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Most Impactful NESC Assessments 


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After reflecting on the more than 1,200 assessments completed by the NESC over the last 20 years, Director Tim Wilson selected these assessments as his top three. They were selected because they would likely have the greatest and most lasting impact on human life and the furtherance of the NESC mission. He shared why their effects were so far-reaching.

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2013-2019 
Assessing Risks of Frangible Joint Designs 

At the request of the Commercial Crew Program, the NESC took on an empirical test program of frangible joints to provide confidence in their use for human spaceflight. “Many programs use these joints, so understanding the margins and what drives their designs has helped us keep flight crews safe and make missions successful,” said Mr. Wilson. 

The joints provide a debris-free separation of launch vehicle stages and payload fairings. To determine the effects various design parameters and environmental factors have on jointseparation capability, the NESC conducted more than 140 tests on a variety of designs and generated more than 100 million lines of data that were used to anchor models, develop design sensitivities, and make reliability estimates. Their comprehensive work was foundational to later assessments for the Space Launch System, Orion, and Launch Services Programs. The NESC also started the FJ Working Group, which serves as the Agency’s technical community of practice. It ensures programs understand the risks associated with their use and is proactive in ensuring NASA is implementing safe and reliable FJ technologies.

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2018-2021
Pilot Breathing Assessment

When the U.S. Navy was experiencing an increase in pilot physiological episodes across their F/A-18 fleet that was leading to mission aborts, “No one really understood what was going on or why,” said Mr. Wilson. “It was a difficult problem, and our NESC team was able to come up with compelling answers.”

Over the NESC’s three-year study, its Pilot Breathing Assessment (PBA) team designed novel instrumentation to measure pilot physiological states and interactions with aircraft life support systems. NASA test pilots flew instrumented NASA F/A-18 and F-15 aircraft through pre-specified flight profiles while wearing specialized breathing equipment augmented with an advanced sensor system. Aligned data streams identified pilot/aircraft interactions with the potential for negative cognitive and physiological impact. After more than 100 scripted flights and 250 million data points, the PBA team determined that breathing pressures and airflows were often mismatched, increasing a pilot’s efforts to maintain sufficient ventilation. The PBA team’s work has benefited the field of aviation and the advancement of human system integration in modern aircraft and has direct application for NASA vehicles such as the T-38, F-15, X-59, and the ISS.

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2020-2023
Unconservatism of LEFM Analysis Post Autofrettage

The NESC has invested significant time and resources to understanding the complex behavior of composite overwrapped pressure vessels (COPV), which are used extensively in space-flight. Most recently, an NESC team found there was a lack of conservatism in the damage tolerance analyses conducted on COPV liners using linear-elastic fracture mechanics (LEFM), particularly in understanding the influence of autofrettage (AF).

During AF, a COPV is subjected to high pressures to compress the inner surfaces, making them less susceptible to operational stresses later. In verifying damage tolerance life, the team found that separating the AF cycle from subsequent elastic cycles in LEFM analysis led to unconservative life predictions. Cracks remained open during compressive cycles after AF and allowed for a larger stress range to contribute to crack growth in each subsequent elastic cycle. The team provided corrections to NASGRO (programs that analyze fracture and fatigue crack growth) to make predictions less unconservative. “I’m convinced that someday crew will fly, come home, disembark, and never know that it was the improvements to those analytical tools made by this NESC team that kept them safe. I think it’s going to have wide-ranging impact.”

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      Arndt, C. and TerMaath, S.: Characterization of the Damage Tolerance of Composite Overlays through Subspace Evaluation. ASCE Engineering Mechanics Institute, Georgia Tech, Atlanta, GA, June 6-9, 2023.  Babuska, P.; Tai, W.; Goyal, V.; and Rodriguez, A.: Novel Test and Analysis Methodology for the Assessment of Joint under Re-entry Environment. AIAA Scitech 2023, National Harbor, MD, January 23-27, 2023.  Bo, D.; Hwangbo, H.; Sharma, V.; Arndt, C.; and TerMaath, S.: A Randomized Subspace-based Approach for Dimensionality Reduction and Important Variable Selection. Journal of Machine Learning Research, 24: 1-3010.48550/arxiv.2106.01584, 2023.  Bo, D.; Hwangbo, H.; and TerMaath, S.: Subspace Selection for High- Dimensional Experiments of Material Development Process. Institute of Industrial & Systems Engineers (IISE) Annual Conference and Expo, New Orleans, LA, May 20-23, 2023.  Brust, F. W.; Punch, E.; Twombly, E.; and Wallace, J: Estimation Scheme for Weld Residual Stress Effect on Crack Opening Displacements. ASME Pressure Vessels and Piping Conference, Paper PVP2023-107396, Atlanta, GA, July 2023.  Cardona, A.; Jegley, D.; and Lovejoy, A.: Manufacturing Trials of Integrally Stiffened Panels for Flight Applications. AIAA-2023-0781, SciTech 2023, National Harbor, MD, January 2023.  Cline, J.; Dorsey, J.; Kang, D.; Doggett, W.; and Allen, D.: Ideas For Infusing In-Space Servicing, Assembly and Manufacturing Concepts into Nuclear Electric Propulsion Architectures. Joint Army-Navy-NASA- Air Force (JANNAF) 12th Spacecraft Propulsion Joint Subcommittee Meeting, Huntsville, AL, December 2022.  Doggett, W.; Heppler, J.; Mahlin, M.; Pappa, R.; Teter, J.; Song, K.; White, B.; Wong, I.; and Mikulas, M.: Towers: Critical Initial Infrastructure for the Moon. AIAA-2023-0383, SciTech 2023, National Harbor, MD, January 2023.  Fleishel, R.; Ferrell, W.; and TerMaath, S.: Fatigue-Damage Initiation at Process Introduced Internal Defects in Electron-Beam-Melted Ti- 6Al-4V. 2023. Metals 13:2, 350. Special Issue: Deformation, Fracture and Microstructure of Metallic Materials, https://doi.org/10.3390/ met13020350.  Fleishel, R. and TerMaath, S.: Modeling fatigue overload behavior in microstructurally short cracks: connecting initiation and long crack behavior. ASCE Engineering Mechanics Institute, Georgia Tech, Atlanta, GA, June 6-9, 2023.  Goyal, V.; Tuck-Lee, J.; Babuska, P.; and Zeitunian, E.: Lessons Learned in the Buckling Assessments of Space Structures. AIAA Scitech 2023, National Harbor, MD, January 23-27, 2023.  Goyal, V.; Sagrillo, C.; Fannon, J.; Forth, S.; and Kezirian, M.: Space Systems Technical Guide for Composite Overwrapped Pressure Vessels. AIAA Scitech 2023, National Harbor, MD, January 23-27, 2023.  Hart, D.; Balsara, Martinez, and TerMaath, S.: Multi-Scale Multi- Physics Bondline Strength Prediction Research. NATO Science & Technology Organization, Applied Vehicle Technology Panel (AVT-361) Research Workshop on Certification of Bonded Repair on Composite Aircraft Structures, Amsterdam, Netherlands, Oct 18-20, 2022.  Kaleel, I., Ricks, T.M., Gustafson, P.A., Pineda, E.J., Bednarcyk, B.A., and Arnold, S.M. (2023) “Massively Multiscale Modeling using NASA Multiscale Analysis Tool through Partitioned Task-Parallel Approach” 2023 AIAA SciTech Forum, 23-27 January 2023, National Harbor, MD.  Lin, L.: Correlation Study of SWOT Payload Acoustic Prediction and Test. AIAA SciTech, January 2023.  Ma, X. and TerMaath, S.: Microstructural Analysis of Intergranular Stress Corrosion Cracking in 5xxx Series Aluminum Reinforced with a Composite Patch. 2023. Advances in the Analysis and Design of Marine Structures. Ringsberg & Guedes Soares (Eds), CRC Press. ISBN 978-1-032-50636-4.  Pak, C.: Linear and Geometrically Nonlinear Structural Shape Sensing from Strain Data. AIAA Journal, Vol. 61, No. 2, 2023, pp. 907-922.  Pak, C.: Finite Element Model Tuning Using Analytical Sensitivity Values. Journal of Aircraft, Articles in Advance (Vol. 60, No. 2 or 3), 2023.  Panda, J.; Nguyen, M.P.; Keil. D.R.; and Hamm, K.R.: A Microphone Phased Array for Launch Acoustics Application. AIAA SciTech Conference, National Harbor, MD, (2023), AIAA Paper 2023-0790.  Qu, X.; Shimizu, L.; Rome J.; Nordendale, N.; and Goyal, V.: Reliability- based Damage Tolerance Analysis for Additive Manufacturing Part. NAFEMS World Congress 2023, Tampa, FL, May 2023.  Ricks, T. M.; Pineda, E. J.; Bednarcyk, B. A.; McCorkle, L. S.; Miller, S. G.; Murthy, P. L.; and Segal, K. N.: Multiscale Progressive Failure Analysis of 3D Woven Composites. 2022, Polymers, 14(20), 4340.  Rome, J. and Goyal, V.: Moving Towards a Print Then Use Framework for Additive Manufacturing. ASME SSDM 2023, June 2023, SSDM2023-111806, Accepted.  Rudd, M.T.; Eberlein, D.J.; Waters, W.A.; Gardner, N.W.; Schultz, M.R.; and Bisagni, C.: Analysis and Validation of a Scaled, Launch- Vehicle-Like Composite Cylinder under Axial Compression. Composite Structures, Volume 304, Part 1, January 2023.  Rudd, M.T.; Schultz, M.R.; Gardner, N.W.; and Bisagni, C.: Test and Analysis of a Composite Conical-Cylindrical Shell. AIAA SciTech 2023 Forum, AIAA paper no. AIAA 2023-1525, National Harbor, MD, January 2023.  Soltz, B.; Goyal, V.; Rome, J.; and Qu, X.: Structural Requirements, Process Simulation, and Residual Stress Characterization for Additively Manufactured Spaceflight Parts. AIAA 2023-2078, https:// doi.org/10.2514/6.2023-2078, AIAA Scitech 2023, National Harbor, MD, January 23-27, 2023.  Soltz, B.; Sivess, A.; Hickman, M.; Ghazari, A. and Shimizu, L.: Static Load Testing and Analysis Recommendations For Space Vehicles. OTR 2023-00653, 33rd Aerospace Testing Seminar, The Aerospace Corporation, May 16, 2023.  Song, K.; Mikulas, M.; Mahlin, M.; and Cassady, J.: Sizing and Design Tool for Tall Lunar Tower. AIAA-2023-0382, SciTech 2023, National Harbor, MD, January 2023.  Hammel, J.: Utilizing 3D-DIC on the Mars 2020 Rover Wheel Assembly: Test-Analysis Correlation. IEEE, March 2023.  Song, K.; Stark, A.; Amundsen, R.; Mikulas, M.; Mahlin, M.; and Cassady, J.: Sizing, Buckling, and Thermal-Structural Analysis of Tall Lunar Tower. 2023 AIAA ASCEND, Las Vegas, NV, October 2023.  TerMaath, S.: Multi-scale Computational Structural Mechanics. Turing- Oden Workshop on Data Science and Machine Learning. Alan Turing Institute, London, January 25-27, 2023.  TerMaath, S.; Crusenberry, C.; and Arndt, C.: Reduced Order Modeling of Progressive Failure in Composite/Metal Structure. 6th International Conference on Protective Structures, Auburn University, May 14-17, 2023.  TerMaath, S.: Probabilistic multi-scale characterization and prediction of bimaterial bondline structural reliability. Canadian National Research Council, Ottawa, June 1, 2023.  TerMaath, S.; Ingling, B.; Noland, J.; and Hart, D.: Evaluation of low-velocity impact damage in metal/composite layered structure. 8th International Symposium on Life-Cycle Civil Engineering (IALCCE). Milano, Italy, July 2-6, 2023.  Twombly, E.; Hill, L.; Wilkowski, G.; Brust, B.; Lin, B.; and Tregoning, R.: Evaluation of the Inherent LBB Behavior of Small-Diameter Class 1 and 2 Nuclear Piping Systems. ASME Pressure Vessels and Piping Conference, Paper PVP2023-107685, Atlanta, GA, July 2023.  Ytuarte, E.; Ragheb, H.; Sobey, A.; and TerMaath, S.: Peridynamics with stochastic bond strengths for determination of final failure in composite laminates. ASCE Engineering Mechanics Institute, Georgia Tech, Atlanta, GA, June 6-9, 2023.2022, Park City, UT. Systems Engineering
      Driscoll, A. and Vining, G.: Debunking Stress Rupture Theories Using Weibull Regression Plots. Fall Technical Conference, October 12-14, 2022, Park City, UT  Driscoll, A.: Advances in Stress Rupture Modeling: A Case Study for Predicting COPV Reliability. Joint Statistical Meetings, August 5-10, 2023, Toronto, Canada.  Huang, Z. C.: Toward Closed Form Formulas for System Reliability and Confidence Quantification. 2023 Annual Reliability and Maintainability Symposium (RAMS), January 23-26, 2023, DOI: 10.1109/RAMS51473.2023.10088214.  Parker, P. and Wilson, S.: Motivating Statistical Research for NASA Applications. Joint Statistical Meetings, August 5-10, 2023, Toronto, Canada.  Thermal Control and Protection 
      Rickman, S.: Re-Architecting the NASA Wire Derating Approach, Phase II, Wire and Wire Bundle Ampacity Testing and Analysis. Aerospace Electrical Interconnect Symposium, October 2022, Houston, TX.  Rickman, S.: Space Mission Thermal Control and Protection Challenges – Past, Present, and Future. The Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm), June 2023, Orlando, FL.  Rickman, S.: Introduction to Orbits. Rice/Envision Aerospace and Aviation Academy, June 2023, Houston, TX.  Rickman, S.: Development and Application of a Novel Calorimetry Technique for the Study of Lithium-Ion Cell Thermal Runaway., International Conference on Environmental Systems (ICES), July 2023, Calgary, Canada.  Rickman, S.: Introduction to On-Orbit Thermal Environments. Thermal and Fluids Analysis Workshop (TFAWS), August 2023, College Park, MD.  Shafirovich, E. and Rickman, S.: A Warm Garage for a Lunar Rover, Commercial Lunar Payload Services. Survive the Night Technology Workshop, December 2022, Cleveland, OH.  View the full article
    • By NASA
      NESC Honor Awards are given each year to NASA employees, industry representatives, and other stakeholders for their efforts and achievements in engineering, leadership, teamwork, and communication. These awards formally recognize those who have made outstanding contributions to the NESC mission, demonstrate engineering and technical excellence, and foster an open environment. 
      2022 Honorees from left to right: (Front Row) Tim Wilson (NESC Director); Yuan Chen (LaRC), Elspeth Peterson (KSC), Grace Belancik (ARC), Jing Pei (LaRC), Mark Vande Hei (NESC Chief Astronaut); (Second row) James Walker (MSFC), Carlton Faller (JSC), Jason Vaughn (MSFC), Shane Cravens (Syncom Space Services, SSC), Shawn Brechbill (MSFC), Kevin Dickens (GRC); (Third row) Christopher Johnston (LaRC).   NESC Director’s Award 
      Honors individuals for defending a technical position that conflicts with a program or organization’s initial or prevailing engineering perspectives and for taking personal initiative to foster clear and open communication and resolve controversial issues. 
      DANIEL L. DIETRICH – In recognition of the development and advocacy of the technical rationale to assess the safety and effectiveness of breathing systems for pilots of tactical aircraft. 

      NESC Leadership Award 
      Honors individuals for sustained leadership excellence demonstrated by establishing a vision, developing and managing a plan, and building consensus to proactively resolve conflicts and achieve results. 
      YUAN CHEN – In recognition of outstanding leadership in  the electrical, electronic, electromechanical parts’ community and the development of recommendations on the use of commercial parts in NASA missions. 
      NIKOLAUS GRAVENSTEIN – In recognition of outstanding technical leadership in support of Verification of Testing Standard for Carbon Dioxide (CO2) Partial Pressure in Extravehicular Activity Suits. 
      ELSPETH M. PETERSEN – In recognition of outstanding leadership to the Spacesuit Water Membrane Evaporator Assessment Team in negotiating creative solutions and facility challenges. 
      PATRICK A. SIMPKINS – In recognition of outstanding technical leadership in support of numerous NESC assessments to reduce risk to NASA’s most critical human and robotic spaceflight programs. 

      NESC Engineering Excellence Award 
      Honors individuals for making significant engineering contributions, developing innovative approaches, and ensuring appropriate levels of engineering rigor are applied to the resolution of technical issues in support of the NESC mission. 
      KEVIN W. DICKENS – In recognition of engineering excellence and sustained commitment to the NESC Propulsion Technical Discipline Team and NASA missions. 
      View the full article
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