S. Parthibhan,
B. White,
A. Dowgiallo,
and C. Schaal.
Advancement of nondestructive evaluation in space: Vision and experimental payload design.
AIAA SCITECH 2026 forum,
doi: 10.2514/6.2026-0613
M. Green,
F. Alsaffar,
A. Mal,
and C. Schaal.
Effect of material attenuation on lamb wave propagation in a solar cell array.
Proceedings of the 15th international workshop on structural health monitoring (IWSHM),
2025.
K. Davis,
C. Jeong,
and C. Schaal.
Reinforcement learning for Lamb wave-based nondestructive evaluation of plates.
Health monitoring of structural and biological systems XIX,
2025.
doi: 10.1117/12.3051462
J. Enriquez-Barton,
J. Booth,
and C. Schaal.
Evaluation of contact defects in bio-inspired dry adhesives using guided waves.
Health monitoring of structural and biological systems XIX,
2025.
doi: 10.1117/12.3051121
S. Parthibhan,
J. Santiago,
O. Palacios,
and C. Schaal.
Supporting in-space manufacturing via nondestructive evaluation.
Health monitoring of structural and biological systems XIX,
2025.
doi: 10.1117/12.3050556
S. Parthibhan,
O. Palacios,
J. Santiago,
and C. Schaal.
Concept development for in-space inspection of bonded joints using guided waves and thermography.
SciTech 2025 forum,
2025.
doi: 10.2514/6.2025-1984
M. Green,
F. Alsaffar,
A. Mal,
and C. Schaal.
Lamb wave-based inspection of solar cell arrays.
International mechanical engineering congress and exposition (IMECE),
2024.
doi: 10.1115/IMECE2024-145068
F. Alsaffar,
C. Li,
B. Jin,
A. Mal,
and C. Schaal.
Investigation of lamb wave characteristics in composite oriented strand board plates.
In proceedings of the 39th ASC technical conference,
2024.
C. Schaal,
C. Sun,
E. Casillas,
and S. Romero.
Nondestructive evaluation of defects in tendon ducts of post-tensioned concrete bridge girders.
World congress on advances in civil, environmental, & materials research (ACEM24),
2024.
B. Kim,
S. Maharjan,
F. Pranto,
B. Guidio,
C. Schaal,
and C. Jeong.
Convolutional neural network and level-set spectral element method for ultrasonic imaging of delamination cavities in an anisotropic composite structure.
Ultrasonics,
138:
107254,
2024.
doi: 10.1016/j.ultras.2024.107254
C. Schaal,
R. Granados,
M. Barrett,
and K. Davis.
Automated transducer deployment for Lamb wave-based nondestructive evaluation of plates.
Health monitoring of structural and biological systems XVIII,
2024.
doi: 10.1117/12.3009829
F. Alsaffar,
L. Wang,
A. Mal,
and C. Schaal.
Guided Waves in Pipes Versus Lamb Waves in Plates - A Convergence Analysis.
50th annual review of progress in quantitative nondestructive evaluation,
2023.
doi: 10.1115/QNDE2022-98270
C. Schaal,
C. Kühl,
J. Vural,
and P. Zinkewich.
Automated nondestructive testing of composites using air-coupled guided ultrasound.
Health monitoring of structural and biological systems XVII,
2023.
doi: 10.1117/12.2658014
C. Schaal,
M. Chow,
P. Logozzo,
N. Shirajian,
and S. Tai.
On detecting regional inhomogeneity in composite plates using Lamb waves.
Health monitoring of structural and biological systems XVII,
2023.
doi: 10.1117/12.2657344
E. Hong,
and C. Schaal.
Robotic platforms and robots for nondestructive testing applications, including their production and use.
2023.
S. Lloyd,
C. Schaal,
and C. Jeong.
Inverse modeling and experimental validation for reconstructing wave sources on a 2D solid from surficial measurement.
Ultrasonics,
128:
106880,
2023.
doi: 10.1016/j.ultras.2022.106880
F. Alsaffar,
L. Wang,
A. Mal,
and C. Schaal.
Guided Waves in Pipes Versus Lamb Waves in Plates - A Convergence Analysis.
49th annual review of progress in quantitative nondestructive evaluation,
2022.
7.
doi: 10.1115/QNDE2022-98270
M. Costa,
and C. Schaal.
Guided ultrasound inspection of small features using a horn-type transducer design.
Experimental Mechanics,
1-12,
2022.
doi: 10.1007/s11340-022-00915-w
L. Araque,
L. Wang,
A. Mal,
and C. Schaal.
Advanced fuzzy arithmetic for material characterization of composites using guided ultrasonic waves.
Mechanical Systems and Signal Processing,
171:
108856,
2022.
doi: 10.1016/j.ymssp.2022.108856
C. Schaal,
A. Miranda,
K. Yanik,
and R. Granados.
Recent advancements on autonomous Lamb wave-based nondestructive inspection.
Health monitoring of structural and biological systems XVI,
2022.
doi: 10.1117/12.2613463
C. Schaal,
and D. Upadhyay.
Visualization and analysis of the scattering of high-intensity focused ultrasound at bone phantoms.
Health monitoring of structural and biological systems XVI,
2022.
doi: 10.1117/12.2612964
L. Wang,
L. Araque,
S. Tai,
A. Mal,
and C. Schaal.
Features of Guided Waves Propagating in a Honeycomb Sandwich Structure.
2021 48th annual review of progress in quantitative nondestructive evaluation,
2021.
7.
doi: 10.1115/QNDE2021-75053
C. Gonzales,
A. Balyan,
M. Mallari,
and C. Schaal.
Lamb wave-based nondestructive inspection using a mobile robotic platform.
Health monitoring of structural and biological systems XV,
2021.
doi: 10.1117/12.2583865
D. Upadhyay,
and C. Schaal.
Iterative learning control for high-intensity focused ultrasound treatments.
Health monitoring of structural and biological systems XV,
2021.
doi: 10.1117/12.2583539
L. Araque,
L. Wang,
A. Mal,
and C. Schaal.
Inverse fuzzy arithmetic for material characterization of composites using guided waves.
Health monitoring of structural and biological systems XV,
2021.
doi: 10.1117/12.2583947
A. Miranda,
J. Hook,
and C. Schaal.
Lamb wave-based mapping of plate structures via frontier exploration.
Ultrasonics,
110:
106282,
2021.
doi: 10.1016/j.ultras.2020.106282
D. Sanford,
and C. Schaal.
High-intensity focused ultrasound scattering at mammal vertebrae.
Proceedings of the ASME international mechanical engineering congress and exposition – IMECE 2020,
2020.
M. Brown,
M. Safisamghabadi,
D. Sanford,
and C. Schaal.
Shadowgraph visualization of the scattering of focused ultrasonic waves at bone-like constructs.
Experimental Mechanics,
60:
861-872,
2020.
doi: 10.1007/s11340-020-00609-1
S. Tai,
F. Kotobuki,
A. Mal,
and C. Schaal.
Numerical and experimental investigation of damage detection in stiffened composite panels using guided ultrasonic waves.
Health monitoring of structural and biological systems IX,
2020.
doi: 10.1117/12.2558845
L. Araque,
L. Wang,
S. Tai,
A. Mal,
and C. Schaal.
Uncertainty characterization of guided ultrasonic wave properties in composite materials.
Health monitoring of structural and biological systems IX,
2020.
doi: 10.1117/12.2558853
D. Upadhyay,
and C. Schaal.
Optimizing the driving trajectories for guided ultrasonic wave excitation using iterative learning control.
Mechanical Systems and Signal Processing,
144:
106876,
2020.
doi: 10.1016/j.ymssp.2020.106876
A. Miranda,
C. Gonzales,
A. Balyan,
and C. Schaal.
Mobile robotic platform for inspecting aircraft surfaces using lamb waves.
Proceedings of the 12th international workshop on structural health monitoring (IWSHM),
2019.
L. Wang,
L. Araque,
S. Tai,
A. Mal,
and C. Schaal.
Feasibility analysis of various sensing methods for nondestructive testing of composites.
Proceedings of the 12th international workshop on structural health monitoring – IWSHM,
2019.
D. Upadhyay,
and C. Schaal.
Ringing suppression for ultrasonic nondestructive testing using iterative learning control and h-infinity synthesis.
Proceedings of the 12th international workshop on structural health monitoring – IWSHM,
2019.
S. Tai,
L. Wang,
L. Araque,
A. Mal,
and C. Schaal.
Effects of homogenization and quasi-isotropy assumptions on guided wave-based nondestructive testing methods.
Proceedings of the 12th international workshop on structural health monitoring – IWSHM,
2019.
M. Brown,
D. Sanford,
and C. Schaal.
Imaging of the scattering of high-intensity focused ultrasonic waves at artificial bone replicas.
Mechanics of biological systems and materials & micro-and nanomechanics, volume 4,
2020.
doi: 10.1007/978-3-030-30013-5
C. Schaal,
M. Brown,
and K. Schulz.
Experimental investigation of lamb wave-based edge detection methods.
Proc. SPIE,
10972:
1097223-1097223-11,
2019.
doi: 10.1117/12.2515452
C. Schaal,
and V. Durgesh.
Investigation of the scattering of focused ultrasonic waves at bones.
Proceedings of the ASME international mechanical engineering congress and exposition – IMECE 2018,
2018.
doi: 10.1115/IMECE2018-87133
E. Hong,
and C. Schaal.
Reverse engineering stiffened plates using guided wave-based nondestructive testing methods.
Proc. SPIE,
10600:
10600-10600-9,
2018.
doi: 10.1117/12.2296745
M. Brown,
M. Safisamghabadi,
C. Schaal,
and V. Durgesh.
Visualization of the scattering of focused ultrasonic waves at solid-fluid interfaces.
Proc. SPIE,
10600:
10600-10600-10,
2018.
doi: 10.1117/12.2296744
C. Schaal,
R. M’Closkey,
and A. Mal.
Semi-analytical modeling of anchor loss in plate-mounted resonators.
Ultrasonics,
82:
304-312,
2018.
doi: 10.1016/j.ultras.2017.09.009
C. Schaal,
and A. Mal.
Core-skin disbond detection in a composite sandwich panel using guided ultrasonic waves.
Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems,
1(1):
011006,
2017.
doi: 10.1115/1.4037544
C. Schaal,
S. Tai,
and A. Mal.
On the assumption of transverse isotropy of a honeycomb sandwich panel for NDT applications.
Proc. SPIE,
10170:
1017022-1017022-8,
2017.
doi: 10.1117/12.2260092
C. Schaal,
R. M’Closkey,
and A. Mal.
Parametric studies for semi-analytical investigation of plate-mounted resonators.
Proc. SPIE,
10170:
101700O-101700O-10,
2017.
doi: 10.1117/12.2262002
L. Maio,
F. Ricci,
V. Memmolo,
N. Boffa,
E. Monaco,
A. Mal,
and C. Schaal.
Laser doppler velocimetry and PZT sensing for the study of guided waves in a stepped aluminum plate.
Proc. SPIE,
10170:
101701S-101701S-15,
2017.
doi: 10.1117/12.2260140
C. Schaal,
S. Zhang,
H. Samajder,
and A. Mal.
An analytical study of the scattering of ultrasonic guided waves at a delamination-like discontinuity in a plate.
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science,
1-14,
2017.
doi: 10.1177/0954406217700176
C. Schaal,
and A. Mal.
Lamb wave propagation in a plate with step discontinuities.
Wave Motion,
66:
177-189,
2016.
doi: 10.1016/j.wavemoti.2016.06.012
C. Schaal,
S. Bischoff,
and L. Gaul.
Damage detection in multi-wire cables using guided ultrasonic waves.
Structural Health Monitoring,
15(3):
279-288,
2016.
doi: 10.1177/1475921716647249
C. Schaal,
and A. Mal.
Guided waves in a plate with a delamination-like discontinuity.
Proceedings of the ASME international mechanical engineering congress and exposition – IMECE 2016,
2016.
doi: 10.1115/IMECE2016-68193
C. Schaal,
A. Mal,
and R. M’Closkey.
Semi-analytical modeling of substrate loss of miniature resonators.
Proceedings of the 24th international congress of theoretical and applied mechanics – ICTAM 2016,
2016.
C. Schaal,
A. Mal,
and R. M’Closkey.
A semi-analytical method for calculating resonator energy loss into plate substrates.
2016 IEEE international symposium on inertial sensors and systems,
2016.
2.
doi: 10.1109/ISISS.2016.7435534
H. Baid,
C. Schaal,
H. Samajder,
and A. Mal.
Dispersion of lamb waves in a honeycomb composite sandwich panel.
Ultrasonics,
56(0):
409-416,
2015.
doi: 10.1016/j.ultras.2014.09.007
C. Schaal,
S. Bischoff,
and L. Gaul.
Energy-based models for guided ultrasonic wave propagation in multi-wire cables.
International Journal of Solids and Structures,
64-65:
22-29,
2015.
doi: 10.1016/j.ijsolstr.2015.03.010
C. Schaal,
H. Samajder,
H. Baid,
and A. Mal.
Rayleigh to lamb wave conversion at a delamination-like crack.
Journal of Sound and Vibration,
353(0):
150-163,
2015.
doi: 10.1016/j.jsv.2015.05.016
L. Gaul,
C. Schaal,
and S. Bischoff.
Crack detection in overhead transmission lines by ultrasonic waves.
Proceedings of international conference on structural engineering dynamics – ICEDyn,
2015.
C. Schaal,
S. Zhang,
H. Samajder,
and A. Mal.
Analytical investigation of the interaction of rayleigh and lamb waves at a delamination-like discontinuity in a thick plate.
Proceedings of the 10th international workshop on structural health monitoring – IWSHM,
2015.
doi: 10.12783/SHM2015/225
C. Schaal,
X. Cao,
and A. Mal.
The influence of stiffeners on the propagation of guided ultrasonic waves.
Proceedings of the 10th international workshop on structural health monitoring – IWSHM,
2015.
doi: 10.12783/SHM2015/248
C. Schaal,
and A. Mal.
Dispersion of guided waves in composite laminates and sandwich panels.
Proc. SPIE,
9438:
94380L-1-94380L-12,
2015.
doi: 10.1117/12.2083870
C. Schaal.
Fuzzy arithmetical assessment of health monitoring for multi-wire cables using ultrasonic waves.
Der Andere Verlag,
2014.
S. Bischoff,
C. Schaal,
and L. Gaul.
Efficient wave scattering analysis for damaged cylindrical waveguides.
Journal of Sound and Vibration,
333(18):
4203-4213,
2014.
doi: 10.1016/j.jsv.2014.04.013
C. Schaal,
and M. Hanss.
Uncertainty analysis for crack detection in cylindrical waveguides.
PAMM,
14(1):
695-696,
2014.
doi: 10.1002/pamm.201410330
C. Schaal,
and L. Gaul.
Crack detection in multi-wire cables using guided ultrasonic waves.
EWSHM - 7th european workshop on structural health monitoring,
2014.
C. Schaal,
S. Bischoff,
and L. Gaul.
Analysis of wave propagation in periodic 3D waveguides.
Mechanical Systems and Signal Processing,
40(2):
691-700,
2013.
doi: 10.1016/j.ymssp.2013.06.021
C. Schaal,
and M. Hanss.
Uncertainty analysis for damaged multi-wire cables.
Safety, reliability, risk and life-cycle performance of structures and infrastructures: Proceedings of ICOSSAR 2013,
1601-1607.
2014.
C. Schaal,
and M. Hanss.
Fuzzy arithmetical assessment of wave propagation models for multi-wire cables.
Special topics in structural dynamics, volume 6,
177-185.
2013.
doi: 10.1007/978-1-4614-6546-1 18
L. Gaul,
H. Sprenger,
C. Schaal,
and S. Bischoff.
Structural health monitoring of cylindrical structures using guided ultrasonic waves.
Acta Mechanica,
223:
1669-1680,
2012.
doi: 10.1007/s00707-012-0634-z
C. Schaal,
M. Krautter,
and M. Hanss.
Dispersion in cylindrical waveguides with uncertain parameters.
PAMM,
12(1):
537-538,
2012.
doi: 10.1002/pamm.201210257
N. Higgins,
and C. Schaal.
Inter-wire coupling model development for health monitoring of cable structures.
PAMM,
12(1):
543-544,
2012.
doi: 10.1002/pamm.201210260
C. Schaal,
and M. Hanss.
Modeling wave propagation in coupled waveguides with uncertain parameters.
Proceedings of ISMA2012–USD2012,
2012.
C. Schaal,
and M. Hanss.
Qualitätsbewertung von modellen mittels unsicherheitsanalysen für die wellengestützte strukturüberwachung.
Fortschritte der akustik,
2011.
S. Engelke,
C. Schaal,
and L. Gaul.
Model identification for a modal state estimator from output-only data.
Structural dynamics, volume 3: Proceedings of the 28th IMAC, a conference on structural dynamics, 2010,
1305-1312.
2011.
S. Engelke,
C. Schaal,
and L. Gaul.
Beobachterentwurf zur schätzung von strukturschwingungen auf der basis einer output-only modalanalyse.
Schwingungsanalyse & identifikation,
363-371.
2010.