This investigation studies the behavior of surface wave velocity in concrete specimens subjected to low levels of compressive and tensile stress in beams from applied flexural loads. Beam specimen is loaded in a 4-point-load bending configuration, generating uniaxial compression and tension stress fields at the top and bottom surfaces of the beam, respectively. Surface waves are generated through contactless air-coupled transducers and received through contact accelerometers. Results show a clear distinction in responses from compression and tension zones, where velocity increases in the former and decreases in the latter, with increasing load levels. These trends agree with existing acoustoelastic literature. Surface wave velocity tends to decrease more under tension than it tends to increase under compression, for equal load levels. It is observed that even at low stress levels, surface wave velocity is affected by acoustoelastic effects, coupled with plastic effects (stress-induced damage). The acoustoelastic effect is isolated by means of considering the Kaiser effect and by experimentally mitigating the viscoelastic effects of concrete. Results of this ongoing investigation contribute to the overall knowledge of the acoustoelastic behavior of concrete. Applications of this knowledge may include structural health monitoring of members under flexural loads, improved high order modelling of materials, and validation of results seen in dynamic acoustoelasticity testing.
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16 February 2017
43RD ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLUME 36
17–22 July 2016
Atlanta, Georgia, USA
Research Article|
February 16 2017
The stress-induced surface wave velocity variations in concrete
Agustin Spalvier;
Agustin Spalvier
a)
1
Universidad de la República
, Julio Herrera y Reissig 565, Montevideo, Uruguay
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James Bittner;
James Bittner
b)
2
University of Illinois at Urbana-Champaign
, 205 N Mathews, Newmark Civil Engineering Laboratory, Urbana, IL 61801, USA
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Sai Kalyan Evani;
Sai Kalyan Evani
c)
2
University of Illinois at Urbana-Champaign
, 205 N Mathews, Newmark Civil Engineering Laboratory, Urbana, IL 61801, USA
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John S. Popovics
John S. Popovics
d)
2
University of Illinois at Urbana-Champaign
, 205 N Mathews, Newmark Civil Engineering Laboratory, Urbana, IL 61801, USA
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a)
Corresponding author: [email protected]
AIP Conf. Proc. 1806, 080010 (2017)
Citation
Agustin Spalvier, James Bittner, Sai Kalyan Evani, John S. Popovics; The stress-induced surface wave velocity variations in concrete. AIP Conf. Proc. 16 February 2017; 1806 (1): 080010. https://doi.org/10.1063/1.4974635
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