A parallel between earthquake sequences and acoustic emissions released during fracture process in reinforced concrete structures under flexural loading

Sagar, R. Vidya

doi:10.1016/j.conbuildmat.2016.03.082

Cited by 30 publications

(7 citation statements)

References 30 publications

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“…AE signals refer to elastic waves whose energy attenuates from high order to low order, which are generated due to the internal damage of materials and obtained by sensors attached to the surface of materials [20]. The number of AE signals obtained in the monitoring process is related to material properties, damage process and intensity [16]. Meanwhile, the value of AE characteristic parameters depends on the intensity of local damage.…”

Section: Acoustic Emission Methodsmentioning

confidence: 99%

“…Previous studies have shown that the AE generated by solid fracture is similar to the propagation mode of seismic waves. In reference to the Gutenberg-Richter empirical relation in seismology, the b-value method can be adopted to analyze AE data [16]. Siracusano et al [17] established the damage assessment system of fiber-free concrete by Hilbert-Huang Transform processing of AE data, verifying the role of AE technology in the monitoring and health assessment of infrastructure service status.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties and Crack Classification of Basalt Fiber RPC Based on Acoustic Emission Parameters

Liu

Zhou

et al. 2019

Applied Sciences

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The workability and mechanical properties of basalt fiber reactive powder concrete (BFRPC) were investigated by univariate analysis. The acoustic emission (AE) was used as a non-destructive technique to reveal the damage characterization of concrete samples of varying basalt fiber content. The fracture stages and modes of specimens during flexural test were determined by AE parameters. The content of silica fume, quartz sand and basalt fiber of 0.4, 1.3 and 10 kg/m3, respectively, was found related to optimal improvements in mechanical strength. As for the characteristics of fracture, it was found that the fiber content was a significant determinant, and the key AE parameters, namely, hits, energy and amplitude, were found related to the damage stage of specimens. Furthermore, rise time (RA) and average frequency (AF) were found to have opposite trends during loading while their variation related to the fracture modes of BFRPC.

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Section: Acoustic Emission Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Crack Classification of Basalt Fiber RPC Based on Acoustic Emission Parameters

Liu

Zhou

et al. 2019

Applied Sciences

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“…A reduction in b -value has been observed a few weeks before an earthquake, as well as before failure of a building structure. 35–37 As in seismology, b -values vary with respect to the load, material, and fracture toughness. However, b -values exhibit a decreasing trend near the failure of healthy specimens.…”

Section: Methodsmentioning

confidence: 99%

“…For these reasons, the b -value is used for earthquakes 29–31 and rocks, 38,39 while the I b -value is used for concrete structures. 35–37…”

Section: Methodsmentioning

confidence: 99%

Effect of propagation distance on acoustic emission of carbon fiber/epoxy composites

Jung

Lee

et al. 2021

Structural Health Monitoring

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This study examined the change in acoustic emission as a function of measurement position of fiber-reinforced composites. Single-edge-notched carbon fiber/epoxy composites were prepared and tested under cyclic loading, with sensors located at specific distances from the end of the notch. Although the I b-value increased overall, the degree of increase significantly varied with position and acoustic emission frequency. Notably, the proportion of acoustic emission signals for each failure mode varied due to a high attenuation rate at high frequencies, which increased the I b-value. Accordingly, the high-frequency fiber-failure signals significantly affected the I b-value. This study focused on the importance of analyzing acoustic emission signals by considering the crack location and frequency-dependent attenuation rate. We concluded that an acoustic emission sensor should be located 20–40 mm from the crack location for woven carbon fiber/epoxy composites.

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“…Experiments with AE tests and fracture mechanics were conducted to correlate damage analysis or energy in structures [30][31][32]. In addition, acoustic emission and digital image correlation techniques were simultaneously used to investigate fracture parameters such as crack opening and size of fracture zone.…”

Section: Relationship Of Fracture Mechanics and Acoustic Emission Tesmentioning

confidence: 99%

Monitoring Damage Using Acoustic Emission Source Location and Computational Geometry in Reinforced Concrete Beams

2018

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Non-destructive testing in reinforced concrete (RC) for damage detection is still limited to date. In monitoring the damage in RC, 18 beam specimens with varying water cement ratios and reinforcements were casted and tested using a four-point bending test. Repeated step loads were designed and at each step load acoustic emission (AE) signals were recorded and processed to obtain the acoustic emission source location (AESL). Computational geometry using a convex hull algorithm was used to determine the maximum volume formed by the AESL inside the concrete beam in relation to the load applied. The convex hull volume (CHV) showed good relation to the damage encountered until 60% of the ultimate load at the midspan was reached, where compression in the concrete occurred. The changes in CHV from 20 to 40% and 20 to 60% load were five and 13 times from CHV of 20% load for all beams, respectively. This indicated that the analysis in three dimensions using CHV was sensitive to damage. In addition, a high water-cement ratio exhibited higher CHV formation compared to a lower water-cement ratio due to its ductility where the movement of AESL becomes wider.

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A parallel between earthquake sequences and acoustic emissions released during fracture process in reinforced concrete structures under flexural loading

Cited by 30 publications

References 30 publications

Mechanical Properties and Crack Classification of Basalt Fiber RPC Based on Acoustic Emission Parameters

Mechanical Properties and Crack Classification of Basalt Fiber RPC Based on Acoustic Emission Parameters

Effect of propagation distance on acoustic emission of carbon fiber/epoxy composites

Monitoring Damage Using Acoustic Emission Source Location and Computational Geometry in Reinforced Concrete Beams

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