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Acoustic emission

About: Acoustic emission is a research topic. Over the lifetime, 16293 publications have been published within this topic receiving 211456 citations.


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TL;DR: In this article, the influence of the radial stress gradient on strainbursts of granite was investigated using an improved true-triaxial rockburst testing system, which was equipped with an acoustic emission monitoring system.
Abstract: Strainbursts, which are violent disasters that are accompanied by the ejection failure of rocks, usually occur in hard brittle rocks around highly stressed underground openings. The release of the radial stress at excavation boundaries is one of the major inducing factors for strainbursts in tunnels. After excavation, the radial stress usually exhibits different but apparent gradient variations along the radial direction near the boundary within a certain depth under different in situ stress conditions. In this study, the influence of the radial stress gradient on strainbursts of granite was investigated using an improved true-triaxial rockburst testing system, which was equipped with an acoustic emission monitoring system. The stress state and boundary conditions (i.e., one face free, other faces loaded and increasing tangential stress) of the representative rock element in the vicinity of the excavation boundary were simulated. High-speed cameras were used to capture the ejection failure processes during strainbursts, and the kinetic energy of ejected fragments was quantitatively estimated by analyzing the recorded videos. The experimental results indicate that with an increasing radial stress gradient, the strength increases, the apparent yield platform prior to the peak stress on the stress–strain curves decreases, the failure mode changes from strainburst characterized by tensile splitting to strainburst characterized by shear rupture, and the kinetic energy of ejected fragments during strainbursts significantly increases.

65 citations

Journal ArticleDOI
Keru Wu1, Bing Chen1, Wu Yao1
TL;DR: In this article, acoustic emission (AE) signals from mortar, concrete and steel fiber reinforced concrete beams during the entire fracture process were recorded and analyzed, and the relationship between the AE signal section and the failure mechanism of these materials, analyzed on the meso-structure level was determined.

65 citations

Journal ArticleDOI
TL;DR: In this paper, the acoustic emission (AE) signal and deformation process in AM60 magnesium alloy were investigated using transmission electron and light microscopy techniques, and it was shown that the AE response is associated with various modes of mechanical twinning at lower temperatures, whereas at higher temperatures also the influence of ǫ+ǫ-a-non-basal dislocations on AE response must be taken into account.

65 citations

Journal ArticleDOI
TL;DR: The experimental results show that Locadiff achieved to detect and locate the cracking zones in the core of the concrete beam at an early stage by mapping the changes in the concrete's micro-structure and monitor the internal stress level in both temporal and spatial domains by mapped the variation in velocity caused by the acousto-elastic effect.
Abstract: This paper describes the use of an ultrasonic imaging technique (Locadiff) for the Non-Destructive Testing & Evaluation of a concrete structure. By combining coda wave interferometry and a sensitivity kernel for diffuse waves, Locadiff can monitor the elastic and structural properties of a heterogeneous material with a high sensitivity, and can map changes of these properties over time when a perturbation occurs in the bulk of the material. The applicability of the technique to life-size concrete structures is demonstrated through the monitoring of a 15-ton reinforced concrete beam subject to a four-point bending test causing cracking. The experimental results show that Locadiff achieved to (1) detect and locate the cracking zones in the core of the concrete beam at an early stage by mapping the changes in the concrete's micro-structure; (2) monitor the internal stress level in both temporal and spatial domains by mapping the variation in velocity caused by the acousto-elastic effect. The mechanical behavior of the concrete structure is also studied using conventional techniques such as acoustic emission, vibrating wire extensometers, and digital image correlation. The performances of the Locadiff technique in the detection of early stage cracking are assessed and discussed.

65 citations

Journal ArticleDOI
TL;DR: In this paper, damage evolution in glass/carbon fiber hybrid composites with various stacking sequences is investigated under pure bending and tensile loading conditions, and the hybrid effect and ratio is calculated for all laminates.

65 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023701
20221,350
2021832
2020841
2019918
2018763