissertations:

Alex Selimov, “Characterization of Dispersion and Residual Stress in Nanoparticle Reinforced Hybrid Carbon Fiber Composites”, Undergraduate Thesis, University of Central Florida, 2016, STARS (233).

Posters/Video Presentations:

Selimov A., Sofronsky S., Freihofer G., Schülzgen A., Raghavan S., “Multiscale Mechanics of Alumina Nanocomposites Under High Strain Rates via Piezospectroscopy”, Showcase of Undergraduate Research Excellence UCF, 2015.

A. Bullock, A. Selimov, S. Harms, G. Freihofer, S. Raghavan, “Piezospectroscopy for Noninvasive Stress Detection and Analysis of Structures” Showcase of Undergraduate Research Excellence, UCF, 2014

Gregory Freihofer

freihofer_at_knights.ucf.edu

Gregory joined the group in Summer 2009 as an Aerospace Engineering student interested in pursuing higher education in aerospace materials. As a student, he was a Member of Progress Energy Leadership Institute, and the National Scholars Society. Enthusiastic about learning and spreading the knowledge of science, he is a fan of Carl Sagan and his documentary “The Cosmos”. An avid runner, keeps in shape as a future Olympic sprinter prospect. As a graduate student, he spent summer 2012, 2013 and 2014 at Boeing Research & Technology in Seattle collaborating on research. He graduated with a Bachelors in Aerospace Engineering in spring 2010 and Masters in Fall 2011 and a PhD in Summer 2014. Greg continued working at UCF as a post doctoral associate for several months before starting to work at Northrop Grumman in June 2015.

Book Chapter:

Gregory Freihofer, Seetha Raghavan*, (In Press 2016) “Characterization and Performance of Stress and Damage Sensing Smart Coatings”, In Majid Hosseini, ASH Maklouf (Eds), “Industrial Applications for Intelligent Polymers and Coatings”, Volume 1, Springer, Germany.

Journal Papers:

Gregory Freihofer, Axel Schülzgen, Seetha Raghavan, “Damage Mapping with a Degrading Elastic Modulus using Piezospectroscopic Coatings”, NDT & E International, Vol. 75, 65-71, October 2015

Albert Manero II, Jason Gibson, Gregory Freihofer, Jihua Gou, Seetha Raghavan, “Evaluating the effect of nano-particle additives in Kevlar® 29 impact resistant composites”, Composites Science and Technology, 116, 41-49 2015

Gregory Freihofer, Joshua Dustin, Hong Tat, Axel Schülzgen and Seetha Raghavan, “Stress and structural damage sensing piezospectroscopic coatings validated with digital image correlation”, AIP Advances, 5, 037139 (2015).

Imad Hanhan, Erik Durnberg, Gregory Freihofer, Paul Akin, Seetha Raghavan, “Portable Piezospectroscopy System: Non-contact in-situ stress sensing through high resolution photo-luminescent mapping”, Journal of Instrumentation, 9, P11005, 2014

Gregory Freihofer, Axel Schülzgen, Seetha Raghavan, “Multiscale Mechanics to determine nanocomposite elastic properties with piezospectroscopy”, Acta Materialia, 81, 211-218, 2014.

Gregory Freihofer, Daniela Fugon-Dessources, Emrecan Ergin, Amy Van Newkirk, Ankur Gupta, Sudipta Seal, Axel Schülzgen, Seetha Raghavan, “Piezospectroscopic Measurements Capturing the Evolution of Plasma Spray-Coating Stresses with Substrate Loads ,”ACS Applied Materials & Interfaces, 2014, 6 (3), pp 1366–1369

Jason Gibson, James McKee, Gregory Freihofer, Seetha Raghavan and Jihua Gou, “Enhancement in ballistic performance of composite hard armor through carbon nanotubes,” International Journal of Smart and Nano Materials, Vol. 4 Issue 4. pp 212-228, 2014.

Gregory Freihofer, Seetha Raghavan, David Gosztola, “Investigation of temperature dependent multi-walled nanotube G and D doublet using pseudo-Voigt functions,” Applied Spectroscopy, Vol. 67 (3), pp. 321-328, 2013.

Gregory Freihofer, Fei Liang, Bharathi Mohan, Jihua Gou, Seetha Raghavan, “Ex-situ Raman spectroscopy to optimize the manufacturing process for a structural MWNT nanocomposite” International Journal of Smart and Nano Materials, Available online 24 Jan 2012.

Yibo Gao, Fei Liang, Gregory Freihofer, Benxin Wu, Bharathi Mohan, Seetha Raghavan, Jihua Gou, Shuyou Li, Brian Albee and Sandra Whaley Bishnoi, “Laser Sintering of Carbon Nanotube Reinforced Ceramic Composites ” International Journal of Smart and Nano Materials, Vol 2. Issue 4, 219-229 2011.

Gregory Freihofer, Laura Poliah, Kalippe Walker, Andre Medina and Seetha Raghavan, “Optical Stress Probe: In situ stress mapping with Raman and Photo-stimulated Luminescence Spectroscopy” Journal of Instrumentation, Vol 5, P12003, 2010.

Conference Proceedings:

Gregory Freihofer, Seetha Raghavan, “Damage Mapping of Composites with Piezospectroscopic Coatings,” SciTech 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 5-9 January 2015, Kissimmee, FL.

Erik Durnberg, Kevin Knipe, Gregory Freihofer, Imad Hanhan, Renfei Feng, Seetha Raghavan, “Particle Size Effect on Load Transfer in Single Particle Composite Samples via X-Ray Diffraction,” SciTech 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 5-9 January 2015, Kissimmee, FL.

G. Freihofer, and S. Raghavan. “Material State Measurements with Nanocomposite Piezospectroscopic Coatings,” SAMPE: The Composites and Advanced Materials Expo, 14-16 October, 2014, Orlando FL. Student paper competition 2nd Place Award (Presenter).

G.Freihofer, A. Bullock, F. Vaughn, H. Tat, J. Dustin, A. Schülzgen, S. Raghavan, “Stress and Damage Sensing of Composite Coupons with Piezospectroscopic Coatings,” Proceedings of the Society for the Advancement of Material and Process Engineering 2014 conference, 2-5 June 2014, Seattle, Washington.

E. Durnberg, I. Hanhan, G. Freihofer, D. Lui, J. Gou, S. Raghavan, “Experimental Piezospectroscopic Measurements to Study Load Transfer in a Single Alumina Particle Embedded Within an Epoxy Matrix,” Proceedings of the Society for the Advancement of Material and Process Engineering 2014 conference, 2-5 June 2014, Seattle, Washington.

Gregory Freihofer, Ankur Gupta, Amy Van Newkirk, Sudipta Seal, and Seetha Raghavan “Optical Stress Sensing Alumina Nanocomposite Coatings for Aerospace Structures”, AIAA SciTech 55th AIAA/ASME/ASCE/AHS/SC Structures, Structural Dynamics, and Materials Conference, 13-17 January 2014, National Harbor, Maryland.

Gregory Freihofer, Daniela Fugon, Ashley Jones, Emrecan Ergin, Axel Schülzgen and Seetha Raghavan, “Prediction of Piezospectroscopic properties with nanoparticle load transfer theories”, Proceedings of the Society for the Advancement of Material and Process Engineering 2013 conference, 6-9 May 2013, Long Beach, California.

Ashley Jones, Greg Freihofer, Daniela Fugon, Marc Lowen, and Seetha Raghavan “Low Strain Rate in situ piezospectroscopic studies of Alumina Nanocomposites”, Proceedings of the Society for the Advancement of Material and Process Engineering 2013 conference, 6-9 May 2013, Long Beach, California.

Ashley S. Jones, Gregory Freihofer, Emrecan Ergin, Kevin Lautenslager, Will Gysi, Axel Schülzgen, Seetha Raghavan and Hong Tat, “Embedded alumina nanoparticles as diagnostic coatings for structures”, Proceedings of the Society for the Advancement of Material and Process Engineering 2012 conference, 21-24 May 2012, Baltimore, MD. (Best paper award, 3rd place)

Gregory Freihofer, Spencer Frank, Emrecan Ergin, Ashley Jones, Amanda Stevenson, Axel Schülzgen and Seetha Raghavan and Hong Tat, “Measurement of load transfer within alumina nanoparticle epoxy composites using piezospectroscopy”, Proceedings of the Society for the Advancement of Material and Process Engineering 2012 conference, 21-24 May 2012, Baltimore, MD.

Freihofer, G., Wirth, Brian and Raghavan S. “Ex-Situ Raman Spectroscopy of Manufacturing Process for a MWNT Nanocomposite”, Proceedings of the Society for the Advancement of Material and Process Engineering 2011 conference, 23-26 May 2011, Long Beach, California.

Mohan, B., Freihofer, G. and Raghavan S. “An In situ Raman Stress Measurement Method for Tensile Testing of Carbon Nanofiber/Nanotube Composites”, Proceedings of the Society for the Advancement of Material and Process Engineering 2011 conference, 23-26 May 2011, Long Beach, California.

Bharathi Mohan, Gregory Freihofer and Seetha Raghavan, “Measuring Tensile Stresses in CNF/Polymer composites using Raman Spectroscopy” Proceedings of the 52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 4-7th April 2011, Denver, Colorado.

Gregory Freihofer, Adonay Jimenez and Seetha Raghavan “Optical Spectra of Carbon Nanotubes for Stress Measurements of Advanced Aerospace Structures”, Proceedings of the 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference, 12-15th April 2010, Orlando, Florida.

G. Freihofer, B. Mohan & S.Raghavan, “In-situ techniques in optical spectroscopy for the analysis of carbon nanotubes”, Nanotech 2010, Chapter 1: Nanoscale Materials Characterization; pp 99-102, Anaheim, CA.

Theses/Dissertations:

Gregory Freihofer, “Nanocomposite Coating Mechanics via Piezospectroscopy”, Doctoral Dissertation, University of Central Florida, 2014, STARS (CFE0005614).

Gregory J. Freihofer, “Enhancing Cnt-composites With Raman Spectroscopy”, Masters Thesis, University of Central Florida, 2011, STARS (CFE0004110).

Posters/Video Presentations:

I. Hanhan, J. Rosas, A. Lai, E. Durnberg, A. Jones, G. Freihofer, S. Raghavan, “Alumina Particulate-Epoxy Composite Mechanics Via Piezospectroscopy”, Showcase of Undergraduate Research Excellence, UCF, 2014.

Erik Durnberg, Timothy Johnson, Forrest Vaughn, Gregory Freihofer, Seetha Raghavan “Piezospectropy To Compare Analytical And Numerical Nanoparticle Load Transfer Theories”, Showcase of Undergraduate Research in Engineering, UCF, 2013 (1st Place winner, Engineering).

William Gysi, Kevin Laugtenslager, Gregory Freihofer, Ashley Jones, Axel Schülzgen and Seetha Raghavan, “Stress-sensing nanomaterials using photo- stimulated luminescence spectroscopy”, Showcase of Undergraduate Research in Engineering, UCF, 2012 (1st Place winner, Engineering).

Spencer Frank, Erik Durnberg, Gregory Freihofer, Ashley Jones, Seetha Raghavan “A Theoretical Model of Load-Transfer in an Alumina Nanoparticle Filled Epoxy Matrix to Obtain Stress-Sensing Characteristics”, Showcase of Undergraduate Research in Engineering, UCF, 2012 (Honorable Mention winner, Engineering).

Freihofer G., Mohan B., Wirth B., Raghavan S., “In Situ Techniques in Optical Spectroscopy for the Analysis of Carbon Nanotubes”, Nanotech Conference, Anaheim, CA, 2010.

Gregory Freihofer, Adonay Jimenez, Seetha Raghavan, and David Gosztola. “Temperature and laser excitation effects on the raman spectra of carbon nanotube engineered paper.” In Poster presentation at the CNM Users Meeting, Argonne, IL., 2009.

grad

Kevin Knipe

kknipe27_at_gmail.com

Kevin received his bachelors at Ohio State University and his Masters at UCF in 2009 before joining our group. As a graduate student he worked on high temperature coatings and conducted several novel research experiments at the Advanced Photon Source in Argonne National Laboratory. He enjoys playing sports. He received his PhD in Mechanical Engineering in Summer 2014.

Journal Papers:

Albert C. Manero II, Stephen Sofronsky, Kevin Knipe, John Okasinski, Jonathan Almer, Janine Wischek, Carla Meid, Anette Karlsson, Seetha Raghavan, Marion Bartsch, “Monitoring local strain in a thermal barrier coating system under thermal mechanical gas turbine operating conditions”, The Journal of The Minerals, Metals & Materials Society (TMS), 1-12, 2015.

Kevin Knipe, Albert C. Manero, II, Stephen Sofronsky, John Okasinski, Jonathan Almer, Janine Wischek, Carla Meid, Anette Karlsson, Marion Bartsch, Seetha Raghavan, “Synchrotron X-Ray Diffraction Measurements Mapping Internal Strains of Thermal Barrier Coatings During Thermal Gradient Mechanical Fatigue Loading”, Journal of Engineering for Gas Turbines and Power, 137(8), 082506, 2015.

Conference Proceedings:

Kevin Knipe, David Siljee, John Okasinski, Jonathan Almer, S. Raghavan, Sendil Rangaswamy “Simulations Mapping Stress Evolution in High Temperature Ceramic Coatings under Thermal-Mechanical Conditions”, AIAA Structures, Structural Dynamics, and Materials Conference, Boston, MA, 2013.

Theses/Dissertations:

Kevin Knipe, “In-situ synchrotron studies of turbine blade thermal barrier coatings under extreme environments”, Doctoral Dissertation, University of Central Florida, 2014, STARS (CFE0005640).

Presentations:

Posters/Video Presentations:

Scott S., Lui A., Field Talia., Knipe K., Almer J., Okasinski J., Perez H.P., Imbrie P., Raghavan S., “The Role of Thermo-Mechanical Loads on Depth-Resolved Strain in EB-PVD Thermal Barrier Coatings – In-situ Synchrotron Studies”, Showcase of Undergraduate Research of Excellence UCF, 2012.

Erik Durnberg

erikd_at_knights.ucf.edu

Erik joined the team in the Summer of 2011 as an undergraduate researcher and then as a graduate Aerospace Engineering student participating in the BS-MS program. He worked on research studying the load transfer in alumina-epoxy materials. As a student he participated in SGT, AIAA and ASME and his hobbies include music, specifically drums. He was also an intern at Aerospace Corp. Erik graduated in Summer 2014 with a Masters in Aerospace Engineering.

Journal Papers:

Conference Proceedings:

Erik Durnberg, Ashley Jones, Joseangel Rosas, George Sunny, and Seetha Raghavan, “Monitoring Strain Rate Effects on Nanocomposites using Piezospectroscopy”, AIAA SciTech 55th AIAA/ASME/ASCE/AHS/SC Structures, Structural Dynamics, and Materials Conference, 13-17 January 2014, National Harbor, Maryland.

Theses/Dissertations:

Erik Durnberg, “Load Transfer in an Isolated Particle Embedded within an Epoxy Matrix”, Masters Thesis, University of Central Florida, 2014, STARS (CFE0005326).

Posters/Video Presentations:

Imad Hanhan

Imad.Hanhan_at_ucf.edu

Imad is an undergraduate mechanical engineering student. He is interested in aerospace materials and composite research, and is currently pursuing an Honors in the Major Thesis regarding a hybrid carbon fiber composite for advanced sensing. Imad also had the opportunity to conduct research at the Canadian Light Source, and at Purdue University. Imad’s hobbies include playing the piano and cooking. He joined the team in the Summer of 2013 and graduated with an honors in the major thesis in Spring 2015.

Journal Papers:

Conference Proceedings:

Theses/Dissertations:

Imad Hanhan, “Hybrid Carbon Fiber Alumina Nanocomposite for Non-Contact Stress Sensing Via Piezospectroscopy”, Honors Thesis, University of Central Florida, 2015, STARS (CFH0004750).

Posters/Video Presentations:

Hanhan I., “Hybrid Carbon Fiber Composite for Non-Contact Stress Sensing via Piezospectroscopy” SHowcase of Undergraduate Research Excellence UCF, 2015 (Honorable Menton winner, Engineering).

Stephen Sofronsky

stephenCS_at_knights.ucf.edu

Stephen is an Aerospace and Mechanical Engineering student interested in thermal barrier coatings on turbine blades. He is a member of AIAA and joined the group in the fall of 2012. Stephen spent summer 2014 at Boeing Research & Technology in Seattle.

Journal Papers:

Albert C. Manero II, Stephen Sofronsky, Kevin Knipe, John Okasinski, Jonathan Almer, Janine Wischek, Carla Meid, Anette Karlsson, Seetha Raghavan, Marion Bartsch, “Monitoring local strain in a thermal barrier coating system under thermal mechanical gas turbine operating conditions”, The Journal of The Minerals, Metals & Materials Society (TMS), 1-12, 2015.

Kevin Knipe, Albert C. Manero, II, Stephen Sofronsky, John Okasinski, Jonathan Almer, Janine Wischek, Carla Meid, Anette Karlsson, Marion Bartsch, Seetha Raghavan, “Synchrotron X-Ray Diffraction Measurements Mapping Internal Strains of Thermal Barrier Coatings During Thermal Gradient Mechanical Fatigue Loading”, Journal of Engineering for Gas Turbines and Power, 137(8), 082506, 2015.

Conference Proceedings:

Presentations:

Posters/Video Presentations: