scholarly journals Direct Modeling of the Mechanical Strain Influence on Coda Wave Interferometry

2018 ◽  
Vol 123 (4) ◽  
pp. 3160-3177 ◽  
Author(s):  
J. Azzola ◽  
J. Schmittbuhl ◽  
D. Zigone ◽  
V. Magnenet ◽  
F. Masson
Keyword(s):  
Mechanical Strain ◽  
Coda Wave ◽  
Direct Modeling ◽  
Coda Wave Interferometry

scholarly journals Comparison of Experimentally Determined Two-Dimensional Strain Fields and Mapped Ultrasonic Data Processed by Coda Wave Interferometry

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 4023
Author(s):  
Felix Clauß ◽  
Niklas Epple ◽  
Mark Alexander Ahrens ◽  
Ernst Niederleithinger ◽  
Peter Mark
Keyword(s):  
Test Specimen ◽  
Crack Depth ◽  
Mechanical Strain ◽  
Ultrasonic Waves ◽  
Bending Test ◽  
Coda Wave ◽  
Strain Fields ◽  
Zero Crossing ◽  
Ultrasonic Signals ◽  
Coda Wave Interferometry

Due to the high sensitivity of coda waves to the smallest structural alterations such as strain, humidity or temperature changes, ultrasonic waves are a valid means to examine entire structures employing networks of ultrasonic transducers. In order to substantiate this ex ante assessment, the viability of measuring ultrasonic waves as a valid point of reference and inference for structural changes is to be further scrutinized in this work. In order to investigate the influence of mechanical strain on ultrasonic signals, a four-point bending test was carried out on a reinforced concrete beam at Ruhr University Bochum. Thus, measurements collected from a network of selected transducer pairings arranged across the central, shear-free segment of the test specimen, were correlated to their respective strain fields. Detected ultrasonic signals were evaluated employing Coda Wave Interferometry. Such analysis comprised the initial non-cracked state as well as later stages with incremental crack depth and quantity. It was to ascertain that the test specimen can in fact be qualitatively compartmentalized into areas of compression and tension identified via Relative Velocity Changes presented in Attribute Maps. However, since results did not entail a zero crossing, i.e., neither positive nor negative values were to be calculated, only relative changes in this work displayed staggered over the height of the object under test, are discussed. Under the given methodological premises, additional information is currently required to make quantitative assertions regarding this correlation of ultrasonic and strain results. This holds true for the comparability of the ultrasonic and strain results for both non-cracked and even the cracked state.

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.

scholarly journals Frequency selection for coda wave interferometry in concrete structures

Ultrasonics ◽  
2017 ◽  
Vol 80 ◽  
pp. 1-8 ◽  
Author(s):  
Patrik Fröjd ◽  
Peter Ulriksen
Keyword(s):  
Concrete Structures ◽  
Coda Wave ◽  
Frequency Selection ◽  
Selection For ◽  
Coda Wave Interferometry

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

Monitoring the Stress Level of Concrete Structures with CODA Wave Interferometry: Experimental Illustration of an Investigated Zone

2011 ◽  
pp. 233-238 ◽  
Author(s):  
Y. Zhang ◽  
O. Abraham ◽  
A. Le Duff ◽  
B. Lascoup ◽  
V. Tournat ◽  
...  
Keyword(s):  
Stress Level ◽  
Concrete Structures ◽  
Coda Wave ◽  
Coda Wave Interferometry

Coda-Wave Interferometry in Finite Solids: Recovery ofP-to-SConversion Rates in an Elastodynamic Billiard

2003 ◽  
Vol 90 (25) ◽  
Author(s):  
Oleg I. Lobkis ◽  
Richard L. Weaver
Keyword(s):  
Coda Wave ◽  
Coda Wave Interferometry
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