Slow-dynamical nonlinearity in a glass bead pack probed with diffuse ultrasound and coda-wave interferometry

2019 ◽  
Vol 145 (3) ◽  
pp. 1756-1756
Author(s):  
Richard Weaver ◽  
John Y. Yoritomo ◽  
John Popovics ◽  
James Bittner
Keyword(s):  
Glass Bead ◽  
Coda Wave ◽  
Coda Wave Interferometry ◽  
Diffuse Ultrasound

scholarly journals Characterizing mechanical change in metals using amplitude-modulated diffuse ultrasound

2020 ◽  
Vol 19 (6) ◽  
pp. 1894-1904
Author(s):  
Fan Xie ◽  
Yuxiang Zhang ◽  
Eric Larose ◽  
Aroune Duclos ◽  
Su Chen ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Early Stage ◽  
Ultrasonic Method ◽  
Excitation Amplitude ◽  
Coda Wave ◽  
Metallic Materials ◽  
Velocity Change ◽  
Coda Wave Interferometry ◽  
Mechanical Change ◽  
Diffuse Ultrasound

In this article, we present an ultrasonic method based on diffuse ultrasound with successive excitation amplitudes. This method provides amplitude-dependent parameters of diffuse ultrasound using coda wave interferometry, and these parameters can be used to characterize mechanical change in metallic materials. The localized mechanical change caused by an instantaneous 400°C thermal shock in a meter-scale aluminum alloy slab was characterized by measuring the diffuse-wave velocity change and decorrelation coefficient as functions of the excitation amplitude. The potential mechanisms and spatial distribution that cause the observed amplitude-dependent diffuse waveform modification are discussed. Combining the method presented here with complementary approaches will enhance the ability to nondestructively detect early-stage damage in the laboratory or in the field.

Monitoring medium changes in an intraplate setting with coda wave interferometry

2013 ◽  
Author(s):  
Virginie D'Hour ◽  
Aderson F. do Nascimento ◽  
Heleno C. de Lima Neto ◽  
Joaquim M. Ferreira ◽  
Martin Schimmel
Keyword(s):  
Coda Wave ◽  
Coda Wave Interferometry

scholarly journals Sensitivity of Ultrasonic Coda Wave Interferometry to Material Damage—Observations from a Virtual Concrete Lab

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4033
Author(s):  
Claudia Finger ◽  
Leslie Saydak ◽  
Giao Vu ◽  
Jithender J. Timothy ◽  
Günther Meschke ◽  
...  
Keyword(s):  
Elastic Moduli ◽  
Concrete Specimen ◽  
Coda Wave ◽  
Velocity Change ◽  
Damage Scenarios ◽  
Different Types ◽  
Source Signal ◽  
The Impact ◽  
Structural Scale ◽  
Coda Wave Interferometry

Ultrasonic measurements are used in civil engineering for structural health monitoring of concrete infrastructures. The late portion of the ultrasonic wavefield, the coda, is sensitive to small changes in the elastic moduli of the material. Coda Wave Interferometry (CWI) correlates these small changes in the coda with the wavefield recorded in intact, or unperturbed, concrete specimen to reveal the amount of velocity change that occurred. CWI has the potential to detect localized damages and global velocity reductions alike. In this study, the sensitivity of CWI to different types of concrete mesostructures and their damage levels is investigated numerically. Realistic numerical concrete models of concrete specimen are generated, and damage evolution is simulated using the discrete element method. In the virtual concrete lab, the simulated ultrasonic wavefield is propagated from one transducer using a realistic source signal and recorded at a second transducer. Different damage scenarios reveal a different slope in the decorrelation of waveforms with the observed reduction in velocities in the material. Finally, the impact and possible generalizations of the findings are discussed, and recommendations are given for a potential application of CWI in concrete at structural scale.

Monitoring cleaning cycles of fouled ducts using ultrasonic coda wave interferometry (CWI)

Ultrasonics ◽  
2019 ◽  
Vol 96 ◽  
pp. 253-260 ◽  
Author(s):  
B. Chen ◽  
D. Callens ◽  
P. Campistron ◽  
E. Moulin ◽  
P. Debreyne ◽  
...  
Keyword(s):  
Coda Wave ◽  
Coda Wave Interferometry

Using Ultrasonic Coda Wave Interferometry for Monitoring Stress‐Induced Changes in Concrete

2010 ◽  
Author(s):  
Parisa Shokouhi ◽  
Ernst Niederleithinger ◽  
Andreas Zoëga ◽  
Andreas Barner ◽  
Dieter Schöne
Keyword(s):  
Coda Wave ◽  
Induced Changes ◽  
Coda Wave Interferometry
Sign in / Sign up

Export Citation Format

Share Document