Advanced Diagnostics and Analysis provides ultrasonic inspection, materials and failure analysis, and real-time process sensing for metal additive manufacturing — expert diagnostics grounded in deep research roots at Georgia Tech.
Services
From a single failed component to qualifying a new manufacturing process, ADA works at the point where measurement meets interpretation — not just collecting data, but explaining what it means and what to do next.
Detection, localization, and sizing of internal defects in dense metals and critical structures — cracks, voids, inclusions, and wall loss — without cutting the part open. Includes inspection planning, scan design, and interpretation of results against acceptance criteria.
When a component fails — or shows damage earlier than it should — ADA traces the evidence: corrosion pitting, fatigue cracking, manufacturing anomalies, and service-induced degradation, and reports the mechanism, not just the symptom.
Quality assurance for laser powder bed fusion (L-PBF) and other metal AM processes: in-situ sensing that catches defects as each layer is built, plus post-build inspection strategies for dense, high-value parts.
Modern inspection generates more data than any reviewer can read by eye. ADA develops and validates machine-learning models that detect and quantitatively size defects in ultrasonic and sensor data — with the physics kept in the loop, so results stay explainable and auditable.
Focus · Metal Additive Manufacturing
In laser powder bed fusion, a defect formed in one layer is buried by the next. Multi-sensor in-situ sensing — optical, acoustic, and thermal signals fused in real time — flags anomalies layer by layer, long before post-build inspection.
Research
ADA's consulting rests on active research — published methods, honestly validated, rather than black-box tools.
ULTRASONICS × DEEP LEARNING
Back-wall corrosion pits are among the hardest defects to size ultrasonically: the returning signal is weak, distorted, and easy to confuse with geometry. ADA's research applies deep learning directly to ultrasonic B-scan data to detect pits and estimate their radius and depth quantitatively — turning a qualitative "something is there" into numbers an integrity engineer can act on.
Validation is treated as part of the method: cross-checked datasets, noise and robustness testing, and comparison against physics-based baselines.
IN-SITU ANOMALY DETECTION
No single sensor sees every defect mechanism in metal 3D printing. ADA's work fuses complementary signals — melt-pool imaging, acoustic emission, and thermal data — to detect process anomalies as they occur and connect each signature to the defect it leaves behind.
ADA presents this work internationally, including invited seminars at Hanyang University and industry talks in Korea in the fall of 2026.
WAAM × MULTI-OBJECTIVE BAYESIAN OPTIMIZATION
Wire arc additive manufacturing (WAAM) of Ti-6Al-4V by robotic GMAW has a wide, interacting process space — wire feed rate, travel speed, arc power, inter-pass temperature, build strategy, shielding, and more. ADA's framework optimizes three competing objectives at once: minimize porosity (f₁), maximize ultimate tensile strength (f₂), and minimize residual stress magnitude (f₃), measured across three build directions (0°, 45°, 90°) by X-ray CT, tensile testing, and XRD.
Because each WAAM build takes hours, the search is driven by multi-objective Bayesian optimization: Gaussian-process surrogates with quantified uncertainty and an EHVI acquisition function choose each next experiment, converging on the Pareto front — and a qualified process window — in roughly 50–70 builds instead of exhaustive trial and error.
HYBRID ADDITIVE MANUFACTURING × WELDING × NDE
Some parts are too large and too complex for any single process. This case study redesigns a Ti-6Al-4V bulkhead — today a ~3,000 kg forging, 1.7 m high by 4 m wide, with dual engine-bay cutouts and complex rib-and-pocket geometry — as a hybrid build: additive manufacturing where the geometry demands it, welding to join the sections, and CNC machining to finish. The projected result is a 60% cost reduction versus forging plus machining.
The plan is zone by zone: WAAM with CNC finishing for the web and ribs, L-PBF with HIP for the fatigue-critical engine bay rings, and WAAM with inter-layer rolling for the outer rim — joined primarily by electron beam welding, with laser beam welding as a strong alternative. Each zone and weld then gets its own NDE plan, built around phased-array ultrasonics and TOFD, with target detectable defect sizes down to 0.3 mm.
NONLINEAR ULTRASONICS × PROGNOSIS
Nonlinear ultrasound tracks the distortion that damaged material imparts on a propagating wave, which makes it sensitive to microstructure evolution such as dislocation substructures, precipitates and microcracks.
This lets it quantify damage accumulating during fatigue, creep and thermal degradation long before cracks or macroscopic damage form, supporting the prognosis of critical components and the prediction of their remaining life.
About
Advanced Diagnostics and Analysis is an engineering practice built on research roots at the Georgia Institute of Technology, where work in Mechanical Engineering on ultrasonic wave propagation, nondestructive evaluation, and sensing for advanced manufacturing ran from 2004 to 2026.
ADA's engineers and scientists work across the full arc of a diagnostic problem: how waves and sensors interact with real, imperfect materials; how to extract a defect's size and severity from noisy signals; and how deep learning can do that extraction reliably enough for engineering decisions.
The team handles measurement, interpretation, and reporting together — so every finding can be explained, documented, and defended by the people who produced it.
Previous Sponsors: KAERI, KINS, BEES, Corning, EPRI, and local NDE companies
Describe the part, the problem, and what decision the answer has to support.
A scoped inspection or analysis plan — method, data needed, and what the results will and won't show.
Measurement and interpretation, with defect calls and sizing documented so another expert can follow them.
A written report with findings and recommendations — and a call to walk through them.
Publications & Patents
Three decades of peer-reviewed work in nonlinear ultrasonics, nondestructive evaluation, and materials characterization — the research base ADA's consulting is built on.
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A. Ruiz and J.-Y. Kim, “Nondestructive evaluation of thermal embrittlement in duplex stainless steels: Review and comparison of multiple techniques,” Research in Nondestructive Evaluation, 2026. doi:10.1080/09349847.2026.2713219
J.-Y. Kim and E. Ahn, “Velocity of ultrasonic diffusion in strongly heterogeneous media: Further insights,” Ultrasonics 168, 108232, 2026.
J.-Y. Kim and H. Sohn, “Editorial: Non-Destructive Testing of Civil Engineering Materials and Structures,” Nondestructive Testing and Evaluation 41(7), pp. 4007–4008, 2026.
H.M. Carius, P.B. Nagy, J. Wang, J.-Y. Kim, and L.J. Jacobs, “An experimental evaluation of non-collinear shear wave mixing to characterize interface nonlinearity,” NDT & E International 162, 103742, 2026.
J. Wang, H.M. Carius, P.B. Nagy, J.-Y. Kim, and L.J. Jacobs, “Single-sided non-collinear shear wave mixing for material characterization,” Applied Physics Letters 128, 02201, 2026.
E. Ahn, S. Lee, and J.-Y. Kim, “Estimating depth of surface cracks in concrete using theoretical ultrasonic diffuse energy velocity,” Journal of Nondestructive Evaluation 45, #14, 2026.
J. Wang, P.B. Nagy, H.M. Carius, J.-Y. Kim, and L.J. Jacobs, “Analytical and numerical modeling of non-collinear wave mixing due to material and interface nonlinearity,” Journal of the Acoustical Society of America 158(4), pp. 3210–3225, 2025.
D. Kumar, J.-Y. Kim, C. Fjeran, L. Stewart, K.E. Kurtis, and L.J. Jacobs, “Ultrasound non-collinear wave mixing to detect internal alkali-silica reaction in large-scale concrete,” Materials and Structures 58, 138, 2025.
J.-Y. Kim, “Flexural mode NRUS: Theory,” Ultrasonics 154, 107669, 2025.
D. Herberger, J.-Y. Kim, and L.J. Jacobs, “Evaluating effects of porosity and texture on elastic anisotropy of laser powder bed fusion 316L stainless steel using nondestructive ultrasonic techniques,” Journal of the Acoustical Society of America 157(3), pp. 2018–2028, 2025.
J.-Y. Kim, “Velocity of ultrasonic diffusion in heterogeneous media and its applications,” Ultrasonics 145, 107476, 2025.
J.W. Hu, J. Kim, and J.-Y. Kim, “Nonlinear resonant bar of approximate Ramberg-Osgood type modulus defect,” Mechanical Systems and Signal Processing 223, 111838, 2025.
E. Evans, K. Bhat, J.-Y. Kim, A. Stebner, L.J. Jacobs, and B. Kappes, “Benchmarking ultrasonic and radiographic nondestructive evaluation methods for high-temperature composites,” Journal of DoD Research and Engineering 7, 4, 2024.
E. Guerra-Bravo, A. Baltazar, and J.-Y. Kim, “On the SH0 directivity of an array with flexible PZT transducers for beam steering control,” Physica Scripta 99, 105022, 2024.
A. Bellotti, J.-Y. Kim, D. VanderLaan, and L.J. Jacobs, “Phased array based nonlinear wave mixing technique: Application to lack-of-fusion porosity characterization in additively manufactured metals,” Journal of the Acoustical Society of America 156(2), pp. 1081–1090, 2024.
S. Paek, G. Kim, and J.-Y. Kim, “Nonlinear standing waves for assessing material nonlinearity in thin samples,” Ultrasonics 142, 107385, 2024.
A. Ruiz, V. M. Rodríguez, H. Granados-Becerra, and J.-Y. Kim, “Ultrasonic characterization of microstructural changes due to static recrystallization and grain growth in Inconel 625 and Inconel 718 superalloy,” Ultrasonics 142, 107383, 2024.
A. Ruiz and J.-Y. Kim, “Experimental contact acoustic nonlinearity of interfaces during loading-unloading cycle: Combined effects of elastoplastic nonlinear spring, crack-clapping and adhesion,” Journal of Nondestructive Evaluation 43, Article #76, 2024.
F. Weiss, J.-Y. Kim, K.E. Kurtis, D. VanderLaan, C. Tenorio, and L.J. Jacobs, “Experimental study on the nonlinear mixing of ultrasonic waves in concrete using an array technique,” NDT&E International 143, 103054, 2024.
F. Gmeiner, J.-Y. Kim, F. Wang, and L.J. Jacobs, “Nonlinear ultrasonic techniques to quantify oxidation damage in carbon/carbon composite material,” NDT&E International 140, 102966, 2023.
M. Schimitz, J.-Y. Kim, and L.J. Jacobs, “Machine and deep learning for coating thickness prediction using Lamb waves,” Wave Motion 120, 103137, 2023.
B. Fuchs, J.-Y. Kim, A. Ruiz, V. M. Rodriguez-Herrejon, and L.J. Jacobs, “Modeling the relative contribution of matrix dislocations and M23C6 coarsening to acoustic nonlinearity in 9Cr-1Mo stainless steel,” Journal of Nondestructive Evaluation 42:25, 2023.
S. Gwon, E. Ahn, M. Shin, J.-Y. Kim, and G. Kim, “Assessment of internal curing of cellulose microfibers-incorporated cement composites using destructive and nondestructive methods,” Construction and Building Materials 352, 129004, 2022.
J.-Y. Kim, A. Bellotti, P. Alapati, K.E. Kurtis, J. Qu, and L.J. Jacobs, “Use of a non-collinear wave mixing technique to image internal microscale damage in concrete,” Journal of Applied Physics 131, 145102, 2022.
A. Paul, M. Rashidi, J.-Y. Kim, L.J. Jacobs, and K.E. Kurtis, “The impact of sulfate- and sulfide-bearing sand on delayed ettringite formation,” Cement and Concrete Composites 125, 104323, 2022. doi:10.1016/j.cemconcomp.2021.104323
B. Fuchs, J.-Y. Kim, and L.J. Jacobs, “Precipitation modeling for prediction of the evolution of acoustic nonlinearity in an iron–copper alloy,” NDT&E International, 2022. doi:10.1016/j.ndteint.2022.102606
B. Fuchs, J. Qu, J.-Y. Kim, K.A. Unocic, Q. Guo, P. Ramuhalli, and L.J. Jacobs, “Analytical modeling of the evolution of the nonlinearity parameter of sensitized stainless steel,” Journal of Applied Physics 130, 165102, 2021. doi:10.1063/5.0053632
V.M. Rodriguez-Herrejon, A. Ruiz, C. Rubio-Gonzalez, V.H. Lopez-Morelos, J.-Y. Kim, and L.J. Jacobs, “Nonlinear surface wave measurements on aged and laser shock surface-treated Inconel 718 superalloy,” NDT&E International 121, 102457, 2021.
G. Gutierrez-Vargas, A. Ruiz, V.H. Lopez, J.-Y. Kim, J. González-Sánchez, and A. Gonzales-Sanchez, “Evaluation of 475 °C embrittlement in UNS S32750 super duplex stainless steel using four-point electric conductivity measurements,” Nuclear Engineering and Technology 53(9), pp. 2982–2989, 2021.
K. M. S. Levy, J.-Y. Kim, and L.J. Jacobs, “Development of a comparison model between second harmonic generation and nonlinear resonant ultrasound spectroscopy to improve material characterization,” Materials Evaluation 79(5), pp. 461–467, 2021.
J.-Y. Kim, J.J. Wall, F.A. Garner, and L.J. Jacobs, “Use of combined linear and nonlinear ultrasound to examine microstructural and microchemical variations in highly irradiated 304 stainless steel,” Journal of Nuclear Materials 545, 152544, 2021.
K. Fernandez-Ramirez, A. H. Baltazar, and J.-Y. Kim, “Chaotic search algorithm for detection of discontinuities using guided waves and beamforming data,” Measurement Science and Technology 32, 035105, 2021.
A. Bellotti, J.-Y. Kim, J.E. Bishop, B. H. Jared, K. Johnson, D. Susan, P.J. Noell, and L.J. Jacobs, “Nonlinear ultrasonic technique for the characterization of microstructure in additive materials,” Journal of the Acoustical Society of America 149(1), pp. 159–166, 2021.
K. M. S. Levy, J.-Y. Kim, and L.J. Jacobs, “Investigation of the relationship between classical and nonclassical ultrasound nonlinearity parameters and microstructural mechanisms in metals,” Journal of the Acoustical Society of America 148(4), pp. 2429–2437, 2020.
Y.-A. Lai, J.-Y. Kim, C.-S. W. Yang, and L.-L. Chung, “A low-cost and efficient d33-mode piezoelectric tuned mass damper with simultaneously optimized electrical and mechanical tuning,” Journal of Intelligent Material Systems and Structures 32(6), pp. 678–698, 2020.
D.N. Fahse, K.M.S. Levy, J.-Y. Kim, and L.J. Jacobs, “Comparison of changes in nonclassical (α) and classical (β) acoustic nonlinear parameters due to thermal aging of 9Cr-1Mo ferritic martensitic steel,” NDT&E International 110, 102226, 2020.
D. Pfeifer, J.-Y. Kim, and L.J. Jacobs, “Nonlinear Rayleigh waves to evaluate plasticity damage in X52 pipeline material,” Mechanical Systems and Signal Processing 143, 106794, 2020.
J.-Y. Kim, J.J. Wall, Y.-S. Joo, D.-G. Park, and L.J. Jacobs, “Device and method for nonlinear ultrasonic measurements on highly irradiated 304 stainless steel specimens in a hot cell environment,” Review of Scientific Instruments 91(2), 025103, 2020.
B.-C. Kim, J. Chen, and J.-Y. Kim, “Relation between crack density and acoustic nonlinearity in thermally damaged sandstone,” International Journal of Rock Mechanics and Mining Sciences 125, 104171, 2020.
G. Gutierrez-Vargas, A. Ruiz, J.-Y. Kim, V.H. Lopez, and R.R. Ambriz, “Evaluation of thermal embrittlement in 2507 super duplex stainless steel using thermoelectric power,” Nuclear Engineering and Technology 51, pp. 1816–1821, 2019.
J.-Y. Kim, J. Jang, and T.-S. Yun, “Effect of input signal type and time delay in sensors on wave velocity in rock specimens,” Engineering Geology 260, #105225, 2019.
G. Kim, S. Park, J.-Y. Kim, K.E. Kurtis, N.W. Hayes, and L.J. Jacobs, “Nonlinear Rayleigh surface waves to characterize microscale damage due to alkali-silica reaction (ASR) in full-scale, nuclear concrete specimens,” Construction and Building Materials 186, pp. 1114–1118, 2018.
G. Kim, G. Loreto, J.-Y. Kim, J.J. Wall, K.E. Kurtis, and L.J. Jacobs, “In situ nonlinear ultrasonic technique for monitoring in concrete subjected to creep and cyclic loading,” Ultrasonics 88, pp. 64–71, 2018.
S. Maier, J.-Y. Kim, M. Forstenhausler, J.J. Wall, and L.J. Jacobs, “Noncontact nonlinear resonance ultrasound spectroscopy (NRUS) for small metallic specimens,” NDT&E International 98, pp. 37–44, 2018.
K. Scott, J.-Y. Kim, and L.J. Jacobs, “Signal processing methods for second harmonic generation in thin specimens,” NDT&E International 98, pp. 57–64, 2018.
G. Gutierrez-Vargas, A. Ruiz, and J.-Y. Kim, “Characterization of thermal embrittlement in 2507 super duplex stainless steel using nonlinear acoustic effects,” NDT&E International 94, pp. 101–108, 2018.
C.-S. W. Yang, Y.-A. Lai, and J.-Y. Kim, “A piezoelectric brace for passive suppression of structural vibration and energy harvesting,” Smart Materials & Structures 26, #085005, 2017.
G. Kim, E. Giannini, N. Klenke, J.-Y. Kim, K. E. Kurtis, and L. J. Jacobs, “Monitoring of alkali-silica reaction (ASR) damage in a large-scale concrete slab using nonlinear Rayleigh surface waves,” Journal of Nondestructive Evaluation 36, Article #29, 2017.
D.-G. Park, M.B. Kishore, D.H. Lee, J.-Y. Kim, G. Vertesy, and S. Derac, “A study of microstructural analysis for nondestructive evaluation of thermal ageing using magnetic properties,” NDT&E International 89, pp. 14–18, 2017.
D. Torello, N. Shelby, J.-Y. Kim, J.J. Wall, J. Qu, and L.J. Jacobs, “Determination of absolute material nonlinearity with air-coupled ultrasonic receivers,” Ultrasonics 81, pp. 107–117, 2017. (Also appeared in Virtual Issue of Ultrasonics on Air-coupled Ultrasound)
C. Doerr, J.-Y. Kim, P. Singh, J.J. Wall, and L.J. Jacobs, “Evaluation of sensitization in stainless steel 304 and 304L using nonlinear Rayleigh waves,” NDT&E International 88, pp. 17–23, 2017.
M. Rashidi, A. Paul, J.-Y. Kim, and K.E. Kurtis, “Insights into delayed ettringite formation damage through acoustic nonlinearity,” Cement and Concrete Research 95, pp. 1–8, 2017.
K. Scott, J.-Y. Kim, J.J. Wall, D.-G. Park, and L.J. Jacobs, “Investigation of Fe-1.0% Cu surrogate specimens with nonlinear ultrasound,” NDT&E International 89, pp. 40–43, 2017.
C. Doerr, A. Lakocy, J.-Y. Kim, P.M. Singh, J.J. Wall, J. Qu, and L.J. Jacobs, “Evaluation of the heat-affected zone (HAZ) of a weld joint using nonlinear Rayleigh waves,” Materials Letters 190, pp. 221–224, 2017.
S.-H. Chong and J.-Y. Kim, “Nonlinear vibration analysis of the resonant column test of granular materials,” Journal of Sound and Vibration 393, pp. 216–228, 2017.
C.W. In, K. Arne, J.-Y. Kim, and K.E. Kurtis, “Estimation of crack depth in concrete using diffuse ultrasound – Validation on real cracks in a concrete beam,” Journal of Nondestructive Evaluation 36, Article #3, 2017.
G. Kim, J.-Y. Kim, K. E. Kurtis, and L. J. Jacobs, “Drying shrinkage in concrete assessed by nonlinear ultrasound,” Cement and Concrete Research 92, pp. 16–20, 2017.
J. Chen, Z. Xu, J.-Y. Kim, Y. Yu, and Y. Yao, “Characterization of thermal damage in sandstone using a nonlinear ultrasonic method,” International Journal of Rock Mechanics and Mining Sciences 91, pp. 81–89, 2017.
M. Rashidi, M.C. Knapp, A. Hashemi, J.-Y. Kim, K. Donnell, R. Zoughi, K.E. Kurtis, and L.J. Jacobs, “Detecting alkali-silica reaction: a multi-physics approach,” Cement & Concrete Composites 73, pp. 123–135, 2016.
D.G. Park, M.B. Kishore, J.-Y. Kim, and D.H. Lee, “Detection of corrosion and wall thinning in carbon steel pipe covered with insulation using pulsed eddy current,” Journal of Magnetics 21, pp. 57–60, 2016.
J.-Y. Kim, C.-W. In, K.-H. Sun, J.S. Song, and J.H. Lee, “Imaging defects in laminate composite plates using focused shear waves generated by air-coupled transducer,” Composite Structures 152, pp. 891–899, 2016.
H.-S. Kwon and J.-Y. Kim, “An analytical filter design method for two-dimensional guided wave transducer arrays,” Mechanical Systems and Signal Processing 81, pp. 433–446, 2016.
S. Chen, X. Dong, J.-Y. Kim, S. Wu, and Y. Wang, “Design and performance validation of a compact wireless ultrasonic device for localized damage detection,” Advances in Structural Engineering 19, pp. 270–282, 2016.
A. Romer, J.-Y. Kim, J. Qu, and L.J. Jacobs, “The second harmonic generation in reflection mode – an analytical, numerical, and experimental study,” Journal of Nondestructive Evaluation 35, Article #6, 2016.
G. Kim, J.-Y. Kim, K.E. Kurtis, Y. Pape, and M. Guimaraes, “Quantitative evaluation of carbonation in concrete using nonlinear ultrasound,” Materials and Structures 49(1), pp. 399–409, 2016. (Selected as an Outstanding Paper of the Journal)
D. Marino, J.-Y. Kim, A. Ruiz, Y.-S. Joo, and J. Qu, “Using nonlinear ultrasound to track microstructural changes in modified 9% Cr ferritic martensitic steel,” NDT&E International 79, pp. 46–52, 2016.
M.B. Kishore, D.G. Park, J.R. Jeong, J.-Y. Kim, L.J. Jacobs, and D.H. Lee, “Detection of deep subsurface cracks in thick stainless-steel plate,” Journal of Magnetics 20, pp. 312–316, 2015.
A. Carreon, A. Baltazar, and J.-Y. Kim, “Determination of contact evolution on a soft hemi-spherical probe using ultrasound,” IEEE Sensor Journal 15, pp. 5303–5311, 2015.
M. Morlock, J.-Y. Kim, J. Qu, and L.J. Jacobs, “Mixing of two co-directional Rayleigh surface waves in nonlinear elastic materials,” Journal of the Acoustical Society of America 137, pp. 281–292, 2015.
K.H. Matlack, J.-Y. Kim, J. Qu, and L.J. Jacobs, “Review of second harmonic generation measurement techniques for material state determination in metals,” Journal of Nondestructive Evaluation 34, Article #273, 2015.
K.H. Matlack, H.A. Bradley, S. Thiele, J.-Y. Kim, J.J. Wall, H.J. Jung, J. Qu, and L.J. Jacobs, “Nonlinear ultrasonic characterization of precipitation in 17-4PH stainless steel,” NDT&E International 71, pp. 8–15, 2015.
C.W. In, F. Schempp, J.-Y. Kim, and L.J. Jacobs, “A fully non-contact air-coupled ultrasonic measurement of surface breaking cracks in concrete,” Journal of Nondestructive Evaluation 34, Article #272, 2015.
D. Torello, S. Thiele, K.H. Matlack, J.-Y. Kim, J. Qu, and L.J. Jacobs, “Diffraction, attenuation, and source corrections for nonlinear Rayleigh wave ultrasonic measurements,” Ultrasonics 56, pp. 417–426, 2014. (Also appeared in Virtual Issue of Ultrasonics on Air-coupled Ultrasound)
K.H. Matlack, J.-Y. Kim, J. Wall, J. Qu, and L.J. Jacobs, “Nonlinear ultrasonic characterization of radiation damage using Charpy impact specimen,” Journal of ASTM, STP 1576, pp. 1–17, 2014.
G. Kim, C.W. In, J.-Y. Kim, K.E. Kurtis, and L.J. Jacobs, “Air-coupled detection of nonlinear Rayleigh waves in concrete – Applications to microcracking detection,” NDT&E International 67, pp. 64–70, 2014.
S. Thiele, J.-Y. Kim, J. Qu, and L.J. Jacobs, “Air-coupled detection of nonlinear Rayleigh surface waves to assess material nonlinearity,” Ultrasonics 54, pp. 1470–1475, 2014. (Also appeared in Virtual Issue of Ultrasonics on Air-coupled Ultrasound)
K.H. Matlack, J.-Y. Kim, J. Wall, J. Qu, L.J. Jacobs, and M.A. Sokolov, “Sensitivity of ultrasonic nonlinearity to irradiated, annealed, and re-irradiated microstructure changes in RPV steels,” Journal of Nuclear Materials 448, pp. 26–32, 2014.
D. Zeitvogel, K.H. Matlack, J.-Y. Kim, L.J. Jacobs, P.M. Singh, and J. Qu, “Characterization of stress corrosion cracking in carbon steel using nonlinear Rayleigh surface waves,” NDT&E International 62, pp. 144–152, 2014.
K.J. Lesnicki, J.-Y. Kim, K.E. Kurtis, and L.J. Jacobs, “Erratum to: Assessment of alkali-silica reaction damage through quantification of concrete nonlinearity,” Materials and Structures 46, p. 511, 2013.
H.-S. Kwon, S.-S. Lee, and J.-Y. Kim, “Beam pattern improvement by compensating array nonuniformities in a guided wave phased array,” Smart Materials & Structures 22, 085002 (10 pages), 2013.
C. In, R. B. Holland, J.-Y. Kim, K. E. Kurtis, L. F. Kahn, and L. J. Jacobs, “Quantitative monitoring of self-healing in concrete using diffuse ultrasound,” NDT&E International 57, pp. 36–44, 2013. (Also appeared in Virtual Special Issue of NDT&E International on “Civil structures and materials towards practical assessment of roads and bridges”)
K.J. Lesnicki, J.-Y. Kim, K.E. Kurtis, and L.J. Jacobs, “Assessment of alkali-silica reaction damage through quantification of concrete nonlinearity,” Materials and Structures 46, pp. 497–509, 2013.
M. Seher, C. In, J.-Y. Kim, L.J. Jacobs, and K.E. Kurtis, “Numerical and experimental study of crack depth measurements in concrete using diffuse ultrasound,” Journal of Nondestructive Evaluation 32, pp. 81–92, 2013.
F. Bender, J.-Y. Kim, L.J. Jacobs, and J. Qu, “Generation of second harmonic in obliquely incident elastic waves at a free surface,” Wave Motion 50, pp. 146–161, 2013.
N.O. Lara, A. Ruiz, A. Medina, J.-Y. Kim, and L.J. Jacobs, “Application of ultrasonic methods for early detection of thermal aging in 2205 duplex stainless steel,” NDT&E International 54, pp. 19–26, 2013. (Selected as a Highly Cited Research in 2014–2016 by Elsevier Publishing Company)
Y.-S. Joo, J.-H. Bae, J.-B. Kim, and J.-Y. Kim, “Effects of beryllium coating layers on performance of the ultrasonic waveguide sensor,” Ultrasonics 53, pp. 387–395, 2013.
K. H. Matlack, J. Wall, J.-Y. Kim, J. Qu, L.J. Jacobs, and H.-W. Viehrig, “Evaluation of radiation damage using nonlinear ultrasound,” Journal of Applied Physics 111, 054911, 2012.
Y. Liu, J.-Y. Kim, L.J. Jacobs, J. Qu, and Z. Li, “Experimental investigation of symmetry properties of second harmonic Lamb waves,” Journal of Applied Physics 111, 053511, 2012.
S.V. Walker, J.-Y. Kim, L.J. Jacobs, and J. Qu, “Fatigue damage evaluation in A36 steel using nonlinear Rayleigh surface waves,” NDT&E International 48, pp. 10–15, 2012.
J.-Y. Kim, Z. Li, and A. Baltazar, “Pyroelectric and pyromagnetic coefficients of functionally graded multilayered multiferroic composites,” Acta Mechanica 223, pp. 846–860, 2012.
J. Chen, J.-Y. Kim, K.E. Kurtis, and L.J. Jacobs, “Theoretical and experimental study of the nonlinear resonance vibration of cementitious materials with an application to damage characterization,” Journal of the Acoustical Society of America 130(5), pp. 2728–2737, 2011.
K.J. Lesnicki, J.-Y. Kim, K.E. Kurtis, and L.J. Jacobs, “Characterization of ASR damage in concrete using nonlinear impact resonance acoustic spectroscopy technique,” NDT&E International 44, pp. 721–727, 2011.
D.P. Schurr, J.-Y. Kim, K.G. Sabra, and L.J. Jacobs, “Damage detection in concrete using coda wave interferometry,” NDT&E International 44, pp. 728–735, 2011.
J.-Y. Kim, “Micromechanical analysis of effective properties of magneto-electro-thermo-elastic multilayer composites,” International Journal of Engineering Science 49, pp. 1011–1028, 2011.
K. H. Matlack, J.-Y. Kim, L.J. Jacobs, and J. Qu, “Experimental characterization of efficient second harmonic generation of Lamb waves in a nonlinear elastic plate,” Journal of Applied Physics 109(1), 014905 (5 pages), 2011.
M. Liu, J.-Y. Kim, L.J. Jacobs, and J. Qu, “Experimental study of nonlinear Rayleigh wave propagation in shot-peened aluminum plates — Feasibility of measuring residual stresses,” NDT&E International 44, pp. 67–74, 2011.
A. Pertsch, J.-Y. Kim, Y. Wang, and L.J. Jacobs, “An intelligent stand-alone ultrasonic device for monitoring local damage growth in civil structures,” Smart Materials & Structures 20, 015022 (13 pages), 2011.
R.M. Kmack, K.E. Kurtis, L.J. Jacobs, and J.-Y. Kim, “Characterization of air voids in fresh cement paste through ultrasonic nondestructive testing,” Journal of ASTM International 7(1), Paper ID: JAI102452, 2010.
M. Treiber, J.-Y. Kim, L.J. Jacobs, and J. Qu, “Effects of sand aggregate on ultrasonic attenuation in cement-based materials,” Materials and Structures 43(s1), pp. 1–11, 2010.
J. Chen, A. Jayapalan, J.-Y. Kim, K.E. Kurtis, and L.J. Jacobs, “Rapid evaluation of alkali-silica reactivity using a nonlinear resonance spectroscopy,” Cement and Concrete Research 40(5), pp. 914–923, 2010.
J.-Y. Kim and J.-S. Lee, “Extinction cross-section for elastic wave scattering in energy-absorbing media: revisited (Acta Mechanica 207, pp. 156–161, 2009),” Acta Mechanica 211(3–4), pp. 357–359, 2010.
J.-Y. Kim, “Effective medium theories for wave propagation in two-dimensional random composites,” Journal of Mechanics of Materials and Structures 5(4), pp. 567–581, 2010.
F. Deroo, J.-Y. Kim, J. Qu, K. Sabra, and L.J. Jacobs, “Detection of damage in concrete using diffuse ultrasound,” Journal of the Acoustical Society of America 127(6), pp. 3315–3318, 2010.
J.-Y. Kim, “Models for wave propagation in two-dimensional random composites,” Journal of the Acoustical Society of America 127(4), pp. 2201–2209, 2010.
M. F. Mueller, J.-Y. Kim, J. Qu, and L.J. Jacobs, “Characteristics of second harmonic Lamb waves in a nonlinear elastic plate,” Journal of the Acoustical Society of America 127(4), pp. 2141–2153, 2010.
J.-Y. Kim and S.I. Rokhlin, “Determination of elastic constants of generally anisotropic lamellar structure using line-focus acoustic microscopy: Application to Ti-6242 α/β single colony,” Journal of the Acoustical Society of America 126(6), pp. 2998–3007, 2009.
M. Treiber, J.-Y. Kim, L.J. Jacobs, and J. Qu, “Correction for partial reflection in the ultrasonic attenuation measurements using contact transducers,” Journal of the Acoustical Society of America 125(5), pp. 2946–2953, 2009.
C.-W. In, J.-Y. Kim, K.E. Kurtis, and L.J. Jacobs, “Characterization of ultrasonic Rayleigh surface waves in asphalt concrete,” NDT&E International 42, pp. 610–617, 2009.
J. Chen, A. Jayapalan, K.E. Kurtis, J.-Y. Kim, and L. Jacobs, “Ultra-accelerated assessment of alkali-silica reaction in Portland cement mortar with nonlinear ultrasound,” ACI Materials Journal 106(4), pp. 340–348, 2009.
C. Pruell, J.-Y. Kim, J. Qu, and L.J. Jacobs, “Evaluation of fatigue damage using nonlinear Lamb waves,” Smart Materials & Structures 18, 035003, 2009.
J.-Y. Kim and J.-S. Lee, “Extinction cross-section for elastic wave scattering in energy-absorbing media — Revisited,” Acta Mechanica 207, pp. 156–161, 2009.
B.-C. Kim and J.-Y. Kim, “Characterization of ultrasonic properties of concrete,” Mechanics Research Communications 36(2), pp. 207–214, 2009.
B.-C. Kim and J.-Y. Kim, “Effective properties of multi-layered multi-functional composites,” Advanced Composite Materials 18(2), pp. 153–166, 2009.
C. Pruell, J.-Y. Kim, J. Qu, and L.J. Jacobs, “A nonlinear guided wave technique for evaluating plasticity driven material damage in a metal plate,” NDT&E International 43(3), pp. 199–203, 2009.
G. Shui, J.-Y. Kim, J. Qu, Y.S. Wang, and L.J. Jacobs, “A new technique for measuring the acoustic nonlinearity of materials using Rayleigh waves,” NDT&E International 41, pp. 326–329, 2008.
C. Bermes, J.-Y. Kim, J. Qu, and L.J. Jacobs, “Nonlinear Lamb waves for the detection of material nonlinearity,” Mechanical Systems and Signal Processing 22(3), pp. 638–646, 2008.
X.J. Chen, J.-Y. Kim, J. Qu, K.E. Kurtis, S.C. Wu, and L.J. Jacobs, “Characterization of progressive microcracking in Portland cement mortar using nonlinear ultrasonics,” NDT&E International 41(2), pp. 112–118, 2008.
C. Pruell, J.-Y. Kim, J. Qu, and L.J. Jacobs, “Evaluation of plasticity driven material damage using Lamb waves,” Applied Physics Letters 91(23), 231911, 2007.
S.I. Rokhlin, J.-Y. Kim, B. Xie, and B. Zoofan, “Nondestructive sizing and localization of internal micro-cracks in fatigue samples,” NDT&E International 40(6), pp. 462–470, 2007.
J.-Y. Kim and J.-S. Lee, “A micromechanical model for nonlinear acoustic properties of interfaces between solids,” Journal of Applied Physics 101(2), 043501, 2007.
C. Bermes, J.-Y. Kim, J. Qu, and L.J. Jacobs, “Experimental characterization of material nonlinearity using Lamb waves,” Applied Physics Letters 90(2), 021901, 2007.
W. Punurai, J. Jarzynski, J. Qu, J.-Y. Kim, L.J. Jacobs, and K.E. Kurtis, “Characterization of multi-scale porosity in cement paste by advanced ultrasonic techniques,” Cement and Concrete Research 37, pp. 38–46, 2007.
J.-Y. Kim, A. Baltazar, J.W. Hu, and S.I. Rokhlin, “Hysteretic linear and nonlinear acoustic responses from pressed interfaces,” International Journal of Solids and Structures 43(21), pp. 6436–6452, 2006.
J.-Y. Kim, L.J. Jacobs, J. Qu, and J.W. Littles, “Experimental characterization of fatigue damage in a nickel-base superalloy using nonlinear ultrasonic waves,” Journal of the Acoustical Society of America 120(3), pp. 1266–1273, 2006.
B. Zoofan, J.-Y. Kim, S.I. Rokhlin, and G.S. Frankel, “Phase-contrast X-ray imaging for nondestructive evaluation of materials,” Journal of Applied Physics 100(1), 014502, 2006.
J. Herrmann, J.-Y. Kim, L.J. Jacobs, J. Qu, J.W. Littles, and M. Savage, “Assessment of material damage in a nickel-base superalloy using nonlinear Rayleigh surface waves,” Journal of Applied Physics 99(12), 124918, 2006.
J.-Y. Kim, J. Qu, L.J. Jacobs, J.W. Littles, and M. Savage, “Acoustic nonlinearity parameter due to microplasticity,” Journal of Nondestructive Evaluation 25(2), pp. 29–37, 2006.
A. Baltazar, J.-Y. Kim, and S.I. Rokhlin, “Ultrasonic determination of real contact area of randomly rough surfaces in elastoplastic contact,” Revista Mexicana de Física 52(1), pp. 37–47, 2006.
B. Zoofan, J.-Y. Kim, S.I. Rokhlin and G.S. Frankel, “Application of phase-contrast microradiography in NDE (Vol. 62, pg. 1122, 2005),” Materials Evaluation 64(1), p. 25, 2006.
J.-Y. Kim, “Discussion: Boundary Element Analysis of Multiple Scattering Waves in High Performance Concretes,” Journal of Applied Mechanics — Transactions of the ASME 72, p. 982, 2005.
B. Zoofan, J.-Y. Kim, S.I. Rokhlin and G.S. Frankel, “Application of phase-contrast microradiography in NDE,” Materials Evaluation 63(11), pp. 1122–1127, 2005.
J.-Y. Kim, A. Baltazar and S.I. Rokhlin, “Ultrasonic assessment of rough surface contact between solids from elastoplastic loading-unloading hysteresis cycle,” Journal of the Mechanics and Physics of Solids 50, pp. 1911–1934, 2004.
J.-Y. Kim, “On the generalized self-consistent model for elastic wave propagation in composite materials,” International Journal of Solids and Structures 41(16–17), pp. 4349–4360, 2004.
J.-Y. Kim, V. Yakovlev, and S. I. Rokhlin, “Surface acoustic wave modulation on a partially closed fatigue crack,” Journal of the Acoustical Society of America 115(5), pp. 1961–1972, 2004.
J.-Y. Kim and J.-G. Ih, “Scattering of obliquely incident plane acoustic wave by transversely isotropic cylindrical shell — application to material characterization,” Applied Acoustics 64(12), pp. 1187–1204, 2003.
J.-Y. Kim, “Extinction and propagation of elastic waves in inhomogeneous materials,” Mechanics of Materials 35(9), pp. 877–884, 2003.
J.-Y. Kim, “Extinction of elastic wave energy due to scattering in a viscoelastic medium,” International Journal of Solids and Structures 40(17), pp. 4319–4329, 2003.
J.-Y. Kim, V. A. Yakovlev, and S. I. Rokhlin, “Parametric modulation mechanism of surface acoustic wave on a partially closed crack,” Applied Physics Letters 82(19), pp. 3203–3205, 2003.
J.-Y. Kim, “Anti-plane shear wave propagation in fiber-reinforced composites,” Journal of the Acoustical Society of America 113(5), pp. 2442–2445, 2003.
S. I. Rokhlin and J.-Y. Kim, “In-situ ultrasonic monitoring of surface fatigue crack initiation and growth from surface cavity,” International Journal of Fatigue 25, pp. 41–49, 2003.
S. I. Rokhlin and J.-Y. Kim, “In-situ ultrasonic measurement of crack closure,” International Journal of Fatigue 25, pp. 51–58, 2003.
J.-Y. Kim and S. I. Rokhlin, “Surface acoustic wave measurement of small fatigue cracks initiated from a surface cavity,” International Journal of Solids and Structures 39(6), pp. 1487–1504, 2002.
J.-Y. Kim, “Attenuation and speed of antiplane shear wave in fiber-reinforced composites with random interfacial cracks,” International Journal of Solids and Structures 38, pp. 7121–7137, 2001.
J.-Y. Kim, “Effective elastic constants of anisotropic multilayers,” Mechanics Research Communications 28(1), pp. 97–101, 2001.
S. I. Rokhlin, J.-Y. Kim, H. Nagy and B. Zoofan, “Effect of pitting corrosion on fatigue crack initiation and fatigue life,” Engineering Fracture Mechanics 62, pp. 425–444, 1999.
J.-Y. Kim, “Dynamic self-consistent analysis for elastic wave propagation in fiber reinforced composites,” Journal of the Acoustical Society of America 100(4), pp. 2002–2010, 1996.
J.-Y. Kim, J.-G. Ih, and B.-H. Lee, “Dispersion of elastic waves in random particulate composites,” Journal of the Acoustical Society of America 97(3), pp. 1380–1388, 1995.
J.-Y. Kim, J.-G. Ih, and B.-H. Lee, “Dispersive wave propagation in a viscoelastic matrix reinforced by elastic fibers,” Journal of the Acoustical Society of America 95(3), pp. 1213–1222, 1994.
J.-Y. Kim, “Nonlinear resonant vibration of hysteretic materials,” in Volume 3: Nonlinear Acoustics of Solids and Structures, part of the upcoming WSPC Handbook of Nonlinear Dynamics, Vibrations, and Acoustics, Edited by K.H. Matlack, WSPC, Chapter 3, 2027.
J.-Y. Kim, L.J. Jacobs, and J. Qu, “Nonlinear ultrasonic techniques for material characterization,” in Nonlinear Ultrasonic and Vibro-Acoustical Techniques for Nondestructive Evaluation, Edited by T. Kundu, Springer, Chapter 6, 2018. doi:10.1007/978-3-319-94476-0_6
K.H. Matlack, J.-Y. Kim, J.J. Wall, J. Qu, and L.J. Jacobs, “Nonlinear ultrasonic characterization of radiation damage using Charpy impact specimen,” ASTM-STP 1576, pp. 1–17, 2014.
J.-Y. Kim, L. J. Jacobs, and J. Qu, “Material Characterization by Nonlinear Ultrasonic Technique,” in Ultrasonic and Electromagnetic NDE for Structure and Material Characterization, Edited by T. Kundu, CRC Press, Chapter 8, pp. 493–514, 2012 (ISBN: 978-1-4398-3663-7).
R. M. Kmack, K. E Kurtis, L. J. Jacobs, and J.-Y. Kim, “Assessment of air entrainment in fresh cement paste using ultrasonic nondestructive testing,” in Recent Advancement in Concrete Freezing-Thawing (F-T) Durability, ASTM STP-1511, Edited by K. Wang, ASTM International, West Conshohocken, PA, pp. 1–26, 2010 (ISBN: 978-0-8031-3419-5).
S.I. Rokhlin and J.-Y. Kim, “Chapter 5 — Surface Acoustic Wave Characterization of Pitting Corrosion Damage with Fatigue Cracks,” in Nondestructive Materials Characterization — with Application to Aerospace Materials, Edited by N. G. H. Meyendorf, P. B. Nagy and S. I. Rokhlin, Springer, pp. 142–179, Nov. 2004 (ISBN: 3540405178).
K. Sim, B.-C. Kim, N.H. Jin, M.S. Kim, J.-Y. Kim, and K.H. Tae, “A precast girder for bridge structures,” Korean Patent Registration # 10-2010-0029065.
M. Venturiello, J.-Y. Kim, and A. P. Stebner, “Chromatic-aberration-based optical sensing for in-situ working distance measurement,” Patent Registration.
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